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Titolo:
FINAL-STATE INTERACTIONS IN E(-)-]T(T)OVER-BAR-]BL(+)NU(B)OVER-BARW(-) NEAR THE TOP-QUARK THRESHOLD()E()
Autore:
PETER M; SUMINO Y;
Indirizzi:
UNIV HEIDELBERG,INST THEORET PHYS,PHILOSOPHENWEG 16 D-69120 HEIDELBERG GERMANY UNIV KARLSRUHE,INST THEORET TEILCHENPHYS D-76128 KARLSRUHE GERMANY
Titolo Testata:
Physical review. D. Particles and fields
fascicolo: 11, volume: 57, anno: 1998,
pagine: 6912 - 6927
SICI:
0556-2821(1998)57:11<6912:FIIE>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEAVY UNSTABLE PARTICLES; NEAR-THRESHOLD; MOMENTUM DISTRIBUTIONS; T(T)OVER-BAR PRODUCTION; E+E-ANNIHILATION; PAIR PRODUCTION; DECAY; WIDTH; QCD; PHYSICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
M. Peter e Y. Sumino, "FINAL-STATE INTERACTIONS IN E(-)-]T(T)OVER-BAR-]BL(+)NU(B)OVER-BARW(-) NEAR THE TOP-QUARK THRESHOLD()E()", Physical review. D. Particles and fields, 57(11), 1998, pp. 6912-6927

Abstract

We calculate final-state interaction corrections to the energy-angular distribution of l(+) in semileptonic top quark decay, where the parent top quark is produced via e(+)e(-)-->t (t) over bar near threshold. These are the corrections due to gluon exchange between t and (b) over bar((t) over bar and b) and between b and (b) over bar. Combining with other previously known corrections, we explicitly write down the l() energy-angular distribution including the full O(alpha(s)) = O(beta) corrections near the t (t) over bar threshold. Numerical analyses ofthe final-state interaction corrections are given. We find that they deform the l(+) distribution typically at the 10% level. We also find that all qualitative features of the numerical results can be understood from intuitive pictures. The mechanisms of various effects of the final-state interactions are elucidated. Finally we define an observable which is proper to the decay process of the top quark (dependent only on d Gamma(t-->bl+v)/dE(1)d Omega(1) of a free polarized top quark) near the t (t) over bar threshold. Such a quantity will be useful in extracting the decay properties of the top quark using the highly polarized top quark samples.

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Documento generato il 28/11/20 alle ore 22:57:13