Limits on the Higgs boson lifetime and width from its decay to four charged leptons
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 τH<1.9×10-13 s at the 95% confidence level (C.L.), corresponding to a lower bound on the width of ΓH>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 fΛQ unconstrained and ΓH<26 MeV for fΛQ=0 at the 95% C.L. The constraint fΛQ<3.8×10-3 at the 95% C.L. is obtained for the expected standard model Higgs boson width.
arXiv_1507.06656.pdf
openaccess
1.14 MB
Adobe PDF
768fc5a774e866b2c566cb31a744c396
openaccess_PhysRevD_92_072010.pdf
openaccess
804.53 KB
Adobe PDF
7e3505c694d7bddf3ca1824b99b2f07a