Allbrooke, B M M, Asquith, L, Cerri, A, Chavez Barajas, C A, De Santo, A, Salvatore, F, Santoyo Castillo, I, Suruliz, K, Sutton, M R, Vivarelli, I and The ATLAS Collaboration, et al. (2015) Search for Higgs boson pair production in the bb¯bb¯ final state from pp collisions at √s=8 TeV with the ATLAS detector. European Physical Journal C, 75 (412). ISSN 1434-6044

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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→GKK∗→hh→bb¯bb¯ of 3.2 (2.3) fb is set for a Kaluza–Klein graviton GKK∗ 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:	Article
Schools and Departments:	School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups:	Experimental Particle Physics Research Group
Subjects:	Q Science > QC Physics
Depositing User:	Billy Wichaidit
Date Deposited:	28 Apr 2017 10:05
Last Modified:	28 Apr 2017 10:13
URI:	http://sro.sussex.ac.uk/id/eprint/67565

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