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Search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks using a matrix element method

Abstract: A search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks is presented. Events with hadronic jets and one or two oppositely charged leptons are selected from a data sample corresponding to an integrated luminosity of 19.5 fb-1 collected by the CMS experiment at the LHC in pp collisions at a centre-of-mass energy of 8 TeV. In order to separate the signal from the larger tt¯ + jets background, this analysis uses a matrix element method that assigns a probability density value to each reconstructed event under signal or background hypotheses. The ratio between the two values is used in a maximum likelihood fit to extract the signal yield. The results are presented in terms of the measured signal strength modifier, µ, relative to the standard model prediction for a Higgs boson mass of 125 GeV. The observed (expected) exclusion limit at a 95 % confidence level is µ<4.2 (3.3), corresponding to a best fit value µ^=1.2+1.6-1.5.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: European Physical Journal C, Vol. 75, Num. 6, Art. Num. 251, (2015)

Editorial: Springer New York LLC

 Fecha de publicación: 01/06/2015

Nº de páginas: 28

Tipo de publicación: Artículo de Revista

 DOI: 10.1140/epjc/s10052-015-3454-1

ISSN: 1434-6044,1434-6052

Proyecto español: FPA2014-55295-C3-1-R ; FPA 2011-28694-C02-01

Url de la publicación: https://doi.org/10.1140/epjc/s10052-015-3454-1