D-meson semileptonic decays to pseudoscalars from four-flavor lattice QCD
Metadatos
Afficher la notice complèteEditorial
American Physical Society
Date
2023-05-31Referencia bibliográfica
Bazavov, A. et al. D-meson semileptonic decays to pseudoscalars from four-flavor lattice QCD. Phys. Rev. D 107, 094516. [DOI: 10.1103/PhysRevD.107.094516]
Patrocinador
Fermi Research Alliance, LLC DE-AC02-07CH11359; National Science Foundation ACI-1548562, OAC-1818253, PHY17-19626, PHY20-13064 NSF; Office of Science DE-AC02-06CH11357, DE-AC05-00OR22725, DE-SC0010005, DE-SC0010120, DE-SC0011090, DE-SC0015655, DE-SC0021006 SC; Lawrence Berkeley National Laboratory DE-AC02-05CH11231 LBNL; Society for Research on Adolescence PID2019–106087GB-C21 SRA; European Regional Development Fund P18-FR-4314, RYC2020-030244-I / AEI / 10.13039/501100011033 ERDF; Junta de Andalucía A-FQM-467-UGR18, FQM-101Résumé
We present lattice-QCD calculations of the hadronic form factors for the semileptonic decays D→πℓν, D→Kℓν, and Ds→Kℓν. Our calculation uses the highly improved staggered quark (HISQ) action for all valence and sea quarks and includes Nf=2+1+1 MILC ensembles with lattice spacings ranging from a≈0.12 fm down to 0.042 fm. At most lattice spacings, an ensemble with physical-mass light quarks is included. The HISQ action allows all the quarks to be treated with the same relativistic light-quark action, allowing for nonperturbative renormalization using partial conservation of the vector current. We combine our results with experimental measurements of the differential decay rates to determine |Vcd|D→π=0.2238(11)Expt(15)QCD(04)EW(02)SIB[22]QED and |Vcs|D→K=0.9589(23)Expt(40)QCD(15)EW(05)SIB[95]QED. This result for |Vcd| is the most precise to date, with a lattice-QCD error that is, for the first time for the semileptonic extraction, at the same level as the experimental error. Using recent measurements from BES III, we also give the first-ever determination of |Vcd|Ds→K=0.258(15)Expt(01)QCD[03]QED from Ds→Klν. Our results also furnish new Standard Model calculations of the lepton flavor universality ratios Rμ/eD→π=0.98671(17)QCD[500]QED, Rμ/eD→K=0.97606(16)QCD[500]QED, and Rμ/eDs→K=0.98099(10)QCD[500]QED, which are consistent within 2σ with experimental measurements. Our extractions of |Vcd| and |Vcs|, when combined with a value for |Vcb|, provide the most precise test of second-row Cabibbo-Kobayashi-Maskawa unitarity, finding agreement with unitarity at the level of one standard deviation.