Measurement of Higgs boson production and properties in the WW decay channel with leptonic final states

Measurement of Higgs boson production and properties in the WW decay channel with leptonic final states

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A search for the standard model Higgs boson decaying to a W-boson pair at the LHC is reported. The event sample corresponds to an integrated luminosity of 4.9 fb[superscript −1] and 19.4 fb[superscript −1] collected with the CMS detector in pp collisions at √s = 7 and 8 TeV, respectively. The Higgs...

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Bibliographic Details
Main Authors: Apyan, Aram, Busza, Wit, Cali, Ivan Amos, Chan, M., Di Matteo, Leonardo, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Gulhan, Doga Can, Klute, Markus, Lai, Yue Shi, Ma, Teng, Paus, Cristoph M. E., Ralph, Duncan Kelley, Roland, Cristof E., Stephans, George S. F., Velicanu, Dragos Alexandru, Veverka, Jan, Wyslouch, Boleslaw, Yoon, A. S., Zanetti, Marco, Paus, Christoph M. E., Barbieri, Richard Alexander, Bauer, Gerry P, Dutta, Valentina, Lee, Yen-Jie, Levin, Andrew Michael, Luckey Jr, P David, Roland, Gunther M, Stoeckli, Fabian, Sumorok, Konstanty C, Yang, Mingming, Wyslouch, Victoria, Roland, Christof E
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: Springer-Verlag 2014
Online Access:http://hdl.handle.net/1721.1/87671
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0001-6332-5839
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0002-1260-777X
https://orcid.org/0000-0002-6047-4211
https://orcid.org/0000-0002-7945-005X
https://orcid.org/0000-0003-3681-0649
https://orcid.org/0000-0002-9418-6656
https://orcid.org/0000-0003-1486-606X
https://orcid.org/0000-0003-2593-7767
https://orcid.org/0000-0001-9236-6621
https://orcid.org/0000-0002-0869-5631
https://orcid.org/0000-0002-1136-6900
Description
Summary:A search for the standard model Higgs boson decaying to a W-boson pair at the LHC is reported. The event sample corresponds to an integrated luminosity of 4.9 fb[superscript −1] and 19.4 fb[superscript −1] collected with the CMS detector in pp collisions at √s = 7 and 8 TeV, respectively. The Higgs boson candidates are selected in events with two or three charged leptons. An excess of events above background is observed, consistent with the expectation from the standard model Higgs boson with a mass of around 125 GeV. The probability to observe an excess equal or larger than the one seen, under the background-only hypothesis, corresponds to a significance of 4.3 standard deviations for m [subscript H] = 125.6 GeV. The observed signal cross section times the branching fraction to WW for m [subscript H] = 125.6 GeV is 0.72[+0.20 over −0.18] times the standard model expectation. The spin-parity J [superscript P] = 0[superscript +] hypothesis is favored against a narrow resonance with J [superscript P] = 2[superscript +] or J [superscript P] = 0[superscript −] that decays to a W-boson pair. This result provides strong evidence for a Higgs-like boson decaying to a W-boson pair.

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