Second moment of the pion's distribution amplitude

A. Sch\"afer; D. Pleiter; G. Schierholz; J.M. Zanotti; M. G\"ockeler; P.E.L. Rakow; R. Horsley; W. Schroers

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Second moment of the pion's distribution amplitude

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arxiv hep-lat/0510089 v1 pith:4YDHSZCX submitted 2005-10-19 hep-lat hep-ph

M. Göckeler , R. Horsley , D. Pleiter , P.E.L. Rakow , A. Schäfer , G. Schierholz , W. Schroers , J.M. Zanotti This is my paper

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We present preliminary results from the QCDSF/UKQCD collaborations for the second moment of the pion's distribution amplitude with two flavours of dynamical fermions. We use nonperturbatively determined renormalisation coefficients to convert our results to the MSbar scheme at 5 GeV^2. Employing a linear chiral extrapolation from our large pion masses >550 MeV, we find <xi^2>=0.281(28), leading to a value of a_2=0.236(82) for the second Gegenbauer moment.

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