Event-by-event mean pT fluctuations in pp and Pb–Pb collisions at the LHC

Abelev, B. and Planinić, Mirko and Poljak, Nikola and Simatović, Goran and Zyzak, M. (ALICE Collaboration) (2014) Event-by-event mean pT fluctuations in pp and Pb–Pb collisions at the LHC. European Physical Journal C, 74 (10). pp. 3077-15. ISSN 1434-6044

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Abstract

Event-by-event fluctuations of the mean transverse momentum of charged particles produced in pp collisions at √s = 0.9, 2.76 and 7 TeV, and Pb–Pb collisions at √sNN = 2.76 TeV are studied as a function of the chargedparticle multiplicity using the ALICE detector at the LHC. Dynamical fluctuations indicative of correlated particle emission are observed in all systems. The results in pp collisions show little dependence on collision energy. The Monte Carlo event generators PYTHIA and PHOJET are in qualitative agreement with the data. Peripheral Pb–Pb data exhibit a similar multiplicity dependence as that observed in pp. In central Pb–Pb, the results deviate from this trend, featuring a significant reduction of the fluctuation strength. The results in Pb– Pb are in qualitative agreement with previous measurements in Au–Au at lower collision energies and with expectations from models that incorporate collective phenomena.

Item Type: Article
Keywords: fluctuations, pT, LHC
Date: October 2014
Subjects: NATURAL SCIENCES > Physics
Additional Information: © CERN for the benefit of the ALICE collaboration 2014. This article is published with open access at Springerlink.com. Article funded by SCOAP3. Received: 22 July 2014. Accepted: 12 September 2014. Published online: 15 October 2014.
Divisions: Faculty of Science > Department of Physics
Publisher: Springer
Depositing User: Nikola Poljak
Date Deposited: 01 May 2015 19:24
Last Modified: 29 May 2016 19:49
URI: http://digre.pmf.unizg.hr/id/eprint/3932

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