Abstract
A study is presented of the mass and spin-parity of the new boson recently observed at the LHC at a mass near 125 GeV. An integrated luminosity of 17.3 fb(-1), collected by the CMS experiment in proton-proton collisions at center-of-mass energies of 7 and 8 TeV, is used. The measured mass in the ZZ channel, where both Z bosons decay to e or μ pairs, is 126.2 ± 0.6(stat) ± 0.2(syst) GeV. The angular distributions of the lepton pairs in this channel are sensitive to the spin-parity of the boson. Under the assumption of spin 0, the present data are consistent with the pure scalar hypothesis, while disfavoring the pure pseudoscalar hypothesis.
Highlights
A study is presented of the mass and spin-parity of the new boson recently observed at the LHC at a mass near 125 GeV
Under the assumption of spin 0, the present data are consistent with the pure scalar hypothesis, while disfavoring the pure pseudoscalar hypothesis
The ATLAS and compact muon solenoid (CMS) Collaborations announced the observation of a narrow resonance with mass near 125 GeV [1,2] and properties consistent with those of the Higgs boson predicted in the standard model (SM) [3,4,5] of particle physics
Summary
A study is presented of the mass and spin-parity of the new boson recently observed at the LHC at a mass near 125 GeV. The measured mass in the ZZ channel, where both Z bosons decay to e or pairs, is 126:2 Æ 0:6ðstatÞ Æ 0:2ðsystÞ GeV.
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