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2014

Evidence for the direct decay of the 125 GeV Higgs boson to fermions

CMS Collaboration

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The discovery of a new boson with a mass of approximately 125 GeV in 2012 at the LHC has heralded a new era in understanding the nature of electroweak symmetry breaking and possibly completing the standard model of particle physics.

Since the first observation in decays to gamma gamma, WW, and ZZ boson pairs, an extensive set of measurements of the mass and couplings to W and Z bosons, as well as multiple tests of the spin-parity quantum numbers, have revealed that the properties of the new boson are consistent with those of the long-sought agent responsible for electroweak symmetry breaking.
An important open question is whether the new particle also couples to fermions, and in particular to down-type fermions, since the current measurements mainly constrain the couplings to the up-type top quark.
Determination of the couplings to down-type fermions requires direct measurement of the corresponding Higgs boson decays, as recently reported by the CMS experiment in the study of Higgs decays to bottom quarks and tau leptons.

Evidence for the direct decay of the 125 GeV Higgs boson to fermions · Around

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Similar

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Then

CMS Collaboration, “Observation of a new boson with mass near 125 GeV in pp collisions at s \sqrt{s} = 7 and 8 TeV”, JHEP
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