TY - JOUR
T1 - Four-fermion production near the W pair-production threshold
AU - Beneke, M.
AU - Falgari, P.
AU - Schwinn, C.
AU - Signer, A.
AU - Zanderighi, G.
N1 - Funding Information:
This work is supported in part by the DFG Sonderforschungsbereich/Transregio 9 “Computergestützte Theoretische Teilchenphysik”, the DFG Graduiertenkolleg “Elementarteilchenphysik an der TeV-Skala”, and the European Community's Marie-Curie Research Training Network under contract MRTN-CT-2006-035505 ‘Tools and Precision Calculations for Physics Discoveries at Colliders’.
PY - 2008/3/21
Y1 - 2008/3/21
N2 - We perform a dedicated study of the four-fermion production process e- e+ → μ- over(ν, ̄)μ u over(d, ̄) 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, ΓW / MW, and the non-relativistic velocity v of the W boson up to next-to-leading order in ΓW / MW ∼ αew ∼ v2. We find that the dominant theoretical uncertainty in MW is currently due to an incomplete treatment of initial-state radiation. The remaining uncertainty of the NLO EFT calculation translates into δ MW ≈ 10 - 15 MeV, and to about 5 MeV with additional input from the NLO four-fermion calculation in the full theory.
AB - We perform a dedicated study of the four-fermion production process e- e+ → μ- over(ν, ̄)μ u over(d, ̄) 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, ΓW / MW, and the non-relativistic velocity v of the W boson up to next-to-leading order in ΓW / MW ∼ αew ∼ v2. We find that the dominant theoretical uncertainty in MW is currently due to an incomplete treatment of initial-state radiation. The remaining uncertainty of the NLO EFT calculation translates into δ MW ≈ 10 - 15 MeV, and to about 5 MeV with additional input from the NLO four-fermion calculation in the full theory.
KW - Effective Lagrangian
KW - Electroweak interaction
KW - Radiative corrections
KW - W bosons
UR - http://www.scopus.com/inward/record.url?scp=36849035766&partnerID=8YFLogxK
U2 - 10.1016/j.nuclphysb.2007.09.030
DO - 10.1016/j.nuclphysb.2007.09.030
M3 - Article
AN - SCOPUS:36849035766
SN - 0550-3213
VL - 792
SP - 89
EP - 135
JO - Nuclear Physics, Section B
JF - Nuclear Physics, Section B
IS - 1-2
ER -