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
Type :
Article
Publication Status :
Published
Access :
restrictedAccess
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-1fb-1 collected by the CMS experiment at the LHC in pppp collisions at a centre-of-mass energy of 8 TeVTeV . In order to separate the signal from the larger tt¯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, μμ , relative to the standard model prediction for a Higgs boson mass of 125 GeVGeV . The observed (expected) exclusion limit at a 95 % confidence level is μ<4.2μ<4.2 (3.3), corresponding to a best fit value μ^=1.2+1.6−1.5μ^=1.2−1.5+1.6 .
Source :
The European Physical Journal C
Date :
2015-06
Volume :
75
Issue :
6
Publisher :
Springer Nature
URI
http://hdl.handle.net/10679/4446http://link.springer.com/article/10.1140/epjc/s10052-015-3454-1
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