Search for a standard model-like Higgs boson in the μ[superscript +]μ[superscript −] and e[superscript +]e[superscript −] decay channels at the LHC
Name
Khachatryan-2015-Search for a standar.pdf
Size
950.7 KB
Format
Adobe PDF
Checksum (MD5)
e3abbe20f1747a134d727cbf55f50f72
Author(s)
Apyan, Aram
Barbieri, Richard Alexander
Busza, Wit
Cali, Ivan Amos
Di Matteo, Leonardo
Dutta, Valentina
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Gulhan, Doga Can
Klute, Markus
Date Issued
March 2015
Journal
Physics Letters B
Publisher
Elsevier
Citation
Khachatryan, V., et al. “Search for a Standard Model-Like Higgs Boson in the μ[superscript +]μ[superscript −] and e[superscript +]e[superscript −] Decay Channels at the LHC.” Physics Letters B 744 (May 2015): 184–207. © 2015
CERN for the benefit of the CMS Collaboration
Version
Final published version
Abstract
A search is presented for a standard model-like Higgs boson decaying to the μ[superscript +]μ[superscript −] or e[superscript +]e[superscript −] final states based on proton–proton collisions recorded by the CMS experiment at the CERN LHC. The data correspond to integrated luminosities of 5.0 fb[superscript −1] at a centre-of-mass energy of 7 TeV and 19.7 fb[superscript −1] at 8 TeV for the μ[superscript +]μ[superscript −] search, and of 19.7 fb[superscript −1] at 8 TeV for the e[superscript +]e[superscript −] search. Upper limits on the production cross section times branching fraction at the 95% confidence level are reported for Higgs boson masses in the range from 120 to 150 GeV. For a Higgs boson with a mass of 125 GeV decaying to μ[superscript +]μ[superscript −], the observed (expected) upper limit on the production rate is found to be 7.4 (6.5[+2.8 over −1.9]) times the standard model value. This corresponds to an upper limit on the branching fraction of 0.0016. Similarly, for e[superscript +]e[superscript −], an upper limit of 0.0019 is placed on the branching fraction, which is ≈3.7 × 10[superscript 5] times the standard model value. These results, together with recent evidence of the 125 GeV boson coupling to τ-leptons with a larger branching fraction consistent with the standard model, confirm that the leptonic couplings of the new boson are not flavour-universal.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. School of Science
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1016/j.physletb.2015.03.048
