Search for Higgs boson pair production in the bb¯bb¯ final state from pp collisions at s√=8 TeVwith the ATLAS detector

Barton, Adam and Beattie, Michael and Bouhova-Thacker, Evelina Vassileva and Dearnaley, William and Fox, Harald and Grimm, Kathryn Ann Tschann and Henderson, Robert Charles William and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin Eamonn and Love, Peter Allan and Maddocks, Harvey and Skinner, Malcolm and Smizanska, Maria and Walder, James William and Wharton, Andy (2015) Search for Higgs boson pair production in the bb¯bb¯ final state from pp collisions at s√=8 TeVwith the ATLAS detector. European Physical Journal C: Particles and Fields, 75 (9). ISSN 1434-6044

[img]
Preview
PDF (art%3A10.1140%2Fepjc%2Fs10052-015-3628-x)
art_3A10.1140_2Fepjc_2Fs10052_015_3628_x.pdf - Published Version
Available under License Creative Commons Attribution.

Download (3MB)

Abstract

A search for Higgs boson pair production pp→hh is performed with 19.5 fb−1 of proton–proton collision data at s√=8 TeV, which were recorded by the ATLAS detector at the Large Hadron Collider in 2012. The decay products of each Higgs boson are reconstructed as a high-momentum bb¯ system with either a pair of small-radius jets or a single large-radius jet, the latter exploiting jet substructure techniques and associated b-tagged track-jets. No evidence for resonant or non-resonant Higgs boson pair production is observed. The data are interpreted in the context of the Randall–Sundrum model with a warped extra dimension as well as the two-Higgs-doublet model. An upper limit on the cross-section for pp→G∗KK→hh→bb¯bb¯ of 3.2 (2.3) fb is set for a Kaluza–Klein graviton G∗KK mass of 1.0 (1.5) TeV, at the 95 % confidence level. The search for non-resonant Standard Model hh production sets an observed 95 % confidence level upper limit on the production cross-section σ(pp→hh→bb¯bb¯) of 202 fb, compared to a Standard Model prediction of σ(pp→hh→bb¯bb¯)=3.6±0.5 fb.

Item Type:
Journal Article
Journal or Publication Title:
European Physical Journal C: Particles and Fields
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2201
Subjects:
ID Code:
77878
Deposited By:
Deposited On:
21 Jan 2016 11:40
Refereed?:
Yes
Published?:
Published
Last Modified:
26 May 2020 04:33