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Published September 7, 2014 | Submitted + Published
Journal Article Open

Constraints on the Higgs boson width from off-shell production and decay to Z-boson pairs


Constraints are presented on the total width of the recently discovered Higgs boson, ΓH, using its relative on-shell and off-shell production and decay rates to a pair of Z bosons, where one Z boson decays to an electron or muon pair, and the other to an electron, muon, or neutrino pair. The analysis is based on the data collected by the CMS experiment at the LHC in 2011 and 2012, corresponding to integrated luminosities of 5.1 fb^−15.1 fb^−1 at a center-of-mass energy √s = 7 TeV and 19.7 fb^−119.7 fb^−1 at √s = 8 TeV. A simultaneous maximum likelihood fit to the measured kinematic distributions near the resonance peak and above the Z-boson pair production threshold leads to an upper limit on the Higgs boson width of ΓH<22 MeV at a 95% confidence level, which is 5.4 times the expected value in the standard model at the measured mass of mH=125.6 GeV.

Additional Information

©2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/). Funded by SCOAP3. Received 14 May 2014; Received in revised form 12 June 2014; Accepted 30 June 2014; Available online 3 July 2014. We wish to thank our theoretician colleagues and in particular Fabrizio Caola for providing the theoretical uncertainty in the gg →ZZ background K factor, Tobias Kasprzik for providing the numerical calculations on the EW corrections for the qq→ZZ background process, Giampiero Passarino for his calculations of the mZZ-dependent K factor and its variations with renormalization and factorization scales, and Marco Zaro for checking the independence on mZZ of higher-order corrections in VBF processes. We also gratefully acknowledge Alessandro Ballestrero, John Campbell, Keith Ellis, Stefano Forte, Nikolas Kauer, Kirill Melnikov, and Ciaran Williams for their help in optimizing the Monte Carlo generators for this analysis. We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centers and personnel of the Worldwide LHC Computing Grid for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC and the CMS detector provided by the following funding agencies: BMWF and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIEN-CIAS (Colombia); MSES and CSF (Croatia); RPF (Cyprus); MoER, SF0690030s09 and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NIH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF and WCU (Republic of Korea); LAS (Lithuania); MOE and UM (Malaysia); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS and RFBR (Russia); MESTD (Serbia); SEIDI and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); ThEPCenter, IPST, STAR and NSTDA (Thai-land); TUBITAK and TAEK (Turkey); NASU and SFFR (Ukraine); STFC (United Kingdom); DOE and NSF (USA).

Attached Files

Published - 1-s2.0-S0370269314004821-main.pdf

Submitted - 1405.3455v2.pdf


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