Artigo
Measurements of differential cross sections of Z/gamma* plus jets plus X events in p(p)over-bar collisions at root s=1.96 TeV
Fecha
2009-07-06Registro en:
Physics Letters B. Amsterdam: Elsevier B.V., v. 678, n. 1, p. 45-54, 2009.
0370-2693
10.1016/j.physletb.2009.05.058
WOS:000267816100008
Autor
Joint Inst Nucl Res
Centro Brasileiro de Pesquisas Físicas (CBPF)
Universidade do Estado do Rio de Janeiro (UERJ)
Universidade Federal do ABC (UFABC)
Universidade Estadual Paulista (Unesp)
Univ Alberta
Simon Fraser Univ
York Univ
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Univ Sci & Technol China
Universidad de los Andes
Charles Univ Prague
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Acad Sci Czech Republic
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CEA
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CINVESTAV
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Radboud Univ Nijmegen
Institute for Theoretical and Experimental Physics (ITEP)
Moscow MV Lomonosov State Univ
Inst High Energy Phys
Petersburg Nucl Phys Inst
Uppsala Univ
Stockholm Univ
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Univ London Imperial Coll Sci Technol & Med
University of Manchester
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Resumen
We present cross section measurements for Z/gamma* + jets + X production, differential in the transverse momenta of the three leading jets. The data sample was collected with the do detector at the Fermilab Tevatron p (p) over bar collider at a center-of-mass energy of 1.96 TeV and corresponds to an integrated luminosity of 1 fb(-1). Leading and next-to-leading order perturbative QCD predictions are compared with the measurements. and agreement is found within the theoretical and experimental uncertainties. We also make comparisons with the predictions of four event generators. Two parton-shower-based generators show significant shape and normalization differences with respect to the data. In contrast, two generators combining tree-level matrix elements with a parton shower give a reasonable description of the shapes observed in data. but the predicted normalizations show significant differences with respect to the data, reflecting large scale Uncertainties. For specific choices of scales, the normalizations for either generator can be made to agree with the measurements. (C) 2009 Elsevier B.V. All rights reserved.