ar X iv : h ep - l at / 0 61 00 25 v 1 3 O ct 2 00 6 The First Moment of the Kaon Distribution Amplitude from N f = 2 + 1 Domain Wall Fermions
نویسندگان
چکیده
We present a lattice computation of the first moment of the kaon's leading-twist distribution amplitude. We use ensembles with 2+1 dynamical flavours of domain wall fermions and the Iwasaki gauge action from the RBC and UKQCD joint dataset. We observe the expected chiral behaviour and obtain ξ (2 GeV) ≡ 3/5 a 1 K (2 GeV) = 0.032(3), which agrees very well with other results obtained using QCD sum-rules and the recent lattice result from the UKQCD/QCDSF collaboration .
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We present results for the couplings of light vector mesons to vector and tensor currents and on the low moments of the light-cone distribution amplitudes of the pion and kaon. The calculations are performed on the RBC and UKQCD collaborations’ ensembles generated with the Iwasaki gauge action and with 2+1 flavours of domain wall fermions. The (preliminary) results for the ratios of the couplin...
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تاریخ انتشار 2006