Search for Higgs boson decays to a photon and a <i>Z</i> boson in <i>pp</i> collisions at √<i>s</i>=7 and 8 TeV with the ATLAS detector


Aad G., Abajyan T., Abbott B., Abdallah J., Abdel Khalek S., Abdinov O., ...More

PHYSICS LETTERS B, pp.8-27, 2014 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Publication Date: 2014
  • Doi Number: 10.1016/j.physletb.2014.03.015
  • Journal Name: PHYSICS LETTERS B
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.8-27
  • Ankara University Affiliated: Yes

Abstract

A search is reported for a neutral Higgs boson in the decay channel H -> Z gamma, Z -> l(+)l(-) (l = e, mu), using 4.5 fb(-1) of pp collisions at root s = 7 TeV and 20.3 fb(-1) of pp collisions at root s = 8 TeV, recorded by the ATLAS detector at the CERN Large Hadron Collider. The observed distribution of the invariant mass of the three final-state particles, m(ll gamma), is consistent with the Standard Model hypothesis in the investigated mass range of 120-150 GeV. For a Higgs boson with a mass of 125.5 GeV, the observed upper limit at the 95% confidence level is 11 times the Standard Model expectation. Upper limits are set on the cross section times branching ratio of a neutral Higgs boson with mass in the range 120-150 GeV between 0.13 and 0.5 pb for root s = 8 TeV at 95% confidence level. (C) 2014 The Authors. Published by Elsevier B.V.