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Limits on the Higgs boson lifetime and width from its decay to four charged leptons

Articolo
Data di Pubblicazione:
2015
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 tau(H) < 1.9 x 10(-13) s at the 95% confidence level (C.L.), corresponding to a lower bound on the width of Gamma(H) > 3.5 x 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 f(Lambda Q) that expresses an anomalous coupling contribution as an on-shell cross-section fraction. The limit on the Higgs boson width is Gamma(H) < 46 MeV with f(Lambda Q) unconstrained and Gamma(H) < 26 MeV for f(Lambda Q) = 0 at the 95% C.L. The constraint f(Lambda Q) < 3.8 x 10(-3) at the 95% C.L. is obtained for the expected standard model Higgs boson width.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
Nuclear and High Energy Physics
Elenco autori:
Braghieri, Alessandro; Magnani, Alice; Montagna, PAOLO MARIA; Ratti, SERGIO PEPPINO; Riccardi, Cristina; Salvini, Paola; Vai, Ilaria; Vitulo, Paolo
Autori di Ateneo:
BRAGHIERI ALESSANDRO
MONTAGNA PAOLO MARIA
RICCARDI CRISTINA
SALVINI PAOLA
VAI ILARIA
VITULO PAOLO
Link alla scheda completa:
https://iris.unipv.it/handle/11571/1164526
Pubblicato in:
PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY
Journal
  • Dati Generali

Dati Generali

URL

http://journals.aps.org/prd/pdf/10.1103/PhysRevD.92.072010
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