Experimental overview on $D_{(s)}$ purely leptonic decays

Ma, Hailong

doi:10.22323/1.291.0021

Cited by 1 publication

(1 citation statement)

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“…The significance of this test of the Standard Model is presently limited by the experimental errors on the corresponding leptonic decay widths [67]. Recently the BES-III Experiment published its first measurements of B(D + s → µ + ν µ ) and B(D + s → τ + ν τ ) [138], and presented a preliminary measurement of B(D + → τ + ν τ ) [139]; these results are statistics-limited, and will improve with additional running. The forthcoming Belle II Experiment will also measure the leptonic D + (s) -meson decay rates, and anticipates obtaining sufficient precision to determine the CKM element |V cd | with an error below about 2% [140].…”

Section: Discussionmentioning

confidence: 99%

B - and D -meson leptonic decay constants from four-flavor lattice QCD

2018

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We describe a recent lattice-QCD calculation of the leptonic decay constants of heavy-light pseudoscalar mesons containing charm and bottom quarks and of the masses of the up, down, strange, charm, and bottom quarks. Results for these quantities are of the highest precision to date. Calculations use 24 isospin-symmetric ensembles of gauge-field configurations with six different lattice spacings as small as approximately 0.03 fm and several values of the light quark masses down to physical values of the average up-and down-sea-quark masses. We use the highly-improved staggered quark (HISQ) formulation for valence and sea quarks, including the bottom quark. The analysis employs heavy-quark effective theory (HQET). A novel HQET method is used in the determination of the quark masses.

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Section: Discussionmentioning

confidence: 99%