Search for narrow resonances in dilepton mass spectra in pp collisions at root s=7 TeV CMS Collaboration
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
20/05/2014
20/05/2014
14/08/2012
|
Resumo |
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) A search for narrow, high-mass resonances decaying to electron or muon pairs has been performed using pp collision data collected at root s = 7 TeV by the CMS experiment in 2011. The data sample corresponds to an integrated luminosity of approximately 5 fb(-1). The event yields observed in the signal regions are consistent with predictions of the standard model backgrounds, and upper limits on the cross section times branching fraction for a resonance decaying to dileptons are extracted from a shape analysis of the dilepton invariant mass distribution. The resulting mass limits at 95% confidence level are 2330 GeV for the Z' in the Sequential Standard Model, 2000 GeV for the superstring-inspired Z'(psi) resonance, 890 (540) GeV for the Stueckelberg extension Z'(St) the mass parameter epsilon = 0.06 (0.04), and 2140 (1810) GeV for Kaluza-Klein gravitons with the coupling parameter k/(M) over bar (Pl) of 0.10 (0.05). These limits are the most stringent to date. (C) 2012 Elsevier B.V. All rights reserved. |
Formato |
158-179 |
Identificador |
http://dx.doi.org/10.1016/j.physletb.2012.06.051 Physics Letters B. Amsterdam: Elsevier B.V., v. 714, n. 2-5, p. 158-179, 2012. 0370-2693 http://hdl.handle.net/11449/24022 10.1016/j.physletb.2012.06.051 WOS:000307680100004 |
Idioma(s) |
eng |
Publicador |
Elsevier B.V. |
Relação |
Physics Letters B |
Direitos |
closedAccess |
Palavras-Chave | #CMS #Dileptons #Resonances |
Tipo |
info:eu-repo/semantics/article |