Physics at [ital t[bar t]] threshold in [ital e][sup +][ital e][sup [minus]] collisions

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.50.4341· OSTI ID:7033960

Fujii, K; Matsui, T ^[1]; Sumino, Y ^[2]

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1. KEK, Tsukuba 305 (Japan)
2. Department of Physics, University of Tokyo, Tokyo 113 (Japan)

We present the results from quantitative studies of physics at [ital t[bar t]] threshold, taking into account realistic experimental conditions expected at future linear [ital e][sup +][ital e][sup [minus]] colliders. A possible experimental strategy is illustrated for a sample case of [ital m][sub [ital t]]=150 GeV, where the importance of the measurements of both total and differential cross sections is emphasized for precision determinations of various parameters. The studies are based on a recently developed theoretical formalism which includes full [ital O]([alpha][sub [ital s]]) corrections. An energy scan of 11 points with 1 fb[sup [minus]1] each allows us to measure the top mass and the strong coupling constant with statistical errors of [Delta][ital m][sub [ital t]]=0.2 GeV and [Delta][alpha][sub [ital s]]=0.005, respectively. As for the top width, [Delta][Gamma][sub [ital t]]/[Gamma][sub [ital t]]=0.2(stat) is expected, if both [ital m][sub [ital t]] and [alpha][sub [ital s]] are known. The measurement of the top momentum at some optimized energy point with 100 fb[sup [minus]1] reduces the error on [alpha][sub [ital s]] to [Delta][alpha][sub [ital s]]=0.0015, provided that the 1[ital S] peak position is known from the threshold scan. The momentum measurement also improves the precision on the top width to [Delta][Gamma][sub [ital t]]/[Gamma][sub [ital t]]=0.04, if [alpha][sub [ital s]] is known from other sources. The forward-backward asymmetry in the threshold region provides another interesting method to measure [alpha][sub [ital s]] and [Gamma][sub [ital t]].

• OSTI ID: 7033960
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 50:7; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

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662440 -- Properties of Other Particles Including Hypothetical Particles-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BOSONS
CORRECTIONS
COUPLING CONSTANTS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY
ERRORS
HADRONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
MESONS
PARTICLE INTERACTIONS
QUARKONIUM
THRESHOLD ENERGY
TOPONIUM
TOTAL CROSS SECTIONS