On the Observation Effects of Higgs Particle in e+e—→bb Z0 and tt－Z0 at LEP Ⅱ and NLC

Ding Yibing; Li Xueqian; Wang Jianxiong; Zhang Zhaoxi; Xie Yuehong

Chinese Physics C> 1996, Vol. 20> Issue(11) : 982-990

On the Observation Effects of Higgs Particle in e⁺e^—→bb Z⁰ and tt－Z⁰ at LEP Ⅱ and NLC

Department of Physics, Graduate School, The Chinese Academy of Sciences, Beijing 1000392 Department of Physics, Nankai University, Tianjin 3000713 Institute of High Energy Physics, The Chinese Academy of Sciences ,Beijing 1000394 Institute of Theoretical Physics, The Chinese Academy of Sciences ,Beijing 100080

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Abstract：
According to the Minimal Standard Model and the Extended Standard Model with two Higgs doublets, we calculated the total cross sections and differential cross sections for the e⁺e^—→bb Z⁰ and tt－Z⁰ at the LEP Ⅱ and NLC energies in order tO study the possible observational effects of the Higgs particle. We found that the observation for the e⁺e^—→bb Z⁰ can give the information on the Higgs particle as long as the mass of the Higgs particle M_H≤140GeV. However, for the e⁺e^—→tt－Z⁰ the effect from Higgs particle will be completely suppressed by the electrowead background and cannot be observed, no matter whether the Higgs particle is heavy or light.

References

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CDF Collaboration,iPhys/i,iRev/i,iLett/i,74（1995）2626;DoCollaboration,iPhys/i iRev/iiLett/i,74（1995）2632.[2] J.Gunion,H.Haber,G.Kane iet al/i,The Higgs Hunter's Guide,Addison-Wesley Pub.Co.（1990）NewYork.[3] E.Boos,M.Dubinin,iPhys/i,iLett/i.B（1993）147.[4] A.Stange,W.Brock,iPhys/i,iRev/i,D48（1993）2054;C.Geng,P.Turcotte,WHou,iPhys/iiLett/i,B339（1994）317.[5] V.Barger,J.Hewett,R,Phillips,iPhys/i,iRev/i,D41（1990）3421;J.Hewett,SLAC.PUB,6521（1994）.[6] A.Grant,EFI-94-24.[7] A.Sopezak,CERN-PPE/94-73and references in the paper.[8] C.-H.Chang,X-Q.Li,J.-X.Wang iet al/i,iPhys/i,iLett/i,B313（1993）389.

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Ding Yibing, Li Xueqian, Wang Jianxiong, Zhang Zhaoxi and Xie Yuehong. On the Observation Effects of Higgs Particle in e⁺e^—→bb Z⁰ and tt－Z⁰ at LEP Ⅱ and NLC[J]. Chinese Physics C, 1996, 20(11): 982-990.

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Received: 1900-01-01
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

On the Observation Effects of Higgs Particle in e⁺e^—→bb Z⁰ and tt－Z⁰ at LEP Ⅱ and NLC

Corresponding author: Ding Yibing,

Department of Physics, Graduate School, The Chinese Academy of Sciences, Beijing 1000392 Department of Physics, Nankai University, Tianjin 3000713 Institute of High Energy Physics, The Chinese Academy of Sciences ,Beijing 1000394 Institute of Theoretical Physics, The Chinese Academy of Sciences ,Beijing 100080

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1996-11-05

Abstract: According to the Minimal Standard Model and the Extended Standard Model with two Higgs doublets, we calculated the total cross sections and differential cross sections for the e⁺e^—→bb Z⁰ and tt－Z⁰ at the LEP Ⅱ and NLC energies in order tO study the possible observational effects of the Higgs particle. We found that the observation for the e⁺e^—→bb Z⁰ can give the information on the Higgs particle as long as the mass of the Higgs particle M_H≤140GeV. However, for the e⁺e^—→tt－Z⁰ the effect from Higgs particle will be completely suppressed by the electrowead background and cannot be observed, no matter whether the Higgs particle is heavy or light.