Measurement of the forward charged-particle pseudorapidity density in pp collisions at √s = 7 TeV with the TOTEM experiment

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Abstract

The TOTEM experiment has measured the charged-particle pseudorapidity density dN ch/dη in pp collisions at 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/c 2, 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.

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

Titolo volume/Rivista

EUROPHYSICS LETTERS

Anno di pubblicazione

2012

ISSN

0295-5075

ISBN

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Numero di citazioni Wos

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Codici ASJC

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