Search for Higgs boson pair production in the bbbb final state from pp collisions at √s = 8 TeV with the ATLAS detector

Aad, G. and Abbott, B. and Abdallah, J. and Abdinov, O. and Aben, R. and Krasznahorkay, Attila and Nagai, Yoshikazu and Pásztor, Gabriella and Tóth, József (2015) Search for Higgs boson pair production in the bbbb final state from pp collisions at √s = 8 TeV with the ATLAS detector. EUROPEAN PHYSICAL JOURNAL C, 75 (9). 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 b¯b 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 → b¯bb¯b 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 → b¯bb¯b) of 202 fb, compared to a Standard Model prediction of σ(pp → hh → b¯bb¯b) = 3.6 ± 0.5 fb.

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