Measurements of primary charged hadron multiplicity distributions are presented for non-single-diffractive events in proton-proton collisions at centre-of-mass energies of root s = 0.9, 2.36, and 7 TeV, in five pseudorapidity ranges from vertical bar eta vertical bar < 0.5 to vertical bar eta vertical bar < 2.4. The data were collected with the minimum-bias trigger of the CMS experiment during the LHC commissioning runs in 2009 and the 7 TeV run in 2010. The multiplicity distribution at root s - 0.9 TeV is in agreement with previous measurements. At higher energies the increase of the mean multiplicity with root s is underestimated by most event generators. The average transverse momentum as a function of the multiplicity is also presented. The measurement of higher-order moments of the multiplicity distribution con firms the violation of Koba-Nielsen-Olesen scaling that has been observed at lower energies.

Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., et al. (2011). Charged particle multiplicities in pp interactions at root s=0:9, 2:36, and 7 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2011(1) [10.1007/JHEP01(2011)079].

Charged particle multiplicities in pp interactions at root s=0:9, 2:36, and 7 TeV

BENAGLIA, ANDREA DAVIDE;CERATI, GIUSEPPE BENEDETTO;DE GUIO, FEDERICO;DI MATTEO, LEONARDO;GHEZZI, ALESSIO;MALBERTI, MARTINA;MARTELLI, ARABELLA;MASSIRONI, ANDREA;MORONI, LUIGI;PAGANONI, MARCO;RAGAZZI, STEFANO;TABARELLI DE FATIS, TOMMASO;TANCINI, VALENTINA;Branca, A;Govoni, P;DINARDO, MAURO EMANUELE;
2011

Abstract

Measurements of primary charged hadron multiplicity distributions are presented for non-single-diffractive events in proton-proton collisions at centre-of-mass energies of root s = 0.9, 2.36, and 7 TeV, in five pseudorapidity ranges from vertical bar eta vertical bar < 0.5 to vertical bar eta vertical bar < 2.4. The data were collected with the minimum-bias trigger of the CMS experiment during the LHC commissioning runs in 2009 and the 7 TeV run in 2010. The multiplicity distribution at root s - 0.9 TeV is in agreement with previous measurements. At higher energies the increase of the mean multiplicity with root s is underestimated by most event generators. The average transverse momentum as a function of the multiplicity is also presented. The measurement of higher-order moments of the multiplicity distribution con firms the violation of Koba-Nielsen-Olesen scaling that has been observed at lower energies.
Articolo in rivista - Articolo scientifico
Dual Parton Model; Proton-Antiproton Collisions; Transverse-Momentum; Multiparticle Production; Nucleus Collisions; Hadron-Collisions; Cross-Sections; High-Energies; Minimum-Bias; ISR Energies; CMS; LHC
English
2011
2011
1
79
none
Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., et al. (2011). Charged particle multiplicities in pp interactions at root s=0:9, 2:36, and 7 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2011(1) [10.1007/JHEP01(2011)079].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/46326
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