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We provide a 0.8\%-accurate determination of $V_{cs}$ from combining experimental results for the differential rate of $D \rightarrow K$ semileptonic decays with precise form factors that we determine from lattice QCD. This is the first…

High Energy Physics - Lattice · Physics 2021-09-01 Bipasha Chakraborty , W. G. Parrott , C. Bouchard , C. T. H. Davies , J. Koponen , G. P. Lepage

We present a lattice-QCD calculation of the $B\to\pi\ell\nu$ semileptonic form factors and a new determination of the CKM matrix element $|V_{ub}|$. We use the MILC asqtad 2+1-flavor lattice configurations at four lattice spacings and…

We perform a global fit to the CKM unitarity triangle using the latest experimental and theoretical constraints. Our emphasis is on the hadronic weak matrix elements that enter the analysis, which must be computed using lattice QCD or other…

High Energy Physics - Phenomenology · Physics 2010-04-06 Jack Laiho , Ruth S. Van de Water , Enrico Lunghi

We present a new calculation of the CP violation parameter $\epsilon^{\prime}/ \epsilon$. The results reported in this paper have been obtained by using the $\Delta S=1$ effective Hamiltonian computed at the next-to-leading order, including…

High Energy Physics - Phenomenology · Physics 2010-11-01 M. Ciuchini , E. Franco , G. Martinelli , L. Reina

After a brief introduction to lattice QCD, I summarize the results for the light quark masses and the bag parameters $B_K$, $B_6^{1/2}$, and $B_8^{3/2}$. The implications of these results for the standard model estimates of CP violation…

High Energy Physics - Phenomenology · Physics 2007-05-23 Rajan Gupta

We address the nonperturbative calculation of the inclusive decay rate of semileptonic $B_{(s)}$-meson decays from lattice QCD. Precise Standard-Model predictions are key ingredients in searches for new physics, and this type of computation…

High Energy Physics - Lattice · Physics 2023-07-26 Alessandro Barone , Shoji Hashimoto , Andreas Jüttner , Takashi Kaneko , Ryan Kellermann

Lattice QCD calculations in charm and bottom physics are particularly important because they can provide the hadronic weak decay matrix elements needed for key constraints on the CKM Unitarity Triangle. I will summarise recent results in…

High Energy Physics - Lattice · Physics 2012-03-20 Christine Davies

Precision measurements of nucleons provide constraints on the Standard Model and can discern the signatures predicted for particles beyond the Standard Model (BSM). Knowing the Standard Model inputs to nucleon matrix elements will be…

High Energy Physics - Lattice · Physics 2015-05-30 Huey-Wen Lin

We present the calculation of the short-distance power corrections to the CP-violation parameter $\varepsilon_K$ coming from dimension-8 operators in the $\Delta S=2$ effective Hamiltonian. A first estimate of this contribution, obtained…

High Energy Physics - Phenomenology · Physics 2022-03-09 M. Ciuchini , E. Franco , V. Lubicz , G. Martinelli , L. Silvestrini , C. Tarantino

Lattice QCD calculations of hadronic matrix elements allow one to draw inferences about quark flavor interactions from measurements of hadron decays. Within the context of the Standard Model, the magnitude of the charm-bottom quark coupling…

High Energy Physics - Lattice · Physics 2017-04-04 Matthew Wingate

We provide hadronic input for the $B$-meson semileptonic transitions to a light pseudoscalar meson at large recoil. The $B_s\to K$ form factor calculated from QCD light-cone sum rule is updated, to be used for a $|V_{ub}|$ determination…

High Energy Physics - Phenomenology · Physics 2017-09-13 Alexander Khodjamirian , Aleksey V. Rusov

In this write-up we review and update our recent lattice QCD calculation of $B \to K^*$, $B_s \to \phi$, and $B_s \to K^*$ form factors [arXiv:1310.3722]. These unquenched calculations, performed in the low-recoil kinematic regime, provide…

High Energy Physics - Lattice · Physics 2015-04-07 R. R. Horgan , Z. Liu , S. Meinel , M. Wingate

The parameter epsilon_K, that quantifies CP violation in kaon mixing, is the observable setting the strongest constraints on new physics with a generic flavour and CP structure. While its experimental uncertainty is at the half percent…

High Energy Physics - Phenomenology · Physics 2016-06-03 Filippo Sala

We report the results of a calculation of the K --> pi pi matrix elements relevant for the $\DIhalf$ rule and $\epe$ in quenched lattice QCD using domain wall fermions at a fixed lattice spacing $a^{-1} \sim 2$ GeV. Working in the…

High Energy Physics - Lattice · Physics 2008-11-26 T. Blum , P. Chen , N. Christ , C. Cristian , C. Dawson , G. Fleming , R. Mawhinney , S. Ohta , G. Siegert , A. Soni , P. Vranas , M. Wingate , L. Wu , Y. Zhestkov , RBC Collaboration

A brief review of lattice calculations of the bag parameter B_K relevant for understanding indirect CP violation in the neutral kaon sector is given. A status report on current state-of-the-art calculations is presented as well as a…

High Energy Physics - Lattice · Physics 2007-05-23 Rajan Gupta

Semileptonic $B_s \to K \ell \nu$ decays provide an alternative $b$-decay channel to determine the CKM matrix element $|V_{ub}|$, and to obtain a $R$-ratio to investigate lepton-flavor-universality violations. Results for the CKM matrix…

High Energy Physics - Lattice · Physics 2023-06-21 Jonathan M. Flynn , Ryan C. Hill , Andreas Jüttner , Amarjit Soni , J. Tobias Tsang , Oliver Witzel

We present an exploratory calculation of the standard model Delta S=2 matrix element relevant for indirect CP violation in K -> pi pi decays. The computation is performed with overlap fermions in the quenched approximation at beta=6.0 on a…

High Energy Physics - Lattice · Physics 2015-06-25 N. Garron , L. Giusti , C. Hoelbling , L. Lellouch , C. Rebbi

Significant progress has recently been achieved in the lattice gauge theory calculations required for extracting the fundamental parameters of the standard model from experiment. Recent lattice determinations of such quantities as the kaon…

High Energy Physics - Phenomenology · Physics 2015-06-25 Paul B. Mackenzie

A recent Letter~\cite{Borsanyi:2025dyp} employs lattice QCD calculations of the equation of state, combined with entropy-density contour analysis, to place a lower bound of $\mu_B \gtrsim 450$~MeV on the location of the QCD critical…

High Energy Physics - Lattice · Physics 2026-04-01 Roy A. Lacey

We use lattice QCD to fully determine the CKM matrix. |V_{cd}|, |V_{cs}|, |V_{ub}|, |V_{cb}| and |V_{us}| are, respectively, directly determined with recent lattice results for form factors of semileptonic D->pi l nu, D->K l nu, B->pi l nu,…

High Energy Physics - Phenomenology · Physics 2007-05-23 Masataka Okamoto