科研之友
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摘要
Recently the ATLAS and CMS experiments have presented data hinting at the presence of a Higgs boson at m(h) similar or equal to 125 GeV. The best-fit h -%26gt; gamma gamma rate averaged over the two experiments is approximately 2.1 +/- 0.5 times the standard model prediction. We study the possibility that the excess relative to the standard model is due to h -%26gt; a decays, where a is a light pseudoscalar that decays predominantly into gamma gamma. Although this process yields 4 gamma 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 h -%26gt; gamma gamma signal. We study the constraints on the parameter space where the net h -%26gt; gamma gamma 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.
- 出版日期2012-6-26
