Observation and measurement of Higgs boson decays to WWwith the ATLAS detector

ATLAS Collaboration, T. Iizawa

    Research output: Contribution to journalArticle

    73 Citations (Scopus)

    Abstract

    We report the observation of Higgs boson decays to WWbased 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-1from √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.

    Original languageEnglish
    Article number012006
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume92
    Issue number1
    DOIs
    Publication statusPublished - 2015 Jul 16

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    Higgs bosons
    fusion
    detectors
    decay
    standard deviation
    bosons
    cross sections
    luminosity
    collisions

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

    Cite this

    Observation and measurement of Higgs boson decays to WWwith the ATLAS detector. / ATLAS Collaboration; Iizawa, T.

    In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 92, No. 1, 012006, 16.07.2015.

    Research output: Contribution to journalArticle

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    abstract = "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-1from √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.",
    author = "{ATLAS Collaboration} and G. Aad and B. Abbott and J. Abdallah and {Abdel Khalek}, S. and O. Abdinov and R. Aben and B. Abi and M. Abolins and {Abou Zeid}, {O. S.} and H. Abramowicz and H. Abreu and R. Abreu and Y. Abulaiti and Acharya, {B. S.} and L. Adamczyk and Adams, {D. L.} and J. Adelman and S. Adomeit and T. Adye and T. Agatonovic-Jovin and Aguilar-Saavedra, {J. A.} and M. Agustoni and Ahlen, {S. P.} and F. Ahmadov and G. Aielli and H. Akerstedt and {\AA}kesson, {T. P A} and G. Akimoto and Akimov, {A. V.} and Alberghi, {G. L.} and J. Albert and S. Albrand and {Alconada Verzini}, {M. J.} and M. Aleksa and Aleksandrov, {I. N.} and C. Alexa and G. Alexander and G. Alexandre and T. Alexopoulos and M. Alhroob and G. Alimonti and L. Alio and J. Alison and Allbrooke, {B. M M} and Allison, {L. J.} and Allport, {P. P.} and A. Aloisio and T. Iizawa and Takashi Mitani and Kohei Yorita",
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    T1 - Observation and measurement of Higgs boson decays to WW∗with the ATLAS detector

    AU - ATLAS Collaboration

    AU - Aad, G.

    AU - Abbott, B.

    AU - Abdallah, J.

    AU - Abdel Khalek, S.

    AU - Abdinov, O.

    AU - Aben, R.

    AU - Abi, B.

    AU - Abolins, M.

    AU - Abou Zeid, O. S.

    AU - Abramowicz, H.

    AU - Abreu, H.

    AU - Abreu, R.

    AU - Abulaiti, Y.

    AU - Acharya, B. S.

    AU - Adamczyk, L.

    AU - Adams, D. L.

    AU - Adelman, J.

    AU - Adomeit, S.

    AU - Adye, T.

    AU - Agatonovic-Jovin, T.

    AU - Aguilar-Saavedra, J. A.

    AU - Agustoni, M.

    AU - Ahlen, S. P.

    AU - Ahmadov, F.

    AU - Aielli, G.

    AU - Akerstedt, H.

    AU - Åkesson, T. P A

    AU - Akimoto, G.

    AU - Akimov, A. V.

    AU - Alberghi, G. L.

    AU - Albert, J.

    AU - Albrand, S.

    AU - Alconada Verzini, M. J.

    AU - Aleksa, M.

    AU - Aleksandrov, I. N.

    AU - Alexa, C.

    AU - Alexander, G.

    AU - Alexandre, G.

    AU - Alexopoulos, T.

    AU - Alhroob, M.

    AU - Alimonti, G.

    AU - Alio, L.

    AU - Alison, J.

    AU - Allbrooke, B. M M

    AU - Allison, L. J.

    AU - Allport, P. P.

    AU - Aloisio, A.

    AU - Iizawa, T.

    AU - Mitani, Takashi

    AU - Yorita, Kohei

    PY - 2015/7/16

    Y1 - 2015/7/16

    N2 - 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-1from √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.

    AB - 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-1from √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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