STAR Flow, Chirality and Vorticity PWG

[arkadij71 <arkadij71 AT gmail.com>]

Dear   ShinIchi   and  Jiangyong ,
Thank you very much for the comments. Our pid v2 results are fully consistent
with published STAR v2 pid results from
Phys. Rev. C 93 (2016) 14907
Phys. Rev. C 88 (2013) 14902
Phys. Rev. Lett. 110 (2013) 142301
for 0-10%, 10-40% , 40-80% and 0-80% for
all points in collision energy as it was demonstrated. It means that STAR published
results also show such pt dependence for the difference between v2 of K+
and K- for all bins in centrality and collision energy.
We think that the STAR published results are correct as they were obtained
with more probably robust procedure for kaon/pion separation using m2 rotation method.
We are using the stringent cut on mass2 for particle separation. However, we
are getting consistent results for v2 with published ones.
We understand your concern and worry about the particle purity and our students
Alexey Povarov and Alexander Demanov are started to do the homework - however, 

we are not able to finish it before the
conference and therefore we proposed to limit pt range for kaons in the figure on
slide 11 to pt range - where pions and kaons are very well separated. We will come
back with the results of the homework soon. If you request to remove slide 11 from the conference
presentation we agree to do it.
Concerning the systematics, the biggest source is coming from the results for different
eta gaps. The influence of different PID cuts was found to be small as it was shown.
We plan to check the rotation mass2 method as an additional cross-check.

With best regards
Petr,  Alexander , Alexey, Grigory, Arkadiy,  

On Fri, Oct 2, 2020 at 4:51 PM ShinIchi Esumi via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:

Dear Petr
One more point that if you think the ratio (or difference) does have issues,
Then we should also be worrying about individual vn for k+ and k- as well.

After you store all your preliminary plots in the
special drupal area for the preliminary location with necessary information at :
https://drupal.star.bnl.gov/STAR/pwg/bulk-correlations/bulkcorr-preliminary-summary
then I would approve your talk.
Best regards, ShinIchi

> On Oct 2, 2020, at 22:14, ShinIchi Esumi via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:
>
> Dear Petr
> Concerning on the same point on page 11 as Jiangyong mentioned, we’ve asked you
> to make sure the sign change of kaon vn ratio (and difference) at higher pT is real or
> it’s coming from pion contamination etc, which we did not hear you back on this particular
> issue, but it seems that you have now excluded the higher pT point from the plot, although
> you’ve shown us in the collaboration meeting up to higher pT and it was consistent with
> our previous publication, which might have the same issue as well, then we would need to
> correct the previous data, if this is really the case. Does that mean you do now think they
> are indeed affected by some PID problem at high pT? Since you’ve changed the plot in
> the last minutes after the last PWG, I would think we should be excluding these ratios (and
> differences) plots at least for kaon as a function of pT, until you explain us with more details
> especially in terms of the sign change trend with systematic error including PID purity etc.
> What do you think?
> Best regards, ShinIchi
>
>> On Oct 2, 2020, at 20:59, Jiangyong Jia via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:
>>
>> Hi, Grigory and Petr,
>>
>> The slides are nicely written, I don't have major comments on the structure of the talk.
>>
>> I have one question that I asked during Petr's presentation a couple weeks ago.
>>
>> Slide 11 when you show the difference and ratios between particle and antiparticles, the errors are extremely small.
>> Do you assume the systematic uncertainty mostly cancel?  What about the purity and efficiency of PID cut, I assume
>> they will not cancel (yield of particles are anti-particles are different at low energy)
>>
>> thanks,
>>
>> Jiangyong
>>
>> n 10/2/20 6:47 AM, Grigory Nigmatkulov via Star-fcv-l wrote:
>>> Dear Conveners,
>>>
>>> Please take a look at the Petr Parfenov's slides and sign off you have no questions.
>>> The conference starts on Monday.
>>>
>>> Best regards,
>>> Grigory, Arkadiy and Petr
>>>
>>> On Wed, 23 Sep 2020 at 20:53, webmaster--- via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:
>>> Dear star-fcv-l AT lists.bnl.gov members,
>>>
>>> Grigory Nigmatkulov (nigmatkulov AT gmail.com) has submitted a material for a 
>>> review, please have a look:
>>> https://drupal.star.bnl.gov/STAR/node/52191
>>>
>>> ---
>>> If you have any problems with the review process, please contact 
>>> webmaster AT www.star.bnl.gov
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