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Title: Transverse-Momentum and Pseudorapidity Distributions of Charged Hadrons in pp Collisions at √s=7  TeV
Authors: Khachatryan, V., Cabrillo, I. J., Calderón, A., 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
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
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Citation: Physical Review Letters 105(2): 022002 (2010)
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