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

EPL (Europhysics Letters) Pub Date : 2012-05-08 DOI:10.1209/0295-5075/98/31002

G. Antchev, P. Aspell, I. Atanassov, I. Atanassov, V. Avati, J. Baechler, V. Berardi, M. Berretti, E. Bossini, M. Bozzo, P. Brogi, E. Brücken, A. Buzzo, F. Cafagna, M. Calicchio, M. Catanesi, C. Covault, M. Csanád, T. Csörgő, M. Deile, K. Eggert, V. Eremin, R. Ferretti, F. Ferro, A. Fiergolski, F. García, S. Giani, V. Greco, V. Greco, L. Grzanka, L. Grzanka, J. Heino, T. Hildén, M. Intonti, J. Kašpar, J. Kopal, V. Kundr'at, K. Kurvinen, S. Lami, G. Latino, R. Lauhakangas, T. Leszko, É. Lippmaa, M. Lokajicek, M. Vetere, F. L. Rodríguez, M. Macr'i, L. Magaletti, T. Mäki, A. Mercadante, N. Minafra, S. Minutoli, F. Nemes, F. Nemes, H. Niewiadomski, E. Oliveri, F. Oljemark, R. Orava, M. Oriunno, M. Oriunno, K. Osterberg, P. Palazzi, J. Proch'azka, 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

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引用次数: 58

Abstract

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.

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用TOTEM实验测量√s = 7 TeV pp碰撞中正向带电粒子的赝快度密度

在此伪快度范围内，至少有一个横向动量大于40 MeV/c的带电粒子发生碰撞，在5.3<|η|<6.4时，TOTEM实验测量了pp碰撞中带电粒子的伪快度密度dNch/dη。这将其他大型强子对撞机实验进行的类似测量扩展到以前未探索的前向η区。该测量涉及99%以上的非衍射过程和衍射质量在~ 3.4 GeV/c2以上的单衍射和双衍射过程，约占总非弹性截面的95%。dNch/dη随η值的增大而减小，从η =5.375时的3.84±0.01(stat)±0.37(syst)降至η =6.375时的2.38±0.01(stat)±0.21(syst)。几个MC生成器已与数据进行了比较;没有一个能完全描述测量结果。

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