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

The TOTEM Collaboration; 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

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

The TOTEM Collaboration, G. Antchev, P. Aspell¹³, I. Atanassov¹³, V. Avati¹³, J. Baechler¹³, V. Berardi^7,8, M. Berretti¹², E. Bossini¹², M. Bozzo^9,10, P. Brogi¹², E. Brücken^4,5, A. Buzzo⁹, F. S. Cafagna⁷, M. Calicchio^7,8, M. G. Catanesi⁷, C. Covault¹⁴, M. Csanád⁶, T. Csörgő⁶, M. Deile¹³, K. Eggert¹⁴, V. Eremin, R. Ferretti^9,10, F. Ferro⁹, A. Fiergolski, F. Garcia⁴, S. Giani¹³, V. Greco^12,13, L. Grzanka¹³, J. Heino⁴, T. Hilden^4,5, M. R. Intonti⁷, J. Kašpar^1,13, J. Kopal^1,13, V. Kundrát¹, K. Kurvinen⁴, S. Lami¹¹, G. Latino¹², R. Lauhakangas⁴, T. Leszko, E. Lippmaa³, M. Lokajíček¹, M. Lo Vetere^9,10, F. Lucas Rodríguez¹³, M. Macrí⁹, L. Magaletti^7,8, T. Mäki⁴, A. Mercadante^7,8, N. Minafra¹³, S. Minutoli⁹, F. Nemes⁶, H. Niewiadomski¹³, E. Oliveri¹², F. Oljemark^4,5, R. Orava^4,5, M. Oriunno¹³, K. Österberg^4,5, P. Palazzi¹², J. Procházka¹, M. Quinto⁷, E. Radermacher¹³, E. Radicioni⁷, F. Ravotti¹³, E. Robutti⁹, L. Ropelewski¹³, G. Ruggiero¹³, H. Saarikko^4,5, A. Santroni^9,10, A. Scribano¹², W. Snoeys¹³, J. Sziklai⁶, C. Taylor¹⁴, N. Turini¹², V. Vacek², M. Vitek², J. Welti^4,5 and J. Whitmore¹⁵

Published 8 May 2012 • Europhysics Letters Association
Europhysics Letters, Volume 98, Number 3 Citation The TOTEM Collaboration et al 2012 EPL 98 31002 DOI 10.1209/0295-5075/98/31002

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¹ Institute of Physics of the Academy of Sciences of the Czech Republic - Praha, Czech Republic, EU

² Czech Technical University - Praha, Czech Republic, EU

³ National Institute of Chemical Physics and Biophysics NICPB - Tallinn, Estonia, EU

⁴ Helsinki Institute of Physics - Helsinki, Finland, EU

⁵ Department of Physics, University of Helsinki - Helsinki, Finland, EU

⁶ MTA Wigner Research Center, RMKI - Budapest, Hungary, EU

⁷ INFN Sezione di Bari - Bari, Italy, EU

⁸ Dipartimento Interateneo di Fisica di Bari - Bari, Italy, EU

⁹ Sezione INFN di Genova - Genova, Italy, EU

¹⁰ Università degli Studi di Genova - Genova, Italy, EU

¹¹ INFN Sezione di Pisa - Pisa, Italy, EU

¹² Università degli Studi di Siena and Gruppo Collegato INFN di Siena - Siena, Italy, EU

¹³ CERN - Geneva, Switzerland

¹⁴ Case Western Reserve University, Department of Physics - Cleveland, OH, USA

¹⁵ Penn State University, Department of Physics - University Park, PA, USA

¹⁶ INRNE-BAS, Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences - Sofia, Bulgaria, EU.

¹⁷ Ioffe Physical-Technical Institute of Russian Academy of Sciences - St Petersburg, Russian Federation.

¹⁸ Warsaw University of Technology - Warsaw, Poland, EU.

¹⁹ Institute of Nuclear Physics, Polish Academy of Sciences - Cracow, Poland, EU.

²⁰ Department of Atomic Physics, ELTE University - Budapest, Hungary, EU.

²¹ SLAC National Accelerator Laboratory - Stanford, CA, USA.

Dates

Received 19 April 2012
Accepted 25 April 2012
Published 8 May 2012

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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/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.

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