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Titolo:
TOP-QUARK POLARIZATION IN POLARIZED E(-) ANNIHILATION NEAR-THRESHOLD()E()
Autore:
HARLANDER R; JEZABEK M; KUHN JH; PETER M;
Indirizzi:
UNIV KARLSRUHE,INST THEORET TEILCHENPHYS,KAISERSTR 12 D-76128 KARLSRUHE GERMANY INST NUCL PHYS PL-30055 KRAKOW POLAND
Titolo Testata:
Zeitschrift fur Physik. C, Particles and fields
fascicolo: 3, volume: 73, anno: 1997,
pagine: 477 - 494
SICI:
0170-9739(1997)73:3<477:TPIPEA>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEAVY QUARKS; NEAR-THRESHOLD; T(T)OVER-BAR PRODUCTION; MOMENTUM DISTRIBUTIONS; PAIR PRODUCTION; LEPTON SPECTRA; DECAYS; E+E; QCD; WIDTH;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
R. Harlander et al., "TOP-QUARK POLARIZATION IN POLARIZED E(-) ANNIHILATION NEAR-THRESHOLD()E()", Zeitschrift fur Physik. C, Particles and fields, 73(3), 1997, pp. 477-494

Abstract

Top quark polarization in e(+)e(-) annihilation into tt is calculatedfor linearly polarized beams. The Green function formalism is appliedto this reaction near threshold. The Lippmann-Schwinger equations forthe S-wave and P-wave Green functions are solved numerically for the QCD chromostatic potential given by the two-loop formula for large momentum transfer and Richardson's ansatz for intermediate and small momenta. S-P-wave interference contributes to all components of the top quark polarization vector. Rescattering of the decay products is considered. The mean values [nl] of the charged lepton four-momentum projections on appropriately chosen directions n in semileptonic top decays are proposed as experimentally observable quantities sensitive to top quark polarization. The results for [nl] are obtained including S-P-waveinterference and rescattering of the decay products. It is demonstrated that for the longitudinally polarized electron beam a highly polarized sample of top quarks can be produced.

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Documento generato il 29/11/20 alle ore 00:39:03