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

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 tH<1.9×10-13??s at the 95% confidence level (C.L.), corresponding to a lower bound on the width of GH>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 f?Q that expresses an anomalous coupling contribution as an on-shell cross-section fraction. The limit on the Higgs boson width is GH<46??MeV with f?Q unconstrained and GH<26??MeV for f?Q=0 at the 95% C.L. The constraint f?Q<3.8×10-3 at the 95% C.L. is obtained for the expected standard model Higgs boson width.

 Fuente: Phys. Rev. D, Vol. 92, Num. 10, Pag. 072010 (2015)

 Publisher: American Physical Society

 Publication date: 01/10/2015

 No. of pages: 28

 Publication type: Article

 DOI: 10.1103/PhysRevD.92.072010

 ISSN: 1550-7998,1550-2368,2470-0010,2470-0029

 Spanish project: FPA2014-55295-C3-1-R ; FPA 2011-28694-C02-01

 Publication Url: https://doi.org/10.1103/PhysRevD.92.072010

Authorship

KHACHATRYAN, VLADIMIR

JUAN RAMON CASTIÑEIRAS DE SAA

PABLO DE CASTRO MANZANO

MARCOS FERNANDEZ GARCIA

ALBERTO GRAZIANO

MARIA AMPARO LOPEZ VIRTO

RAFAEL JOSE MARCO DE LUCAS

FRANCISCA JAVIELA MUÑOZ SANCHEZ

ANA YAIZA RODRIGUEZ MARRERO