Sqrt{s} = 7 TeV 与TOTEM 实验相撞的pp碰撞中测测前载电粒粒子伪快速密度= 7 TeV (Measurement of the forward charged particle pseudorapidity density in pp collisions at sqrt{s} = 7 TeV with the TOTEM experiment)

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

from arxiv, 7 pages, 3 figures

The TOTEM experiment has measured the charged particle pseudorapidity density dN_{ch}/deta in pp collisions at sqrt{s} = 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% of non-diffractive processes and to single and double diffractive processes with diffractive masses above ~3.4 GeV/c^2, corresponding to about 95% of the total inelastic cross-section. The 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.

翻译：TOTEM 实验测量了在 sqrt{s} = 7 TeV 碰撞的 page颗粒充电伪反应密度 dN ⁇ ch}/deta 在5.3 ⁇ eta} = 7 TeV = 5.3 ⁇ eta} 6.4 在这种伪适应范围中,至少一个充电颗粒的反向动力超过40兆V/c。这把其他LHC 实验进行的类似测量扩大到先前尚未勘探的 eta 区域。测量是指99%以上的非阻力过程,以及大于 3.4 GeV/c ⁇ 2 的单体和双体阻力过程,相当于无弹性截面总截面的95%。 dN ⁇ ch}/deta(deta) 已经发现,在 ⁇ eta = 5.84 pm 0.01 pm 0.37 (syst) = 5.375 pm 0.01 (stat) pm 0.21 (syst) = 6.75 上, 数台MC 发电机与数据进行了比较;没有发现,但没有发现这些发电机与数据作充分描述。