Please use this identifier to cite or link to this item: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/2297
Title: 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
Authors: CMS Collaboration
Khachatryan, V.
SHARMA, SEEMA et al.
Dept. of Physics
Keywords: Standard model Higgs
Matrix element method
Measurements performed
2015
Issue Date: Jun-2015
Publisher: Springer Nature
Citation: European Physical Journal C, 75, 251.
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 19.5fb-1 collected by the CMS experiment at the LHC in pp collisions at a centre-of-mass energy of 8TeV. 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 125GeV. 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.
URI: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/2297
https://doi.org/10.1140/epjc/s10052-015-3454-1
ISSN: 1434-6044
1434-6044
Appears in Collections:JOURNAL ARTICLES

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