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

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Title: Measurement of the forward charged-particle pseudorapidity density in pp collisions at root s=7TeV with the TOTEM experiment
Author: Antchev, G.; Brucken, E.; Garcia, F.; Heino, J.; Hilden, T.; Kurvinen, Leo Kari-Pekka; Lauhakangas, R.; Mäki, T.; Oljemark, F.; Orava, R.; Österberg, K.; Saarikko, H.; Welti, J.; TOTEM Collaboration
Citation: Antchev , G , Brucken , E , Garcia , F , Heino , J , Hilden , T , Kurvinen , L K-P , Lauhakangas , R , Mäki , T , Oljemark , F , Orava , R , Österberg , K , Saarikko , H , Welti , J & TOTEM Collaboration 2012 , ' Measurement of the forward charged-particle pseudorapidity density in pp collisions at root s=7TeV with the TOTEM experiment ' Europhysics Letters , vol 98 , no. 3 , pp. 31002 . , 10.1209/0295-5075/98/31002
Belongs to series: Europhysics Letters
ISSN: 0295-5075
Abstract: The TOTEM experiment has measured the charged-particle pseudorapidity density dNch/dη in pp collisions at \sqrt{s} = 7\,{\rm TeV} 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.
Peer review status: Peer reviewed
URI: http://hdl.handle.net/10138/37169
Date: 2012-05-08

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