We present a search for the baryon number B and lepton number L violating decays τ-→Λπ- and τ-→Λ¯π- produced from the e+e-→τ+τ- process, using a 364 fb-1 data sample collected by the Belle II experiment at the SuperKEKB collider. No evidence of signal is found in either decay mode, which have |Δ(B-L)| equal to 2 and 0, respectively. Upper limits at 90% credibility level on the branching fractions of τ-→Λπ- and τ-→Λ¯π- are determined to be 4.7×10-8 and 4.3×10-8, respectively.
Adachi, I., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., Aloisio, A., et al. (2024). Search for the baryon number and lepton number violating decays τ−→Λπ− and τ−→Λ¯π− at Belle II. PHYSICAL REVIEW D, 110(11), 112003-1-112003-8 [10.1103/physrevd.110.112003].
Search for the baryon number and lepton number violating decays τ−→Λπ− and τ−→Λ¯π− at Belle II
Branchini, P.Membro del Collaboration Group
;Budano, A.Membro del Collaboration Group
;Bussino, S.Membro del Collaboration Group
;De Pietro, G.Membro del Collaboration Group
;Laurenza, M.Membro del Collaboration Group
;Martellini, C.Membro del Collaboration Group
;Martini, A.Membro del Collaboration Group
;Rizzo, G.;
2024-01-01
Abstract
We present a search for the baryon number B and lepton number L violating decays τ-→Λπ- and τ-→Λ¯π- produced from the e+e-→τ+τ- process, using a 364 fb-1 data sample collected by the Belle II experiment at the SuperKEKB collider. No evidence of signal is found in either decay mode, which have |Δ(B-L)| equal to 2 and 0, respectively. Upper limits at 90% credibility level on the branching fractions of τ-→Λπ- and τ-→Λ¯π- are determined to be 4.7×10-8 and 4.3×10-8, respectively.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.