Multiplicity studies and effective energy in ALICE at the LHC |
| |
Authors: | A Akindinov A Alici P Antonioli S Arcelli M Basile G Cara Romeo M Chumakov L Cifarelli F Cindolo A De Caro D De Gruttola S De Pasquale M Fusco Girard C Guarnaccia D Hatzifotiadou HT Jung WW Jung DW Kim HN Kim JS Kim S Kiselev G Laurenti K Lee SC Lee E Lioublev ML Luvisetto A Margotti A Martemiyanov R Nania F Noferini P Pagano A Pesci R Preghenella G Russo E Scapparone G Scioli R Silvestri Y Sun I Vetlitskiy K Voloshin L Vorobiev MCS Williams B Zagreev C Zampolli A Zichichi |
| |
Institution: | (1) Institute for Theoretical and Experimental Physics , Moscow , Russia;(2) Dipartimento di Fisica dell’Università , Bologna , Italy;(3) Sezione INFN , Bologna , Italy;(4) Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi” , Rome, Italy;(5) Dipartimento di Fisica dell’Università and INFN , Salerno , Italy;(6) Department of Physics , Kangnung National University , Kangnung , South Korea;(7) World Laboratory , Lausanne, Switzerland |
| |
Abstract: | In this work we explore the possibility to perform “effective energy” studies in very high energy collisions at the CERN large
hadron collider (LHC). In particular, we focus on the possibility to measure in pp collisions the average charged multiplicity
as a function of the effective energy with the ALICE experiment, using its capability to measure the energy of the leading
baryons with the zero degree calorimeters. Analyses of this kind have been done at lower centre-of-mass energies and have
shown that, once the appropriate kinematic variables are chosen, particle production is characterized by universal properties:
no matter the nature of the interacting particles, the final states have identical features. Assuming that this universality
picture can be extended to ion–ion collisions, as suggested by recent results from RHIC experiments, a novel approach based on the scaling hypothesis for limiting
fragmentation has been used to derive the expected charged event multiplicity in AA interactions at LHC. This leads to scenarios
where the multiplicity is significantly lower compared to most of the predictions from the models currently used to describe
high energy AA collisions. A mean charged multiplicity of about 1000–2000 per rapidity unit (at η∼0) is expected for the most
central Pb–Pb collisions at .
In memory of A. Smirnitskiy |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|