Hunting for a possible Higgs-like boson beyond the Standard Model

Hunting for a possible Higgs-like boson beyond the Standard Model
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寻找标准模型之外可能的类希格斯玻色子

DOI:
10.1103/physrevd.102.095008
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发表时间:
2020-05
期刊:
影响因子:
5
通讯作者:
Xue-Qian Li
Xue-Qian Li
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Xing-Dao Guo;Jian-Wen Zhu;Ren-You Zhang;Shu-Min Zhao;Wen-Gan Ma;Xue-Qian Li

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最近一项基于Durgut在美国物理学会网站上的报告的初步调查表明,在LHC质心能量为$7$和$8~ {\rm TeV}$时,在$\Upsilon l^+l^- ~ (l = e,\, \mu)$的不变质量分布中存在$18.4~ {\rm GeV}$的结构。它的出现引起了高能物理学理论家和实验家的关注,因为它可能是一种18.4~ {\rm GeV}$的类希格斯玻色子,它将成为超越标准模型的新物理的信号。我们基于量子场论对相应的量(产生率和衰减率)进行了计算,并与实验数据进行了比较。我们的数值结果不支持这样的断言,即$18.4~ {\rm GeV}$峰对应于一个中性的$0^{++}$玻色子,它衰变成$\Upsilon l^+l^-$。我们迫切需要进一步的研究(包括实验和理论)。
A recent preliminary investigation based on Durgut's report at the American Physical Society site shows a structure at $18.4~ {\rm GeV}$ exists in the invariant mass distribution of $\Upsilon l^+l^- ~ (l = e,\, \mu)$ at the LHC center-of-mass energy of $7$ and $8~ {\rm TeV}$. Its appearance attracts attention of theorists and experimentalists of high energy physics, because it might be a Higgs-like boson of $18.4~ {\rm GeV}$ which would serve as a signal of the new physics beyond the Standard Model. We have carried out computations on the corresponding quantities (production and decay rates) based on quantum field theory and compared the results with experimental data. Our numerical results do not support the assertion that the $18.4~ {\rm GeV}$ peak corresponds to a neutral $0^{++}$ boson which decays into $\Upsilon l^+l^-$. Much further works (both experimental and theoretical) are badly needed.
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