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Titolo:
Analytic results for e(+)e(-) -> t(t)over-bar and gamma gamma -> t(t)over-bar observables near the threshold up to the next-to-next-to-leading order of NRQCD
Autore:
Penin, AA; Pivovarov, AA;
Indirizzi:
Univ Karlsruhe, Inst Theoret Teilchenphys, D-76128 Karlsruhe, Germany UnivKarlsruhe Karlsruhe Germany D-76128 hys, D-76128 Karlsruhe, Germany Univ Mainz, Inst Phys, D-55099 Mainz, Germany Univ Mainz Mainz Germany D-55099 ainz, Inst Phys, D-55099 Mainz, Germany
Titolo Testata:
PHYSICS OF ATOMIC NUCLEI
fascicolo: 2, volume: 64, anno: 2001,
pagine: 275 - 293
SICI:
1063-7788(200102)64:2<275:ARFE-T>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
QUARK PAIR PRODUCTION; PRODUCTION NEAR-THRESHOLD; EFFECTIVE-FIELD THEORIES; HEAVY-QUARK; NONRELATIVISTIC QCD; BOUND-STATES; RADIATIVE-CORRECTIONS; B(B)OVER-BAR SYSTEM; PERTURBATION-THEORY; 2-LOOP CORRECTIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
78
Recensione:
Indirizzi per estratti:
Indirizzo: Penin, AA Univ Karlsruhe, Inst Theoret Teilchenphys, Kaiserstr 12, D-76128Karlsruhe, Germany Univ Karlsruhe Kaiserstr 12 Karlsruhe Germany D-76128 , Germany
Citazione:
A.A. Penin e A.A. Pivovarov, "Analytic results for e(+)e(-) -> t(t)over-bar and gamma gamma -> t(t)over-bar observables near the threshold up to the next-to-next-to-leading order of NRQCD", PHYS ATOM N, 64(2), 2001, pp. 275-293

Abstract

We present an analytic description of top-antitop pair production near thethreshold in e(+)e(-) annihilation and gamma gamma collisions. A set of basic observables being considered includes total cross sections, forward-backward asymmetry, and top-quark polarization. Threshold effects relevant to the basic observables are described by three universal functions related toS-wave production, P-wave production, and S-P interference. These functions are computed analytically up to the next-to-next-to-leading order of NRQCD. The total e(+)e(-) --> t (t) over bar cross section near the threshold is obtained in the next-to-next-to-leading order in a closed form including the contribution originating from the axial coupling of top quarks that is mediated by the Z boson. The effects of the running of the strong coupling constant and the finite top-quark width are taken into account analyticallyfor the P-wave production and S-P wave interference. (C) 2001 MAIK "Nauka/Interperiodica".

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Documento generato il 27/05/20 alle ore 14:58:16