Slight excess at 130 GeV in search for a charged Higgs boson decaying to a charm quark and a bottom quark at the Large Hadron Collider
Slight excess at 130 GeV in search for a charged Higgs boson decaying to a charm quark and a bottom quark at the Large Hadron Collider
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DOI：
10.1088/1361-6471/ac77a6
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发表时间：
2022-02
期刊：
影响因子：
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通讯作者：
A. Akeroyd;S. Moretti;Muyuan Song
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文献类型：
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作者：
A. Akeroyd;S. Moretti;Muyuan Song
在大型强子对撞机（LHC）上，利用顶夸克（$t\to H^\pm B$）的衰变过程，对荷电Higgs玻色子（$H ^\pm$）衰变为粲夸克和底夸克（$H ^\pm \to c B $）的过程进行了观测.在最近的一次搜索中，（所有运行II数据，139 fb$^{-1}$）已观察到约3\sigma $的局部过量，最适合的是带电的希格斯玻色子，（$m_{H^\pm}$）约为130 GeV，分支比（BR）的乘积为BR$（t\to H^\pm B）\x {\rm BR}（H^\pm\to c B）= 0.16\pm 0.06\%$。在具有独立汤川耦合的双希格斯偶模型（2 HDM）的背景下，考虑到LHC在m_{H^\pm}$=130 GeV时对$H^\pm\to cs$和$H^\pm\to \tau\nu$的搜索限制以及从$B\to s\gamma$的约束，我们给出了可以容纳这种过剩（假设它是真的）的参数空间。然后，它表明，这种过剩不能解释在2 HDMs与自然风味的保护，但可以容纳在翻转的三希格斯双重模型（3 HDM）和对齐的2 HDM（A2 HDM）。接下来在通道$H^\pm\to cb$（CMS）、$H^\pm\to cs$（ATLAS/CMS）和$H^\pm \to \tau\nu$（ATLAS/CMS）中搜索139 fb$^{-1}$，将确定过量是否是$H^\pm$的第一个符号，其中$m_{H^\pm}=130$ GeV。
Searches for a charged Higgs boson ($H^\pm$) decaying to a charm quark and a bottom quark ($H^\pm \to cb$) have been carried out at the Large Hadron Collider (LHC) in the decay of top quarks ($t\to H^\pm b$). In a recent search by the ATLAS collaboration (with all Run II data, 139 fb$^{-1}$) a local excess of around $3\sigma$ has been observed, which is best fitted by a charged Higgs boson with a mass ($m_{H^\pm}$) of around 130 GeV and a product of branching ratios (BRs) given by BR$(t\to H^\pm b)\times{\rm BR}(H^\pm\to cb)=0.16\%\pm 0.06\%$. In the context of Two-Higgs-Doublet Models (2HDM) with independent Yukawa couplings for $H^\pm$ we present the parameter space for which this excess (assuming it to be genuine) can be accommodated, taking into account the limits from LHC searches for $H^\pm\to cs$ and $H^\pm\to \tau\nu$ at $m_{H^\pm}$=130 GeV and the constraint from $b\to s\gamma$. It is then shown that such an excess cannot be explained in 2HDMs with natural flavour conservation, but can be accommodated in the flipped Three-Higgs-Doublet Model (3HDM) and in the aligned 2HDM (A2HDM). Upcoming searches with 139 fb$^{-1}$ in the channels $H^\pm\to cb$ (CMS), $H^\pm \to cs$ (ATLAS/CMS) and $H^\pm \to \tau\nu$ (ATLAS/CMS) will determine if the excess is the first sign of an $H^\pm$ with $m_{H^\pm}=130$ GeV.