Electroweak vacuum stability and diphoton excess at 750 GeV

  • Recently, both ATLAS and CMS collaborations at the CERN Large Hadron Collider (LHC) announced their observations of an excess of diphoton events around the invariant mass of 750 GeV with a local significance of 3.6σ and 2.6σ, respectively. In this paper, we interpret the diphoton excess as the on-shell production of a real singlet scalar in the pp→S→γγ channel. To accommodate the observed production rate, we further introduce a vector-like fermion F, which carries both color and electric charges. The viable regions of model parameters are explored for this simple extension of the Standard Model (SM). Moreover, we revisit the problem of electroweak vacuum stability in the same scenario, and find that the requirement for the electroweak vacuum stability up to high energy scales imposes serious constraints on the Yukawa coupling of the vector-like fermion and the quartic couplings of the SM Higgs boson and the new singlet scalar. Consequently, a successful explanation for the diphoton excess and the absolute stability of electroweak vacuum cannot be achieved simultaneously in this economical setup.
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Jue Zhang and Shun Zhou. Electroweak vacuum stability and diphoton excess at 750 GeV[J]. Chinese Physics C, 2016, 40(8): 081001. doi: 10.1088/1674-1137/40/8/081001
Jue Zhang and Shun Zhou. Electroweak vacuum stability and diphoton excess at 750 GeV[J]. Chinese Physics C, 2016, 40(8): 081001.  doi: 10.1088/1674-1137/40/8/081001 shu
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Received: 2016-02-24
Revised: 2016-04-17
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    Supported by Innovation Program of the Institute of High Energy Physics (Y4515570U1), National Youth Thousand Talents Program, and CAS Center for Excellence in Particle Physics (CCEPP)

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Electroweak vacuum stability and diphoton excess at 750 GeV

    Corresponding author: Jue Zhang,
    Corresponding author: Shun Zhou,
  • 1.  Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 2. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 3. Center for High Energy Physics, Peking University, Beijing 100871, China
Fund Project:  Supported by Innovation Program of the Institute of High Energy Physics (Y4515570U1), National Youth Thousand Talents Program, and CAS Center for Excellence in Particle Physics (CCEPP)

Abstract: Recently, both ATLAS and CMS collaborations at the CERN Large Hadron Collider (LHC) announced their observations of an excess of diphoton events around the invariant mass of 750 GeV with a local significance of 3.6σ and 2.6σ, respectively. In this paper, we interpret the diphoton excess as the on-shell production of a real singlet scalar in the pp→S→γγ channel. To accommodate the observed production rate, we further introduce a vector-like fermion F, which carries both color and electric charges. The viable regions of model parameters are explored for this simple extension of the Standard Model (SM). Moreover, we revisit the problem of electroweak vacuum stability in the same scenario, and find that the requirement for the electroweak vacuum stability up to high energy scales imposes serious constraints on the Yukawa coupling of the vector-like fermion and the quartic couplings of the SM Higgs boson and the new singlet scalar. Consequently, a successful explanation for the diphoton excess and the absolute stability of electroweak vacuum cannot be achieved simultaneously in this economical setup.

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