Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France.
Phys Rev Lett. 2009 Oct 30;103(18):181801. doi: 10.1103/PhysRevLett.103.181801.
We search for a light Higgs boson A0 in the radiative decay Upsilon(3S)-->gammaA(0), A(0)-->tau+tau-, tau+-->e+nu(e)nu(tau), or tau+-->mu+nu(mu)nu(tau). The data sample contains 122x10(6) Upsilon(3S) events recorded with the BABAR detector. We find no evidence for a narrow structure in the studied tau+tau- invariant mass region of 4.03<m(tau+tau-)<10.10 GeV/c2. We exclude at the 90% confidence level (C.L.) a low-mass Higgs boson decaying to tau+tau- with a product branching fraction B(Upsilon(3S)-->gammaA(0))xB(A(0)-->tau+tau-)>(1.5-16)x10(-5) across the m(tau+tau-) range. We also set a 90% C.L. upper limit on the tau+tau- decay of the eta(b) at B(eta(b)-->tau+tau-)<8%.
我们在 Υ(3S)→γA(0),A(0)→τ+τ-,τ+→e+ν(e)ν(τ)或 τ+→μ+ν(μ)ν(τ)的辐射衰变中寻找轻希格斯玻色子 A0。该数据样本包含 122×10(6)个 Υ(3S)事件,由 BABAR 探测器记录。我们没有在研究的 τ+τ-不变质量区域 4.03<m(τ+τ-)<10.10 GeV/c2 中发现窄结构的证据。我们在 90%置信水平(CL)下排除了低质量希格斯玻色子衰变为 τ+τ-的情况,其产物分支比 B(Υ(3S)→γA(0))xB(A(0)→τ+τ-)>(1.5-16)×10(-5),跨越 m(τ+τ-)范围。我们还设定了 η(b)→τ+τ-的 90%CL 上限为 B(η(b)→τ+τ-)<8%。