科研之友
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摘要
Recently, the LHC collaborations, ATLAS and CMS, have announced an excess in the diphoton channel with local significance of about 3 sigma around an invariant mass distribution of similar to 750 GeV, after analyzing new data collected at center-of-mass energies of root s = 13 TeV. We present a possible physical interpretation of such a signature, within the framework of a minimal UV-complete model with a massive singlet pseudoscalar state a that couples to a new TeV-scale colored vectorlike fermion F, whose hypercharge quantum number is a non-zero integer. The pseudo-scalar state a might be a heavy pseudo-Goldstone boson, such as a heavy axion, which decays into two photons and whose mass lies around the excess region. The mass of the CP-odd state a and its coupling to F may be due to nonperturbative effects, which can break the original Goldstone shift symmetry dynamically. The possible role that the heavy axion a can play in the radiative generation of a seesaw Majorana scale and in the solution to the so-called strong CP problem is briefly discussed.
- 出版日期2016-1-27
