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

CollaborationWith : Ancu, Lucian Stefan / Barone, Gaetano / Bell, William / Benhar Noccioli, Eleonora / Bilbao De Mendizabal, Javier / Clark, Allan Geoffrey / Delitzsch, Chris Malena / Della Volpe, Domenico / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Golling, Tobias / Gonzalez Sevilla, Sergio / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / La Rosa, Alessandro / Mermod, Philippe / Miucci, Antonio / Muenstermann, Daniel / Paolozzi, Lorenzo / Picazio, Attilio / Ristic, Branislav / Tykhonov, Andrii / Vallecorsa, Sofia / Wu, Xin
Published in The European Physical Journal. C, Particles and Fields. 2015, vol. 75, no. 9, 412
Collection Open Access - SCOAP3
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.
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ATLAS COLLABORATION. Search for Higgs boson pair production in the bb¯bb¯ final state from pp collisions at √s = 8 TeVwith the ATLAS detector. In: European physical journal. C, Particles and fields, 2015, vol. 75, n° 9, p. 412. doi: 10.1140/epjc/s10052-015-3628-x https://archive-ouverte.unige.ch/unige:75562

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Deposited on : 2015-10-01

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