Relative particle yield fluctuations in $\text{ Pb-Pb }$ collisions at $\sqrt{s_\mathrm{{NN}}} =2.76\hbox { TeV}$ - INSPIRE

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Relative particle yield fluctuations in $\text{ Pb-Pb }$ collisions at $\sqrt{s_\mathrm{{NN}}} =2.76\hbox { TeV}$

ALICE

Collaboration

Dec 21, 2017

19 pages

Published in:

Eur.Phys.J.C 79 (2019) 3, 236

Published: Mar 14, 2019

e-Print:

1712.07929 [nucl-ex]

DOI:

10.1140/epjc/s10052-019-6711-x

Report number:

CERN-EP-2017-318

Experiments:

CERN-LHC-ALICE

View in:

reference search24 citations

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Abstract: (Springer)

First results on

\hbox {K}/\pi

,

\hbox {p}/\pi

and K/p fluctuations are obtained with the ALICE detector at the CERN LHC as a function of centrality in

\text{ Pb--Pb }

collisions at

\sqrt{s_\mathrm{{NN}}} =2.76\hbox { TeV}

. The observable

\nu _{\mathrm{dyn}}

, which is defined in terms of the moments of particle multiplicity distributions, is used to quantify the magnitude of dynamical fluctuations of relative particle yields and also provides insight into the correlation between particle pairs. This study is based on a novel experimental technique, called the Identity Method, which allows one to measure the moments of multiplicity distributions in case of incomplete particle identification. The results for

\hbox {p}/\pi

show a change of sign in

\nu _{\mathrm{dyn}}

from positive to negative towards more peripheral collisions. For central collisions, the results follow the smooth trend of the data at lower energies and

\nu _{\mathrm{dyn}}

exhibits a change in sign for

\hbox {p}/\pi

and K/p.

Note:

19 pages, 4 captioned figures, 2 tables, authors from page 14, submitted to EPJC, figures at http://aliceinfo.cern.ch/ArtSubmission/node/4136

particle: yield
heavy ion: scattering
p: fluctuation
particle: multiplicity
yield: fluctuation
particle identification
impact parameter
CERN LHC Coll
experimental results
correlation

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