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Article overview
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Higher Moments of Net-proton Multiplicity Distribution in Heavy-Ion Event Pile-up Scenario | P. Garg
; D. K. Mishra
; | Date: |
3 May 2017 | Abstract: | The high luminosity modern accelerators like the Relativistic Heavy Ion
Collider (RHIC) at BNL and Large Hadron Collider (LHC) at CERN, may result
event pile-ups which significantly contribute to the physics events as a
background. While the state of art tracking algorithms and the detector
concepts take care of these event pile-ups mostly, also several offline
analysis techniques are used to remove such events from the physics analysis.
On the other hand, it is also difficult to quantify the remaining pile-ups in
an event sample for physics analysis. Since the fraction of these events is
significantly small, it may not be a serious issue for other analysis as they
are for an event-by-event analysis. Particularly, when the details of the shape
of the multiplicity distribution is an observable, one needs to be very careful
while doing such physics analysis. In the present work, we demonstrate that how
a very small fraction of pile-up events can change the moments and their ratios
of an event-by-event net-proton distribution which are sensitive to the
dynamical fluctuations due to the QCD critical point. For this study we assume
that the individual event-by-event proton and anti-proton multiplicity
distributions follow a Poisson or negative binomial distribution (NBD). We
observe a significant increase of cumulant ratios of net-proton multiplicity at
lower energies due to pile-up events, which can change the interpretation of
the experimental observable for critical point. | Source: | arXiv, 1705.1256 | Services: | Forum | Review | PDF | Favorites |
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