Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
THE FERMION-LOOP SCHEME FOR FINITE-WIDTH EFFECTS IN E(-) ANNIHILATIONINTO 4 FERMIONS()E()
Autore:
BEENAKKER W; VANOLDENBORGH GJ; DENNER A; DITTMAIER S; HOOGLAND J; KLEISS R; PAPADOPOULOS CG; PASSARINO G;
Indirizzi:
LEIDEN UNIV,INST LORENTZ LEIDEN NETHERLANDS PAUL SCHERRER INST CH-5303 WURENLINGEN SWITZERLAND PAUL SCHERRER INST VILLIGEN SWITZERLAND UNIV BIELEFELD,INST THEORET PHYS D-4800 BIELEFELD GERMANY NIKHEF H NL-1009 DB AMSTERDAM NETHERLANDS UNIV NIJMEGEN NIJMEGEN NETHERLANDS NRCPS,INST NUCL PHYS ATHENS GREECE UNIV TURIN,DIPARTIMENTO FIS TEOR TURIN ITALY IST NAZL FIS NUCL I-10125 TURIN ITALY
Titolo Testata:
Nuclear physics. B
fascicolo: 1-3, volume: 500, anno: 1997,
pagine: 255 - 298
SICI:
0550-3213(1997)500:1-3<255:TFSFFE>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
GAUGE-INVARIANCE; PHYSICS;
Keywords:
W-PAIR PRODUCTION; FINITE-WIDTH EFFECTS; GAUGE INVARIANCE; WARD IDENTITIES; ELECTROWEAK RADIATIVE CORRECTIONS; NUMERICAL CALCULATIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
W. Beenakker et al., "THE FERMION-LOOP SCHEME FOR FINITE-WIDTH EFFECTS IN E(-) ANNIHILATIONINTO 4 FERMIONS()E()", Nuclear physics. B, 500(1-3), 1997, pp. 255-298

Abstract

We describe the gauge-invariant treatment of the finite-width effectsof W and Z bosons in the fermion-loop scheme and its application to the six-fermion (LEP2) processes e(-)e(+) --> four fermions, with massless external fermions. The fermion-loop scheme consists in including all fermionic one-loop corrections in tree-level amplitudes and resumming the self-energies. We give explicit results for the unrenormalized fermionic one-loop contributions to the gauge-boson self-energies and the triple gauge-boson vertices, and perform the renormalization in a gauge-invariant way by introducing complex pole positions and running couplings. A simple effective Born prescription is presented, which allows for a relatively straightforward implementation of the fermion-loop scheme in LEP1 and LEP2 processes. We apply this prescription to typical LEP2 processes, i.e. e(-)e(+) --> mu(-)<(nu)over bar(mu)>mu (d) over bar, e(-)e(+) --> <s(c)over bar><u(d)over bar>, and e(-)e(+) --> e(-)<(nu)over bar><u(d)over bar>, and give numerical comparisons with other gauge-invariance-preserving schemes in the energy range of LEP2,NLC and beyond. (C) 1997 Published by Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 19:41:58