Jul 4 – 11, 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

Search for light Higgs bosons in radiative Upsilon(1S) decays at BABAR

Jul 6, 2012, 5:00 PM
Plenary 3 (Melbourne Convention and Exhibition Centre)

Plenary 3

Melbourne Convention and Exhibition Centre

Melbourne Australia
Parallel Sessions Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches Plenary3 - The Standard Model -TR1


Prof. Yury Kolomensky (UC Berkeley & LBNL (US))


We search for a light CP-odd Higgs boson (A0) that arises in non-minimal supersymmetric extensions of the Standard Model and naturally couples strongly to bottom quarks. The search is conducted using radiative di-muon and di-tau decays of the Upsilon(1S) meson. We use BABAR’s large data sets of (92.8 +- 0.8) million Upsilon(2S) and (116.8 +- 1.0) million Upsilon(3S) decays to identify Upsilon(1S) production via the decay Upsilon(2S,3S) --> pi+pi- Upsilon(1S). This yields a high-purity sample with a Higgs-search sensitivity similar to that of radiative Upsilon(2S) and Upsilon(3S) decays. We set stringent limits on the product of branching ratios Br(Upsilon(1S) --> gamma A0) x B(A0 --> l+l-) where l = mu or tau, as well as on the effective coupling of the b-quark to the A0. Depending on the parameters of the model, the Higgs may decay predominantly into hadrons. We also present results of a search for a CP-odd Higgs boson produced in radiative Upsilon(2S) or Upsilon(3S) decays and decaying into hadrons. Our results severely restrict the available parameter space for models predicting light Higgs states.

Primary authors

(A. Soffer) BABAR Collaboration (SLAC) Prof. Yury Kolomensky (UC Berkeley & LBNL (US))

Presentation materials