STAR HardProbes PWG

["Ma, Rongrong" <marr AT bnl.gov>]

Hello Nihar

Thanks for the numerical values. If I sum up the recoil jet yields for pp and 
AA, here is what I get. 

1) pi0 trigger, R = 0.2, 10 < pT < 15 GeV/c
Y_AA = 0.030
Y_pp = 0.065 (the last bin with upper limit does not matter since its yield 
is so much smaller than the other three dphi bins)
I_AA = Y_AA/Y_pp ~ 0.47

1) pi0 trigger, R = 0.2, 15 < pT < 20 GeV/c
Y_AA = 0.012
Y_pp = 0.063
I_AA = Y_AA/Y_pp ~ 0.19

These I_AA values are consistent with Fig. 3 in the paper, but not Fig. 28 in 
AN where you demonstrate the consistency. Could you double check the 
procedure for getting Fig. 28?

As I am looking at this in more detail, another question arises. For pi0+jet 
measurements in p+p collisions, you have upper limits for the dphi bin 
furthest to pi for both R = 0.2 and 0.5, which makes sense. However, you have 
upper limits for I_AA for R = 0.5, and lower limits for R = 0.2 jets. Why is 
this the case? How do you derive an upper limit on I_AA given the upper limit 
on Y_pp? 

Thanks. 

Best
Rongrong

> On Jun 21, 2024, at 6:29 AM, Nihar Sahoo <nihar AT rcf.rhic.bnl.gov> wrote:
> 
> Hello Rongrong,
> 
> Please find the data points here.
> Upper bound of last bin is mentioned there separately.
> https://drupal.star.bnl.gov/STAR/blog/nihar/acoplanarity-pp-data
> 
> Thank you
> Nihar
> 
> On 2024-06-21 01:09, Ma, Rongrong wrote:
>> Hello Nihar
>> Thanks for the numbers. Could you also send out the recoil jet yields
>> in pp and AA collisions for the four dphi bins between 2.2 and 3.14,
>> as shown in Fig. 2 of the paper? Could you do the same for 10-15 GeV/c
>> as well? Thanks.
>> Best
>> Rongrong
>>> On Jun 20, 2024, at 2:59 PM, Nihar Sahoo <nihar AT rcf.rhic.bnl.gov> wrote:
>>> Hello Rongrong,
>>> As you mentioned this is a bit tricky to get exactly the same yield for 
>>> two cases due to dphi weights and also unequal total dphi sum from Fig.2.
>>> But I tried to estimate the yield for one case (15-20 GeV/c and R=0.2) 
>>> and calculate IAA.
>>> Here is the value 3.14 to 2.2 rad.
>>> 0.0033 (AA) /0.0109(pp) = 0.302 (IAA from Dphi) that is close to IAA(pT) 
>>> ~0.3.
>>> I have not considered uncertainty calculation.
>>> Best
>>> Nihar
>>> On 2024-06-20 02:38, Ma, Rongrong wrote:
>>>> Hello Nihar
>>>> Thanks for updating Fig. 3 in the paper.
>>>> As you mentioned, different dPhi bins contribute differently to the
>>>> integrated recoil jet yields and I_AA for 2.35 < dphi < 3.14. However,
>>>> according to Fig. 2 of the paper, recoil jet yield drops exponentially
>>>> with decreasing dphi, so the new bins with upper limits that you just
>>>> added are furthest to dphi = 3.14, and thus contribute the least. It
>>>> is not clear to me how they can pull the integrated I_AA so
>>>> significantly. If possible, I suggest to directly compare recoil jet
>>>> yields for the two cases (vs. pt or vs. dphi). This can avoid the
>>>> complicated weighted average of I_AA.
>>>> Best
>>>> Rongrong
>>>>> On Jun 19, 2024, at 12:07 PM, Nihar Sahoo <nihar AT rcf.rhic.bnl.gov> 
>>>>> wrote:
>>>>> Hello Rongrong,
>>>>> Thank you for pointing this.
>>>>> A updated upper bound for R=0.2 of 15-20 GeV/c pi0+jet case is included 
>>>>> in paper Fig.3. (It was missed in previous draft but now corrected)
>>>>> This one I checked it before.
>>>>> For pi0+jet 15-20 GeV/c R=0.2 case:
>>>>> As this is a differential measurement in Delta phi, each dphi 
>>>>> contributes differently.
>>>>> The last bin which is reported with upper bound is greater than 
>>>>> I_AA=0.3 (see revised Fig.3), hence this bin contributes such that 
>>>>> resultant integrated IAA(pTjet) value is around 0.3 (which is del_phi: 
>>>>> 2.35 to 3.14 rad).
>>>>> The same scenario is for 10-15 GeV/c for R=0.2; where the upper bound 
>>>>> is lower than 0.3, and that contributes to Integrated IAA(pTjet) value.
>>>>> The updated paper draft (same v2): 
>>>>> https://drupal.star.bnl.gov/STAR/system/files/AcoplanarityPaper_v2.pdf
>>>>> Best
>>>>> Nihar
>>>>> On 2024-06-19 03:35, Ma, Rongrong wrote:
>>>>>> Hello Nihar
>>>>>> Thanks a lot for addressing my comments. Those plots for consistency
>>>>>> check in AN are very useful. However, it is not clear how you extract
>>>>>> the I_AA values from dPhi differential measurement. Do you use the
>>>>>> same dPhi range and same pp reference as in I_AA(pT) analysis? In the
>>>>>> lower panel of Fig. 28, integrated I_AA(dphi) ~ 0.3 for pi0 triggers
>>>>>> and recoil R = 0.2 jets of 15 - 20 GeV/c. However, in Fig. 3, bottom
>>>>>> panel of the paper draft, I_AA values in all three dPhi bins are below
>>>>>> 0.3. Why? The same question goes to pi0 trigger, recoil R = 0.2 jets
>>>>>> of 10-15 GeV/c. The integrated I_AA value is about 0.3 in AN, but all
>>>>>> three I_AA(dphi) values are above 0.4 in the paper draft.
>>>>>> Best
>>>>>> Rongrong
>>>>>>> On Jun 18, 2024, at 4:25 AM, Nihar Sahoo via Star-hp-l 
>>>>>>> <star-hp-l AT lists.bnl.gov> wrote:
>>>>>>> Hello Rongrong, Yi , and Isaac,
>>>>>>> Thank you for your constructive comments.
>>>>>>> We have worked on your comments. Please find our responses at one 
>>>>>>> place:
>>>>>>> (Rongrong, Yi, and Isaac's comments are in order)
>>>>>>> https://drupal.star.bnl.gov/STAR/system/files/PWGComments_Acoplanarity_June16.pdf
>>>>>>> In this revised paper draft, Supplement material is included.
>>>>>>> Revised paper draft 
>>>>>>> (v2):https://drupal.star.bnl.gov/STAR/system/files/AcoplanarityPaper_v2.pdf
>>>>>>> Revised AN v2: 
>>>>>>> https://drupal.star.bnl.gov/STAR/system/files/AcoplanarityAanalysisNote_V2_0.pdf
>>>>>>> We request HP-pwg converners to help us forming GPC.
>>>>>>> Best
>>>>>>> Nihar for PAs( Derek, Saskia, Peter)
>>>>>>> On 2024-05-06 12:55, Yi Yang wrote:
>>>>>>>> Hi Nihar,
>>>>>>>> Thanks a lot for the well-written draft and analysis note.
>>>>>>>> I agree with Rongrong's comments, so won't repeat here. I have some
>>>>>>>> minor ones for your consideration.
>>>>>>>> Paper draft:
>>>>>>>> - L36 - 38: the hyphens look a bit strange to me, it should look
>>>>>>>> like the one in L26.  (similar for L314 and 315)
>>>>>>>> - L41: high energy --> high-energy
>>>>>>>> - L58: pT, jet > 30 GeV/c
>>>>>>>> - L59: R=0.3 --> R = 0.3
>>>>>>>> - L116: Gev --> GeV
>>>>>>>> - Eq.(1) and (2): it should be d^2 N_jet and d^2 sigma
>>>>>>>> - L156: sqrt(s_NN)=200 GeV --> sqrt(s_NN) = 200 GeV
>>>>>>>> - Figure 1: I would suggest to put the information in the right
>>>>>>>> panel to the left panel as well, just in case someone cut the left
>>>>>>>> panel only and there is no information on that.
>>>>>>>> - L229: What does "TBD" mean here? Will this affect the final
>>>>>>>> physics conclusion?
>>>>>>>> - L245: Fig.2 --> Figure 2
>>>>>>>> Question: (I probably asked it earlier) you show different behavior
>>>>>>>> for R = 0.2 and 0.5, does it make sense to try other R numbers to see
>>>>>>>> the actual R-dependence?
>>>>>>>> Analysis note:
>>>>>>>> - L172: Figure 23 --> Figure 9?
>>>>>>>> - Question: you are using PYTHIA-8 in the embedding/simulation, but
>>>>>>>> you used PYTHIA-6 for the comparison in the result. Why not use the
>>>>>>>> same version of PYTHIA?
>>>>>>>> -  Don't you have the systematics from the unfolding iteration?
>>>>>>>> - Figure 23: It clearly shows the closure is not good between 2.5
>>>>>>>> and 3, and you are using log in the ratio. Any systematics associated
>>>>>>>> with it?
>>>>>>>> - L403, 404: there are "TBA"s, what does that mean?
>>>>>>>> - L435: The uncertainty on dPhi weights is "TBD"?
>>>>>>>> - Figure 26: do you have a similar plot for R = 0.2? What do the two
>>>>>>>> "light blue" lines mean here?
>>>>>>>> Cheers,
>>>>>>>> Yi
>>>>>>>> On Mon, Apr 8, 2024 at 10:16 AM Nihar Sahoo via Star-hp-l
>>>>>>>> <star-hp-l AT lists.bnl.gov> wrote:
>>>>>>>>> Hello HP-pwg,
>>>>>>>>> We have finalized STAR gamma+jet and pi0+jet acoplanarity paper
>>>>>>>>> draft.
>>>>>>>>> Paper draft, analysis Note, and paper webpage can be found below.
>>>>>>>>> Please send your comment and feedback.
>>>>>>>>> We request to form GPC.
>>>>>>>>> Paper draft:
>>>>>>>> https://drupal.star.bnl.gov/STAR/system/files/AcoplanarityPaper_v1.pdf
>>>>>>>>> Analysis Note:
>>>>>>>> https://drupal.star.bnl.gov/STAR/system/files/AcoplanarityAanalysisNote_V0_0.pdf
>>>>>>>>> Paper webpage:
>>>>>>>> https://drupal.star.bnl.gov/STAR/blog/nihar/Paper-webpage-Measurement-direct-photonjet-and-pi0jet-azimuthal-correlation-AuAu-and-pp-c
>>>>>>>>> Thank you
>>>>>>>>> PAs (Nihar, Derek, Saskia, and Peter)
>>>>>>>>> _______________________________________________
>>>>>>>>> Star-hp-l mailing list
>>>>>>>>> Star-hp-l AT lists.bnl.gov
>>>>>>>>> https://lists.bnl.gov/mailman/listinfo/star-hp-l
>>>>>>> _______________________________________________
>>>>>>> Star-hp-l mailing list
>>>>>>> Star-hp-l AT lists.bnl.gov
>>>>>>> https://lists.bnl.gov/mailman/listinfo/star-hp-l