arXiv 2101.008642021-01hep-ph

未来轻子对撞机上2 HDM I型中性希格斯玻色子衰变到$b\bar{b}$的运动学修正和重建方法

Kinematic corrections and reconstruction methods for neutral Higgs boson decay to $b\bar{b}$ in 2HDM type-I at future lepton colliders

Majid Hashemi, Elnaz Ebrahimi

备注：: 13 pages
发表信息：: Phys. Rev. D 103, 115008 (2021)
DOI：: 10.1103/PhysRevD.103.115008

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摘要：

本文描述了在$ \sqrt{s}=1$ TeV正负电子对撞机上基于2 HDM Ⅰ型的中性Higgs玻色子搜索方法。假设光束是非偏振的，并包括快速探测器模拟。信号过程通过$ e^{+}e^{-}\rightarrow AH\rightarrow b\bar{b}b\bar{b} $产生一个完全的强子末态，其中CP偶希格斯玻色子和CP奇希格斯玻色子（$H$和$A$）被假定衰变为一对$b$喷注。几个基准的情况下，介绍了作为基线的分析采取$ m_{H/A}$在150- 300 GeV的范围。为了避免希格斯玻色子转换$A \to ZH$，用$m_A-m_H < m_Z$选择了希格斯玻色子质量。结果表明，通过对末态$b$ -喷注四动量进行适当的运动学修正，通过$b\bar{b}$不变质量计算，可以找到真实的$b$ -喷注组合来同时重构两个Higgs玻色子.结果表明，在目标积分光度为8 $ab^{-1}$之前，可以获得具有超过$5σ$的统计显著性的可观测信号。

英文摘要：

In this paper, an approach for neutral Higgs bosons search is described based on 2HDM type-I at electron-positron linear colliders operating at $ \sqrt{s}=1$ TeV. The beam is assumed to be unpolarized and fast detector simulation is included. The signal process produces a fully hadronic final state through $ e^{+}e^{-}\rightarrow AH\rightarrow b\bar{b}b\bar{b} $ where both CP-even and CP-odd Higgs bosons ($H$ and $A$) are assumed to decay to a pair of $b$-jets. Several benchmark scenarios are introduced as the baseline for the analysis taking $ m_{H/A}$ in the range 150--300 GeV. In order to avoid Higgs boson conversion $A \to ZH$, Higgs boson masses are chosen with $m_A-m_H < m_Z$. It is shown that with a proper kinematic correction applied on final state $b$-jet four momenta, true combinations of $b$-jets can be found for simultaneous reconstruction of both Higgs bosons through $b\bar{b}$ invariant mass calculation. Results show that observable signals can be achieved with statistical significance exceeding $5σ$ well before the target integrated luminosity of 8 $ab^{-1}$.

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