A search for Higgs boson pair production pp→hh is performed with 19.5 fb−1 of proton--proton collision data at sqrt(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 SM prediction of σ(pp→hh→bb¯bb¯)=3.6±0.5 fb.

Search for Higgs boson pair production in the bb¯ final state from pp collisions at sqrt(s) = 8 TeV with the ATLAS detector

GORINI, Edoardo;PRIMAVERA, Margherita;SPAGNOLO, Stefania Antonia;VENTURA, Andrea
2015-01-01

Abstract

A search for Higgs boson pair production pp→hh is performed with 19.5 fb−1 of proton--proton collision data at sqrt(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 SM prediction of σ(pp→hh→bb¯bb¯)=3.6±0.5 fb.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11587/393045
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