Measurement of the forward charged particle pseudorapidity density in pp collisions at sqrt(s) = 8 TeV using a displaced interaction point

G. Antchev, P. Aspell,I. Atanassov,V. Avati,J. Baechler,V. Berardi,M. Berretti,E. Bossini,U. Bottigli,M. Bozzo,E. Brücken,A. Buzzo,F. Cafagna,M. G. Catanesi,C. E. Covault,M. Csanád,T. Csörgő,M. Deile,Martin Doubek,K. Eggert,V. Eremin,F. Ferro,A. Fiergolski, F. H. Garcia,Vjačeslav Georgiev,S. Gianí,L. Grzanka,J. Hammerbauer, J. Heino,T. E. Hilden,A. Karev,J. Kašpar,J. Kopal,V. Kundrát,S. Lami,G. Latino,R. Lauhakangas,T. Leszko,É. Lippmaa,J. Lippmaa,M. Lokajíček,L. Losurdo,M. Lo Vetere,F. Lucas Rodríguez,M. Macrı̀,T. Mäki,A. Mercadante,N. Minafra,S. Minutoli,F. Nemes,H. Niewiadomski,E. Oliveri,F. Oljemark,R. Orava,M. Oriunno,K. Österberg,P. Palazzi,Zdeněk Peroutka,J. Procházka,M. Quinto,E. Radermacher,E. Radicioni,F. Ravotti,E. Robutti,L. Ropelewski,G. Ruggiero,H. Saarikko,A. Scribano,J. Smajek,W. Snoeys,J. Sziklai,C. Taylor,N. Turini,V. Vacek,J. Welti,J. Whitmore,P. Wyszkowski,Krzysztof Zieliński

arXiv (Cornell University)（2014）

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Abstract

The pseudorapidity density of charged particles dN(ch)/deta is measured by the TOTEM experiment in pp collisions at sqrt(s) = 8 TeV within the range 3.9 0 MeV/c, produced in inelastic interactions with at least one charged particle in -7 < eta < -6 or 3.7 < eta <4.8 . The dN(ch)/deta has been found to decrease with |eta|, from 5.11 +- 0.73 at eta = 3.95 to 1.81 +- 0.56 at eta= - 6.925. Several MC generators are compared to the data and are found to be within the systematic uncertainty of the measurement.

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Key words

particle pseudorapidity density,pp collisions

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