Top and Higgs hunting via M sub W and. Gamma. sub Z
- Dept. of Physics, College of General Education, Univ. of Tokushima, Tokushima 770 (JP)
Virtual top and Higgs effects are studied through the electroweak radiative corrections to the W boson mass, M{sub W} , and the total decay-width of the Z boson, {Gamma}{sub x}, by using the data M{sup exp}{sub Z} = 91.175 {plus minus} 0.021 GeV(LEP), {Gamma}{sup exp}{sub Z} = 2.485 {plus minus} 0.009 GeV(LEP) and M{sup exp}{sub W} = 80.18 {plus minus} 0.32 GeV(CDF + UA2). Carrying out the {chi}{sup 2} fit in the framework of the standard electroweak theory, constraints are derived on the top-quark mass, m{sub t}, and the Higgs-boson mass, m{sub {phi}}, which are almost free from the complicated hadron physics like parton model calculations. For example, m{sub t} = 134{sup +47}{sub {minus}48} GeV for m{sub {phi}} = 100 GeV (at 1{sub {sigma}} level) while m{sub {phi}} {approx lt} 680 if m{sub t} {le} 110 GeV and m{sub {phi}} {approx gt} 280 GeV if m{sub t} {ge} 190 GeV. It is also studied how precise measurements of M{sub W} at LEP II improve these constraints.
- OSTI ID:
- 5195524
- Journal Information:
- Modern Physics Letters A; (Singapore), Vol. 6:23; ISSN 0217-7323
- Country of Publication:
- United States
- Language:
- English
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