STAR Correlations and Fluctuations PWG

[Daniel Cebra <cebra AT physics.ucdavis.edu>]

Hello CF PWG,

   An argument for taking additional statistics of FXT data at 7.2 GeV is that the analysis of these data might help confirm the collider fluctuation results at 7.7 GeV. Granted, we would prefer more data at the FXT energy of 7.7 in order to best make this comparison, however 7.2 is the opportunity that we have. Another drawback of this FXT energy is that we have very limited mid-rapidity acceptance, so we would need very high statistics for a statistically significant result - higher than we are likely to acquire in the next two years of parasitic running. However, we ought to do a quick look at the ExpressStream data that we acquired this year to generate more reliable event statistics requirements.

Regards, Daniel

On Fri, Oct 9, 2020 at 8:25 AM Xiaofeng Luo via Star-cf-l <star-cf-l AT lists.bnl.gov> wrote:

Dear CVers :

It was brought up recently at convener-management meeting :
What kind of data set STAR would like to take parasitically during CEC
in Run 21.

Previously, STAR took 300M fixed target data at 7.2 GeV parasitically
during CEC run in Run-20.

STAR discussed with CAD/CEC experts and it is totally possible to take
collider data, namely 54 GeV AuAu collisions, parasitically. There is no
technical difficulty but they need to know STAR's decision asap so that
they can get paperwork approved in time.

In 2017, STAR took 800M 54 GeV Au+Au events during 3-weeks CEC running.

Two weeks ago at the closeout, PAC approved 2-week CEC running for
Run-21 and another two weeks for Run-22. If you add them together, that
is 4-week CEC running.

We can either take a high-statistics 54 GeV with a better detector
(iTPC, eTOF, and EPD now in place, but not in Run-2017) or continue to
take 7.2 GeV data which will also have high-statistics.

Based on Lijuan's  estimation, 1B is probably a guidance for the
2021+2022 statistics (54 GeV: 4/3*800M ~ 1.07B , FXT 7.2 GeV : 28/9*317M
~ 0.986B)

 From net-proton cumulants measurements, it would be good to take this
chance to take more 54 GeV data to measure net-proton C6. (higher
statistics, with iTPC, eTOF, EPD in place)

Please share your thoughts and send your feedback by early next week.

Thank you,
Best Regards,
Hanna and XIaofeng

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