论文标题
LHC上的$ττ$变化的魅力和希格斯的味道变化的顶部腐烂
Flavor changing top decays to charm and Higgs with $ττ$ at the LHC
论文作者
论文摘要
我们研究了在Cern大型强子撞机（LHC）中发现顶级夸克（$ t \ to c h^0 $）中的顶级夸克（$ t \ to c h^0 $）中的顶级夸克腐烂的前景。采用了一般的两个希格斯双重模型来研究改变风味的中性希格斯（FCNH）相互作用。 We perform a parton level analysis as well as Monte Carlo simulations using \textsc{Pythia}~8 and \textsc{Delphes} to study the flavor changing top quark decay $t \to c h^0$, followed by the Higgs decaying into $τ^+ τ^-$, with the other top quark decaying to a bottom quark ($b$) and two light jets ($t\to bw \ to bjj $）。为了将物理背景减少到希格斯信号中，只使用了tau lept子的松弛衰变，$τ^ +τ^ - \ to e^\pmμ^\ mp +\ \ slashed {e} _t $，其中$ \ slashed {e} _t $代表缺失的横向能量来自中立的横向能量。为了重建希格斯玻色子和顶级夸克质量，并有效地消除了物理背景，采用了高度增强的tau衰变的共线近似。 Our analysis suggests that a high energy LHC at $\sqrt{s} = 27$ TeV will be able to discover this FCNH signal with an integrated luminosity $\mathcal{L} = 3$ ab$^{-1}$ for a branching fraction ${\cal B}(t \to ch^0) \agt 1.4 \times 10^{-4}$ that corresponds to a fcnh耦合$ |λ_{tch} | \ agt 0.023 $。此FCNH耦合大大低于当前地图集的合并上限$ |λ_{TCH} | = 0.064 $。
We investigate the prospects of discovering the top quark decay into a charm quark and a Higgs boson ($t \to c h^0$) in top quark pair production at the CERN Large Hadron Collider (LHC). A general two Higgs doublet model is adopted to study flavor changing neutral Higgs (FCNH) interactions. We perform a parton level analysis as well as Monte Carlo simulations using \textsc{Pythia}~8 and \textsc{Delphes} to study the flavor changing top quark decay $t \to c h^0$, followed by the Higgs decaying into $τ^+ τ^-$, with the other top quark decaying to a bottom quark ($b$) and two light jets ($t\to bW\to bjj$). To reduce the physics background to the Higgs signal, only the leptonic decays of tau leptons are used, $τ^+τ^- \to e^\pmμ^\mp +\slashed{E}_T$, where $\slashed{E}_T$ represents the missing transverse energy from the neutrinos. In order to reconstruct the Higgs boson and top quark masses as well as to effectively remove the physics background, the collinear approximation for the highly boosted tau decays is employed. Our analysis suggests that a high energy LHC at $\sqrt{s} = 27$ TeV will be able to discover this FCNH signal with an integrated luminosity $\mathcal{L} = 3$ ab$^{-1}$ for a branching fraction ${\cal B}(t \to ch^0) \agt 1.4 \times 10^{-4}$ that corresponds to a FCNH coupling $|λ_{tch}| \agt 0.023$. This FCNH coupling is significantly below the current ATLAS combined upper limit of $|λ_{tch}| = 0.064$.
