arXiv subjects

The BABAR collaboration

Publications and source records attributed to The BABAR collaboration.

2 recordsLinked to original sources

arXiv2013

Search for di-muon decays of a low-mass Higgs boson in radiative decays of the Υ(1S)

We search for di-muon decays of a low-mass Higgs boson (A^0) produced in radiative Υ(1S) decays. The Υ(1S) sample is selected by tagging the pion pair in the Υ(2S, 3S) \to π^+ π^- Υ(1S) transitions, using a data sample of 92.8 \times 10^6 Υ(2S) and 116.8 \times 10^6 Υ(3S) events collected by the \babar\ detector. We find no evidence for A^0 production and set 90% confidence level upper limits on the product branching fraction \mathcal{B} (Υ(1S) \to γA^0) \times \mathcal{B} (A^0 \to \mumu) in the range of (0.28 - 9.7) \times 10^{-6} for 0.212 \le m_{A^0} \le 9.20 GeV/c^2. The results are combined with our previous measurements of Υ(2S,3S) \to γA^0, A^0 \to \mumu to set limits on the effective coupling of the \b-quark to the A^0.

hep-ex↗

arXiv2007

Branching fraction and charge asymmetry measurements in B to J/psi pi pi decays

We study the decays B0 to J/psi pi+pi- and B+ to J/psi pi+pi0, including intermediate resonances, using a sample of 382 million BBbar pairs recorded by the BaBar detector at the PEP-II e+e- B factory. We measure the branching fractions B(B0 ->J/psi rho0) = (2.7 +/- 0.3 +/- 0.17) x 10-5 and B(B+ ->J/psi rho+) = (5.0 +/- 0.7 +/-0.31) x 10-5. We also set the following upper limits at the 90% confidence level: B(B0 -> J/psi pi+ π- non-resonant) < 1.2 x 10-5, B(B0 -> J/psi f_2(1270)) < 4.6 x 10-6, and B(B+ -> J/psi pi+ pi0 non-resonant) < 4.4 x 10-6. We measure the charge asymmetry in charged B decays to J/psi rho to be -0.11 +/- 0.12 +/- 0.08.

hep-ex↗