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Titolo:
Single-W production and Fermion-Loop scheme: numerical results
Autore:
Passarino, G;
Indirizzi:
Univ Turin, Dipartimento Fis Teor, Turin, Italy Univ Turin Turin ItalyUniv Turin, Dipartimento Fis Teor, Turin, Italy Ist Nazl Fis Nucl, Sezione Torino, I-10125 Turin, Italy Ist Nazl Fis NuclTurin Italy I-10125 zione Torino, I-10125 Turin, Italy
Titolo Testata:
NUCLEAR PHYSICS B
fascicolo: 1-2, volume: 578, anno: 2000,
pagine: 3 - 26
SICI:
0550-3213(20000703)578:1-2<3:SPAFSN>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
(UN)STABLE W+W PRODUCTION; MONTE-CARLO PROGRAM; E(+)E(-) COLLISIONS; 4-FERMION PHYSICS; PAIR PRODUCTION; LEP; ENERGIES; ANNIHILATION; PREDICTIONS; COUPLINGS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
60
Recensione:
Indirizzi per estratti:
Indirizzo: Passarino, G Univ Turin, Dipartimento Fis Teor, Turin, Italy Univ Turin Turin Italy Dipartimento Fis Teor, Turin, Italy
Citazione:
G. Passarino, "Single-W production and Fermion-Loop scheme: numerical results", NUCL PHYS B, 578(1-2), 2000, pp. 3-26

Abstract

The single-W production mechanism is synonymous to the e(+)e(-) annihilation into eve and a W boson with the outgoing electron lost in a small cone around the beam direction. It requires a renormalization scheme that preserves gauge invariance and fermion masses cannot be neglected in the calculation. A recently proposed generalization of the so-called Fenmion-Loop schemeis applied to the evaluation of observables at LEP 2 energies. The total contribution to single-W processes can be split, in a gauge invariant manner, into a s-channel component and a t-channel one. The latter is dominated by a regime of low momentum transfer of the outgoing electron and any high-energy renormalization scheme, as the GF-one, fails to give the correct description of the scale. The Fermion-Loop scheme automatically converts, amongother things, all couplings of the theory into couplings that are running at the appropriate scale. Therefore, in addition to represent the only scheme fully justified on a held-theoretical basis, the Fermion-Loop is the best starting point to include radiative corrections into single-W production. Numerical results are presented, showing a decrease in the predictions that can be sizeable. There is no naive and overall rescaling of alpha(QED) inany pragmatic scheme, as the Fixed-Width one, that can reproduce the Fermion-Loop results, at the requested accuracy, for all configurations and for all kinematical cuts. (C) 2000 Elsevier Science B.V. All rights reserved.

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Documento generato il 23/11/20 alle ore 20:21:05