Search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV in the diphoton final state in proton-proton collisions at √s=13 TeV

PRASANT KUMAR ROUT^1*

¹Department of Physics, and Center for High Energy and High Field physics, National Central University, Taoyuan, Taiwan

* Presenter:PRASANT KUMAR ROUT, email:prasant.kumar.rout@cern.ch

The results of a search for a standard model-like Higgs boson decaying into two photons in the mass range between 70 and 110 GeV are presented. The analysis uses the data set collected with the CMS experiment in proton-proton collisions corresponding to, respectively, 36.3 fb−1, 41.5 fb−1and 54.4 fb−1, during the 2016, 2017 and 2018 LHC running periods, at √s=13 TeV. The expected and observed 95% confidence level upper limits on the product of the cross section and branching fraction for decays of an additional Higgs boson into two photons are presented. The observed upper limit for the combined data set ranges from 73 fb to 15 fb. A modest excess was observed for the existence of an additional standard model-like Higgs boson at 2.9 standard deviation local and 1.3 standard deviation global significance at a mass hypothesis of 95.4 GeV under the background only hypothesis.

Keywords: standard model, Higgs boson, electroweak interaction, quantum field theory, Large Hadron Collider