论文标题
通过HIGGS独家衰减探测$Hγγ$
Probing the $Hγγ$ coupling via Higgs exclusive decay into quarkonia plus a photon at the HL-LHC
论文作者
论文摘要
众所周知，$ h \toγγ$的精确度量可以产生两个变性的参数空间，$hγγ$异常耦合。我们建议利用独家的希格斯稀有衰减$ h \toυ（ns）+γ$，以折断上述堕落性，并进一步限制$Hγγ$异常耦合在HL-LHC处。我们证明，由于直接的直接干扰$ h \ \ h到键的参数空间，从$ h \toγγ$测量中可以显着提高$ h \toυ（ns）+γ$的分支比率，这是由于SM的直接产生$υ（NS）$之间的破坏性干扰。通过应用NRQCD分解形式主义，我们以$α_s$的NLO精度计算了$ h \ to到达（NS）+γ$的部分衰减宽度。我们表明，与ATLAS初步模拟相比，如果我们可以进一步高度抑制背景并提高信号效率，则希望在HL-LHC处打破这种退化的参数空间。
It is well know that the precise measurement of $H\toγγ$ can generate two degenerate parameter spaces of $Hγγ$ anomalous coupling. We propose to utilize the exclusive Higgs rare decays $H\toΥ(ns)+γ$ to break above mentioned degeneracy and further to constrain the $Hγγ$ anomalous coupling at the HL-LHC. We demonstrate that the branching ratios of $H\toΥ(ns)+γ$ can be significantly enhanced in the non-SM-like parameter space from $H\toγγ$ measurement, due to the destructive interference between the direct and indirect production of $Υ(ns)$ in the SM. By applying the NRQCD factorization formalism, we calculate the partial decay widths of $H\toΥ(ns)+γ$ at the NLO accuracy of $α_s$. We show that it is hopeful to break such degenerate parameter space at the HL-LHC if we can further highly suppress the background and enhance the signal efficiency compared to the ATLAS preliminary simulation.
