Measurement of the forward charged-particle pseudorapidity density in pp collisions at with the TOTEM experiment

G. Antchev; P. Aspell; I. Atanassov; V. Avati; J. Baechler; V. Berardi; M. Berretti; E. Bossini; M. Bozzo; P. Brogi; E. Brücken; A. Buzzo; F. S. Cafagna; M. Calicchio; M. G. Catanesi; C. Covault; M. Csanád; T. Csörgő; M. Deile; K. Eggert; V. Eremin; R. Ferretti; F. Ferro; A. Fiergolski; F. Garcia; S. Giani; V. Greco; L. Grzanka; J. Heino; T. Hilden; M. R. Intonti; J. Kašpar; J. Kopal; V. Kundrát; K. Kurvinen; S. Lami; G. Latino; R. Lauhakangas; T. Leszko; E. Lippmaa; M. Lokajíček; M. Lo Vetere; F. Lucas Rodríguez; M. Macrí; L. Magaletti; T. Mäki; A. Mercadante; N. Minafra; S. Minutoli; F. Nemes; H. Niewiadomski; E. Oliveri; F. Oljemark; R. Orava; M. Oriunno; K. Österberg; P. Palazzi; J. Procházka; M. Quinto; E. Radermacher; E. Radicioni; F. Ravotti; E. Robutti; L. Ropelewski; G. Ruggiero; H. Saarikko; A. Santroni; A. Scribano; W. Snoeys; J. Sziklai; C. Taylor; N. Turini; V. Vacek; M. Vitek; J. Welti; J. Whitmore

doi:10.1209/0295-5075/98/31002

All issues

Volume 98 / No 3 (May 2012)

EPL, 98 3 (2012) 31002

Abstract

Open Access

Issue		EPL Volume 98, Number 3, May 2012


Article Number		31002
Number of page(s)		7
Section		The Physics of Elementary Particles and Fields
DOI		https://doi.org/10.1209/0295-5075/98/31002
Published online		08 May 2012

EPL, 98 (2012) 31002

Measurement of the forward charged-particle pseudorapidity density in pp collisions at $\chem{\sqrt{s} = 7\,{TeV}}$ with the TOTEM experiment

The TOTEM Collaboration
G. Antchev, P. Aspell⁸, I. Atanassov⁸, V. Avati⁸, J. Baechler⁸, V. Berardi^5b^,5a, M. Berretti^7b, E. Bossini^7b, M. Bozzo^6b^,6a, P. Brogi^7b, E. Brücken^3a^,3b, A. Buzzo^6a, F. S. Cafagna^5a, M. Calicchio^5b^,5a, M. G. Catanesi^5a, C. Covault⁹, M. Csanád⁴, T. Csörgő⁴, M. Deile⁸, K. Eggert⁹, V. Eremin, R. Ferretti^6a^,6b, F. Ferro^6a, A. Fiergolski, F. Garcia^3a, S. Giani⁸, V. Greco^7b^,8, L. Grzanka⁸, J. Heino^3a, T. Hilden^3a^,3b, M. R. Intonti^5a, J. Kašpar^1a^,8, J. Kopal^1a^,8, V. Kundrát^1a, K. Kurvinen^3a, S. Lami^7a, G. Latino^7b, R. Lauhakangas^3a, T. Leszko, E. Lippmaa², M. Lokajíček^1a, M. Lo Vetere^6b^,6a, F. Lucas Rodríguez⁸, M. Macrí^6a, L. Magaletti^5b^,5a, T. Mäki^3a, A. Mercadante^5b^,5a, N. Minafra⁸, S. Minutoli^6a, F. Nemes⁴, H. Niewiadomski⁸, E. Oliveri^7b, F. Oljemark^3a^,3b, R. Orava^3a^,3b, M. Oriunno⁸, K. Österberg^3a^,3b, P. Palazzi^7b, J. Procházka^1a, M. Quinto^5a, E. Radermacher⁸, E. Radicioni^5a, F. Ravotti⁸, E. Robutti^6a, L. Ropelewski⁸, G. Ruggiero⁸, H. Saarikko^3a^,3b, A. Santroni^6b^,6a, A. Scribano^7b, W. Snoeys⁸, J. Sziklai⁴, C. Taylor⁹, N. Turini^7b, V. Vacek^1b, M. Vitek^1b, J. Welti^3a^,3b and J. Whitmore¹⁰

^1a Institute of Physics of the Academy of Sciences of the Czech Republic - Praha, Czech Republic, EU
^1b Czech Technical University - Praha, Czech Republic, EU
² National Institute of Chemical Physics and Biophysics NICPB - Tallinn, Estonia, EU
^3a Helsinki Institute of Physics - Helsinki, Finland, EU
^3b Department of Physics, University of Helsinki - Helsinki, Finland, EU
⁴ MTA Wigner Research Center, RMKI - Budapest, Hungary, EU
^5a INFN Sezione di Bari - Bari, Italy, EU
^5b Dipartimento Interateneo di Fisica di Bari - Bari, Italy, EU
^6a Sezione INFN di Genova - Genova, Italy, EU
^6b Università degli Studi di Genova - Genova, Italy, EU
^7a INFN Sezione di Pisa - Pisa, Italy, EU
^7b Università degli Studi di Siena and Gruppo Collegato INFN di Siena - Siena, Italy, EU
⁸ CERN - Geneva, Switzerland
⁹ Case Western Reserve University, Department of Physics - Cleveland, OH, USA
¹⁰ Penn State University, Department of Physics - University Park, PA, USA

Received: 19 April 2012
Accepted: 25 April 2012

Abstract

The TOTEM experiment has measured the charged-particle pseudorapidity density dN_ch/dη in pp collisions at $\sqrt{s} = 7\,{\rm TeV}$ for 5.3<|η|<6.4 in events with at least one charged particle with transverse momentum above 40 MeV/c in this pseudorapidity range. This extends the analogous measurement performed by the other LHC experiments to the previously unexplored forward η region. The measurement refers to more than 99% of non-diffractive processes and to single and double diffractive processes with diffractive masses above ∼3.4 GeV/c², corresponding to about 95% of the total inelastic cross-section. The dN_ch/dη has been found to decrease with |η|, from 3.84 ± 0.01(stat) ± 0.37(syst) at |η|=5.375 to 2.38±0.01(stat)±0.21(syst) at |η|=6.375. Several MC generators have been compared to data; none of them has been found to fully describe the measurement.

PACS: 13.85.Hd – Inelastic scattering: many-particle final states / 13.85.Lg – Total cross sections

© EPLA, 2012

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