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


CMS Collaboration; Khachatryan, V; Sirunyan, A M; Tumasyan, A; Aarrestad, T K; Amsler, C; Caminada, L; Canelli, F; Chiochia, V; De Cosa, A; Galloni, C; Hinzmann, A; Hreus, T; Kilminster, B; Lange, C; Ngadiuba, J; Pinna, D; Robmann, P; Ronga, F J; Salerno, D; Yang, Y; et al (2015). Limits on the Higgs boson lifetime and width from its decay to four charged leptons. Physical Review D (Particles, Fields, Gravitation and Cosmology), 92:072010.

Abstract

Constraints on the lifetime and width of the Higgs boson are obtained from $H$ to $ZZ$ to 4 lepton events using data recorded by the CMS experiment during the LHC run 1 with an integrated luminosity of 5.1 and 19.7 inverse femtobarns 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 $\tau_H$ < 1.9E-13 s at the 95% confidence level (CL), corresponding to a lower bound on the width of Gamma[H] &gt; 3.5E-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[LQ] 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[LQ] unconstrained and Gamma[H] < 26 MeV for f[LQ] = 0 at the 95% CL. The constraint f[LQ] < 3.8E-3 at the 95% CL is obtained for the expected standard model Higgs boson width.

Abstract

Constraints on the lifetime and width of the Higgs boson are obtained from $H$ to $ZZ$ to 4 lepton events using data recorded by the CMS experiment during the LHC run 1 with an integrated luminosity of 5.1 and 19.7 inverse femtobarns 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 $\tau_H$ < 1.9E-13 s at the 95% confidence level (CL), corresponding to a lower bound on the width of Gamma[H] &gt; 3.5E-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[LQ] 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[LQ] unconstrained and Gamma[H] < 26 MeV for f[LQ] = 0 at the 95% CL. The constraint f[LQ] < 3.8E-3 at the 95% CL is obtained for the expected standard model Higgs boson width.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:19 February 2015
Deposited On:18 Feb 2016 11:57
Last Modified:05 Apr 2016 20:08
Publisher:American Physical Society
ISSN:1550-7998
Publisher DOI:https://doi.org/10.1103/PhysRevD.92.072010
Other Identification Number:arXiv:1507.06656v2

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