lepton flavor universality

  • 文章类型: Journal Article
    在B±→K±μμ-和B±→K±e-衰减中测试轻子风味的普遍性,以及非共振B±→K±μμ衰减的微分和积分分支分数的测量。通过LHC的CMS实验,在2018年记录的质子-质子碰撞ats=13TeV的专用数据集使分析成为可能,使用特殊的高速率数据流,旨在收集约100亿个无偏b强子衰变。分支分数B(B±→K±μ-)与B(B±→K±e-)的比率是根据测得的这些衰变的双比率R(K)与B的相应分支分数确定的。这可以显著消除系统的不确定性。比率R(K)在1.1 A test of lepton flavor universality inB±→K±μ+μ-andB±→K±e+e-decays, as well as a measurement of differential and integrated branching fractions of a nonresonantB±→K±μ+μ-decay are presented. The analysis is made possible by a dedicated data set of proton-proton collisions ats=13TeVrecorded in 2018, by the CMS experiment at the LHC, using a special high-rate data stream designed for collecting about 10 billion unbiased b hadron decays. The ratio of the branching fractionsB(B±→K±μ+μ-)toB(B±→K±e+e-)is determined from the measured double ratioR(K)of these decays to the respective branching fractions of theB±→J/ψK±withJ/ψ→μ+μ-ande+e-decays, which allow for significant cancellation of systematic uncertainties. The ratioR(K)is measured in the range1.1
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  • 文章类型: Journal Article
    对被迷住的强子的弱衰变的全面回顾(D0/+,[公式:见文本]和[公式:见文本])基于对BESIII实验中eean灭阈值数据的分析。讨论了当前的实验挑战和在理解迷人的强子衰变方面的成功。通过测量迷住的强子的纯轻子和半轻子衰变,可以提供量子色动力学的精确校准和标准模型的测试。轻子的普遍性是在被迷住的介子到三代轻子的纯轻子衰变中进行的。阈值数据样本中的量子相关性提供了对中性D介子衰变中的强相的访问,并探测了迷住的Λc重子的衰变动力学。具有接近阈值产生的迷人粒子对的魅力物理学研究是BESIII独有的,并提供了许多重要的机遇和挑战。
    A comprehensive review of weak decays of charmed hadrons (D 0/ +, [Formula: see text] and [Formula: see text]) based on analyses of the threshold data from e + e - annihilation in the BESIII experiment is presented. Current experimental challenges and successes in understanding decays of the charmed hadrons are discussed. Precise calibrations of quantum chromodynamics and tests of the standard model are provided by measurements of purely leptonic and semi-leptonic decays of charmed hadrons, and lepton universality is probed in purely leptonic decays of charmed mesons to three generations of leptons. Quantum correlations in threshold data samples provide access to strong phases in the neutral D meson decays and probe the decay dynamics of the charmed Λ c baryon. Charm physics studies with near-threshold production of charmed particle pairs are unique to BESIII, and provide many important opportunities and challenges.
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