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Evidence for the 125 GeV Higgs boson decaying to a pair of $$\tau$$ leptons

Journal Article · · Journal of High Energy Physics (Online)

A search for a standard model Higgs boson decaying into a pair of tau leptons is performed using events recorded by the CMS experiment at the LHC in 2011 and 2012. The dataset corresponds to an integrated luminosity of 4.9 inverse femtobarns at a centre-of-mass energy of 7 TeV and 19.7 inverse femtobarns at 8 TeV. Each tau lepton decays hadronically or leptonically to an electron or a muon, leading to six different final states for the tau-lepton pair, all considered in this analysis. An excess of events is observed over the expected background contributions, with a local significance larger than 3 standard deviations for m[H] values between 115 and 130 GeV. The best fit of the observed H to tau tau signal cross section for m[H] = 125 GeV is 0.78 +- 0.27 times the standard model expectation. These observations constitute evidence for the 125 GeV Higgs boson decaying to a pair of tau leptons.

Research Organization:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Organization:
CMS Collaboration
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1151718
Alternate ID(s):
OSTI ID: 22565711
Report Number(s):
FERMILAB-PUB--14-082-CMS; CERN-PH-EP--2014-001; CMS-HIG--13-004; arXiv eprint number arXiv:1401.5041
Journal Information:
Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 5 Vol. 2014; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English

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Perturbed Lepton-Specific Two-Higgs-Doublet Model Facing Experimental Hints for Physics beyond the Standard Model journal February 2016
Observation of the diphoton decay of the Higgs boson and measurement of its properties journal October 2014
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New LHC benchmarks for the $$\mathcal{CP}$$ CP -conserving two-Higgs-doublet model journal October 2015
B-meson anomalies and Higgs physics in flavored $$U(1)'$$ U ( 1 ) ′ model journal April 2018
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Revealing mass-degenerate states in Higgs boson signals journal December 2019
Implications of a 125 GeV Higgs boson journal March 2015
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Observation of the diphoton decay of the Higgs boson and measurement of its properties text January 2014
The CMS trigger system text January 2017
Observation of Higgs Boson Decay to Bottom Quarks text January 2018
Measurements of Higgs-boson decays to leptons with the ATLAS detector journal January 2019
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Observation of Higgs boson decay to bottom quarks text January 2018
Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector text January 2018
Observation of Higgs boson decay to bottom quarks text January 2018
Observation of the diphoton decay of the Higgs boson and measurement of its properties text January 2014
Constraints on the spin-parity and anomalous HVV couplings of the Higgs boson in proton collisions at 7 and 8 TeV text January 2015
Limits on the Higgs boson lifetime and width from its decay to four charged leptons text January 2015
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Search for Higgs boson pair production in the bbττ final state in proton-proton collisions at √(s)=8  TeV text January 2017
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Constraining CP-violating Higgs Sectors at the LHC using gluon fusion text January 2014
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Measurement of the $\mathrm {Z}/\gamma ^{*} \rightarrow \tau \tau $ cross section in pp collisions at $\sqrt{s} = 13 \hbox { TeV}$=13TeV and validation of $\tau $ lepton analysis techniques text January 2018
Observation and measurement of Higgs boson decays to WW* with the ATLAS detector text January 2015


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