Year-end Sale % OFF 
Abstract
The Higgs boson is an elementary particle predicted for why some fundamental particles have mass around 50 years ago to exist by the standard model of particle physics. In 2012 summer, a Higgs-like boson was discovered around 125 GeV [CMS collaboration, Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC, Phys. Lett. B 716 (2012) 30–61]; its properties are still being studied to confirm whether it is the standard model Higgs boson or not. The production mechanism of H→Zγ and H→γγ are the same. If the new boson which was found around 125 GeV is not the standard model Higgs boson, the channel of H→Zγ will be sensitive to new physics. CMS already looked into H→Zγ in di-electron and di-muon final state. A Higgs boson in the H→γ⁎γ final-state, with the γ⁎ internal conversion into a muon pair, also known as Dalitz decays, at the LHC in the 120 to 150 GeV mass range is described. The search of H→Zγ and H→γ⁎γ (the Dalitz decay) will be discussed.
Highlights
Within the SM, the partial width for the H → Zγ decay channel is rather small
Signal modeling is from simulated events obtained from the next-to-leading order (NLO) matrix-element generator POWHEG interfaced with PYTHIA
The description of the Higgs boson signal used in the search is obtained from simulated events produced at leading-order using the Madgraph matrix-element generator interfaced with PYTHIA 6.4
Summary
Within the SM, the partial width for the H → Zγ decay channel is rather small. A measurement of H → Zγ provides important information on the underlying dynamics of the Higgs sector just as for the H → γγ decay channel. The sensitivity of the search is enhanced by 20 to 40% by dividing the selected events into mutually exclusive classes according to the expected mass resolution and the signal-to-background ratio, and combining the results from each class as Table 1. The background model is obtained by fitting the observed distribution of threebody invariant mass (mllγ) with 4th order polynomial for both leptons and photon are in the barrel and with 5th order polynomial for at least one lepton and photon are in the endcap as shown, 3 and 4. Signal modeling is from simulated events obtained from the next-to-leading order (NLO) matrix-element generator POWHEG interfaced with PYTHIA. The description of the Higgs boson signal used in the search is obtained from simulated events produced at leading-order using the Madgraph matrix-element generator interfaced with PYTHIA 6.4.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
