Multi-leg calculations with the GRACE/1-LOOP system. --Toward Radiative Corrections to e+e- -> mu nu-bar u d-bar --

(2) KEK; (3) Kogakuin Univ.); F. Boudjema (1); J. Fujimoto (2); K.Kato (3); T. Ishikawa (2); T. Kaneko (2); Y. Kurihara (2); Y. Shimizu (2) ((1) LAPTH

arxiv: hep-ph/0407079 · v1 · submitted 2004-07-07 · ✦ hep-ph

Multi-leg calculations with the GRACE/1-LOOP system. --Toward Radiative Corrections to e+e- -> mu nu-bar u d-bar --

F. Boudjema (1) , J. Fujimoto (2) , T. Ishikawa (2) , T. Kaneko (2) , K.Kato (3) , Y. Kurihara (2) , Y. Shimizu (2) ((1) LAPTH , (2) KEK

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(3) Kogakuin Univ.)

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classification ✦ hep-ph

keywords correctionsd-barfunctionsgraceloopnu-barperformedreduction

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We performed the calculation of the full O(alpha) corrections to e+e- -> mu- nu-bar u d-bar with the help of the GRACE/1-LOOP system. We discuss how a finite decay width introduces a serious gauge invariance breaking, particularly for infrared 5-point functions. This is related to the way the reduction of those functions is performed and to the treatment of the width in the reduction.

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Multi-leg calculations with the GRACE/1-LOOP system. --Toward Radiative Corrections to e+e- -> mu nu-bar u d-bar --

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