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

标准希格斯粒子信号与对撞机背景比的理论研究。

• 批准号: 01540240
• 负责人: BIYAJIMA Minoru
• 金额: $ 1.54万
• 依托单位: Shinshu University.
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01540240/
• 关键词: Standard Theory; LEP II; JLC; Higgs particle; 精密実験; LEP II; JLC; TRISTAN; SLC及びLEPI; Z-pole(Z粒子)

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_-.

1989年我们计算了下列过程的信号（S）与背景（BG）之比：（S）：e^-e^+-> Z -> τ τ ^^- + H -> τ + B B ^-喷流，（1）（BG）：e^-e^+-> Z，γ-> f f^^-> τ τ ^- + q q^^-喷流+ X。（2）这里τ，B，f和q分别表示轻子，美夸克，费米子和夸克。我们已经证明了质量范围为20 < M_H < 30 GeV的标准Higgs粒子在M_Z极是可探测的，1990年，我们在此基础上提出了在TRISTAN能量（*s = 60 GeV）下对标准理论的精确检验。[In换句话说，BG中轻子的能量分布可以用于标准理论的检验）。1991年我们计算了LEP Ⅱ和JLC（<square root>s = 300 GeV）的本底（BG 2）：e^-e^+-&gt; V，Z -&gt; V，τ τ ^-（V = Z，gamma）。（3）在考虑各种物理条件的情况下，我们发现过程（1）的信号，即M_H &lt; 85 GeV的标准Higgs粒子，在E_（-1）&gt; 70 GeV的范围内，在（] SY·sqroot）是可以探测到的。]).在轻子dsigma/dE_-的能量分布中，ss = 2M_Z。

项目成果

S.MsMatsumoto: "On bーquark cascade decay including the polarization effect." Phys.Rev.

S.MsMatsumoto：“关于 b 夸克级联衰变，包括极化效应。”

Y. Yoneda, O. Terazawa and M. Biyajima: "Detection of Higgs Boson and Precise Test of the Standard Model in e^- e^+ Annihilation at <square root> s = M_Z." Phys. Rev.D42. 1418 (1990)

Y. Yoneda、O. Terazawa 和 M. Biyajima：“希格斯玻色子的检测和 e^- e^ 湮灭 <square root> s = M_Z 处标准模型的精确测试。”

S.Matsumoto: "Heavy quark polarziation and energy spectrum of decay products in semileptonic decays" Phys.Rev.

S.Matsumoto：“半轻衰变中的重夸克极化和衰变产物的能谱”Phys.Rev。

S.Matsumoto: "Precise test of the standard model in e^-e^+ annihilation at TRISTAN energy √<s> = 60 GeV" Prog.Theor.Phys.85. 631-642 (1991)

S.Matsumoto：“TRISTAN 能量 √<s> = 60 GeV 下 e^-e^+ 湮灭标准模型的精确测试”Prog.Theor.Phys.85 (1991)。

S.Matsumoto: "On b-quark cascade decay including the polarization effect" Phys.Rev.D.

S.Matsumoto：“关于 b 夸克级联衰变，包括极化效应”Phys.Rev.D。