We study the implications of a possible unstable particle with mass M-X < TeV for the Higgs stability, naturalness and inflation. We pay particular attention to the case M-X approximate to 750 GeV, suggested by recent results of ATLAS and CMS on diphoton final states, and work within the minimal model: we add to the Standard Model field content a pseudoscalar and a vector-like fermion carrying both color and electric charge. This can stabilize the electroweak vacuum without invoking new physics at very high energies, which would give an unnaturally large contribution to the Higgs mass. We also show that inflation can be obtained via a UV modification of General Relativity. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.
Salvio, A., Mazumdar, A. (2016). Higgs stability and the 750 GeV diphoton excess. MODERN PHYSICS LETTERS B, 755, 469-474 [10.1016/j.physletb.2016.02.057].
Higgs stability and the 750 GeV diphoton excess
Salvio A.;
2016-01-01
Abstract
We study the implications of a possible unstable particle with mass M-X < TeV for the Higgs stability, naturalness and inflation. We pay particular attention to the case M-X approximate to 750 GeV, suggested by recent results of ATLAS and CMS on diphoton final states, and work within the minimal model: we add to the Standard Model field content a pseudoscalar and a vector-like fermion carrying both color and electric charge. This can stabilize the electroweak vacuum without invoking new physics at very high energies, which would give an unnaturally large contribution to the Higgs mass. We also show that inflation can be obtained via a UV modification of General Relativity. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
