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Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/46987
Title: Transverse-Momentum and Pseudorapidity Distributions of Charged Hadrons in pp Collisions at √s=7  TeV
Authors: Khachatryan, V.; Cabrillo, I. J.; Calderón-Urrea, Alejandro; Chuang, S. H.; Diaz Merino, I.; Diez González, C.; Duarte Campderros, J.; Fernández, M.; Gómez, G.; González Sánchez, J.; González Suárez, R.; Jorda, C.; Lobelle Pardo, P.; López Virto, A.; Marco, Jesús; Marco, Rafael; Martínez-Rivero, Celso; Matorras, Francisco; Martínez Ruiz del Arbol, P.; Rodrigo, Teresa; Ruiz Jimeno, Alberto; Scodellaro, Luca; Sobron Sañudo, M.; Vila, Iván; Vilar, Rocío
Issue Date: Jul-2010
Publisher: American Physical Society
Citation: Physical Review Letters 105(2): 022002 (2010)
Abstract: Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at √s=7  TeV are measured with the inner tracking system of the CMS detector at the LHC. The charged-hadron yield is obtained by counting the number of reconstructed hits, hit pairs, and fully reconstructed charged-particle tracks. The combination of the three methods gives a charged-particle multiplicity per unit of pseudorapidity dNch/dη||η|<0.5=5.78±0.01(stat)±0.23(syst) for non-single-diffractive events, higher than predicted by commonly used models. The relative increase in charged-particle multiplicity from √s=0.9 to 7 TeV is [66.1±1.0(stat)±4.2(syst)]%. The mean transverse momentum is measured to be 0.545±0.005(stat)±0.015(syst)  GeV/c. The results are compared with similar measurements at lower energies.
Description: 14 páginas, 5 figuras, 2 tablas.-- Creative Commons Attribution 3.0 License.-- PACS numbers: 13.85.Ni.-- CMS Collaboration: et al.
Publisher version (URL): http://dx.doi.org/10.1103/PhysRevLett.105.022002
URI: http://hdl.handle.net/10261/46987
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.105.022002
E-ISSN: 1079-7114
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