STAR HardProbes PWG

[Yuanjing Ji <jiyj AT rcf.rhic.bnl.gov>]

Dear convenors,

I would like to draw your attention that the updated NPE v2 note, paper 
as well as the responses to convenors' comments have been sent to PWG 
for more than two weeks. I am wondering do you have any further comments 
on the low-energy NPE v2 paper and note?

Thanks,
Best
Yuanjing


On 2022-05-10 16:42, Yuanjing Ji via Star-hf-l wrote:
> Dear convenors,
>
> Again, thank you for your valuable comments. We have updated our
> notes/paper draft and prepared responses to your comments. Please find
> the details below. We would like to get your sign-off and move on to
> GPC.
>
> Paper draft:
> https://drupal.star.bnl.gov/STAR/system/files/Heavy_Flavor_Electron_v2_at_27_and_54_4_Au_Au_Collisions_May10.pdf
>
> Note:
> https://drupal.star.bnl.gov/STAR/system/files/NPE_v2_at_Au_Au_27_and_54_4_GeV_analysis_note_May10.pdf
>
> Website: https://www.star.bnl.gov/protected/heavy/jiyj/NPEweb
>
> Response to convenors:
> Comments to Note:
> response to Sooraj:
> https://drupal.star.bnl.gov/STAR/system/files/Sooraj_NPE_v2_note_May10.pdf
> response to Barbara:
> https://drupal.star.bnl.gov/STAR/system/files/Barbara_NPE_v2_note_May10.pdf
> response to Yi:
> https://drupal.star.bnl.gov/STAR/system/files/Yang_NPE_v2_note_May10.pdf
> Comments to Paper:
> response to Barbara:
> https://drupal.star.bnl.gov/STAR/system/files/Barbara_NPE_v2_paper_May10.pdf
> response to Yi:
> https://drupal.star.bnl.gov/STAR/system/files/Yi_yang_NPE_v2_paper_May10.pdf
>
> Best
> Yuanjing
>
> On 2021-07-01 21:22, Sooraj Radhakrishnan wrote:
> > Dear Yuanjing,
> >    Sorry for the late reply on this. Please find some comments from me
> > on the nicely prepared analysis note below
> >
> > L 37: if constructing --> for reconstructing
> > Fig 1. Do you also have a plot of the pT correlation of the electron
> > and parent HF hadron? Would be good to see what the parent pT the pT_e
> > > 1.2 GeV/c correspond to
> > Fig 4b. Do you have a similar plot for 27 GeV?
> > L 55: is nToFMatch same as TOF multiplicity?
> > L 112: What does the primary track requirement have in addition to DCA
> > cut?
> > Fig 7: For the merged pions, are these the selected sample? It doesnt
> > seem to correspond to the band in Fig.6b. How can by selecting on
> > large nSigma_pi a merged pion pure sample be selected at higher pT
> > where TOF PID is not so clean?
> > Fig 8: Can you include the PID fits for other pT regions in the
> > appendix?
> > L 148: What about overlap regions with K, merged pi or proton?
> > L 149: Are these checks only for regions with significant pi overlap?
> > Fig 9.a What eta range is this for?
> > Eq 8 Is there any energy dependence for the spectra to be taken here
> > as the data are for 39 and 62.4 GeV?
> > Eq 11: Could you specify the low and high pT regions for the input
> > gamma spectra from data or p+p scaled?
> > Fig 15: There doesnt seem to be a smooth continuation between the low
> > pT scaling and the high pT pQCD regions. And there is energy
> > dependence for the pQCD part. How is this accomodated in the
> > weighting?
> >
> > L 202: What are the eta weights taken for the parent particle
> > distributions? Are they taken to be flat? Is there any systematic
> > checks on efficiency determination done from this?
> > L 209: why is this factor needed? There is already normalization for
> > pT and by number of parent particles. Is this different for different
> > sources?
> > Fig 54, 55: What are the partner electron pT in these figures? Is it
> > all pT?
> > Fig 54-56: Are these for 54.4 GeV? could you specify? Can the 27 GeV
> > plots also be added for completion?
> > Fig 18: Could you add a brief description describing how the error
> > bands shown is obtained?
> > Eq 13: I am a bit confused here. Shouldnt you just multiply the
> > efficiency with a correction factor Rcut,MC/Rcut,data, where Rcut is
> > the fraction of normalized counts from a cut? Wouldnt this account for
> > the shape difference between data and MC in the efficiency
> > calculation?
> >
> > L 232, 233: typos in comparison symbols
> >
> > Fig 21: How does this impact the efficiency calculation? There is a
> > momentum shift depending on the conversion vertex position, should
> > this be taken into account in the efficiency calculation?
> >
> > L 240: Could you have a small separate paragraph/section for the Ke3
> > --> e contribution? Why is it discussed together with efficiency? The
> > 30% and 10% quoted are fractions of eHF?
> >
> > Fig 24: What are the systematic uncertainties shown here? Is this the
> > combined uncertainty from phe efficiency and purity calculations?
> >
> > L 246-252: Many typos in comparison symbols, please fix
> >
> > Fig 26b: Why are the 27 GeV values not shown? Could this be added?
> >
> > Fig 27a: Is the recentering and flattening done in small centrality
> > bins or for the 0-60% centrality? Will this introduce any bias? Can
> > the inclusive v2 be checked for EP flattened in 5% and 0-60%
> > centrality bins?
> >
> > L 258 and other places: reconstructed electrons --> reconstructed
> > photonic electrons
> >
> > L 274: A scaling looking at BES energy dependence for v2 should let
> > you extrapolate to the 54.4 Gev from 62.4 GeV, isnt? or similar for 27
> > GeV
> >
> > L 285: This paragraph is not clear. Why do you need to flatten the
> > input phi distribution? You are sampling from a distribution, the
> > statistical fluctuations should be kept for a meaningful statistical
> > uncertainties on your final calculated phe v2 values. Do you have a
> > plot showing the impact of this weight on the evaluated phe v2?
> >
> > Eq 33: So with this, the v2 is calculated for different partner pT
> > values? What is the x-axis in Fig 34?
> >
> > After Eq 33: Do you have a figure describing this reweighting? What is
> > F_reco a function of? pT? May be Im confused here a bit, what is the
> > distinction between reconstructed electron and photonic electron here?
> >
> >
> > Eq 34: What are the number of points here referring to? Is this for
> > the uncertainty in the scale factor c? What are data and sim values
> > referring to here? This part might need a bit more expansion and
> > figures.
> >
> > Eq 38: subscript should be sys in the second equation
> >
> > L 308: What makes the phe v2 uncertainties largest? This was as
> > mentioned above not quite clear as to what goes into the estimation
> >
> > L 319+: many comparison symbol typo
> >
> > L 341: Fig reference missing
> >
> > Fig 43: What is the reason for the double peaked structure of the ke3
> > fractions? Arent the quality cuts pT independent?
> >
> > Fig 46: This was discussed before I guess, only the full range
> > calculation makes sense for v2. If you use only the near side range,
> > then by definition, v2 vales will be different.
> >
> > L 412+ Again many symbol typos, please fix
> >
> > L 465: Is the low pT difference not significant? what could cause this
> > difference?
> >
> > thanks
> >
> > Sooraj
> >
> > On Fri, Jun 18, 2021 at 12:59 PM Yuanjing Ji <jiyj AT rcf.rhic.bnl.gov>
> > wrote:
> >
> > > Hi Barbara and Yi,
> > >
> > > Thank you for the very nice comments. I will send the updated
> > > version
> > > once I address all the comments.
> > >
> > > Best
> > > Yuanjing
> > >
> > > On 2021-06-17 12:30, Barbara Trzeciak wrote:
> > > > Hi Yuanjing,
> > > > please find my comment to the paper draft below.
> > > >
> > > > Cheers,
> > > > Barbara
> > > >
> > > > Paper draft comments:
> > > >
> > > > - abstract:
> > > >
> > > > - Heavy flavor electron (e HF ) v2 in Au+Au √sNN = 54.4 GeV
> > > > collisions -> Heavy flavor electron (e HF ) v2 in Au+Au collisions
> > > at
> > > > √sNN = 54.4 GeV
> > > >
> > > > -  of 200 GeV -> at √sNN = 200 GeV
> > > >
> > > > - "their parent charm hadron v2" - but you consider here D
> > > mesons
> > > > only not B ?
> > > >
> > > > - The measured e HF v2 in 54.4 GeV -> The measured e HF v2 at
> > > 54.4
> > > > GeV
> > > >
> > > > - thermal equilibrium in Au+Au 54.4 GeV collisions - >thermal
> > > > equilibrium in Au+Au collisions at √ sNN = 54.4 GeV
> > > >
> > > > - in Au+Au √sNN = 27 GeV -> in Au+Au collisions at √sNN = 27
> > > GeV
> > > > - This indicates a hint -> This hints
> > > >
> > > > - "The energy dependence of particle v2 reveals the quark mass
> > > > hierarchy in the process of thermalization in high-energy nuclear
> > > > collisions" - This statement might be too strong. It's hard to say
> > > if
> > > > we can conclude so based on HF results in fig. 8 that have large
> > > > uncertainties. Please also see my comments to the AN regarding
> > > this.
> > > > - Figures: on some figures you have "Au+Au Collisions 0-60%" in
> > > other
> > > > "Au+Au 0-60%" or "Au+Au Collisions" - please unify this among all
> > > the
> > > > figures
> > > >
> > > > - L3: theory to describe strong interaction in laboratory ->
> > > theory
> > > > that describes strong interactions
> > > >
> > > > - L8: you cite here RHIC papers only [1,2], while in the text you
> > > also
> > > > mention LHC.
> > > >
> > > > - L8: of current heavy ion experiments -> of the current heavy ion
> > > > experiments
> > > >
> > > > - L14: comparable to larger -> comparable or larger
> > > >
> > > > - L20: There are quite significant experimental achievements on
> > > the
> > > > charm hadron elliptic flow (v2) [7, 8, 9] and nuclear modification
> > > > factor (RAA) measurements -> There are many experimental results
> > > on
> > > > the charm hadron elliptic flow (v2) [7,9,9] and nuclear
> > > modification
> > > > factor (RAA)  [10, 11, 12, 13]
> > > >
> > > > - L22: at top RHIC -> at the top RHIC
> > > >
> > > > - L24: with the -> in the
> > > >
> > > > - L25: are coupled with the QGP medium strongly -> are strongly
> > > > coupled with the QGP medium
> > > >
> > > > - L26: using the single electrons from heavy flavor decays ->
> > > using
> > > > single electrons from open-charm and -bottom hadron decays
> > > >
> > > > - L27: show -> provide
> > > >
> > > > - L27: there are also ATLAS resutls on muons from HF decays in
> > > Pb+Pb
> > > > at 5.02 TeV: https://doi.org/10.1016/j.physletb.2020.135595 [1]
> > > [2]
> > > > - L30: at critical temperature region -> around the critical
> > > > temperature
> > > >
> > > > - L33: for heavy flavor program will be focusing on further -> of
> > > > heavy flavor program is to further
> > > >
> > > > - L34: remove "uncertainty"
> > > >
> > > > - L 36: RHIC top energy region will offer -> RHIC top energy
> > > offers
> > > > - L37: this QGP transport parameter. -> the QGP transport
> > > parameter,
> > > > D_s.
> > > >
> > > > - L28: Previously RHIC experiments have conducted  -> Previously,
> > > RHIC
> > > > experiments conducted
> > > >
> > > > - L40: contained large uncertainties statistically and
> > > systematically
> > > > -> have large statistically and systematically uncertainties
> > > >
> > > > - L41: such that one cannot -> therefore one cannot
> > > >
> > > > - L46: used in the analysis -> utilized in this analysis
> > > >
> > > > - L52: used in the analysis for tracking -> used for tracking
> > > >
> > > > - L55: for -> of
> > > >
> > > > - L56: The data sample statistics -> The statistics of the data
> > > sample
> > > > - L63: require -> is required
> > > >
> > > > - L65-66: converted in high detector material density area ->
> > > > converted in areas of high detector material density
> > > >
> > > > - L67: Electron tracks are first selected by -> Electron are
> > > > identified using
> > > >
> > > > - L69: and required -> and are required
> > > >
> > > > - L74: electron samples -> electrons
> > > >
> > > > - L75: and PID cuts -> and particle identification (PID) cuts
> > > >
> > > > - L75: called as -> called
> > > >
> > > > - L77-78: Merged pion happens when TPC cannot seperate two pion
> > > tracks
> > > > due to finite resolution -> Merged pions is a sample of two pion
> > > > tracks that cannot by separated due to the finite resolution of
> > > TPC.
> > > > - Fig.1 caption: (Plot(a) depicts the dE/dx distribution of the
> > > tracks
> > > > that pass TOF PID -> (a) dE/dx distribution of tracks that pass
> > > TOF
> > > > PID
> > > >
> > > > The purity of inclusive electron samples after both dE/dx and TOF
> > > PID
> > > > cuts is shown in plot(b). -> (b): purity of the inclusive electron
> > > > sample after both dE/dx and TOF PID in Au+Au collisions at √ sNN
> > > =
> > > > 54 GeV. The gray band represents systematic uncertainties.
> > > >
> > > > - Fig.1a: a suggestion, it might be more useful to show an example
> > > > projection of nSigmaE with a multi-gaussian fit
> > > >
> > > > - L82: are used -> is used
> > > >
> > > > - L83: electrons candidates -> electron candidates
> > > >
> > > > - L83: add that nSigmaE projections are done in narrow momentum
> > > bins
> > > > - L84: the ratio of electron yields -> a ratio of the electron
> > > yield
> > > > - L84: over the integrated yields -> over the yield
> > > >
> > > > - L85: within nσe cuts -> within the analysis nσe cut
> > > >
> > > > - L88: crossover with electron -> cross with the electron
> > > >
> > > > - L89: momentum range -> momentum ranges - give also approximate
> > > > values of these ranges
> > > >
> > > > - L89: the significant drop of electron purity -> a significant
> > > drop
> > > > of electron purity, as can be seen in Fig. 1(b).
> > > >
> > > > - L90: into systematic -> in the shown systematic
> > > >
> > > > - L92: description for -> description of
> > > >
> > > > - L93: remove -> exclude from the further analysis
> > > >
> > > > - L94: range within -> ranges of
> > > >
> > > > - Fig. 2 caption: Photonic electron partner pT (a) -> (a) Photonic
> > > > electron partner pT - same for (b) and (c)
> > > >
> > > > - L97: decay -> decays
> > > >
> > > > - L102: Tracks from inclusive electrons -> Inclusive electron
> > > tracks
> > > > - L103: called as tagged electron -> called tagged electrons
> > > >
> > > > - L104: electrons -> electrons
> > > >
> > > > - L108: are called as reconstruction -> are called reconstructed
> > > >
> > > > - L109: backgrounds of this method are estimated ->  background is
> > > > estimated
> > > >
> > > > - L110: yields are -> yield is
> > > >
> > > > - L113-114:  is the e^pho reconstruction efficiency defined as the
> > > > estimated e^reco yield over Npho . \epsilon^reco is determined by
> > > > track quality cuts on partner electron and -> is the photonic
> > > electron
> > > > reconstruction efficiency that takes into account track quality
> > > cuts
> > > > applied on the partner electron and
> > > >
> > > > - L115: reconstruction cuts -> the reconstruction cuts
> > > >
> > > > - Fig. 2: please move it closer to the place in the text where you
> > > > describe it
> > > >
> > > > - L117: STAR detector -> the STAR detector
> > > >
> > > > - L117: photon -> photons
> > > >
> > > > - L119: in Au+Au 39 and 62.4 GeV collisions -> in Au+Au collisions
> > > at
> > > > √ sNN =  39 and 62.4 GeV
> > > >
> > > > - L119-120: eta spectra is -> The \eta spectra are
> > > >
> > > > - L122: as the real -> as in the real
> > > >
> > > > - L123: of partner -> of the partner
> > > >
> > > > - L124:  tagged -> the tagged
> > > >
> > > > - L124: Au+Au 54.4 GeV collisions -> Au+Au collisions at  √ sNN
> > > =
> > > > 54.4 GeV
> > > >
> > > > - L127: TPC inner field cage -> the TPC inner field cage
> > > >
> > > > - L128: shows a good description of data -> described the data
> > > well.
> > > > - L129: electrons contributed by Dalitz decay and photon
> > > conversion in
> > > > the total -> the electron contribution from the Dalitz decays and
> > > the
> > > > photon conversions to the total
> > > >
> > > > - L131: mainly contributed by -> mostly from
> > > >
> > > > - L133: efficiency are -> efficiency is
> > > >
> > > > - L134: black data point -> black points
> > > >
> > > > - L137: are shown -> is shown
> > > >
> > > > - L137-138:  Because the drop of charm hadrons production cross
> > > > section as the decrease of energy is faster than those of light
> > > > hadrons, -> Because the charm hadron production cross section
> > > drops
> > > > faster with the decreasing collision energy than the light hadron
> > > > production cross section,
> > > >
> > > > - L141: here you write about the reaction plane, but later you
> > > write
> > > > that you use event plane. Should be added that event plane is an
> > > > estimation for the reaction plane in an experiment.
> > > >
> > > > - L144: with opposite η sign of the electron -> in opposite η
> > > region
> > > > of the detector than the electron candidate
> > > >
> > > > - L145: are applied -> is applied
> > > >
> > > > - L147:  event plane -> the  event plane
> > > >
> > > > - L148: would be good what is the value of the resolution.
> > > >
> > > > - L150: as -> as used for the
> > > >
> > > > - Fig. 3 caption:  (a): The relative fraction of electrons from
> > > > various sources in the photonic electron sample, including: Dalitz
> > > > decay ...
> > > >
> > > > "Photonic electrons are consisted with various ingredients
> > > including"-
> > > > remove
> > > >
> > > > The total photonic electron reconstruction efficiency is shown as
> > > the
> > > > solid points in panel (a) -> (b) The total photonic electron
> > > > reconstruction efficiency shown as the solid points
> > > >
> > > > - Fig. 4 caption: refer to bands and data points using they style
> > > not
> > > > colors. The same comment to other figures.
> > > >
> > > > GeV collisions -> GeV
> > > >
> > > > - Fig. 5: use different area styles for the red and blue bands
> > > >
> > > > y-axis title: Electron Anisotropy -> v_2
> > > >
> > > > - L155-159: it's not clear from the text what is the reconstructed
> > > > electron v2, why you show it and why you discuss uncertainties on
> > > it,
> > > > as what you need is the photonic electron v2. It's also not clear
> > > how
> > > > do you obtain the unc. on the photonic electron v2. Please make
> > > this
> > > > part more clear for a reader.
> > > >
> > > > - L161: inclusive electrons and their -> the inclusive electron
> > > sample
> > > > and the hadron
> > > >
> > > > - L164: are estimated  by-> is estimated using
> > > >
> > > > - L165: simulation -> simulations
> > > >
> > > > - L165: TPC tracking efficiency are -> the TPC tracking efficiency
> > > is
> > > > - L168: spectra is -> spectrum is
> > > >
> > > > - L168: Au+Au 62.4 GeV -> Au+Au collisions at  √ sNN = 62.4 GeV
> > > >
> > > > - You don't comment on the kaon contribution at 27 GeV
> > > >
> > > > - L180: are the multiplicity -> is the multiplicity
> > > >
> > > > - L180: event plane -> the event plane
> > > >
> > > > - L185-205: you don't discuss results below 1.2 GeV/c, it would be
> > > > good to have some observations about the low pT part in this
> > > paragraph
> > > > as well.
> > > >
> > > > - L186:  27, 54.4 ->  27 and 54.4 GeV
> > > >
> > > > - L187:  and 200 GeV ->  and at  √ sNN = 200 GeV
> > > >
> > > > - L189: in 54.4 GeV -> for 54.4 GeV
> > > >
> > > > - L190: contains much improved precision both statistically and
> > > > systematically -> are more precise, both in terms of statistical
> > > and
> > > > systematic uncertainties.
> > > >
> > > > - L195: in 54.4 GeV ->  at  √ sNN =  54.4 GeV
> > > >
> > > > - L196: so strongly with the QGP medium that they may also have
> > > > reached -> strongly with the QGP medium and may reach
> > > >
> > > > - L198: "although the collision energy is nearly a factor of 4
> > > lower"
> > > > - I think it's better to give an estimate of the difference in the
> > > > initial energy density for the two energies.
> > > >
> > > > - L201-202: ".. at temperature region close to the critical
> > > > temperature. " - not sure if this statement is correct.  By
> > > critical
> > > > temperature you refer to which exactly temperature ?
> > > >
> > > > - Fig. 7 at 54.4 GeV collisions -> in Au+Au collisions at √ sNN
> > > =
> > > > 54.4 GeV
> > > >
> > > > - L211: "elastic collisional scatterings should dominate" - add
> > > some
> > > > references to this statement
> > > >
> > > > - L211: this low pT region that is covered in this analysis ->
> > > this
> > > > the pT region covered by this analysis
> > > >
> > > > -Fig. 6 caption: 54.4 (black points) and 27 (green points) GeV ->
> > > 54.4
> > > > GeV (black points) and 27 GeV (green points). black points ->
> > > full
> > > > circles, same for other points.
> > > >
> > > > - L226: comparable -> consistent
> > > >
> > > > - L228: centroid of data points -> measured central values
> > > >
> > > > - L231:  is often different -> differ
> > > >
> > > > - L232-233: To have a fair comparison between the charm hadron v2
> > > with
> > > > identified particles v2 -> In order to compare v2 of charm hadrons
> > > > with the identified particle v2
> > > >
> > > > - L236: calculate -> simulate
> > > >
> > > > - L237: follow the number-of-constituent-quark,  (mT − m0)/nq,
> > > > scaling
> > > >
> > > > - L238: as far as I understand, you use preliminary results for
> > > light
> > > > hadron v2 at 54 GeV. I think these results are now in GPC, so it
> > > would
> > > > be good to use the updated results here, once they are published.
> > > > Something to keep in mind for later.
> > > >
> > > > - L240: with that of e^HF from data -> with the measured e^HF v2
> > > >
> > > > - L241: which is corresponding -> , that corresponds
> > > >
> > > > - L242: have obtained -> obtain
> > > >
> > > > - L242-243:  in Au+Au 54.4 GeV collisions. It suggests that the
> > > charm
> > > > quark may be close -> and maybe be close
> > > >
> > > > - L244:  at Au+Au √ sNN = 54.4 GeV ->  in Au+Au collisions at
> > > √
> > > > sNN = 54.4 GeV
> > > >
> > > > - L249: at 7.7-200 GeV -> at  √ sNN = 7.7-200 GeV
> > > >
> > > > - L250, 251:  at 2.76 TeV ->  at √ sNN = 2.76 TeV
> > > >
> > > > - L250-252: e HF and φ v2 at 2.76 TeV are lack of minimum bias
> > > > measurements and scaled to 0 − 60% centrality by eccentricity
> > > [57]
> > > > ->  Since there are no minimum bias measurements of e HF and φ v2
> > > in
> > > > Pb+Pb collisions at √ sNN = 2.76 TeV, the results in narrower
> > > > centrality ranges [ref] are scaled to 0 − 60% centrality by
> > > > eccentricity [57].
> > > >
> > > > - L253: "while become much smaller at low energies" - this needs
> > > to be
> > > > quantified, within the uncertainties it's not so much smaller -
> > > please
> > > > also see comments to the AN regarding this. Also, D0 point is only
> > > for
> > > > 200 GeV.
> > > >
> > > > - L255: "With decreasing collision energy, ..." - please see
> > > comments
> > > > on this statement in other places.
> > > >
> > > > - Fig. 8 doesn't have K as described in the text. Also, the phi
> > > > results that you showed during the coll. meeting looked more
> > > precise
> > > > and further from pi v2 than the results on fig. 8. What has
> > > changed ?
> > > > The D0 point overlaps with the HFe point, I don't think it's
> > > necessary
> > > > there, or maybe shift it a bit more. Please also see comments to
> > > the
> > > > AN on this results.
> > > >
> > > > - Fig. 8: y-axis title, remove "@ <kT> .. .", add information
> > > about
> > > > <kT> on the plot
> > > >
> > > > - L261: in Au+Au 27 GeV collisions  -> in Au+Au collisions at  √
> > > sNN
> > > > =  27 GeV
> > > >
> > > > - L262: while e HF in 54.4 GeV collisions shows a significant
> > > non-zero
> > > > v2 -> while at  √ sNN =  54.4 GeV a significant non-zero v2 is
> > > > observed for pT < 2 GeV/c.
> > > >
> > > > - L263: to that of -> to that at
> > > >
> > > > - L264: "Several transport model calculations under predict the
> > > > measured .." - isn't the discrepancy below pT of 1 GeV/c and above
> > > > there's agreement ?
> > > >
> > > > - L268:  can still gain ->  gain
> > > >
> > > > - L269: the evolution of the QCD medium -> the interactions with
> > > the
> > > > expanding QCD medium
> > > >
> > > > - L270: Au+Au 54.4 GeV collisions as well -> Au+Au collisions at
> > > √
> > > > sNN =   54.4 GeV
> > > >
> > > > - L271:  new constraints to the ->  further constraints on the
> > > >
> > > > - L271-272: reference to this sentence would be useful
> > > >
> > > > - L272-273: "We observe clear ...as the decrease of collisions
> > > > energies." - this sentence might be too strong, comments as above
> > > and
> > > > to the AN.
> > > >
> > > > - L274-275: this sentence is quite generic and doesn't seem to
> > > bring
> > > > much. Either add some argument why, mention what is still expected
> > > to
> > > > come and at what energies, etc., or remove this sentence.
> > > >
> > > > On Thu, Jun 17, 2021 at 9:33 AM Yi Yang <yiyang AT ncku.edu.tw>
> > > wrote:
> > > > > Dear Yuanjing,
> > > > >
> > > > > I have some comments and suggestions for your consideration on
> > > your
> > > > > nice paper draft.
> > > > >
> > > > > - General: all symbols, like e^{pho}, N^{NPE}, N_{Inc} ...,
> > > please
> > > > > use romain font for the superscripts. For example, e^{\rm pho},
> > > > > N^{\rm NPE}
> > > > >
> > > > > - Title: Heavy Flavor --> Heavy-Flavor
> > > > > - Abstract: it would be nice to mention STAR here.
> > > > > Heavy flavor electron --> Heavy-flavor electrons
> > > > > exhibit --> exhibits
> > > > > with the expectation that their parent charm
> > > > > hadron v_2 follows number-...  --> with the expectation of their
> > > > > parent charm hadron v_2 following number-...
> > > > > The measured e^HF v_2 in Au+Au sqrt(s_NN) = 27 GeV
> > > > > -->  The measured e^HF v_2 at sqrt(s_NN) = 27 GeV
> > > > > -L2: Heavy ion --> Heavy-ion
> > > > > -L3: to describe strong interaction in laboratory, --> to
> > > describe
> > > > > strong interaction, in laboratory,
> > > > > -L7: , namely the Quark-Gluon Plasma (QGP) had been --> , namely
> > > > > the Quark-Gluon Plasma (QGP), had been
> > > > > -L7: heavy ion collisions --> heavy-ion collisions
> > > > > -L8: heavy ion experiments --> heavy-ion experiments
> > > > > -L10: Heavy flavor quarks --> Heavy-flavor quarks
> > > > > -L11: large masses --> heavy masses
> > > > > -L12: Heavy flavor quarks --> Heavy-flavor
> > > > > -L13: heavy ion collisions --> heavy-ion collisions
> > > > > -L14: larger than --> longer than
> > > > > -L16: Heavy quark --> Heavy-flavor quarks
> > > > > -L18: heavy quark --> Heavy-flavor quark
> > > > > -L20: There are quite significant experimental achievements -->
> > > > > There are quite a lot of experimental achievements  (?)
> > > > > -L22: at top RHIC energy --> at the top RHIC energy
> > > > > -L23: at high transverse momentum p_T --> at high p_T
> > > > > -L26: heavy flavor decays --> heavy-flavor hadron decays
> > > > > -L33: heavy flavor program --> heavy-flavor program
> > > > > -L35: (mu_B) etc. --> (mu_B), etc.
> > > > > -L35: heavy quark --> Heavy-flavor quark
> > > > > -L38: Previously RHIC experiments --> Previous RHIC experiments
> > > > > -L54: 35cm --> 35 cm
> > > > > -L54: Totally, 5.7 x 10^8 ... --> Total 5.7 x 10^8 ...
> > > > > -L55: The data sample statistics used here is more than --> The
> > > > > statistics of these data sample is more than
> > > > > -L58: Add reference of the previous STAR measurement
> > > > > -L65: to suppress photon decayed electrons converted in high
> > > > > detector material density area --> to suppress the electrons from
> > > > > the photon conversion at high detector material density area.
> > > (?)
> > > > > -L68: path-length --> path length
> > > > > -L68: time-of-flight --> time of flight
> > > > > -L71: pass 1/beta cuts are --> passed 1/beta cuts is
> > > > > -L75: PID cuts --< particle identification (PID) requirements
> > > > > -L75: called --> categorized (?)
> > > > > -L77: proton and so called merged pions --> proton, and ``merged
> > > > > pions''
> > > > > -L78: finite resolution --> finite spatial resolution
> > > > > -Figure 1: (Plot(a) depicts the dE/dx ... pass TOF PID --> (a)
> > > The
> > > > > dE/dx   ... passed TOF PID
> > > > > The purity of ... PID cuts is shown in plot (b)
> > > > > --> (b) The purity of .... PID cuts as a function of p_T
> > > > > -L83: pass 1/beta cuts --> passed 1/beta cuts
> > > > > -L88: , kaon and proton dE/dx bands crossover --> the dE/dx band
> > > > > for kaon and proton crossover
> > > > > -L90: into systematic uncertainty --> into the systematic
> > > > > uncertainty
> > > > > -L91: It would be good to elaborate more on "the selection of
> > > pion
> > > > > samples".
> > > > > -L95: Please explain why the systematic uncertainty is
> > > > > out-of-control in these regions.
> > > > > -L96: heavy flavor electrons --> heavy-flavor electrons (e^{\rm
> > > > > HF})
> > > > > -L99: N^{NPE} = p x N^{Inc} + N^{pho}  --> N^{NPE} = p x N^{Inc}
> > > -
> > > > > N^{pho}
> > > > > -L104: A tagged electrons --> A tagged electron
> > > > > -L105: as photonic electron candidate --> as the photonic
> > > electron
> > > > > candidate
> > > > > -L105: di-electron passes --> dielectron pair passed
> > > > > -L112: pass reconstruction -->passed reconstruction
> > > > > -L113: \epsilon^{reco} is the e^{pho} reconstruction efficiency
> > > > > defined as the estimated e^{reco} yield over N^{\pho}.
> > > > > \epsilon^{reco} is determined by ...   -->  \epsilon^{reco} is
> > > the
> > > > > e^{pho} reconstruction efficiency and is determined by ...
> > > > > ("defined as the estimated e^{reco} yield over N^{\pho}"
> > > > > reads a bit strange to me.)
> > > > > -L120: shape of --> shapes of
> > > > > -L122: Fig. 2 shows --> Figure 2 (a) - (c) show
> > > > > -L124: pair-DCA and decay-length distribution --> pair-DCA, and
> > > > > decay-length distributions
> > > > > -L125: electron 0.4 < p_T < 2.5 GeV/c --> electron with 0.4 < p_T
> > > > > < 2.5 GeV/c
> > > > > -L128:, respectively. The simulation... --> , respectively, and
> > > > > they can be well described by the simulation.
> > > > > -L128: Fig 3 (a) depict --> Figure 3 (a) depicts
> > > > > -L130: in total photonic electrons --> to the total photonic
> > > > > electrons
> > > > > -L132: in the TPC inner field cage (TPC-IFC) --> in the TPC-IFC
> > > > > -L133: dominated --> dominant
> > > > > -L133: The estimated e^{pho} reconstruction efficiency are -->
> > > The
> > > > > estimated reconstruction efficiency for e^{pho} is
> > > > > -L134: Reconstruction efficiency for --> Reconstruction
> > > > > efficiencies from
> > > > > -L136: 54.4 and 200  --> 54.4, and 200
> > > > > -L142: add a reference for the v2 definition
> > > > > -L147: azimuth angle --> azimuthal angle
> > > > > -L147: Please describe how to evaluate the event plane resolution
> > > > > or give a reference.
> > > > > -L151: Due to lack of --> Due to the lack of
> > > > > -Figure 3: are consisted with --> are consisted of
> > > > > solid points in panel (a) --> solid points in
> > > > > panel (b)
> > > > > from different sources. --> from different
> > > > > sources: Green is pi^0/eta --> e (green), gamma --> e from
> > > TPC-IFC
> > > > > (magenta), and gamma --> e from other (red).
> > > > > -Figure 4: 54.4 (blue) and 27 (green) --> 54.4 (blue), and 27
> > > > > (green)
> > > > > -Figure 5: The blue data points --> The black data points
> > > > > -L157: the blue points --> the black points
> > > > > -L158: the pink band --> the red band
> > > > > -L166: that satisfy --> and satisfy
> > > > > -L166: add a reference for PYTHIA
> > > > > -L167: B=0.5 T --> B = 0.5 T
> > > > > -L169: The input heavy flavor electron --> The input e^{\rm HF}
> > > > > -L170: add a reference for FONLL
> > > > > -L171: please define N_coll
> > > > > -L173: in inclusive electron --in the inclusive electron sample
> > > > > -L176: from from PYTHIA --> from PYTHIA
> > > > > -L178: sum for --> sum over
> > > > > -L179: an average --> the average
> > > > > -L183: upper-limit --> upper limit
> > > > > -L185: v_2 of heavy flavor electrons (e^HF) --> v_2 of e^{\rm HF}
> > > > > -L187: and 200 GeV from previous publication --> and the previous
> > > > > 200 GeV publication
> > > > > -L187: The blue hatched --> The gray hatched
> > > > > -L190: at similar collision energies [14, 23] --> at similar
> > > > > collision energies, 200 and 62.4 GeV [14, 23]
> > > > > -L191: much improved --> better
> > > > > -L192: are sizable --> is sizable
> > > > > -L193: at 1.2 < p_T < 2 GeV/c --> within 1.2 < p_T < 2 GeV/c
> > > > > -L198: although --> even though
> > > > > -L199: to sqrt{s_NN} = 200 GeV  --> to 200 GeV
> > > > > -L204: although --> however
> > > > > -L206: experiment results --> experimental results
> > > > > -L208: PHSD --> PHSD (parton-hadron string dynamics)
> > > > > -L211: that is covered --> where is covered
> > > > > -L218: In the PHSD (parton-hadron string dynamics) model  --> In
> > > > > the PHSD model
> > > > > -Figure 6: Heavy flavor electron --> Heavy-flavor electron
> > > > > to previous data --> to the previous measurement
> > > > > -Figure 7: compare with TAMU, and PHSD calculations --> compared
> > > > > to the TAMU and PHSD calculations
> > > > > -L222: PHSD model --> The PHSD model
> > > > > -L235: The PYTHIA decayer generator --> The PYTHIA generator
> > > > > -L237: follow the (m_T - m_0)/n_q scaling  --> follow the
> > > > > number-of-constituent-quark  (NCQ) scaling, (m_T - m_0)/n_q,
> > > where
> > > > > m_T is ..., m_0 is... , and n_q is ...  (or give a reference), to
> > > > > those of light hadrons ...
> > > > > -L243: to those of light hadrons in Au+Au 54.4 GeV collisions. It
> > > > > suggests that the charm quark ... -->  to those of light hadrons
> > > > > and the charm quark
> > > > > -L246: D^0 and e^HF --> D^0, and e^HF
> > > > > -L248: phi and D^0 --> phi, and D^0
> > > > > -L252: D^0 and e^HF --> D^0, and e^HF
> > > > > -Figure 8: D^0 and heavy flavor electron e^HF --> D^0, and e^HF
> > > > > are statistical and systematic errors combined
> > > > > --> are combined statistical and systematic uncertainties.
> > > > > -L264: under predict --> underestimate
> > > > > -L267: number-of-constituent-quark scaling --> NCQ scaling
> > > > > -L274: interesting --> important (?)
> > > > > -L275: and LHC. --> and the LHC.
> > > > >
> > > > > Reference:
> > > > > - all et al. should be {\it et al.}
> > > > > - all (STAR) or (PHENIX) should be (STAR Collaboration) or
> > > > > (PHENIX Collaboration)
> > > > > - all issue numbers should be in bold, for example  Phys. Rev. C
> > > > > 71 (2005) --> Phys. Rev. C {\bf 71) (2005)
> > > > >
> > > > > -L379: de/dx calibration of the star tpc --> dE/dx calibration of
> > > > > the STAR TPC
> > > > > -L386: A. Adare, S. Afanasiev ... --> A. Adare et al. (PHENIX
> > > > > Collaboration)
> > > > > -L392: author = ???  Move authors to the beginning
> > > > > -L400: A. Adare, S. Afanasiev ... --> A. Adare et al. (PHENIX
> > > > > Collaboration)
> > > > > -L427: A. Adare, S. Afanasiev ... --> A. Adare et al. (PHENIX
> > > > > Collaboration)
> > > > > -L439: S(NN)**(1/2)  looks strange ,  200-GeV --> 200 GeV
> > > > > -L442: gev au-au collisions --> GeV Au-Au collisions
> > > > > -L463: 083c01 ???
> > > > >
> > > > > Cheers,
> > > > > Yi
> > > > >
> > > > > +++++++++++++++++++++++++++++++++++++++++++++++++++
> > > > > Yi Yang, Associate Professor
> > > > > Department of Physics
> > > > > National Cheng Kung University
> > > > > Tainan, 701 Taiwan
> > > > > E-Mail: yiyang AT ncku.edu.tw
> > > > > Tel: +886-6-2757575 ext.65237
> > > > > Fax: +886-6-2747995
> > > > > Group Web: http://phys.ncku.edu.tw/~yiyang [2] [1]
> > > > > +++++++++++++++++++++++++++++++++++++++++++++++++++
> > > > >
> > > > > On Fri, Jun 11, 2021 at 2:19 AM Yuanjing Ji
> > > <jiyj AT rcf.rhic.bnl.gov>
> > > > > wrote:
> > > > >
> > > > > > Dear convenors and all,
> > > > > >
> > > > > > Here is a gentle reminder. The NPE v2 at 54.4 and 27 GeV paper
> > > > > > draft has
> > > > > > been ready for PWG review for about two weeks.
> > > > > >
> > > > > > The website is located at:
> > > > > > https://www.star.bnl.gov/protected/heavy/jiyj/NPEweb
> > > > > > The links to the paper draft, analysis note, past presentations
> > > > > > are all
> > > > > > included on the website.
> > > > > >
> > > > > > Direct link to the paper draft can be found at:
> > https://drupal.star.bnl.gov/STAR/system/files/HFE_v2_at_27_and_54_4_Au_Au_Collisions_v1.pdf
> > > > > > Direct link to the analysis note can be found at:
> > https://drupal.star.bnl.gov/STAR/system/files/NPE_v2_27_54_note_v1.pdf
> > > > > > Your comments and suggestions are highly welcome.
> > > > > >
> > > > > > Regards,
> > > > > > Yuanjing for PAs
> > > > > >
> > > > > > On 2021-05-28 11:20, Yuanjing Ji via Star-hf-l wrote:
> > > > > > > Hi all,
> > > > > > >
> > > > > > > Please find the first paper draft for Heavy flavor electron v2
> > > > > > at 27
> > > > > > > and 54 GeV at:
> > https://drupal.star.bnl.gov/STAR/system/files/HFE_v2_at_27_and_54_4_Au_Au_Collisions_v1.pdf
> > > > > > > The analysis note:
> > https://drupal.star.bnl.gov/STAR/system/files/NPE_v2_27_54_note_v1.pdf
> > > > > > > The website:
> > > > > > > https://www.star.bnl.gov/protected/heavy/jiyj/NPEweb
> > > > > > >
> > > > > > > Comments and suggestions are highly welcome.
> > > > > > >
> > > > > > > Best
> > > > > > > Yuanjing
> > > > > > > _______________________________________________
> > > > > > > Star-hf-l mailing list
> > > > > > > Star-hf-l AT lists.bnl.gov
> > > > > > > https://lists.bnl.gov/mailman/listinfo/star-hf-l
> > > >
> > > >
> > > > Links:
> > > > ------
> > > > [1]
> > https://urldefense.com/v3/__http://phys.ncku.edu.tw/*yiyang__;fg!!P4SdNyxKAPE!R8oGSQDkKyRP8Nr3lKLpwz-g4GQ3pLDDq4jojdWDyyU5Od3KAgiWnTvqPDwWtXyhfd7UCw$
> > > > [2]
> > https://urldefense.com/v3/__https://doi.org/10.1016/j.physletb.2020.135595__;!!P4SdNyxKAPE!R8oGSQDkKyRP8Nr3lKLpwz-g4GQ3pLDDq4jojdWDyyU5Od3KAgiWnTvqPDwWtXwmrY0RGw$
> >
> > --
> >
> > Sooraj Radhakrishnan
> >
> > Research Scientist,
> > Department of Physics
> >
> > Kent State University
> >  Kent, OH 44243
> >
> > Physicist Postdoctoral AffiliateNuclear Science Division
> > Lawrence Berkeley National Lab
> > MS70R0319, One Cyclotron Road
> > Berkeley, CA 94720
> > Ph: 510-495-2473 [3]
> >
> > Email: skradhakrishnan AT lbl.gov
> >
> >
> > Links:
> > ------
> > [1] 
> > https://urldefense.com/v3/__https://doi.org/10.1016/j.physletb.2020.135595__;!!P4SdNyxKAPE!SHoPUkAroUXpplM9UoZS7T-vBuDFWwcVfvEj6qYQuQDFVyJa_6vJIFsNaZdWueqQc0VW2w$
> > [2] 
> > https://urldefense.com/v3/__http://phys.ncku.edu.tw/*yiyang__;fg!!P4SdNyxKAPE!SHoPUkAroUXpplM9UoZS7T-vBuDFWwcVfvEj6qYQuQDFVyJa_6vJIFsNaZdWueowX1H0RA$
> > [3] tel:%28510%29%20495-2473
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