Constraining |Vcs| and physics beyond the Standard Model from exclusive (semi)leptonic charm decays

Bolognani, Carolina; Reboud, Méril; van Dyk, Danny; Vos, K. Keri

doi:10.1007/JHEP09(2024)099

Constraining |V_cs| and physics beyond the Standard Model from exclusive (semi)leptonic charm decays

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Published: 18 September 2024

Volume 2024, article number 99, (2024)
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Constraining |V_cs| and physics beyond the Standard Model from exclusive (semi)leptonic charm decays

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Abstract

We study the available data on exclusive leptonic and semileptonic c → sℓ⁺ν decays within the Standard Model and beyond. Our analysis accounts for theory correlations between the relevant hadronic matrix elements through application of dispersive bounds. We find that, within a global analysis, the dispersive bounds are generally well respected and only mildly affect the extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |V_cs|. Assuming Standard Model dynamics, we obtain

$$ \left|{V}_{cs}\right|=0.957\pm 0.003, $$

which is compatible with the HFLAV/PDG reference value |V_cs| = 0.975 ± 0.006 at the 2.7σ level. Our findings lead to significant deficits in the second-row and second-column unitarity relations of the CKM matrix. Allowing for beyond the SM contributions in the Weak Effective Theory, we find very strong constraints on potential (pseudo)scalar and tensor effects. However, the data still permits sizeable CP-violating right-handed currents.

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Charming penguins and lepton universality violation in $\varvec{b \rightarrow s \ell ^+ \ell ^-}$ decays

Article Open access 24 January 2023

Mapping out the space for new physics with leptonic and semileptonic $B_{(c)}$ decays

Article Open access 27 July 2021

Inclusive semileptonic $ b\to c\ell \overline{\nu} $ decays to order $ 1/{m}_b^5 $

Article Open access 28 February 2024

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Acknowledgments

We thank Augusto Ceccucci, Zoltan Ligeti, and Yoshihide Sakai for useful communication on the section “CKM Quark-Mixing Matrix” within the Particle Data Group’s Review of Particle Physics [1]. We would like to thank Admir Greljo, Matthew Kirk, and Wolfgang Altmannshofer for useful comments on the manuscript. DvD acknowledges support by the UK Science and Technology Facilities Council (grant numbers ST/V003941/1 and ST/X003167/1). KKV acknowledges support from the Dutch Research Council (NWO) in the form of the VIDI grant “Solving Beautiful Puzzles”.

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Gravitational Waves and Fundamental Physics (GWFP), Maastricht University, Duboisdomein 30, NL-6229 GT, Maastricht, the Netherlands
Carolina Bolognani & K. Keri Vos
Nikhef, Science Park 105, NL-1098 XG, Amsterdam, the Netherlands
Carolina Bolognani & K. Keri Vos
Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405, Orsay, France
Méril Reboud
Institute for Particle Physics Phenomenology and Department of Physics, Durham University, Durham, DH1 3LE, UK
Danny van Dyk

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Carolina Bolognani
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Bolognani, C., Reboud, M., van Dyk, D. et al. Constraining |V_cs| and physics beyond the Standard Model from exclusive (semi)leptonic charm decays. J. High Energ. Phys. 2024, 99 (2024). https://doi.org/10.1007/JHEP09(2024)099

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Received: 22 July 2024
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Published: 18 September 2024
DOI: https://doi.org/10.1007/JHEP09(2024)099

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Constraining |V_cs| and physics beyond the Standard Model from exclusive (semi)leptonic charm decays

Abstract

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Charming penguins and lepton universality violation in \(\varvec{b \rightarrow s \ell ^+ \ell ^-}\) decays

Mapping out the space for new physics with leptonic and semileptonic \(B_{(c)}\) decays

Inclusive semileptonic \( b\to c\ell \overline{\nu} \) decays to order \( 1/{m}_b^5 \)

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Keywords

Constraining |Vcs| and physics beyond the Standard Model from exclusive (semi)leptonic charm decays

Abstract

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Charming penguins and lepton universality violation in \(\varvec{b \rightarrow s \ell ^+ \ell ^-}\) decays

Mapping out the space for new physics with leptonic and semileptonic \(B_{(c)}\) decays

Inclusive semileptonic \( b\to c\ell \overline{\nu} \) decays to order \( 1/{m}_b^5 \)

References

Acknowledgments

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Authors and Affiliations

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Keywords

Constraining |V_cs| and physics beyond the Standard Model from exclusive (semi)leptonic charm decays