A. Fodor

Search for the lepton-flavor-violating τ− → e∓ℓ±ℓ− decays at Belle II

I. Adachi, L. Aggarwal, H. Ahmed, Y. H. Ahn et autres

A bstract We present the result of a search for the charged-lepton-flavor violating decays τ − → e ∓ ℓ ± ℓ − , where ℓ is a muon or an electron, using a data sample with an integrated luminosity of 428 …

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Search for an axion-like particle in B → K(*)a(→ γγ) decays at Belle

Ichiro Adachi, L. Aggarwal, H. Ahmed, Y. H. Ahn et autres

A bstract We report a search for an axion-like particle a in B → K (*) a decays using data collected with the Belle detector at the KEKB asymmetric-energy electron-positron collider. The search is based on a 711 fb − 1 data …

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Charged-hadron identification at Belle II

Ichiro Adachi, H. Ahmed, Y. H. Ahn, H. Aihara et autres

Abstract The Belle II experiment’s ability to identify particles critically affects the sensitivity of its measurements. We describe Belle II’s algorithms for identifying charged particles and evaluate their performance in separating pions, kaons, and protons using $$426\,\text {fb}^{-1}$$ 426 fb - 1 …

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Search for B0→K*0τ+τ− Decays at the Belle II Experiment

Ichiro Adachi, K. Adamczyk, L. Aggarwal, H. Ahmed et autres

We present a search for the rare flavor-changing neutral-current decay B^{0}→K^{*0}τ^{+}τ^{-} with data collected by the Belle II experiment at the SuperKEKB electron-positron collider. The analysis uses a 365 fb^{-1} data sample recorded at the center-of-mass energy of the ϒ(4S) resonance. One …

Measurement of B+→τ+ντ branching fraction with a hadronic tagging method at Belle II

Ichiro Adachi, K. Adamczyk, H. Ahmed, Y. H. Ahn et autres

We present a measurement of the branching fraction of B+→τ+ντ decays using 387±6×106 ϒ(4S) collected between 2019 and 2022 with the Belle II detector at the SuperKEKB e+e− collider. We reconstruct the accompanying B− meson using the hadronic tagging method, while B+→τ+ντ …

Measurement of the D 0 → K − π + e + e − branching fraction and search for D 0 → π + π − e + e − and D 0 → K + K − e + e − decays at Belle

Ichiro Adachi, L. Aggarwal, H. Ahmed, Y. H. Ahn et autres

We present a study of the rare charm meson decays D 0 → K + K − e + e − , π + π − e + e − , and K − π + e + e − using a …

Measurement of B → K*(892)γ decays at Belle II

Ichiro Adachi, L. Aggarwal, H. Ahmed, H. Aihara et autres

Abstract We present measurements of B → K *(892)γ decays using 365 fb −1 of data collected from 2019 to 2022 by the Belle II experiment at the SuperKEKB asymmetric-energy e + e − collider. The data sample contains (387 ± 6) …

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Measurements of the branching fractions of $${\Xi }_{c}^{+}\to {\Sigma }^{+}{K}_{S}^{0}$$, $${\Xi }_{c}^{+}\to {\Xi }^{0}{\pi }^{+}$$, and $${\Xi }_{c}^{+}\to {\Xi }^{0}{K}+$$ at Belle and Belle II

Ichiro Adachi, J. K. Ahn, Y. H. Ahn, N. Z. Akopov et autres

Abstract Using 983.0 fb −1 and 427.9 fb −1 data samples collected with the Belle and Belle II detectors at the KEKB and SuperKEKB asymmetric energy e + e − colliders, respectively, we present studies of the Cabibbo-favored $${\Xi }_{c}^{+}$$ decays $${\Xi …

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Search for lepton-flavor-violating $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ decays at Belle and Belle II

Ichiro Adachi, L. Aggarwal, H. Ahmed, Y. H. Ahn et autres

Abstract We present the results of a search for charged-lepton-flavor violating decays $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ , where ℓ − is either an electron or a muon. We combine e + e − data samples recorded by the Belle II experiment at the …

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Search for a Dark Higgs Boson Produced in Association with Inelastic Dark Matter at the Belle II Experiment

Ichiro Adachi, L. Aggarwal, H. Ahmed, H. Aihara et autres

Inelastic dark matter models that have two dark matter particles and a massive dark photon can reproduce the observed relic dark matter density without violating cosmological limits. The mass splitting between the two dark matter particles χ_{1} and χ_{2}, with m(χ_{2})>m(χ_{1}), is …

Test of lepton flavor universality with measurements of R(D+) and R(D*+) using semileptonic B tagging at the Belle II experiment

K. Adamczyk, L. Aggarwal, H. Ahmed, H. Aihara et autres

We report measurements of the ratios of branching fractions R(D(*)+)=B(B¯0→D(*)+τ−ν¯τ)/B(B¯0→D(*)+ℓ−ν¯ℓ) , where ℓ denotes either an electron or a muon. These ratios test the universality of the charged-current weak interaction. The results are based on a 365 fb−1 data sample collected with …

Measurement of the time-integrated C P asymmetry in D 0 → π 0 π 0 decays at Belle II

Y. H. Ahn, N. Z. Akopov, Saleh A. Alghamdi, M. Alhakami et autres

We measure the time-integrated C P asymmetry, A C P , in D 0 → π 0 π 0 decays reconstructed in e + e − → c c ¯ events collected by Belle II during 2019–2022. The data corresponds to an …