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Titolo:
ON A SEMIANALYTICAL AND REALISTIC APPROACH TO E- ANNIHILATION INTO FERMION PAIRS AND TO BHABHA SCATTERING WITHIN THE MINIMAL STANDARD MODELAT LEP ENERGIES(E)
Autore:
MONTAGNA G; PICCININI F; NICROSINI O; PASSARINO G; PITTAU R;
Indirizzi:
UNIV PAVIA,DIPARTIMENTO FIS NUCL & TEOR I-27100 PAVIA ITALY INFN PAVIA ITALY UNIV TURIN,DIPARTIMENTO FIS TEOR I-10124 TURIN ITALY INFN TURIN ITALY
Titolo Testata:
Nuclear physics. B
fascicolo: 1-2, volume: 401, anno: 1993,
pagine: 3 - 66
SICI:
0550-3213(1993)401:1-2<3:OASARA>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRECISION ELECTROWEAK EXPERIMENTS; ORDER RADIATIVE-CORRECTIONS; HARD PHOTON CORRECTIONS; MW-MZ INTERDEPENDENCE; WEAK MIXING ANGLE; QED CORRECTIONS; Z0 RESONANCE; INDEPENDENT ANALYSIS; COLLINEAR PHOTONS; MASS CORRECTIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
137
Recensione:
Indirizzi per estratti:
Citazione:
G. Montagna et al., "ON A SEMIANALYTICAL AND REALISTIC APPROACH TO E- ANNIHILATION INTO FERMION PAIRS AND TO BHABHA SCATTERING WITHIN THE MINIMAL STANDARD MODELAT LEP ENERGIES(E)", Nuclear physics. B, 401(1-2), 1993, pp. 3-66

Abstract

Theoretical predictions for the annihilation of e+e- into fermion pairs as well as for e+e- --> e+e- around the Z0 peak are reported. Different observables are considered, including the possibility of a realistic set-up for LEP physics, i.e. with cuts on acollinearity angle, energies or invariant mass and angular acceptance for the outgoing fermions. Pure weak corrections at the one-loop level are included in the formulation and leading higher order corrections due to a potentially large top quark mass are taken into account. Depending on the experimental set-up the initial state QED corrections are included by a convolution of the weakly corrected kernel distributions with a radiator function or with structure functions, where resummation of soft photon effects and hard photon emission up to O(alpha2) are taken into account. Final state QED radiation, even in the presence of kinematical cuts, istreated analytically and exactly at O(alpha), and higher order contributions are taken into account. QCD effects are discussed for the parameters of the Z0 resonance and for s-dependent quantities. Results andconsiderations for quantities which are physically observable at LEP are presented and discussed. The interplay with the experimental results is shown through an analysis of the LEP data, both at the level of the Z0 parameters as given by the four LEP collaborations and at the level of the published results for the lineshape and asymmetry data. Asa consequence constraints on the unknown parameters of the minimal standard model are deduced and analyzed. The features of a new semi-analytical computer program (TOPAZ0), which includes all the physical effects previously discussed, are briefly introduced. The numerical relevance of recently proposed higher order corrections, as initial state leptonic and hadronic pair production or O(G(F)2m(t)4), O(alpha(S)G(F)m(t)2), O(alpha(S)3), is analyzed in detail. A careful comparison with the existing programs is shown, indicating the overall agreement in thelight of the present experimental errors and within the same choice of parameters, kinematical cuts and correction factor.

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Documento generato il 30/11/20 alle ore 20:08:20