Title

Search for light Higgs in radiative decays of Upsilon(1 S)

Date of Award

2008

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Physics

Keywords

Higgs boson, NMSSM, Upsilon, Energy

Subject Categories

Physical Sciences and Mathematics | Physics

Abstract

We have searched for non-SM-like CP-odd Higgs-boson ([Special characters omitted.] ) with [Special characters omitted.] < 2 m b in radiative decays of the Υ(1 S ), using 21.5M Υ(1 S ) mesons directly produced in e + e - annihilation. We investigate [Special characters omitted.] [arrow right] τ + τ - and [Special characters omitted.] [arrow right] μ + μ - decay channels. No significant signal is found. We obtain upper limits on the product of [Special characters omitted.] (Υ(1 S ) [arrow right] γ[Special characters omitted.] ) and [Special characters omitted.] ([Special characters omitted.] [arrow right] τ + τ - ) or [Special characters omitted.] ([Special characters omitted.] [arrow right] μ + μ - ). Our τ + τ - results are almost two orders of magnitude more stringent than previous upper limits. Our data provides no evidence for a Higgs state decaying to μ + μ - , with a mass of 214 MeV. Existence of such state was previously proposed as an explanation for 3 Σ + [arrow right] p μ + μ - events, with μ + μ - mass just above the kinematic threshold, claimed by the HyperCP experiment. Our results constrain NMSSM mode.

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