We present the first search for the lepton-flavor-violating decay modes B0→KS0τ±ℓ∓ (ℓ=μ,e) using the 711 and 365 fb-1 data samples recorded by the Belle and Belle II detectors, respectively. We use a hadronic B-tagging technique to fully reconstruct a B meson and search for signal decays in the system recoiling against the tagged meson, considering τ decays to either light leptons, one charged hadron, or one charged hadron and a neutral pion. We find no evidence for B0→KS0τ±ℓ∓ decays and set 90% confidence level upper limits on the branching fractions in the range of [0.8,3.6]×10-5.

Search for Lepton-Flavor-Violating Decay Modes B0→K0s τ± ℓ∓ with Hadronic B Tagging at Belle and Belle II

Bianchi, F.;Boschetti, A.;Destefanis, M.;Maggiora, M.;Marcello, S.;Mussa, R.;Spataro, S.;Tamponi, U.;
2025-01-01

Abstract

We present the first search for the lepton-flavor-violating decay modes B0→KS0τ±ℓ∓ (ℓ=μ,e) using the 711 and 365 fb-1 data samples recorded by the Belle and Belle II detectors, respectively. We use a hadronic B-tagging technique to fully reconstruct a B meson and search for signal decays in the system recoiling against the tagged meson, considering τ decays to either light leptons, one charged hadron, or one charged hadron and a neutral pion. We find no evidence for B0→KS0τ±ℓ∓ decays and set 90% confidence level upper limits on the branching fractions in the range of [0.8,3.6]×10-5.
2025
135
4
041801-1
041801-8
Adachi, I.; Adamczyk, K.; Aggarwal, L.; Ahmed, H.; Aihara, H.; Akopov, N.; Alhakami, M.; Aloisio, A.; Althubiti, N.; Ky, N. Anh; Asner, D. M.; Atmacan...espandi
File in questo prodotto:
File Dimensione Formato  
yzvh-v3hm.pdf

Accesso aperto

Tipo di file: PDF EDITORIALE
Dimensione 454.41 kB
Formato Adobe PDF
454.41 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2121112
Citazioni
  • ???jsp.display-item.citation.pmc??? 1
  • Scopus 2
  • ???jsp.display-item.citation.isi??? 0
social impact