论文标题
$ higgs \ to b \ bar {b}，c \ bar {c}，gg $测量
The $Higgs\to b\bar{b}, c\bar{c}, gg$ measurement at CEPC
论文作者
论文摘要
准确测量希格斯玻色子的性能是圆形电子正电子对撞机（CEPC）的核心物理目标之一。作为希格斯工厂，CEPC预计将以$ 240 \ $ 240 \ $ GEV $的质量能量运行，提供$ 5.6 \，AB^{ - 1} $的集成发光度，并根据CEPC概念设计报告（CDR）生产100万Higgs Bosons。结合$ \ ell^+\ ell^-h $，$ν\barνH $的测量结果，以及$ q \ bar {q} h $ channels，我们得出结论，$ h \ to b \ bar {b}/c \ bar {c}/gg $的信号强度仅能测量相对准确的（统计不确定性） 0.27 \％/4.03 \％/1.56 \％。外推到最近发布的TDR操作参数对应于$ 20 \，ab^{ - 1} $的集成光度，$ H \ to b \ bar {b}/c \ bar {c}/gg $信号强度为0.14 \％/2.13 \％/0.82 \％。我们分析了预期准确性对关键检测器性能的依赖性：$ q \ bar {q} h $通道的颜色单元识别（CSI）和$ν\barνH $和$ q \ bar {q} h $ Channel的风味标记。我们观察到，与基线CEPC检测器性能相比，理想的风味标记将$ h \提高到b \ bar {b}/c \ bar {c}/gg $信号强度准确性在2 \％/63 \％/13 \％的$ n $ n $ cannel和35 \％/122 \％/122 \％/181/181/181/q f in $ν\％/13 \％。另外，更好的CSI性能可以显着提高信号强度的预期准确性。本文还讨论了相关的系统学。
Accurately measuring the properties of the Higgs boson is one of the core physics objectives of the Circular Electron Positron Collider (CEPC). As a Higgs factory, the CEPC is expected to operate at a centre-of-mass energy of $240\,GeV$, deliver an integrated luminosity of $5.6\,ab^{-1}$, and produce one million Higgs bosons according to the CEPC Conceptual Design Report (CDR). Combining measurements of the $\ell^+\ell^-H$, $ν\barν H$, and $q\bar{q}H$ channels, we conclude that the signal strength of $H\to b\bar{b}/c\bar{c}/gg$ can be measured with a relative accuracy (statistic uncertainty only) of 0.27\%/4.03\%/1.56\%. Extrapolating to the recently released TDR operating parameters corresponding to the integrated luminosity of $20\,ab^{-1}$, the relative accuracy of $H\to b\bar{b}/c\bar{c}/gg$ signal strength is 0.14\%/2.13\%/0.82\%. We analyze the dependence of the expected accuracies on the critical detector performances: Color Singlet Identification (CSI) for the $q\bar{q}H$ channel and flavor tagging for both $ν\barν H$ and $q\bar{q}H$ channels. We observe that compared to the baseline CEPC detector performance, ideal flavor tagging increases the $H\to b\bar{b}/c\bar{c}/gg$ signal strength accuracy by 2\%/63\%/13\% in the $ν\barν H$ channel and 35\%/122\%/181\% in the $q\bar{q}H$ channel. In addition, better performance of CSI can significantly improve the anticipated accuracy of signal strength. The relevant systematics are also discussed in this paper.
