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

CMS Collaboration

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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.
Original languageEnglish
Article number072010
Number of pages28
JournalPhysical Review D
Issue number7
Publication statusPublished - 2015
Externally publishedYes


  • Higgs bosons
  • Boson pair
  • Standard model (particle physics)

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