Non-factorizable corrections to W-pair production

Beenakker, W.; Chapovsky, A.P.; Berends, F.A.

doi:10.1016/s0370-2693(97)01010-1

Cited by 60 publications

(144 citation statements)

References 13 publications

(18 reference statements)

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“…In view of the pole structure of the virtual corrections, governed by the infinitesimal imaginary parts io, many of the non-factorizable corrections will vanish when virtual and real-gluon corrections are added up. For instance, all initial-final state interferences will vanish, leaving behind a very limited subset of 'final-state' interferences [10,16]. The following holds for the remaining interferences:…”

Section: Colour Dependence Of the Non-factorizable Correctionsmentioning

confidence: 99%

One-loop QCD interconnection effects in pair production of top quarks

1999

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We calculate the one-loop non-factorizable QCD corrections to the production and decay of pairs of top quarks at various collider experiments. These non-factorizable corrections interconnect the different production and decay stages of the off-shell top-pair production processes. This in particular affects the invariant-mass distributions of the off-shell top quarks, resulting in a shift of the maximum of the distorted Breit-Wigner distributions. Although the nonfactorizable corrections can be large, the actual shift in the mass as determined from the peak position of the corrected Breit-Wigner line-shape is below 100 MeV.

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Section: Colour Dependence Of the Non-factorizable Correctionsmentioning

confidence: 99%

One-loop QCD interconnection effects in pair production of top quarks

1999

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“…It is the aim of this paper to perform a detailed comparison of the screened-Coulomb ansatz with the results of the recent calculations [9,10,11]. It appears that this simple prescription provides one with a surprisingly reasonable quantitative understanding of the screening of the non-factorizable terms at higher energies.…”

Section: Introductionmentioning

confidence: 98%

“…In particular, recently a complete calculation of the non-factorizable corrections to the process (1) has been independently performed by two groups [9,10,11] (see also [4]). The results are in a very good agreement with each other.…”

Section: Introductionmentioning

confidence: 99%

Screened-Coulomb ansatz for the nonfactorizable radiative corrections to off-shell $W^+W^-$ production

Chapovsky¹,

Хозе²

1999

Eur. Phys. J. C

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We demonstrate that the results of the complete first order calculation of the non-factorizable QED corrections to the single-inclusive cross-sections for e + e − → W + W − → 4 fermions could be very well reproduced by a simple physically motivated ansatz. The latter allows to take into account effectively the screening role of the non-Coulomb radiative mechanisms by introducing a dampening factor in front of the width-dependent part of the known first-order Coulomb correction, the so-called screened-Coulomb ansatz.

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“…(α denotes the electromagnetic coupling, and s 2 w ≡ sin 2 θ w with θ w the Weinberg angle.) NLO calculations of four-fermion production have been done already some time ago in the continuum (not near threshold) in the double-pole approximation for the two W propagators [4][5][6] or with further simplifications [7,8]. This approximation was supposed to break down for kinematic reasons in the threshold region.…”

Section: Introductionmentioning

confidence: 99%

Four-fermion production near the W pair-production threshold

et al. 2008

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We perform a dedicated study of the four-fermion production process e − e + → µ −ν µ ud X near the W pair-production threshold in view of the importance of this process for a precise measurement of the W boson mass. Accurate theoretical predictions for this process require a systematic treatment of finite-width effects. We use unstable-particle effective field theory (EFT) to perform an expansion in the coupling constants, Γ W /M W , and the non-relativistic velocity v of the W boson up to next-to-leading order in Γ W /M W ∼ α ew ∼ v 2 . We find that the dominant theoretical uncertainty in M W is currently due to an incomplete treatment of initial-state radiation. The remaining uncertainty of the NLO EFT calculation translates into δM W ≈ 10 -15 MeV, and to about 5 MeV with additional input from the NLO four-fermion calculation in the full theory.

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Non-factorizable corrections to W-pair production

Cited by 60 publications

References 13 publications

One-loop QCD interconnection effects in pair production of top quarks

One-loop QCD interconnection effects in pair production of top quarks

Screened-Coulomb ansatz for the nonfactorizable radiative corrections to off-shell $W^+W^-$ production

Four-fermion production near the W pair-production threshold

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