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Semileptonic Decays of $D \to \rho l^+ \nu$ and $D_{(s)} \to K^\ast l^+ \nu$ from Light-Cone Sum Rules

We investigate the semileptonic decays of charmed mesons to light vector mesons within the framework of light-cone sum rules. Our calculation is performed at leading order in QCD coupling, incorporating contributions up to twist-five…

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Semileptonic decay of a heavy-light pseudoscalar to a light vector meson

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D_s spectrum and leptonic decays with Fermilab heavy quarks and improved staggered light quarks

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Leptonic decay-constant ratio $f_K/f_\pi$ from clover-improved $N_f=2+1$ QCD

The leptonic decay-constant ratio $f_K/f_\pi$ is calculated from lattice-QCD simulations using $N_f=2+1$ dynamical fermion flavors in the clover-improved formulation and 2-HEX smearing. The simulations were performed for a range of…

High Energy Physics - Lattice · Physics 2016-11-15 Enno E. Scholz , Stephan Durr

D -> \pi l \nu and D -> K l \nu form factors with Nf=2+1+1 Twisted fermions

We present a lattice QCD determination of the vector and scalar form factors of the semileptonic decays D->\pi l \nu and D -> K l \nu which are relevant for the extraction of the CKM matrix elements |Vcd| and |Vcs| from experimental data.…

High Energy Physics - Lattice · Physics 2015-11-17 N. Carrasco , P. Lami , V. Lubicz , E. Picca , L. Riggio , S. Simula , C. Tarantino

Phenomenology with Lattice NRQCD b Quarks

The HPQCD collaboration has used radiatively-improved NonRelativistic QCD (NRQCD) for $b$ quarks in bottomonium to determine the decay rate of $\Upsilon$ and $\Upsilon^\prime$ mesons to leptons in lattice QCD. Using time-moments of vector…

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Masses and decay constants of D(s)* and B(s)* mesons with Nf = 2 + 1 + 1 twisted mass fermions

We present a lattice calculation of the masses and decay constants of $D_{(s)}^*$ and $B_{(s)}^*$ mesons using the gauge configurations produced by the European Twisted Mass Collaboration (ETMC) with $N_f = 2 + 1 + 1$ dynamical quarks at…

High Energy Physics - Lattice · Physics 2017-09-13 V. Lubicz , A. Melis , S. Simula

Decay constants of heavy mesons from QCD sum rules

We present a sum-rule extraction of the decay constants of the D, Ds, B, and Bs mesons from the two-point correlator of heavy-light pseudoscalar currents [1]. Our main emphasis is laid on the control over the uncertainties in the decay…

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Semileptonic $B \to D^{(\ast)} \ell\nu$ Decay Form Factors using the Oktay-Kronfeld Action

We report recent progress in calculating semileptonic form factors for the $\bar{B} \to D^\ast \ell \bar{\nu}$ and $\bar{B} \to D \ell \bar{\nu}$ decays using the Oktay-Kronfeld (OK) action for bottom and charm quarks. We use the second…

High Energy Physics - Lattice · Physics 2024-12-11 Tanmoy Bhattacharya , Benjamin J. Choi , Rajan Gupta , Yong-Chull Jang , Seungyeob Jwa , Sunkyu Lee , Weonjong Lee , Jaehoon Leem , Sungwoo Park

Precision measurements of $B(D^+ \rightarrow \mu^+ \nu_{\mu})$, the pseudoscalar decay constant $f_{D^+}$, and the quark mixing matrix element $|V_{\rm cd}|$

We report a measurement of the branching fraction $B(D^+ \rightarrow \mu^+ \nu_{\mu}) = [3.71 \pm 0.19 (\rm stat) \pm 0.06 (\rm sys)]\times 10^{-4}$ based on 2.92 ${\rm fb^{-1}}$ of data accumulated at $\sqrt{s}=3.773$ GeV with the BESIII…

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Heavy Flavours Leptonic and Semi-leptonic Decays on the Lattice

We present some results of the {\bf{ELC}} (European Lattice Collaboration) study of leptonic and semi-leptonic decays of heavy-light mesons. Results on the decay constants $f_D, f_{D_s}$ and $f_B, f_{B_s}$, the semi-leptonic form factors of…

High Energy Physics - Phenomenology · Physics 2007-05-23 As. Abada