Implications for the 
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 anomaly in 
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Bhattacharya, Bhubanjyoti; Browder, T. E.; Campagna, Quinn; Datta, Alakabha; Dubey, S.; Mukherjee, Lopamudra; Sibidanov, A.

doi:10.1103/physrevd.107.015011

Cited by 6 publications

(1 citation statement)

References 50 publications

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“…[22], we present the first measurement of a complete set of angular asymmetry observables, called 𝐴 FB , 𝑆 3 , 𝑆 5 , 𝑆 7 , and 𝑆 9 , as a test of light-lepton universality. In a comparison of these observables between electrons and muons, most theoretical and experimental uncertainties cancel, resulting in high sensitivity to LUV [23]. They are obtained by formulating disjoint oneor two-dimensional integrals of the differential decay rate as a function of the recoil parameter 𝑤 = (𝑚 2 𝐵 + 𝑚 2 𝐷 * − 𝑞 2 )/(2𝑚 𝐵 𝑚 𝐷 * ) and the helicity angles cos 𝜃 ℓ , cos 𝜃 𝑉 , and 𝜒.…”

Section: Measurement Of a Complete Set Of Angular Asymmetries In 𝐵mentioning

confidence: 99%

Lepton universality tests and searches for new physics in charged current decays at Belle II

Junkerkalefeld

2024

Proceedings of 16th International Conference on Heavy Quarks and Leptons — PoS(HQL2023)

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We present recent tests of lepton universality as crucial probes of the Standard Model in semileptonic 𝐵-meson decays at Belle II. All presented analyses use a data sample collected at the 𝛶(4𝑆) resonance by the Belle II experiment corresponding to an integrated luminosity of 189 fb −1 . We report three analyses that probe light-lepton universality: The first measurement of a complete set of five angular asymmetries using 𝐵 0 → 𝐷 * + ℓ − 𝜈 ℓ decays, followed by a measurement of the forward-backward asymmetry in untagged 𝐵 0 → 𝐷 * + ℓ − 𝜈 ℓ decays, and finally, measurements of the branching-fraction ratios 𝑅(𝐷 * + 𝑒/𝜇 ) = B (𝐵 0 → 𝐷 * + 𝑒 − 𝜈 𝑒 )/B (𝐵 0 → 𝐷 * + 𝜇 − 𝜈 𝜇 ), using the same untagged data set, along with the first measurement of the inclusive light-lepton ratio 𝑅(𝑋 𝑒/𝜇 ) = B (𝐵 → 𝑋𝑒 − 𝜈 𝑒 )/B (𝐵 → 𝑋 𝜇 − 𝜈 𝜇 ). Furthermore, we present two tests of heavy-to-light lepton universality. In the first test, we report the measurement of the branching-fraction ratio 𝑅(𝐷 * 𝜏/ℓ ) using hadronic tagging. In the second test, we present the first measurement of the inclusive ratio 𝑅(𝑋 𝜏/ℓ ). All presented results are consistent with their corresponding Standard Model predictions and, where applicable, with the experimental world averages.

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Section: Measurement Of a Complete Set Of Angular Asymmetries In 𝐵mentioning

confidence: 99%

Lepton universality tests and searches for new physics in charged current decays at Belle II

Junkerkalefeld

2024

Proceedings of 16th International Conference on Heavy Quarks and Leptons — PoS(HQL2023)

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Machine Learning for New Physics Searches in B → K*⁰µ⁺µ⁻ Decays

Dubey,

Browder,

Kohani

et al. 2024

EPJ Web of Conf.

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We report the status of a neural network regression model trained to extract new physics (NP) parameters in Monte Carlo (MC) simulation data. We utilize a new EvtGen NP MC generator to generate B → K*0µ+µ− events according to the deviation of the Wilson Coefficient C9 from its SM value, δC9. We train a three-dimensional ResNet regression model, using images built from the angular observables and the invariant mass of the di-muon system, to extract values of δ C9 directly from the MC data samples. This work is intended for future analyses at the Belle II experiment but may also find applicability at other experiments.

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Measurements of lepton-flavour universality in semileptonic B decays at Belle and Belle II

Mantovano

2024

EPJ Web Conf.

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The Belle and Belle II experiments have collected a 1.1 ab−1 sample of e+e− BB¯ collisions at the ϒ(4S ) resonance. These data, with low particle multiplicity, constrained initial state kinematics and excellent lepton identification, are an ideal environment to study lepton-flavour universality in semileptonic decays of the B meson. We present measurements of branching-fraction ratios that test the universality of τ and light leptons, using both exclusive and inclusive B semileptonic decays. We also report measurements of angular observables that probe universality between electrons and muons.

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Implications for the ΔAFB anomaly in B¯0→

Cited by 6 publications

References 50 publications

Lepton universality tests and searches for new physics in charged current decays at Belle II

Lepton universality tests and searches for new physics in charged current decays at Belle II

Machine Learning for New Physics Searches in B → K*⁰µ⁺µ⁻ Decays

Measurements of lepton-flavour universality in semileptonic B decays at Belle and Belle II

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Implications for the ΔAFB anomaly in B¯0→

Cited by 6 publications

References 50 publications

Lepton universality tests and searches for new physics in charged current decays at Belle II

Lepton universality tests and searches for new physics in charged current decays at Belle II

Machine Learning for New Physics Searches in B → K*0µ+µ− Decays

Measurements of lepton-flavour universality in semileptonic B decays at Belle and Belle II

Contact Info

Product

Resources

About

Machine Learning for New Physics Searches in B → K*⁰µ⁺µ⁻ Decays