Search for Higgs boson decays to a photon and a Z boson in pp collisions at s=7 and 8 TeV with the ATLAS detector

A search is reported for a neutral Higgs boson in the decay channel H→Zγ, Z→ℓ+ℓ− (ℓ=e,μ), using 4.5 fb−1 of pp collisions at s=7 TeV and 20.3 fb−1 of pp collisions at s=8 TeV, recorded by the ATLAS detector at the CERN Large Hadron Collider. The observed distribution of the invariant mass of the thr...

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Veröffentlicht in:	Physics letters. B 2014-05, Vol.732 (C), p.8-27
Hauptverfasser:	Abajyan, T., Addy, T.N., Alonso, A., Astalos, R., Augsten, K., Barreiro, F., Bellomo, M., Beringer, J., Blanchard, J.-B., Bloch, I., Bomben, M., Brau, B., Bugge, L., Carrillo-Montoya, G.D., Cerny, K., Chitan, A., Cole, S., Costa, G., Crosetti, G., Cuhadar Donszelmann, T., De Castro, S., Demilly, A., Derkaoui, J.E., Dube, S., Ernst, M., Fournier, D., Gavrilenko, I.L., Hawkins, A.D., Hayward, H.S., Hsu, S.-C., Huseynov, N., Iakovidis, G., Iliadis, D., Ji, W., Ju, X., Khramov, E., Kim, S.H., Kraus, J.K., Laporte, J.F., Lenz, T., Lin, S.C., Lissauer, D., Liu, J.B., Lorenzo Martinez, N., Losty, M.J., Love, P.A., Lund-Jensen, B., Malek, F., Maurer, J., Meirose, B., Nakahama, Y., Negrini, M., Nicolaidou, R., Ochoa, M.I., Ouyang, Q., Pacheco Pages, A., Pahl, C., Pantea, D., Passaggio, S., Qian, J., Quarrie, D.R., Radloff, P., Rinaldi, L., Rodrigues, L., Rousseau, D., Rybar, M., Salzburger, A., Sanchez, A., Sbarra, C., Shan, L.Y., Shao, Q.T., Simak, V., Siragusa, G., Smakhtin, V., Smirnova, L.N., Snesarev, A.A., Stahlman, J., Stanecka, E., Suzuki, Y., Tan, K.G., Thoma, S., Thompson, P.D., Tokár, S., Tsarouchas, C., Tudorache, A., Turecek, D., Turk Cakir, I., Vanadia, M., Viehhauser, G.H.A., Walkowiak, W., Watanabe, I., Wermes, N., Werner, M., Wilson, A., Wittkowski, J., Wolter, M.W., Xu, D., Yang, H., Yu, J.M., Zerwas, D.
Format:	Artikel
Sprache:	eng
Schlagworte:	PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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Zusammenfassung:	A search is reported for a neutral Higgs boson in the decay channel H→Zγ, Z→ℓ+ℓ− (ℓ=e,μ), using 4.5 fb−1 of pp collisions at s=7 TeV and 20.3 fb−1 of pp collisions at s=8 TeV, recorded by the ATLAS detector at the CERN Large Hadron Collider. The observed distribution of the invariant mass of the three final-state particles, mℓℓγ, is consistent with the Standard Model hypothesis in the investigated mass range of 120–150 GeV. For a Higgs boson with a mass of 125.5 GeV, the observed upper limit at the 95% confidence level is 11 times the Standard Model expectation. Upper limits are set on the cross section times branching ratio of a neutral Higgs boson with mass in the range 120–150 GeV between 0.13 and 0.5 pb for s=8 TeV at 95% confidence level.
ISSN:	0370-2693 1873-2445
DOI:	10.1016/j.physletb.2014.03.015