Journal Article

FZJ-2015-05042

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png D s → η , η ′ semileptonic decay form factors with disconnected quark loop contributions

Bali, G. S. ; Collins, S. ; Dürr, S.FZJ* ; Kanamori, I. (Corresponding author)

2015
Soc. [S.l.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/11127  doi:10.1103/PhysRevD.91.014503

Abstract: We 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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Contributing Institute(s):

1. Jülich Supercomputing Center (JSC)

Research Program(s):

1. 511 - Computational Science and Mathematical Methods (POF3-511) (POF3-511)

Appears in the scientific report 2015

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Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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