Volume 98, Number 3, May 2012
|Number of page(s)||7|
|Section||The Physics of Elementary Particles and Fields|
|Published online||08 May 2012|
Measurement of the forward charged-particle pseudorapidity density in pp collisions at with the TOTEM experiment
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
Accepted: 25 April 2012
The TOTEM experiment has measured the charged-particle pseudorapidity density dNch/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 dNch/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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