Constraints on the lifetime and width of the Higgs boson are obtained from H --> ZZ --> 4l events using data recorded by the CMS experiment during the LHC run 1 with an integrated luminosity of 5.1 and 19.7 fb-1 at a center-of-mass energy of 7 and 8 TeV, respectively. The measurement of the Higgs boson lifetime is derived from its flight distance in the CMS detector with an upper bound of tauH< 1.9*10-13 s at the 95% confidence level (C.L.), corresponding to a lower bound on the width of Gamma_H>3.5*10-9 MeV. The measurement of the width is obtained from an off-shell production technique, generalized to include anomalous couplings of the Higgs boson to two electroweak bosons. From this measurement, a joint constraint is set on the Higgs boson width and a parameter fΛQ that expresses an anomalous coupling contribution as an on-shell cross-section fraction. The limit on the Higgs boson width is ΓH<46 MeV with f LambdaQ unconstrained and GammaH<26 MeV for fLambdaQ=0 at the 95% C.L. The constraint fLambdaQ<3.8*10-3 at the 95% C.L. is obtained for the expected standard model Higgs boson width.
Limits on the Higgs boson lifetime and width from its decay to four charged leptons
Sola, V.;AMAPANE, Nicola Carlo;ARGIRO', Stefano;BELLAN, Riccardo;COSTA, Marco;COVARELLI, Roberto;MIGLIORE, Ernesto;MONACO, Vincenzo;OBERTINO, Maria Margherita;ROMERO, Alessandra;SACCHI, Roberto;SOLANO, Ada Maria;
2015-01-01
Abstract
Constraints on the lifetime and width of the Higgs boson are obtained from H --> ZZ --> 4l events using data recorded by the CMS experiment during the LHC run 1 with an integrated luminosity of 5.1 and 19.7 fb-1 at a center-of-mass energy of 7 and 8 TeV, respectively. The measurement of the Higgs boson lifetime is derived from its flight distance in the CMS detector with an upper bound of tauH< 1.9*10-13 s at the 95% confidence level (C.L.), corresponding to a lower bound on the width of Gamma_H>3.5*10-9 MeV. The measurement of the width is obtained from an off-shell production technique, generalized to include anomalous couplings of the Higgs boson to two electroweak bosons. From this measurement, a joint constraint is set on the Higgs boson width and a parameter fΛQ that expresses an anomalous coupling contribution as an on-shell cross-section fraction. The limit on the Higgs boson width is ΓH<46 MeV with f LambdaQ unconstrained and GammaH<26 MeV for fLambdaQ=0 at the 95% C.L. The constraint fLambdaQ<3.8*10-3 at the 95% C.L. is obtained for the expected standard model Higgs boson width.File | Dimensione | Formato | |
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PhysRevD.92.072010.pdf
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