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

Download Article PDF

Article metrics

3195 Total downloads

Permissions

Get permission to re-use this article

Author affiliations

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

Journal RSS

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.

Export citation and abstract BibTeX RIS

Previous article in issue

Next article in issue

Accepted by by R. Voss

Please wait… references are loading.