We search for di-muon decays of a low-mass Higgs boson (A0) produced in radiative Υ(1S) decays. The Υ(1S) sample is selected by tagging the pion pair in the Υ(2S,3S)→π+π−Υ(1S) transitions, using a data sample of 92.8×106 Υ(2S) and 116.8×106 Υ(3S) events collected by the BABAR detector. We find no evidence for A0 production and set 90% confidence level upper limits on the product branching fraction ℬ(Υ(1S)→γA0)×ℬ(A0→μ+μ−) in the range of (0.28−9.7)×10−6 for 0.212≤mA0≤9.20 GeV/c2. The results are combined with our previous measurements of Υ(2S,3S)→γA0, A0→μ+μ− to set limits on the effective coupling of the b quark to the A0.
Titolo: | Search for di-muon decays of a low-mass Higgs boson in radiative decays of the Υ(1S) | |
Autori: | ||
Data di pubblicazione: | 2013 | |
Rivista: | ||
Abstract: | We search for di-muon decays of a low-mass Higgs boson (A0) produced in radiative Υ(1S) decays. The Υ(1S) sample is selected by tagging the pion pair in the Υ(2S,3S)→π+π−Υ(1S) transitions, using a data sample of 92.8×106 Υ(2S) and 116.8×106 Υ(3S) events collected by the BABAR detector. We find no evidence for A0 production and set 90% confidence level upper limits on the product branching fraction ℬ(Υ(1S)→γA0)×ℬ(A0→μ+μ−) in the range of (0.28−9.7)×10−6 for 0.212≤mA0≤9.20 GeV/c2. The results are combined with our previous measurements of Υ(2S,3S)→γA0, A0→μ+μ− to set limits on the effective coupling of the b quark to the A0. | |
Handle: | http://hdl.handle.net/11368/2768386 | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1103/PhysRevD.87.031102 | |
Appare nelle tipologie: | 1.1 Articolo in Rivista |