Artículos de revistas
Search for s channel single top quark production in pp collisions at root s=7 and 8 TeV
Fecha
2016-09-06Registro en:
Journal Of High Energy Physics. New York: Springer, n. 9, 40 p., 2016.
1029-8479
10.1007/JHEP09(2016)027
WOS:000383024500001
WOS000383024500001.pdf
Autor
Yerevan Phys Inst
Inst Hochenergiephys OeAW
Natl Ctr Particle & High Energy Phys
Univ Antwerp
Vrije Univ Brussel
Univ Libre Bruxelles
Univ Ghent
Catholic Univ Louvain
Univ Mons
Ctr Brasileiro Pesquisas Fis
Universidade do Estado do Rio de Janeiro (UERJ)
Universidade Estadual Paulista (Unesp)
Universidade Federal do ABC (UFABC)
Inst Nucl Energy Res
Univ Sofia
Inst High Energy Phys
Peking Univ
Univ Los Andes
Univ Split
Inst Rudjer Boskov
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Charles Univ Prague
Egyptian Network High Energy Phys
NICPB
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Helsinki Inst Phys
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DESY
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Wigner Res Ctr Phys
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Institución
Resumen
A search is presented for single top quark production in the s channel in proton-proton collisions with the CMS detector at the CERN LHC in decay modes of the top quark containing a muon or an electron in the final state. The signal is extracted through a maximum-likelihood fit to the distribution of a multivariate discriminant defined using boosted decision trees to separate the expected signal contribution from background processes. The analysis uses data collected at centre-of-mass energies of 7 and 8 TeV and corresponding to integrated luminosities of 5.1 and 19.7 fb(-1), respectively. The measured cross sections of 7.1 +/- 8.1 pb (at 7 TeV) and 13.4 +/- 7.3 pb (at 8 TeV) result in a best fit value of 2.0 +/- 0.9 for the combined ratio of the measured and expected values. The signal significance is 2.5 standard deviations, and the upper limit on the rate relative to the standard model expectation is 4.7 at 95% confidence level.