scholarly journals Covariant calculation of mesonic baryon decays

2005 ◽  
Vol 72 (1) ◽  
Author(s):  
T. Melde ◽  
W. Plessas ◽  
R. F. Wagenbrunn
Keyword(s):  
Covariant Calculation

scholarly journals Covariant calculation of a two-loop test of nonrelativistic QCD factorization

2020 ◽  
Vol 101 (9) ◽  
Author(s):  
Geoffrey T. Bodwin ◽  
Hee Sok Chung ◽  
June-Haak Ee ◽  
U-Rae Kim ◽  
Jungil Lee
Keyword(s):  
Qcd Factorization ◽  
Nonrelativistic Qcd ◽  
Covariant Calculation

Covariant calculation of K+ production in nucleus-nucleus collisions at SIS-energies

1992 ◽  
Vol 541 (3) ◽  
pp. 507-524 ◽  
Author(s):  
Andreas Lang ◽  
Wolfgang Cassing ◽  
Ulrich Mosel ◽  
Klaus Weber
Keyword(s):  
Covariant Calculation

Covariant calculation of the properties off2mesons in a generalized Nambu–Jona-Lasinio model

1999 ◽  
Vol 60 (3) ◽  
Author(s):  
L. S. Celenza ◽  
Bo Huang ◽  
Huangsheng Wang ◽  
C. M. Shakin
Keyword(s):  
Covariant Calculation

scholarly journals Modern methods of calculations of bremsstrahlung in the interaction of elementary particles

2020 ◽  
Vol 56 (4) ◽  
pp. 436-448
Author(s):  
I. A. Shershan ◽  
T. V. Shishkina
Keyword(s):  
Dimensional Regularization ◽  
Good Choice ◽  
Radiative Corrections ◽  
Divergent Part ◽  
Calculation Algorithm ◽  
Covariant Calculation ◽  
Modern Methods ◽  
Theoretical Predictions ◽  
Electron Photon ◽  
Infrared Divergences

. The problem of real bremsstrahlung calculation is considered using the modern methods of regularization of divergencies. In particular, we calculate soft photon bremsstrahlung in the most general form using the method of dimensional regularization of infrared divergences. The general calculation algorithm of hard photon bremsstrahlung is described. It is shown that the contribution of hard bremsstrahlung can be separated into the finite and divergent parts. The divergent part can be factorized with the contribution of the initial process in the Born approximation. It is shown that a good choice of kinematic variables makes an analytic covariant calculation of the divergent part of the hard bremsstrahlung possible. In a particular case, an algorithm for determining the kinematic constraints on the invariants is described. A numerical analysis of the radiative corrections for gauge bosons production processes in the case of electron-photon collisions is performed. It is discovered that the contribution of the finite part of bremsstrahlung at high collision energies reaches 20 per cent and must be taken into account in calculations of radiative corrections. The results obtained can be used in various calculations, including covariant ones, performed in the context of confirmation of the Standard Model theoretical predictions or searching for manifestations of alternative gauge models.

Covariant calculation of the nucleon and nucleon → Δ form factor

2008 ◽  
Vol 44 (1-4) ◽  
pp. 7-10
Author(s):  
F. Gross ◽  
G. Ramalho ◽  
M. T. Peña
Keyword(s):  
Form Factor ◽  
Covariant Calculation

Covariant calculation of matrix elements

1980 ◽  
Vol 23 (2) ◽  
pp. 100-111
Author(s):  
F. I. Fedorov
Keyword(s):  
Matrix Elements ◽  
Covariant Calculation

Radiative Corrections and Polarization Effects to Møller Scattering

2003 ◽  
Vol 18 (16) ◽  
pp. 2807-2815
Author(s):  
V. A. Mossolov ◽  
N. M. Shumeiko ◽  
J. G. Suarez
Keyword(s):  
Numerical Analysis ◽  
Soft Photon ◽  
Beam Polarization ◽  
Radiative Corrections ◽  
Hard Photon ◽  
Polarization Effects ◽  
Polarization Measurements ◽  
Moller Scattering ◽  
Covariant Calculation

Polarization effects including radiative corrections have been considered. Exact lowest-order covariant calculation of QED RC has been carried out and detailed numerical analysis is given. The hard photon contribution is calculated analytically. Exponentation procedure is used to consider multi-soft-photon contribution. Numerical analysis is perfomed for beam polarization measurements at Møller polarimeter.

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