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CKM $\gamma$ measurements at LHCb

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arxiv 2401.03720 v1 pith:FFHYW4UX submitted 2024-01-08 hep-ex

classification hep-ex
keywords measurementsdecaysgammalhcbrightarrowmeasurementpresentedtree-level
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The tree-level measurement of the CKM $\gamma$ angle is a crucial test of $CP$ violation in the Standard Model (SM). Discrepancies between direct measurements (tree-level decays) and indirect measurements (loop decays) could indicate physics beyond the SM. Recent measurements using decays such as $B^0 \rightarrow DK^{*0}, B^{\pm} \rightarrow [D\pi^0/\gamma]_{D^*}h^{\pm}$ (where $D$ decays to $K_{S}^{0} h^+h^-$ with $h=K, \pi$) and $B^{\pm} \rightarrow [h'^+h'^-\pi^+\pi^-]_Dh^{\pm}$ are presented. Additionally, the combination of previous $\gamma$ measurements at LHCb, excluding the aforementioned results, is also presented. The LHCb result, with a precision of $(63.8^{+3.5}_{-3.7})^{\circ}$ establishes itself as a dominant measurement in this field.

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  1. Semileptonic $D_{e4}$ decays: hadronic dynamics and the determination of $|V_{cs}|$

    hep-ph 2025-06 conditional novelty 4.0 of 10

    Using a K*(892)+D*(2010) pole model fitted to BESIII data, the authors show the D* pole can mimic the S-wave contribution previously attributed to the kappa scalar meson in D_{e4} decays.

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