$$D$$-Meson Semileptonic Form Factors at Zero Momentum Transfer in (2+1+1)-Flavor Lattice QCD
- Arizona U.
- Washington U., St. Louis
- U. Utah, Salt Lake City
- Illinois U., Urbana
- Granada U., Theor. Phys. Astrophys.
- Fermilab
We present a calculation of the $$D\to K \ell \nu$$ and $$D\to\pi \ell \nu$$ semileptonic form factors at $q^2=0$, which enable determinations of the CKM matrix elements $$\lvert{V_{cs}}\rvert$$ and $$\lvert{V_{cd}}\rvert$$, respectively. We use gauge-field configurations generated by the MILC collaboration with four flavors of highly-improved staggered (HISQ) quarks, analyzing several ensembles including those with physical pion masses and approximate lattice spacings ranging from 0.12~fm to 0.042~fm. We also use the HISQ action for the valence quarks. We employ twisted boundary conditions to calculate the form factors at zero momentum transfer directly. We use heavy-light-meson chiral perturbation theory modified for energetic pions and kaons, and supplemented by terms to describe the lattice-spacing dependence, to obtain preliminary results at the physical point and in the continuum limit.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- LATTICE-FERMILAB; LATTICE-MILC
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1250504
- Report Number(s):
- FERMILAB-CONF-15-483-CD-PPD; arXiv:1511.04000; 1404168
- Country of Publication:
- United States
- Language:
- English
Similar Records
$B$-Meson Semileptonic Form Factors on (2+1+1)-Flavor HISQ Ensembles
Kaon and D Meson Semileptonic Form Factors from Lattice QCD