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STAR Upsilon projection for 2023-2025
This page collects information about the expected precision with which the STAR experiment an measure Upsilon suppression in 2023-2025.
- 2011, Au+Au 200 GeV, di-electron channel, L ~ 2.4 nb-1 (PA: Shuai Yang, Analysis note)
- 2015, p+Au 200 GeV, di-electron channel, L ~ 302 nb-1 (PA: Zaochen Ye, Analysis note)
- 2015, p+p 200 GeV, di-electron channel, L ~ 96 pb-1 (PA: Zaochen Ye)
The toy Monte Carlo study is set up as the following:
- Extract the number of Y(1S), Y(2S), Y(3S) if any, combinatorial background and residual background (bb+Drell-Yan) in different pT and centrality bins from current measurements
- Scale these numbers up by the ratio of the expected sampled luminosities in full vertex range by sPHENIX and the current luminosities analyzed by STAR. The scale factors are 53, 4.8 and 2.8 for Au+Au, p+Au and p+p collisions, respectively
- Simulate the Y(nS) signal with the scaled counts, decay them into two electrons and smear the electron pT with the expected momentum resolution in 2023-2025. Here the expected momentum resolution is extracted from HIJING simulations with an ideal geometry of TPC+iTPC+CF4.
- Simulate the expected number of combinatorial and residual background
- Fill the unlike-sign invariant mass distribution with Y(nS), combinatorial and residual background, while the like-sign distribution with combinatorial background only
- Fit the unlike-sign and like-sign distributions simultaneously with a binned maximum likelihood method
- Obtain the expected Y(nS) counts from fits
- Details of the study can be found here: slides
Invariant mass distribution
Error projection for nuclear modification factors
sPHENIX projection
The following slides taken from a QM2019 presentation shows the expected luminosity to be sampled in 2023-2025, and the expected Upsilon mass resolution in p+p collisions with the sPHENIX detector.STAR projection
The projections are based on the following measurements currently available:- 2011, Au+Au 200 GeV, di-electron channel, L ~ 2.4 nb-1 (PA: Shuai Yang, Analysis note)
- 2015, p+Au 200 GeV, di-electron channel, L ~ 302 nb-1 (PA: Zaochen Ye, Analysis note)
- 2015, p+p 200 GeV, di-electron channel, L ~ 96 pb-1 (PA: Zaochen Ye)
The toy Monte Carlo study is set up as the following:
- Extract the number of Y(1S), Y(2S), Y(3S) if any, combinatorial background and residual background (bb+Drell-Yan) in different pT and centrality bins from current measurements
- Scale these numbers up by the ratio of the expected sampled luminosities in full vertex range by sPHENIX and the current luminosities analyzed by STAR. The scale factors are 53, 4.8 and 2.8 for Au+Au, p+Au and p+p collisions, respectively
- Simulate the Y(nS) signal with the scaled counts, decay them into two electrons and smear the electron pT with the expected momentum resolution in 2023-2025. Here the expected momentum resolution is extracted from HIJING simulations with an ideal geometry of TPC+iTPC+CF4.
- Simulate the expected number of combinatorial and residual background
- Fill the unlike-sign invariant mass distribution with Y(nS), combinatorial and residual background, while the like-sign distribution with combinatorial background only
- Fit the unlike-sign and like-sign distributions simultaneously with a binned maximum likelihood method
- Obtain the expected Y(nS) counts from fits
- Details of the study can be found here: slides
Invariant mass distribution
Error projection for nuclear modification factors
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