出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：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 nf = 2+1 configurations at the flavor symmetric point mu = md = ms 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.
