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• W3136385113 abstract "We present the first lattice-QCD determination of the form factors describing the semileptonic decays $Lambda_b to Lambda_c^*(2595)ell^-bar{nu}$ and $Lambda_b to Lambda_c^*(2625)ell^-bar{nu}$, where the $Lambda_c^*(2595)$ and $Lambda_c^*(2625)$ are the lightest charm baryons with $J^P=frac12^-$ and $J^P=frac32^-$, respectively. These decay modes provide new opportunities to test lepton flavor universality and also play an important role in global analyses of the strong interactions in $bto c$ semileptonic decays. We determine the full set of vector, axial vector, and tensor form factors for both decays, but only in a small kinematic region near the zero-recoil point. The lattice calculation uses three different ensembles of gauge-field configurations with $2+1$ flavors of domain-wall fermions, and we perform extrapolations of the form factors to the continuum limit and physical pion mass. We present Standard-Model predictions for the differential decay rates and angular observables. In the kinematic region considered, the differential decay rate for the $frac12^-$ final state is found to be approximately 2.5 times larger than the rate for the $frac32^-$ final state. We also test the compatibility of our form-factor results with zero-recoil sum rules." @default.
• W3136385113 created "2021-03-29" @default.
• W3136385113 creator A5011693578 @default.
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• W3136385113 date "2021-05-24" @default.
• W3136385113 modified "2023-10-13" @default.
• W3136385113 title "<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mi mathvariant=normal>Λ</mml:mi><mml:mi>b</mml:mi></mml:msub><mml:mo stretchy=false>→</mml:mo><mml:msubsup><mml:mi mathvariant=normal>Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>*</mml:mo></mml:msubsup><mml:mo stretchy=false>(</mml:mo><mml:mn>2595</mml:mn><mml:mo>,</mml:mo><mml:mn>2625</mml:mn><mml:mo stretchy=false>)</mml:mo><mml:msup><mml:mo>ℓ</mml:mo><mml:mo>−</mml:mo></mml:msup><mml:mover accent=true…" @default.
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• W3136385113 doi "https://doi.org/10.1103/physrevd.103.094516" @default.
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