Charged-particle multiplicities in pp interactions at sqrt(s)=900GeV measured with the ATLAS detector at the LHC

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Abstract

The first measurements from proton–proton collisions recorded with the ATLAS detector at the LHC are presented. Data were collected in December 2009 using a minimum-bias trigger during collisions at a centre-of-mass energy of 900 GeV. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity, and the relationship between mean transverse momentum and charged-particle multiplicity are measured for events with at least one charged particle in the kinematic range |η|<2.5 and pT>500 MeV. The measurements are compared to Monte Carlo models of proton–proton collisions and to results from other experiments at the same centre-of-mass energy. The charged-particle multiplicity per event and unit of pseudorapidity at η=0 is measured to be 1.333±0.003(stat.)±0.040(syst.), which is 5–15% higher than the Monte Carlo models predict.

Autore Pugliese

Tutti gli autori

  • G. Aad , M. Bianco , E. Brambilla , G. Cataldi , A. Cazzato , G. Chiodini , M. R. Coluccia , R. Crupi , E. Gorini , F. Grancagnolo , A. Guida , R. Perrino , M. Primavera , S. Spagnolo , A. Ventura , et al.

Titolo volume/Rivista

PHYSICS LETTERS. SECTION B

Anno di pubblicazione

2010

ISSN

0370-2693

ISBN

Non Disponibile

Numero di citazioni Wos

138

Ultimo Aggiornamento Citazioni

28/04/2018

Numero di citazioni Scopus

61

Ultimo Aggiornamento Citazioni

28/04/2018

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile