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Article overview
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Multi moment cancellation of participant fluctuations - MMCP method | | Viktor Begun
; Maja Mackowiak-Pawlowska
; | | Date: |
2 May 2017 | | Abstract: | We propose a new way to correct for finite centrality bin width effect i.e.
participant fluctuations in fluctuation analysis in high energy nucleus-nucleus
collisions. The MMCP method allows to separate participant fluctuations and
obtain fluctuations from one participant - a source - from a combination of the
experimentally measured first four moments. The EPOS model is used for the
numerical check of the MMCP for the net electric charge fluctuations in the
forward rapidity region in Ar+Sc reactions at beam momentum 150 GeV/c. We show
that using the existing methods - decreasing a centrality bin width, or using
the Centrality Bin Width Correction procedure, one may still leave some
residual participant fluctuations in the sample. Moreover, we show that the
Centrality Bin Width Correction procedure may alter the fluctuation measures.
The most important advantage of the MMCP is it’s precision even when the amount
of measured events does not allow to decrease the centrality bin width, or the
experimental determination of participants is difficult, e.g. in collider
experiments. Even for the largest centrality bin in the considered case,
$c=0-20\%$, the relative error of the MMCP for the scaled variance of a source
is below 2\%. It is especially important in determination of the base line of
the fluctuations in the search for the QCD Critical Point and the signals of
the QCD phase transition. | | Source: | arXiv, 1705.1110 | | Services: | Forum | Review | PDF | Favorites | |
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