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Title: $D$-Meson Semileptonic Form Factors at Zero Momentum Transfer in (2+1+1)-Flavor Lattice QCD

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [2] ;  [6] ;  [6] ;  [1] ;  [6]
  1. Arizona U.
  2. Washington U., St. Louis
  3. U. Utah, Salt Lake City
  4. Illinois U., Urbana
  5. Granada U., Theor. Phys. Astrophys.
  6. Fermilab
Publication Date:
OSTI Identifier:
1250504
Report Number(s):
FERMILAB-CONF-15-483-CD-PPD; arXiv:1511.04000
1404168
DOE Contract Number:
AC02-07CH11359
Resource Type:
Conference
Research Org:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
LATTICE-FERMILAB; LATTICE-MILC
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS