Publications by Babak Abi

Observation and measurement of Higgs boson decays to WW∗ with the ATLAS detector

Physical Review D American Physical Society (2015)

G Aad, B Abbott, J Abdallah, S Abdel Khalek, O Abdinov, R Aben, B Abi, M Abolins, OS Abouzeid, H Abramowicz, H Abreu, R Abreu, Y Abulaiti, BS Acharya, L Adamczyk, DL Adams, T Adye, T Agatonovic-Jovin, JA Aguilar-Saavedra, M Agustoni, SP Ahlen, H Akerstedt, TPA Åkesson, H Ji, J Jia

We report the observation of Higgs boson decays to WW ∗ based on an excess over background of 6.1 standard deviations in the dilepton final state, where the Standard Model expectation is 5.8 standard deviations. Evidence for the vector-boson fusion (VBF) production process is obtained with a significance of 3.2 standard deviations. The results are obtained from a data sample corresponding to an integrated luminosity of 25 fb -1 from √s = 7 and 8 TeV pp collisions recorded by the ATLAS detector at the LHC. For a Higgs boson mass of 125.36 GeV, the ratio of the measured value to the expected value of the total production cross section times branching fraction is 1.09 +0.16 -0.15 (stat) +0.17 -0.14 (syst). The corresponding ratios for the gluon fusion and vector-boson fusion production mechanisms are 1.02 ± 0.19(stat) +0.22 -0.18 (syst) and 1.27 +0.44 -0.40 (stat) +0.30 -0.21 (syst), respectively. At √s = 8 TeV, the total production cross sections are measured to be σ(gg→H→WW ∗ )=4.6±0.9(stat) +0.8 -0.7 (syst) pb and σ(VBF H → WW ∗ )=0.51 +0.17 -0.15 (stat) +0.13 -0.08 (syst)pb. The fiducial cross section is determined for the gluon-fusion process in exclusive final states with zero or one associated jet.

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