STAR Correlations and Fluctuations PWG

[Nu Xu <nxu AT lbl.gov>]

Hi All,

I agree with Dan’s comment that it is desirable to have data at the center of 
mass energy  7.2GeV. To me, the most important purpose here is to ‘calibrate' 
the proton fluctuation analysis with the FXT mode. In addition, the high 
statistic data will be very useful for the study of hypernuclei productions 
at the high density region.

A question: Do we have the proton acceptance plot p_T vs. rapidity with iTPC 
and eTOF, at 7.2GeV?  

Best regards,

Nu

> On Oct 9, 2020, at 8:59 AM, Daniel Cebra via Star-cf-l 
> <star-cf-l AT lists.bnl.gov> wrote:
> 
> 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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