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Transverse-momentum and pseudorapidity distributions of charged hadrons in pp collisions at root s=0.9 and 2.36 TeV

Author(s)
Alver, Burak Han; Bendavid, Joshua L.; Busza, Wit; Butz, Erik M.; Cali, Ivan Amos; Chan, M.; D'Enterria, David; Everaerts, Pieter Bruno Bart; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hahn, Kristian Allan; Kim, Y.; Klute, Markus; Li, W.; Ma, Teng; Nahn, Steven; Paus, Christoph M. E.; Stephans, George S. F.; Sung, Kevin Kai Hong; Sung, Kevin Kai; Wenger, Edward Allen; Yilmaz, Yetkin; Yoon, A. S.; Zanetti, Marco; Lee, Yen-Jie; Loizides, Constantinos; Roland, Gunther M; Xie, Si; Bauer, Gerry P; Harris, Philip Coleman; Luckey Jr, P David; Roland, Christof E; Rudolph, Matthew Scott; Sumorok, Konstanty C; Wyslouch, Boleslaw; ... Show more Show less
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Abstract
Measurements of inclusive charged-hadron transverse-momentum and pseudorapidity distributions are presented for proton-proton collisions at s√=0.9 and 2.36 TeV. The data were collected with the CMS detector during the LHC commissioning in December 2009. For non-single-diffractive interactions, the average charged-hadron transverse momentum is measured to be 0.46 ± 0.01 (stat.) ± 0.01 (syst.) GeV/c at 0.9 TeV and 0.50 ± 0.01 (stat.) ± 0.01 (syst.) GeV/c at 2.36 TeV, for pseudorapidities between --2.4 and +2.4. At these energies, the measured pseudorapidity densities in the central region, dN [subscript ch]/dη|[subscript |η|]<0.5, are 3:48 ± 0:02 (stat.) ± 0.13 (syst.) and 4:47 ± 0:04 (stat.) ± 0.16 (syst.), respectively. The results at 0.9 TeV are in agreement with previous measurements and confirm the expectation of near equal hadron production in p−p and pp collisions. The results at 2.36 TeV represent the highest-energy measurements at a particle collider to date.
Date issued
2010-02
URI
http://hdl.handle.net/1721.1/75776
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag
Citation
CMS Collaboration et al. “Transverse-momentum and Pseudorapidity Distributions of Charged Hadrons in Pp Collisions at $\sqrt{s} = 0.9 $ and 2.36 TeV.” Journal of High Energy Physics 2010.2 (2010).
Version: Final published version
ISSN
1126-6708
1029-8479

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