We search for evidence of a light scalar boson in the radiative decays of the Υ(2S) and Υ(3S) resonances: Υ(2S,3S)→γA0, A0→μ+μ-. Such a particle appears in extensions of the standard model, where a light CP-odd Higgs boson naturally couples strongly to b quarks. We find no evidence for such processes in the mass range 0.212≤mA0≤9.3GeV in the samples of 99×106 Υ(2S) and 122×106 Υ(3S) decays collected by the BABAR detector at the SLAC PEP-II B factory and set stringent upper limits on the effective coupling of the b quark to the A0. We also limit the dimuon branching fraction of the ηb meson: B(ηb→μ+μ-) <0.9% at 90% confidence level.

Aubert, B., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., Prudent, X., et al. (2009). Search for dimuon decays of a light scalar boson in radiative transitions Υ→γA0. PHYSICAL REVIEW LETTERS, 103(8) [10.1103/PhysRevLett.103.081803].

Search for dimuon decays of a light scalar boson in radiative transitions Υ→γA0

CARPINELLI, Massimo;
2009

Abstract

We search for evidence of a light scalar boson in the radiative decays of the Υ(2S) and Υ(3S) resonances: Υ(2S,3S)→γA0, A0→μ+μ-. Such a particle appears in extensions of the standard model, where a light CP-odd Higgs boson naturally couples strongly to b quarks. We find no evidence for such processes in the mass range 0.212≤mA0≤9.3GeV in the samples of 99×106 Υ(2S) and 122×106 Υ(3S) decays collected by the BABAR detector at the SLAC PEP-II B factory and set stringent upper limits on the effective coupling of the b quark to the A0. We also limit the dimuon branching fraction of the ηb meson: B(ηb→μ+μ-) <0.9% at 90% confidence level.
Articolo in rivista - Articolo scientifico
Scientifica
BABAR detector
English
B. Aubert et al. (BABAR Collaboration)
Aubert, B., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., Prudent, X., et al. (2009). Search for dimuon decays of a light scalar boson in radiative transitions Υ→γA0. PHYSICAL REVIEW LETTERS, 103(8) [10.1103/PhysRevLett.103.081803].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/389466
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