Search for very light CP-odd Higgs Boson in radiative decays of Upsilon(1S).

Love W, Savinov V, Mendez H,Ge J Y,Miller D H,Shipsey I P J,Xin B,Adams G S,Anderson M, Cummings J P,Danko I,Hu D,Moziak B,Napolitano J,He Q,Insler J,Muramatsu H,Park C S,Thorndike E H,Yang F, Artuso M, Blusk S, Khalil S,Li J,Mountain R, Nisar S, Randrianarivony K, Sultana N,Skwarnicki T, Stone S,Wang J C,Zhang L M, Bonvicini G,Cinabro D, Dubrovin M, Lincoln A,Naik P, Rademacker J, Asner D M, Edwards K W, Reed J, Briere R A,Ferguson T, Tatishvili G,Vogel H,Watkins M E, Rosner J L,Alexander J P, Cassel D G, Duboscq J E, Ehrlich R, Fields L, Galik R S, Gibbons L, Gray R,Gray S W, Hartill D L, Heltsley B K, Hertz D, Hunt J M, Kandaswamy J, Kreinick D L, Kuznetsov V E, Ledoux J, Mahlke-Krüger H, Mohapatra D, Onyisi P U E, Patterson J R, Peterson D, Riley D, Ryd A, Sadoff A J,Shi X, Stroiney S, Sun W M, Wilksen T, Athar S B, Patel R, Yelton J, Rubin P, Eisenstein B I, Karliner I, Mehrabyan S, Lowrey N, Selen M, White E J,Wiss J, Mitchell R E, Shepherd M R, Besson D, Pedlar T K, Cronin-Hennessy D, Gao K Y, Hietala J,Kubota Y, Klein T, Lang B W,Poling R,Scott A W, Zweber P, Dobbs S, Metreveli Z, Seth K K, Tomaradze A, Libby J, Martin L, Powell A, Wilkinson G, Ecklund K M, Null Null

Physical review letters（2008）

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摘要

We search for a non-SM-like CP-odd Higgs boson (a(1)(0)) decaying to tau(+)tau(-) or mu(+)mu(-) in radiative decays of the Upsilon(1S). No significant signal is found, and upper limits on the product branching ratios are set. Our tau(+)tau(-) results are almost 2 orders of magnitude more stringent than previous upper limits. Our data provide no evidence for a Higgs state with a mass of 214 MeV decaying to mu(+)mu(-), previously proposed as an explanation for 3 Sigma(+)-->pmu(+)mu(-) events observed by the HyperCP experiment. Our results constrain NMSSM models.

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关键词

pair production,branching ratio,elementary particles,higgs boson,standard model,protons,mass

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