The Experts below are selected from a list of 153 Experts worldwide ranked by ideXlab platform
T Riemann - One of the best experts on this subject based on the ideXlab platform.
-
off shell w pair production in e e annihilation initial state radiation
arXiv: High Energy Physics - Phenomenology, 1995Co-Authors: Dmitri Yu Bardin, M S Bilenky, A Olchevski, T RiemannAbstract:With a current-splitting technique, we calculate the gauge-invariant initial-state radiation to order \oalf\ with soft-photon exponentiation for on- and off-shell $W$-pair production. This result generalizes the Convolution Formula, which is known from the description of the $Z$ resonance, to the case of the production of two $W$-bosons. After up to eightfold analytical integrations, a sufficiently smooth integral over three invariant masses remains to be treated numerically. Including the Coulomb singularity, the largest corrections are covered. We discuss the corrections in a large energy range up to $\sqrt{s}$=1~TeV and draw numerical conclusions on their influence on the $W$-mass determination at LEP~200. Table~1 and figure~5 are revised after correcting the analytical Formulae for the nonuniversal corrections.
-
off shell w pair production in e e annihilation initial state radiation
Physics Letters B, 1993Co-Authors: Dmitri Yu Bardin, M S Bilenky, A Olchevski, T RiemannAbstract:Abstract With a current-splitting technique, we calculate the gauge-invariant initial-state radiation to order O(α) with soft-photon exponentiation for on- and off-shell W -pair production. This result generalizes the Convolution Formula, which is known from the description of the Z resonance, to the case of the production of two W -bosons. After up to eightfold analytical integrations, a sufficiently smooth integral over three invariant masses remains to be treated numerically. Including the Coulomb singularity, the largest corrections are covered. We discuss the corrections in a large energy range up to √ s = 1 TeV and draw numerical conclusions on their influence on the W -mass determination at LEP 200.
M S Bilenky - One of the best experts on this subject based on the ideXlab platform.
-
off shell w pair production in e e annihilation initial state radiation
arXiv: High Energy Physics - Phenomenology, 1995Co-Authors: Dmitri Yu Bardin, M S Bilenky, A Olchevski, T RiemannAbstract:With a current-splitting technique, we calculate the gauge-invariant initial-state radiation to order \oalf\ with soft-photon exponentiation for on- and off-shell $W$-pair production. This result generalizes the Convolution Formula, which is known from the description of the $Z$ resonance, to the case of the production of two $W$-bosons. After up to eightfold analytical integrations, a sufficiently smooth integral over three invariant masses remains to be treated numerically. Including the Coulomb singularity, the largest corrections are covered. We discuss the corrections in a large energy range up to $\sqrt{s}$=1~TeV and draw numerical conclusions on their influence on the $W$-mass determination at LEP~200. Table~1 and figure~5 are revised after correcting the analytical Formulae for the nonuniversal corrections.
-
off shell w pair production in e e annihilation initial state radiation
Physics Letters B, 1993Co-Authors: Dmitri Yu Bardin, M S Bilenky, A Olchevski, T RiemannAbstract:Abstract With a current-splitting technique, we calculate the gauge-invariant initial-state radiation to order O(α) with soft-photon exponentiation for on- and off-shell W -pair production. This result generalizes the Convolution Formula, which is known from the description of the Z resonance, to the case of the production of two W -bosons. After up to eightfold analytical integrations, a sufficiently smooth integral over three invariant masses remains to be treated numerically. Including the Coulomb singularity, the largest corrections are covered. We discuss the corrections in a large energy range up to √ s = 1 TeV and draw numerical conclusions on their influence on the W -mass determination at LEP 200.
Dmitri Yu Bardin - One of the best experts on this subject based on the ideXlab platform.
-
off shell w pair production in e e annihilation initial state radiation
arXiv: High Energy Physics - Phenomenology, 1995Co-Authors: Dmitri Yu Bardin, M S Bilenky, A Olchevski, T RiemannAbstract:With a current-splitting technique, we calculate the gauge-invariant initial-state radiation to order \oalf\ with soft-photon exponentiation for on- and off-shell $W$-pair production. This result generalizes the Convolution Formula, which is known from the description of the $Z$ resonance, to the case of the production of two $W$-bosons. After up to eightfold analytical integrations, a sufficiently smooth integral over three invariant masses remains to be treated numerically. Including the Coulomb singularity, the largest corrections are covered. We discuss the corrections in a large energy range up to $\sqrt{s}$=1~TeV and draw numerical conclusions on their influence on the $W$-mass determination at LEP~200. Table~1 and figure~5 are revised after correcting the analytical Formulae for the nonuniversal corrections.
-
off shell w pair production in e e annihilation initial state radiation
Physics Letters B, 1993Co-Authors: Dmitri Yu Bardin, M S Bilenky, A Olchevski, T RiemannAbstract:Abstract With a current-splitting technique, we calculate the gauge-invariant initial-state radiation to order O(α) with soft-photon exponentiation for on- and off-shell W -pair production. This result generalizes the Convolution Formula, which is known from the description of the Z resonance, to the case of the production of two W -bosons. After up to eightfold analytical integrations, a sufficiently smooth integral over three invariant masses remains to be treated numerically. Including the Coulomb singularity, the largest corrections are covered. We discuss the corrections in a large energy range up to √ s = 1 TeV and draw numerical conclusions on their influence on the W -mass determination at LEP 200.
A Olchevski - One of the best experts on this subject based on the ideXlab platform.
-
off shell w pair production in e e annihilation initial state radiation
arXiv: High Energy Physics - Phenomenology, 1995Co-Authors: Dmitri Yu Bardin, M S Bilenky, A Olchevski, T RiemannAbstract:With a current-splitting technique, we calculate the gauge-invariant initial-state radiation to order \oalf\ with soft-photon exponentiation for on- and off-shell $W$-pair production. This result generalizes the Convolution Formula, which is known from the description of the $Z$ resonance, to the case of the production of two $W$-bosons. After up to eightfold analytical integrations, a sufficiently smooth integral over three invariant masses remains to be treated numerically. Including the Coulomb singularity, the largest corrections are covered. We discuss the corrections in a large energy range up to $\sqrt{s}$=1~TeV and draw numerical conclusions on their influence on the $W$-mass determination at LEP~200. Table~1 and figure~5 are revised after correcting the analytical Formulae for the nonuniversal corrections.
-
off shell w pair production in e e annihilation initial state radiation
Physics Letters B, 1993Co-Authors: Dmitri Yu Bardin, M S Bilenky, A Olchevski, T RiemannAbstract:Abstract With a current-splitting technique, we calculate the gauge-invariant initial-state radiation to order O(α) with soft-photon exponentiation for on- and off-shell W -pair production. This result generalizes the Convolution Formula, which is known from the description of the Z resonance, to the case of the production of two W -bosons. After up to eightfold analytical integrations, a sufficiently smooth integral over three invariant masses remains to be treated numerically. Including the Coulomb singularity, the largest corrections are covered. We discuss the corrections in a large energy range up to √ s = 1 TeV and draw numerical conclusions on their influence on the W -mass determination at LEP 200.
Lopez G Castro - One of the best experts on this subject based on the ideXlab platform.
-
Convolution Formula and finite w boson width effects in top quark width
International Journal of Modern Physics A, 2008Co-Authors: G Calderon, Lopez G CastroAbstract:In the Standard Model, the top quark decay width Γt is computed from the exclusive t → bW decay. We argue in favor of using the three body decays to compute Γt as a sum over these exclusive modes. As dictated by the S-matrix theory, these three body decays of the top quark involve only asymptotic states and incorporate the width of the W boson resonance in a natural way. The Convolution Formula commonly used to include the finite width effects is found to be valid, in the general case, when the intermediate resonance couples to a conserved current (limit of massless fermions in the case of W bosons). The relation Γt = Γ(t → bW) is recovered by taking the limit of massless fermions followed by the W boson narrow width approximation. Although both calculations of Γt are different at the formal level, their results would differ only by tiny effects induced by light fermion masses and higher-order radiative corrections.
-
Convolution Formula and finite w boson width effects in the top quark width
arXiv: High Energy Physics - Phenomenology, 2001Co-Authors: G Calderon, Lopez G CastroAbstract:In the standard model, the top quark decay width \Gamma_t is computed from the exclusive t -> bW decay. We argue in favor of using the three body decays t-> bf_i\bar{f}_j to compute \Gamma_t as a sum over these exclusive modes. As dictated by the S-matrix theory, these three body decays of the top quark involve only asymptotic states and incorporate the width of the W boson resonance in a natural way. The Convolution Formula (CF) commonly used to include the finite width effects is found to be valid, in the general case, when the intermediate resonance couples to a conserved current (limit of massless fermions in the case of W bosons). The relation Gamma_t=\Gamma(t-> bW) is recovered by taking the limit of massless fermions followed by the W boson narrow width approximation. Although both calculations of \Gamma_t are different at the formal level, their results would differ only by tiny effects induced by light fermion masses and higher order radiative corrections.