STAR Flow, Chirality and Vorticity PWG

[Sooraj Radhakrishnan <skradhakrishnan AT lbl.gov>]

Hi Rishabh,

   Thanks for the updates and the comparison plots

Could you also show the comparison to proton results? 

And also for 14.6 GeV for completeness?

//We observe an agreement with mass number scaling within ~10% for v3 of 

light nuclei.//

---- Where do you get this number from? Similar to the case of v2, you can take the ratio and see whats the level of agreement. Since the ratio seems mostly flat, you could fit a constant and also get the uncertainty on it. This should tell us that (if) the scaling observed for v3 is not from limited precision 

S17: You dont have to add a slide here. Just pointing to other talks/posters with light nuclei flow measurements would be good. Xioayu's talk also has results on light nuclei flow 

Best,

Sooraj

On Tue, Aug 29, 2023 at 10:01 AM rishabh <rishabh AT rcf.rhic.bnl.gov> wrote:

Dear Sooraj,

Thank you so much for your comments. Please find the revised version of
slides here: https://drupal.star.bnl.gov/STAR/node/64854

> It is somewhat surprising that v3 shows good mass scaling, while v2
> doesn't. Is there an explanation for this?

We are reporting that within the statistical uncertainties, we observe
that v3 has better mass number scaling.

> From BES-I results, we had claimed that mass number scaling holds for
> v2 within pT/A < 1.5 GeV (PRC 94, 034908 (2016)). With BES-II we see
> deviations. Do you have a comparison of the BES-I and BES-II results
> for the different particle species?

Please find the link to the slides comparing light nuclei v2 results
between BES-I and BES-II here:
https://drupal.star.bnl.gov/STAR/blog/rishabh/Comparison-light-nuclei-v2-between-BES-I-and-BES-II-energies

> S4: What is the equation about?

The ALICE Collaboration uses this equation to calculate vn of deuterons
from vn of protons. The results are shown as blue bands in the figure.

> S4: Why is the fluctuating initial conditions relevant here?

I was hoping to provide motivation for v3 studies of light nuclei.

> S5: Please include EPD and ETOF also under BES-II upgrades

Implemented.

> S5: track momentum and event plane?

Implemented.

> S6: What is track resolution?

Changed it to track momentum resolution.

> S9: What is the low pT you refer to here? Please indicate the range

Implemented.

> S12: seems to be --> is in

Implemented.

> S15: Can you quantify the extend of scaling? May be fit a constant to
> your lower plots and evaluate the value and uncertainty. This should
> tell you to within what percentage you can claim v3 scaling

We observe an agreement with mass number scaling within ~10% for v3 of
light nuclei.

> S16: seems to be --> is in

Implemented.

> S17: You could also point to other light nuclei flow results from STAR
> (Chengdong's talks for eg). In th outlook, you can indicate the
> remaining energies to be measured and their relevance

Implemented.

Please let me know if you have any further suggestions for me.

Thanks and regards,
Rishabh









On 2023-08-29 02:38, Sooraj Radhakrishnan wrote:
> Hi Rishabh,
>    Thanks for preparing the nice presentation and the interesting
> results. Please find a few comments from me below
>
> It is somewhat surprising that v3 shows good mass scaling, while v2
> doesn't. Is there an explanation for this?
>
> From BES-I results, we had claimed that mass number scaling holds for
> v2 within pT/A < 1.5 GeV (PRC 94, 034908 (2016)). With BES-II we see
> deviations. Do you have a comparison of the BES-I and BES-II results
> for the different particle species?
>
> S4: What is the equation about?
> S4: Why is the fluctuating initial conditions relevant here?
> S5: Please include EPD and ETOF also under BES-II upgrades
> S5: track momentum and event plane?
> S6: What is track resolution?
> S9: What is the low pT you refer to here? Please indicate the range
> S12: seems to be --> is in
> S15: Can you quantify the extend of scaling? May be fit a constant to
> your lower plots and evaluate the value and uncertainty. This should
> tell you to within what percentage you can claim v3 scaling
> S16: seems to be --> is in
>
> S17: You could also point to other light nuclei flow results from STAR
> (Chengdong's talks for eg). In th outlook, you can indicate the
> remaining energies to be measured and their relevance
>
> Best,
> Sooraj
>
> On Mon, Aug 28, 2023 at 7:09 AM rishabh via Star-fcv-l
> <star-fcv-l AT lists.bnl.gov> wrote:
>
>> Dear Subhash,
>>
>> Thank you for your comments. Please find the revised version of
>> slides
>> here: https://drupal.star.bnl.gov/STAR/node/64854.
>>
>>> s#4: This is for my understanding, how light nuclei v3 of has
>> better
>>> sensitivity to initial fluctuation, if they are formed at later
>> stage?
>>
>> Nucleons will propagate the initial state fluctuations if the light
>> nuclei are formed by the coalescence mechanism.
>>
>>> s#9: Could you indicate the fraction of reduction in error in
>> BES-II
>>> relative to BES-I?
>>
>> The improvement in statistical uncertainty varies from particle to
>> particle and with the pT bin. On average, we observe a 30–40%
>> improvement in BES-II energies compared to BES-I energies.
>> Instead of writing it down on the slide, I was hoping, just like in
>> my
>> SQM talk, that I could tell the fraction while delivering the talk.
>> Please let me know if that is okay.
>>
>>> s#14: At the lowest pT, I see v3 of p and d are consistent. It
>> might be
>>> better if you specify the pt-range for which mass dependence is
>>> observed.
>>
>> Implemented.
>>
>>> s#15: You can indicate fit to proton data beside the function in
>> the
>>> legend. The Y-axis scale of the bottom panels is very large, can
>> you
>>> try reducing them, so the level of scaling would be clearly
>> visible.
>>
>> Implemented.
>>
>> Please let me know if you have any further suggestions for me.
>>
>> Thanks and regards,
>> Rishabh
>>
>> On 2023-08-28 13:14, subhash via Star-fcv-l wrote:
>>> Dear Rishabh,
>>>
>>> Nice slides. I have a few suggestions for your consideration:
>>>
>>> s#4: This is for my understanding, how light nuclei v3 of has
>> better
>>> sensitivity to initial fluctuation, if they are formed at later
>> stage?
>>>
>>> s#9: Could you indicate the fraction of reduction in error in
>> BES-II
>>> relative to BES-I?
>>>
>>> s#14: At the lowest pT, I see v3 of p and d are consistent. It
>> might
>>> be better if you specify the pt-range for which mass dependence is
>>> observed.
>>>
>>> s#15: You can indicate fit to proton data beside the function in
>> the
>>> legend.
>>> The Y-axis scale of the bottom panels is very large, can you try
>>> reducing them, so the level of scaling would be clearly visible.
>>>
>>>
>>> Thanks and regsrds,
>>> Subhash
>>>
>>>
>>> On 2023-08-24 10:01 PM, webmaster--- via Star-fcv-l wrote:
>>>> Dear star-fcv-l AT lists.bnl.gov members,
>>>>
>>>> Rishabh Sharma (rishabhsharma AT students.iisertirupati.ac.in) has
>>>> submitted a
>>>> material for a review, please have a look:
>>>> https://drupal.star.bnl.gov/STAR/node/64854
>>>>
>>>> Deadline: 2023-09-03
>>>> ---
>>>> If you have any problems with the review process, please contact
>>>> webmaster AT www.star.bnl.gov
>>>> _______________________________________________
>>>> Star-fcv-l mailing list
>>>> Star-fcv-l AT lists.bnl.gov
>>>> https://lists.bnl.gov/mailman/listinfo/star-fcv-l
>>> _______________________________________________
>>> Star-fcv-l mailing list
>>> Star-fcv-l AT lists.bnl.gov
>>> https://lists.bnl.gov/mailman/listinfo/star-fcv-l
>> _______________________________________________
>> Star-fcv-l mailing list
>> Star-fcv-l AT lists.bnl.gov
>> https://lists.bnl.gov/mailman/listinfo/star-fcv-l
>
> --
>
> 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 [1]
>
> Email: skradhakrishnan AT lbl.gov
>
>
> Links:
> ------
> [1] tel:%28510%29%20495-2473

--

Sooraj Radhakrishnan

Research Scientist,

Department of Physics

Kent State University

Kent, OH 44243

Physicist Postdoctoral Affiliate

Nuclear Science Division
Lawrence Berkeley National Lab
MS70R0319, One Cyclotron Road

Berkeley, CA 94720

Ph: 510-495-2473

Email: skradhakrishnan AT lbl.gov