Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland.
Phys Rev Lett. 2011 Jul 15;107(3):031801. doi: 10.1103/PhysRevLett.107.031801. Epub 2011 Jul 11.
We present the results of a search for a very light CP-odd Higgs boson a(1)(0) originating from top quark decays t → H(±)b → W(±(*)) a(1)(0)b, and subsequently decaying into τ+ τ-. Using a data sample corresponding to an integrated luminosity of 2.7 fb(-1) collected by the CDF II detector in pp collisions at 1.96 TeV, we perform a search for events containing a lepton, three or more jets, and an additional isolated track with transverse momentum in the range 3 to 20 GeV/c. Observed events are consistent with background sources, and 95% C.L. limits are set on the branching ratio of t → H(±)b for various masses of H(±) and a(1)(0).
我们给出了一个源于顶夸克衰变 t→H(±)b→W(±(*))a(1)(0)b 的非常轻的 CP 奇异性 Higgs 玻色子 a(1)(0)的搜索结果，随后它衰变为 τ+τ-。利用 CDF II 探测器在 1.96 TeV 的 pp 碰撞中采集的对应于 2.7 fb(-1)积分亮度的数据样本，我们对含有一个轻子、三个或更多喷注以及另外一个横动量在 3 到 20 GeV/c 范围内的隔离轨迹的事件进行了搜索。观测到的事件与背景源一致，并对各种质量的 H(±)和 a(1)(0)的 t→H(±)b 的分支比设置了 95%置信度限制。
