Theoretical Study on Ratio of Signal of Standard Higgs particle to Background at Colliders.

1989年，我们计算了以下过程的信号(S)和背景（BG）之比：(S): e^-e^+-> Z -> tau tau^^- + H -> tau + b b^^-喷流，(1)(BG): e^-e^+-> Z, γ -> f f^ - -> tau tau^^- + q q^ -喷流+ x。(2)这里的tau， b， f和q分别表示轻子，美夸克，费米子和夸克。我们已经证明，质量范围为20 < M_H < 30 GeV的标准希格斯粒子可以在m_z极被探测到。1990年，在前人研究成果的基础上，我们提出了在TRISTAN能量（*s = 60 GeV）下对标准理论的精确测试。（换句话说，BG中轻子的能量分布可以用来检验标准理论）。其次，我们计算了LEP II和JLC的S与BG的比率（<平方根> S = 300 GeV）。1991年，我们计算了以下背景（BG2），主要贡献于LEP II(BG2): e^-e^+-> V, Z -> V, tau tau^^- (V = Z, γ)。(3)考虑到各种物理条件，我们发现过程(1)的信号，即M_H < 85 GeV的标准希格斯粒子，在（]SY.sqroot）的E_- > 70 GeV区域可以被探测到。])。轻子dsigma/dE_-的能量分布中ss = 2M_Z。

In 1989 we calclulated a ratio of the signal(S) and background (BG) of the following processes :(S) : e^-e^+-> Z -> tau tau^^- + H -> tau + b b^^- jets, (1)(BG) : e^-e^+-> Z, gamma -> f f^^- -> tau tau^^- + q q^^- jets + X. (2)Here tau, b, f and q denote the lepton, beauty quark, fermion and quark, respectively. We have shown that the standard Higgs particle with the mass range, 20 < M_H < 30 GeV, can be detectable at M_Z-pole.In 1990, based on our previous results, we proposed a precise test of the standard theory at TRISTAN energy (*s = 60 GeV). [In other words, the energy distribution of the leptons in the BG can be used for a test of the standard theory). Secondly we calculated the ratio of the S to BG at LEP II and JLC (<square root>s = 300 GeV).In 1991 we calculated the following background (BG2) which mainly contributes at LEP II(BG2) : e^-e^+-> V, Z -> V, tau tau^^- (V = Z, gamma). (3)Taking into account various physical conditions, we found that the signal of the process (1), the standard Higgs particle with M_H < 85 GeV, can be detectable in the region of E_- > 70 GeV at (]SY.sqroot. ]). ss = 2M_Z in the energy distribution of lepton dsigma/dE_-.