Search for Higgs Boson Pair Production in the γγ<i>b</i>(<i>b</i>)over-bar Final State Using <i>pp</i> Collision Data at √<i>s</i>=8 TeV from the ATLAS Detector
PHYSICAL REVIEW LETTERS, vol.114, no.8, 2015 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 114 Issue: 8
- Publication Date: 2015
- Doi Number: 10.1103/physrevlett.114.081802
- Journal Name: PHYSICAL REVIEW LETTERS
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Open Archive Collection: AVESIS Open Access Collection
- Ankara University Affiliated: Yes
Abstract
Searches are performed for resonant and nonresonant Higgs boson pair production in the gamma gamma b (b) over bar final state using 20 fb(-1) of proton-proton collisions at a center-of-mass energy of 8 TeV recorded with the ATLAS detector at the CERN Large Hadron Collider. A 95% confidence level upper limit on the cross section times branching ratio of nonresonant production is set at 2.2 pb, while the expected limit is 1.0 pb. The difference derives from a modest excess of events, corresponding to 2.4 standard deviations from the background-only hypothesis. The limit observed in the search for a narrow X -> hh resonance ranges between 0.7 and 3.5 pb as a function of the resonance mass.