Bali, Gunnar S. and Collins, Sara and Duerr, Stephan and Kanamori, Issaku (2015) D-s -> eta,eta ' semileptonic decay form factors with disconnected quark loop contributions. PHYSICAL REVIEW D, 91 (1): 014503. ISSN 2470-0010, 2470-0029
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We calculate for the first time the form factors of the semileptonic decays of the D-s meson to eta and eta ' using lattice techniques. As a by-product of the calculation we obtain the masses and leading distribution amplitudes of the eta and eta' mesons. We use N-f = 2 + 1 nonperturbatively improved clover fermions on configurations with a lattice spacing a similar to 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, vertical bar f(0)(Ds ->eta)vertical bar = 0.564(11) and vertical bar f(0)(Ds ->eta')vertical bar = 0.437(18) at M-pi approximate to 470 MeV, as well as vertical bar f(0)(Ds ->eta)vertical bar = 0.542(13) and vertical bar f(0)(Ds ->eta')vertical bar = 0.404(25) at M-pi approximate to 370 MeV, w here the errors are statistical only.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 25 Jul 2019 11:58 |
| Last Modified: | 25 Jul 2019 11:58 |
| URI: | https://pred.uni-regensburg.de/id/eprint/6105 |
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