|V_cd| from D Meson Leptonic Decays

Abstract

We present an update of the D meson decay constant f_D using the Highly Improved Staggered Quark (HISQ) action for valence charm and light quarks on MILC N_f = 2+1 lattices. The new determination incorporates HPQCD's improved scale r_1^{N_f = 2+1} = 0.3133(23) fm, accurately retuned bare charm quark masses and data from an ensemble that is more chiral than in our previous calculations. We find f_D = 208.3(3.4) MeV. Combining the new f_D with D -> μν branching fraction data from CLEO-c, we extract the CKM matrix element |V_cd| = 0.223(10)_{exp.}(4)_{lat.}. This value is in excellent agreement with |V_cd| from D semileptonic decays and from neutrino scattering experiments and has comparable total errors. We determine the ratio between semileptonic form factor and decay constant and find [f^{D -> π}_+(0) / f_D ]_{lat.} = 3.20(15) GeV^{-1} to be compared with the experimental value of [f^{D -> π}_+(0) / f_D ]_{exp.} = 3.19(18) GeV^{-1}. Finally, we mention recent preliminary but already more accurate D -> μν branching fraction measurements from BES III and discuss their impact on precision |V_cd| determinations in the future.

8 pages, 8 figures, and 5 tables

References in corpus (9)

• Highly Improved Staggered Quarks on the Lattice, with Applications to Charm Physics
• High Precision determination of the pi, K, D and D_s decay constants from lattice QCD
• Update: Precision D_s decay constant from full lattice QCD using very fine lattices
• Accumulating evidence for nonstandard leptonic decays of D_s mesons
• $D\to K,l\nu$ Semileptonic Decay Scalar Form Factor and $|V_{cs}|$ from Lattice QCD
• Update: Accurate Determinations of alpha_s from Realistic Lattice QCD
• Precise B, B_s and B_c meson spectroscopy from full lattice QCD
• Measurement of B(Ds -> munu)
• Measurement of the Absolute Branching Fractions for $D_s^{-}\to {\ell }^{-}{\bar{\nu }}_{\ell }$ and Extraction of the Decay Constant $f_{D_s}$

Cited by in corpus (37)

• FLAG Review 2019
• FLAG Review 2021
• QCD and strongly coupled gauge theories: challenges and perspectives
• Lattice QCD ensembles with four flavors of highly improved staggered quarks
• $B$- and $D$-meson leptonic decay constants from four-flavor lattice QCD
• $|V_{ub}|$ from $B\to \pi \ell \nu$ decays and (2+1)-flavor lattice QCD
• Precision tests of the J/ψ from full lattice QCD: mass, leptonic width and radiative decay rate to η_c
• Charmed and light pseudoscalar meson decay constants from four-flavor lattice QCD with physical light quarks
• Leptonic decay constants fK, fD and fDs with Nf = 2+1+1 twisted-mass lattice QCD
• Prospects of discovering new physics in rare charm decays
• Cornering Scalar Leptoquarks at LHC
• FLAG Review 2024
• On chiral extrapolations of charmed meson masses and coupled-channel reaction dynamics
• Challenges in Semileptonic B Decays
• The decay constants ${\mathbf{f}}_{\mathbf{D}}$ and ${\mathbf{f}}_{{\mathbf{D}}_{\mathbf{s}}}$ in the continuum limit of ${\mathbf{N}}_{\mathbf{f}}=2+1$ domain wall lattice QCD
• Heavy-Light Mesons on the Light Front
• Determination of the pseudoscalar decay constant $f_{D_s^{+}}$ via $D_s^{+}\to {\mu }^{+}{\nu }_{\mu }$
• Measurement of the $D_s^{+}\to {\ell }^{+}{\nu }_{\ell }$ branching fractions and the decay constant $f_{D_s^{+}}$
• D-meson semileptonic decays to pseudoscalars from four-flavor lattice QCD
• Charmed and $\varphi$ meson decay constants from 2+1-flavor lattice QCD
• Charming Dark Matter
• SU(3)-breaking ratios for $D_{(s)}$ and $B_{(s)}$ mesons
• In-medium properties of pseudoscalar $D_s$ and $B_s$ mesons
• Coupled-channel dynamics with chiral long-range forces in the open-charm sector of QCD
• Leptonic D_s decays in two-flavour lattice QCD
• Updated measurement of the branching fraction of $D_s^{+}\to {\tau }^{+}{\nu }_{\tau }$ via ${\tau }^{+}\to {\pi }^{+}{\bar{\nu }}_{\tau }$
• Improved measurement of the branching fraction of $D_s^{+}\to {\mu }^{+}{\nu }_{\mu }$
• Charm semileptonic decays and |V_{cs(d)}| from heavy clover quarks and 2+1 flavor asqtad staggered ensembles
• Charmed and light pseudoscalar meson decay constants from HISQ simulations
• Quark flavor physics and lattice QCD
• Pseudoscalar meson physics with four dynamical quarks
• Radiative Decays of Heavy-light Mesons and the $f_{H,H^{\ast },H_1}^{(T)}$ Decay Constants
• Lattice results for $D/D_s$ leptonic and semileptonic decays
• Recent Progress in Lattice QCD
• On chiral extrapolations of coupled-channel reaction dynamics for charmed mesons
• Lattice inputs for the determination of $|V_{cd}|$ and $|V_{cs}|$ from (semi-)leptonic decays
• Leptonic $D_s$ decays at $B$-factories