標題: | D-s -> eta,eta ' semileptonic decay form factors with disconnected quark loop contributions |
作者: | Bali, Gunnar S. Collins, Sara Duerr, Stephan Kanamori, Issaku 物理研究所 Institute of Physics |
公開日期: | 14-一月-2015 |
摘要: | 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. |
URI: | http://dx.doi.org/10.1103/PhysRevD.91.014503 http://hdl.handle.net/11536/124209 |
ISSN: | 1550-7998 |
DOI: | 10.1103/PhysRevD.91.014503 |
期刊: | PHYSICAL REVIEW D |
Volume: | 91 |
Issue: | 1 |
起始頁: | 0 |
結束頁: | 0 |
顯示於類別: | 期刊論文 |