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Disconnected contributions to D-meson semi-leptonic decay form factors

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arxiv 1111.4053 v1 pith:3YI7SN63 submitted 2011-11-17 hep-lat hep-ph

G. S. Bali , S. Collins , R. Horsley , I. Kanamori , Y. Nakamura , D. Pleiter , P. Pérez-Rubio , P. E. L. Rakow
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A. Schäfer G. Schierholz F. Winter J. M. Zanotti (QCDSF Collaboration)
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classification hep-lathep-ph
keywords disconnectedd-mesondecayflavorformaccelerationapproximationcalculate
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We calculate the disconnected contribution to the form factor for the semileptonic decay of a D-meson into a final state, containing a flavor singlet eta meson. We use QCDSF n_f=2+1 configurations at the flavor symmetric point m_u=m_d=m_s and the partially quenched approximation for the relativistic charm quark. Several acceleration and noise reduction techniques for the stochastic estimation of the disconnected loop are tested.

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