论文标题
通过独家$ z $ boson decay探测$ zb \ bar {b} $异常耦合
Probing the $Zb\bar{b}$ anomalous couplings via exclusive $Z$ boson decay
论文作者
论文摘要
我们建议利用独家$ z $ -boson稀有腐烂$ z \ to到υ（ns）+γ$，以限制$ zb \ bar \ bar {b} $耦合在HL-LHC和100 TEV Proton-Proton-Proton Collider上。我们证明，所提出的过程的事件产量对$ Zb \ bar {b} $耦合的轴向矢量成分敏感，并且可以为EIC和LHC处的$ gg \ to $ gg \ gg \ gg \ gg \ gg \ gg \ gg \ gg $ gg \ to在LHC处提供互补信息。通过应用NRQCD分解形式主义，我们将$ z \ to到υ（ns）+γ$的部分衰减宽度计算为强相互作用的NLO准确性，这与从轻孔分布幅度方法中获得的相互作用一致。我们表明，HL-LHC可以打破$ zb \ bar {b} $耦合的退化，这是LEP和SLC上的精确electroweak数据所暗示的，如果信号效率可以从当前ATLAS分析中以13 tev lhc的1.7提高信号效率，并以13 tev lhc的整体流畅性为$ 36.1.11.11.11 〜bb rm fm。
We propose to utilize the exclusive $Z$-boson rare decays $Z\to Υ(ns)+γ$ to constrain the $Zb\bar{b}$ couplings at the HL-LHC and 100 TeV proton-proton collider. We demonstrate that the event yield of the proposed processes is sensitive to the axial-vector component of the $Zb\bar{b}$ coupling and can provide complementary information to the jet-charge weighted single-spin asymmetry measurement at the EIC and the $gg\to Zh$ production rate measurement at the LHC. By applying the NRQCD factorization formalism, we calculate the partial decay width of $Z\to Υ(ns)+γ$ to the NLO accuracy in strong interaction, which is found to agree with those obtained from the light-cone distribution amplitude approach. We show that the HL-LHC can break the degeneracy of the $Zb\bar{b}$ couplings, as implied by the precision electroweak data at LEP and SLC, if the signal efficiency can be improved by a factor of 1.7 from the present ATLAS analysis at the 13 TeV LHC with an integrated luminosity of $36.1~{\rm fb}^{-1}$.
