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Titolo: Analytic results for e(+)e() > t(t)overbar and gamma gamma > t(t)overbar observables near the threshold up to the nexttonexttoleading order of NRQCD
Autore: Penin, AA; Pivovarov, AA;
 Indirizzi:
 Univ Karlsruhe, Inst Theoret Teilchenphys, D76128 Karlsruhe, Germany UnivKarlsruhe Karlsruhe Germany D76128 hys, D76128 Karlsruhe, Germany Univ Mainz, Inst Phys, D55099 Mainz, Germany Univ Mainz Mainz Germany D55099 ainz, Inst Phys, D55099 Mainz, Germany
 Titolo Testata:
 PHYSICS OF ATOMIC NUCLEI
fascicolo: 2,
volume: 64,
anno: 2001,
pagine: 275  293
 SICI:
 10637788(200102)64:2<275:ARFET>2.0.ZU;2P
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 QUARK PAIR PRODUCTION; PRODUCTION NEARTHRESHOLD; EFFECTIVEFIELD THEORIES; HEAVYQUARK; NONRELATIVISTIC QCD; BOUNDSTATES; RADIATIVECORRECTIONS; B(B)OVERBAR SYSTEM; PERTURBATIONTHEORY; 2LOOP 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, D76128Karlsruhe, Germany Univ Karlsruhe Kaiserstr 12 Karlsruhe Germany D76128 , Germany



 Citazione:
 A.A. Penin e A.A. Pivovarov, "Analytic results for e(+)e() > t(t)overbar and gamma gamma > t(t)overbar observables near the threshold up to the nexttonexttoleading order of NRQCD", PHYS ATOM N, 64(2), 2001, pp. 275293
Abstract
We present an analytic description of topantitop pair production near thethreshold in e(+)e() annihilation and gamma gamma collisions. A set of basic observables being considered includes total cross sections, forwardbackward asymmetry, and topquark polarization. Threshold effects relevant to the basic observables are described by three universal functions related toSwave production, Pwave production, and SP interference. These functions are computed analytically up to the nexttonexttoleading order of NRQCD. The total e(+)e() > t (t) over bar cross section near the threshold is obtained in the nexttonexttoleading 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 topquark width are taken into account analyticallyfor the Pwave production and SP wave interference. (C) 2001 MAIK "Nauka/Interperiodica".
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Documento generato il 09/04/20 alle ore 10:21:16