Net-Charge Fluctuations in Pb-Pb collisions at \sqrt(s)_NN = 2.76 TeV

B. Abelev , N. Arbor (1) , G. Conesa Balbastre (1) , J. Faivre , C. Furget (1) , R. Guernane (1) , S. Kox (1) , J.S. Real (1) , C. Silvestre (1) , R. Vernet (2) , I. Belikov (3) , B. Hippolyte (3) , C. Kuhn (3) , C. Roy (3) , X. Sanchez Castro (3) , S. Senyukov (3) , Laurent Aphecetche (4) , Guillaume Batigne (4) , E. Bergognon (4) , M. Bregant (4) , H. Delagrange (4) , O. Driga (4) , B. Erazmus (4) , Magali Estienne (4) , Marie Germain (4) , A. Lardeux (4) , F. Lefèvre (4) , L. Luquin (4) , Gines Martinez Garcia (4) , A. Mas (4) , L. Massacrier (4) , A. Matyja (4) , Philippe Pillot (4) , Y. Schutz (4) , Alexandre Shabetai (4) , Diego Stocco (4) , C. Cheshkov (5) , B. Cheynis (5) , L. Ducroux (5) , J.-Y. Grossiord (5) , Maxime Guilbaud (5) , R. Tieulent (5) , A. Uras (5) , Y. Zoccarato (5) , Y.W. Baek (6) , A. Baldit (6) , V. Barret (6) , N. Bastid (6) , P. Crochet (6) , P. Dupieux (6) , R. Ichou (6) , X. Lopez (6) , F. Manso (6) , M. Marchisone (6) , S. Porteboeuf-Houssais (6) , P. Rosnet (6) , B. Vulpescu (6) , X. Zhang (6)

1 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
2 CC-IN2P3 - Centre de Calcul de l'IN2P3
3 DRS-IPHC - Département Recherches Subatomiques
4 SUBATECH - Laboratoire SUBATECH Nantes
5 IPNL - Institut de Physique Nucléaire de Lyon
6 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand

We report the first measurement of the net-charge fluctuations in Pb-Pb collisions at \surd s_NN 2.76 TeV, measured with the ALICE detector at the CERN Large Hadron Collider. The dynamical fluctuations per unit entropy are observed to decrease when going from peripheral to central collisions. An additional reduction in the amount of fluctuations is seen in comparison to the results from lower energies. We examine the dependence of fluctuations on the pseudo-rapidity interval, which may account for the dilution of fluctuations during the evolution of the system. We find that the ALICE data points are between the theoretically predicted values for a hadron gas and a Quark-Gluon Plasma.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]; Physique des Hautes Energies - Phénoménologie [hep-ph]; Physique Nucléaire Expérimentale [nucl-ex]; Physique Nucléaire Théorique [nucl-th]

B. Abelev, N. Arbor, G. Conesa Balbastre, J. Faivre, C. Furget, et al.. Net-Charge Fluctuations in Pb-Pb collisions at \sqrt(s)_NN = 2.76 TeV. Physical Review Letters, 2013, 110, pp.152301. ⟨10.1103/PhysRevLett.110.152301⟩. ⟨in2p3-00720872⟩