Measurement of associated production of vector bosons and top quark-antiquark pairs in pp collisions at √s=7 TeV
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
27/05/2014
27/05/2014
25/04/2013
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Resumo |
The first measurement of vector-boson production associated with a top quark-antiquark pair in proton-proton collisions at √s=7 TeV is presented. The results are based on a data set corresponding to an integrated luminosity of 5.0 fb-1, recorded by the CMS detector at the LHC in 2011. The measurement is performed in two independent channels through a trilepton analysis of tt̄Z events and a same-sign dilepton analysis of tt̄V (V=W or Z) events. In the trilepton channel a direct measurement of the tt̄Z cross section σtt̄Z=0.28-0.11+0.14 (stat)-0.03+0.06 (syst) pb is obtained. In the dilepton channel a measurement of the tt̄V cross section yields σtt̄V=0.43-0.15+0.17 (stat)-0.07+0.09 (syst) pb. These measurements have a significance, respectively, of 3.3 and 3.0 standard deviations from the background hypotheses and are compatible, within uncertainties, with the corresponding next-to-leading order predictions of 0.137-0.016+0.012 and 0.306-0.053+0.031 pb. © 2013 CERN. Published by the American Physical Society. |
Identificador |
http://dx.doi.org/10.1103/PhysRevLett.110.172002 Physical Review Letters, v. 110, n. 17, 2013. 0031-9007 1079-7114 http://hdl.handle.net/11449/75168 10.1103/PhysRevLett.110.172002 WOS:000318188100004 2-s2.0-84876986000 2-s2.0-84876986000.pdf |
Idioma(s) |
eng |
Relação |
Physical Review Letters |
Direitos |
closedAccess |
Palavras-Chave | #CMS detectors #Direct measurement #Independent channels #Integrated luminosity #Next-to-leading orders #Production of #Proton proton collisions #Standard deviation #Bosons #High energy physics #Tellurium compounds #Uncertainty analysis |
Tipo |
info:eu-repo/semantics/article |