Zobrazeno 1 - 10 of 10 pro vyhledávání: '"Piotr A. Raczka"'
1
Improved evaluation of the next-next-to-leading order QCD corrections toe+e−annihilation into hadrons
Autor: Piotr A. Raczka, Andrzej Szymacha
Publikováno v: Physical Review D. 54:3073-3084
The next-next-to-leading order QCD corrections to {ital e}{sup +}{ital e}{sup {minus}} annihilation into hadrons are considered. The stability of the predictions with respect to change of the renormalization scheme is discussed in detail for the case
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::050db400d036cb382a4e15ee110d5e9d
https://doi.org/10.1103/physrevd.54.3073
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2
Experimental constraints on the neutrino oscillations and a simple model of three-flavor mixing
Autor: Andrzej Szymacha, Stanisław Tatur, Piotr A. Raczka
Publikováno v: Physical Review D. 49:1655-1658
A simple model of the neutrino mixing is considered, which contains only one right-handed neutrino field, coupled via the mass term to the three usual left-handed fields. This is a simplest model that allows for three-flavour neutrino oscillations. T
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3ab134905fdaed3ac13a79351fb69b3a
https://doi.org/10.1103/physrevd.49.1655
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3
Remark on the effect of renormalization scheme dependence on the determination ofΛQCDfrom τ-lepton decay
Autor: Piotr A. Raczka
Publikováno v: Physical Review D. 46:R3699-R3702
The perturbative QCD corrections to the semileptonic decay width of the \ensuremath{\tau} lepton are analyzed in various renormalization schemes. Significant differences are found between a priori admissible schemes, which indicates that it is imposs
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5ca3411f5e2dc286f02b86772d908938
https://doi.org/10.1103/physrevd.46.r3699
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4
Two-loop O(αsGμmt2) corrections to the partial decay width of the Z0 into final states in the large top-mass limit
Autor: Fred Jegerlehner, O.V. Tarasov, Jochem Fleischer, Piotr A. Raczka
Publikováno v: Physics Letters B. 293:437-444
The QCD correction to the one-loop electroweak radiative correction of the partial Z-decay width into b-quarks is calculated analytically in the limit of large top mass. The calculation is performed in the 't Hooft gauge with an arbitrary gauge param
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3727159e7b462e9fce7af9da47a294cb
https://doi.org/10.1016/0370-2693(92)90909-n
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5
Summation of the perturbation expansion and the QCD corrections toτdecay
Autor: Piotr A. Raczka
Publikováno v: Physical Review D. 43:R9-R13
The problem of summation of the perturbation expansion in QCD is discussed. It is argued that this expansion is summable by a modified Borel method. The QCD corrections to the semileptonic width of a heavy lepton are considered as an example. The pos
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4304d5e09ac82d6db120d9f1dd3499a6
https://doi.org/10.1103/physrevd.43.r9
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6
Improved analysis of the renormalization scheme ambiguities in the QCD corrections to the semileptonic decay of the tau lepton
Autor: Andrzej Szymacha, Piotr A. Raczka
The perturbative QCD corrections to the semileptonic decay width of the tau lepton are evaluated in the next-next-to-leading order from the contour integral representation in various renormalization schemes, using numerical solution of the renormaliz
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::87b37fe189f90481e8c2615d0e3b57e9
http://arxiv.org/abs/hep-ph/9412236
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7
Renormalization Scheme Dependence and the Problem of Theoretical Uncertainties in Next-Next-to-Leading Order QCD Predictions
Autor: Piotr A. Raczka
Renormalization scheme uncertainties in the next-next-to-leading order QCD predictions are discussed. To obtain an estimate of these uncertainties it is proposed to compare predictions in all schemes that do not have unnaturally large expansion coeff
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1fb7c09920372a192a241929d8786c73
http://arxiv.org/abs/hep-ph/9407343
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8
Renormalization scheme and gauge dependence of perturbative QCD predictions
Autor: Ryszard Ra̧czka, Piotr A. Raczka
Publikováno v: Physical Review D. 40:878-882
The problem of renormalization scheme and gauge dependence of perturbative QCD predictions in the momentum subtraction schemes is considered. A renormalization-group-improved expression for the QCD contribution to the /sigma//sub /ital T//(e/sup +/e/
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3d4dfd7895d115e7e4ec60e17850834f
https://doi.org/10.1103/physrevd.40.878
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10
Colliding plane waves in non-abelian gauge theory
Autor: Piotr A. Raczka
Publikováno v: Physics Letters B. 177:60-62
A new explicit solution of the classical SU(2) Yang-Mills equations is given. It describes two colliding wave packets, which asymptotically are abelian plane waves localized in the direction of propagation. Although the interaction is nonlinear, the
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c8d2ef683f15429a95fe74fdbaf754ee
https://doi.org/10.1016/0370-2693(86)90014-6
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