Heidelberg 2007 – scientific programme

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T: Fachverband Teilchenphysik

T 307: Elektroschwache WW Theorie

T 307.5: Talk

Wednesday, March 7, 2007, 18:05–18:25, KIP SR 2.402

W-pair production near threshold in unstable particle effective theory — Martin Beneke¹, •Pietro Falgari¹, Christian Schwinn¹, Adrian Signer², and Giulia Zanderighi³ — ¹Institut für Theoretische Physik E, RWTH Aachen, 52056 Aachen — ²IPPP, Department of Physics, University of Durham, Durham DH1 3LE, England — ³CERN, 1211 Geneva 23, Switzerland

The process of W-pair production close to threshold at an electron-positron collider is crucial for a precise determination of the W mass. Accurate theoretical predictions for this process require a systematic treatment of Γ_W/M_W∼ α_EW effects. We present an effective-theory approach based on a consistent expansion in the coupling constants, Γ_W/M_W and the non-relativistic velocity v of the W. As our main result we give a prediction for the process e⁺ e⁻ → u d µ⁻ ν_µ near the W-pair production threshold to next-to-leading order in Γ_W/M_W∼ α_EW∼ v².