Charm semileptonic decays and |V_{cs(d)}| from heavy clover quarks and 2+1 flavor asqtad staggered ensembles

Abstract

By combining experimentally measured partial branching fractions for the semileptonic decays D to K l nu and D to pi l nu with lattice calculations of the form factors f_+^{D to K}(q^2) and f_+^{D to pi}(q^2), one can extract the CKM matrix elements |V_{cs}| and |V_{cd}|. We are calculating the form factors by using Fermilab charm and asqtad staggered light and strange quarks on 2+1 flavor asqtad staggered ensembles generated by the MILC Collaboration. We vary the light valence quark masses from 0.4m_s to 0.05m_s (m_s is the strange sea-quark mass), and the lattice spacings, from about 0.12 fm to about 0.045 fm. We extrapolate to the physical light-quark mass and the continuum limit using heavy-light meson staggered chiral perturbation theory about the SU(2) and SU(3) limits, compare the resulting (preliminary) form factor shapes with experiment, and discuss our errors.

arXiv comment7 pages, 6 figures, presented at The XXXth International Symposium on Lattice Field Theory - Lattice 2012, June 24-29, 2012 Cairns, Australia, to appear as PoS(Lattice 2012)272

References in corpus (13)

• B- and D-meson decay constants from three-flavor lattice QCD
• Improved measurements of D meson semileptonic decays to pi and K mesons
• The B -> pi l nu semileptonic form factor from three-flavor lattice QCD: A model-independent determination of |V(ub)|
• $D\to K,l\nu$ Semileptonic Decay Scalar Form Factor and $|V_{cs}|$ from Lattice QCD
• Calculation of the heavy-hadron axial couplings g_1, g_2, and g_3 using lattice QCD
• $D\to \pi ,l\nu$ Semileptonic Decays, $|V_{cd}|$ and 2${}^{nd}$ Row Unitarity from Lattice QCD
• Measurement of the q2 dependence of the Hadronic Form Factor in D0 --> K- e+ nu_e decays
• Measurement of the Hadronic Form Factor in D0 --> K- e+ nue Decays
• |V_cd| from D Meson Leptonic Decays
• Heavy-Light Semileptonic Decays in Staggered Chiral Perturbation Theory
• Kaon mixing matrix elements from beyond-the-Standard-Model operators in staggered chiral perturbation theory
• Form factors for B and B_s semileptonic decays with NRQCD/HISQ quarks
• Progress on charm semileptonic form factors from 2+1 flavor lattice QCD

Cited by in corpus (3)

• $|V_{cd}|$ and $|V_{cs}|$ from Semileptonic and Leptonic decays using lattice QCD methods
• Lattice results for $D/D_s$ leptonic and semileptonic decays
• Lattice inputs for the determination of $|V_{cd}|$ and $|V_{cs}|$ from (semi-)leptonic decays