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000202895 1001_ $$0P:(DE-HGF)0$$aBali, Gunnar S.$$b0
000202895 245__ $$aD s → η , η ′ semileptonic decay form factors with disconnected quark loop contributions
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000202895 520__ $$aWe calculate for the first time the form factors of the semileptonic decays of the Ds meson to η and η′ using lattice techniques. As a by-product of the calculation we obtain the masses and leading distribution amplitudes of the η and η′ mesons. We use Nf=2+1 nonperturbatively improved clover fermions on configurations with a lattice spacing a∼0.075  fm. We are able to obtain clear signals for relevant matrix elements, using several noise reduction techniques, for both the connected and the disconnected contributions. This includes a new method for reducing the variance of pseudoscalar disconnected two-point functions. At zero momentum transfer, we obtain for the scalar form factors, |fDs→η0|=0.564(11) and |fDs→η′0|=0.437(18) at Mπ≈470  MeV, as well as |fDs→η0|=0.542(13) and |fDs→η′0|=0.404(25) at Mπ≈370  MeV, where the errors are statistical only.
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000202895 7001_ $$0P:(DE-HGF)0$$aCollins, Sara$$b1
000202895 7001_ $$0P:(DE-Juel1)132580$$aDürr, Stephan$$b2
000202895 7001_ $$0P:(DE-HGF)0$$aKanamori, Issaku$$b3$$eCorresponding author
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