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- W2091775963 abstract "Recently the ATLAS and CMS experiments have presented data hinting at the presence of a Higgs boson at $m_hsimeq125$ GeV. The best-fit $hrightarrowgammagamma$ rate averaged over the two experiments is approximately $2.1pm0.5$ times the Standard Model prediction. We study the possibility that the excess relative to the Standard Model is due to $hrightarrow aa$ decays, where $a$ is a light pseudoscalar that decays predominantly into $gammagamma$. Although this process yields $4gamma$ final states, if the pseudoscalar has a mass of the order tens of MeV, the two photons from each $a$ decay can be so highly collimated that they may be identified as a single photon. Some fraction of the events then contribute to an effective $hrightarrowgammagamma$ signal. We study the constraints on the parameter space where the net $hrightarrowgammagamma$ rate is enhanced over the Standard Model by this mechanism and describe some simple models that give rise to the pseudoscalar-photon interaction. Further tests and prospects for searches in the near future are discussed." @default.
- W2091775963 created "2016-06-24" @default.
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- W2091775963 date "2012-06-26" @default.
- W2091775963 modified "2023-09-24" @default.
- W2091775963 title "Diphotons from tetraphotons in the decay of a 125 GeV Higgs boson at the LHC" @default.
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- W2091775963 doi "https://doi.org/10.1103/physrevd.85.115023" @default.
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