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Open Access item Upsilon production cross section in pp collisions at √s=7  TeV

Authors:Khachatryan, V.
Brochero Cifuentes, J. A.
Cabrillo, I. J.
Calderón, A.
Chamizo Llatas, M.
Chuang, S. H.
Duarte Campderros, J.
Felcini, M.
Fernández, M.
Gómez, G.
González Sánchez, J.
Jorda, C.
Lobelle Pardo, P.
López Virto, A.
Marco, Jesús
Marco, Rafael
Martínez-Rivero, Celso
Matorras, Francisco
Muñoz Sánchez, F. J.
Piedra, Jonatan
Rodrigo, Teresa
Ruiz Jimeno, Alberto
Scodellaro, Luca
Sobron Sañudo, M.
Vila, Iván
Vilar, Rocío
Issue Date:Jun-2011
Publisher:American Physical Society
Citation:Physical Review D 83(11): 112004 (2011)
Abstract:The Υ(1S), Υ(2S), and Υ(3S) production cross sections in proton-proton collisions at √s=7  TeV are measured using a data sample collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 3.1±0.3  pb-1. Integrated over the rapidity range |y|<2, we find the product of the Υ(1S) production cross section and branching fraction to dimuons to be σ(pp→Υ(1S)X)·B(Υ(1S)→μ+μ-)=7.37±0.13-0.42+0.61±0.81  nb, where the first uncertainty is statistical, the second is systematic, and the third is associated with the estimation of the integrated luminosity of the data sample. This cross section is obtained assuming unpolarized Υ(1S) production. With the assumption of fully transverse or fully longitudinal production polarization, the measured cross section changes by about 20%. We also report the measurement of the Υ(1S), Υ(2S), and Υ(3S) differential cross sections as a function of transverse momentum and rapidity.
Description:27 páginas, 10 figuras, 9 tablas.-- PACS numbers: 13.85.Ni, 14.40.Pq.-- Creative Commons Attribution 3.0 License.-- CMS Collaboration: et al.
Publisher version (URL):http://dx.doi.org/10.1103/PhysRevD.83.112004
URI:http://hdl.handle.net/10261/46990
ISSN:1550-7998
E-ISSNmetadata.dc.identifier.doi = DOI:1550-2368
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Appears in Collections:(IFCA) Artículos

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