标题： 在 sqrt(s)=7 TeV 下使用 ATLAS 探测器搜索单个 b*-夸克的产生 显示英文标题

标题： Search for single b*-quark production with the ATLAS detector at sqrt(s)=7 TeV

摘要： 在sqrt(s)=7 TeV的pp碰撞中，利用ATLAS探测器在LHC上收集的4.7/fb数据，对激发态底夸克b*进行了搜索。 在研究的模型中，通过色磁相互作用产生一个单独的b*-夸克，并随后衰变为W玻色子和顶夸克。 该搜索在双轻子和轻子+喷注最终态中进行，这些最终态被结合以设定一系列b*-夸克质量下的b*-夸克耦合限制。 对于具有单位大小色磁耦合和标准模型类似电弱b*耦合的基准情况，质量小于870 GeV的b*-夸克在95%可信度水平下被排除。 显示英文摘要

摘要： The results of a search for an excited bottom-quark b* in pp collisions at sqrt(s)=7 TeV, using 4.7/fb of data collected by the ATLAS detector at the LHC are presented. In the model studied, a single b*-quark is produced through a chromomagnetic interaction and subsequently decays to a W boson and a top-quark. The search is performed in the dilepton and lepton+jets final states, which are combined to set limits on b*-quark couplings for a range of b*-quark masses. For a benchmark with unit size chromomagnetic and Standard Model-like electroweak b* couplings, b*-quarks with masses less than 870 GeV are excluded at the 95% credibility level.