Measurement of the forward charged particle pseudorapidity density in pp collisions at sqrts = 7 TeV with the TOTEM experiment release_x5r2gbhvuncolguowbesztegcq

by 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 (+58 others)

Released as a article .

2012  

Abstract

The TOTEM experiment has measured the charged particle pseudorapidity density dN_ch/deta in pp collisions at sqrts = 7 TeV for 5.3<|eta|<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 eta region. The measurement refers to more than 99 and double diffractive processes with diffractive masses above 3.4 GeV/c^2, corresponding to about 95 dN_ch/deta has been found to decrease with |eta|, from 3.84 pm 0.01(stat) pm 0.37(syst) at |eta| = 5.375 to 2.38 pm 0.01(stat) pm 0.21(syst) at |eta| = 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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Date   2012-05-18
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arXiv  1205.4105v1
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