Using (1.0087 pm 0.0044) × 10^10 J/ψ events collected by the BESIII detector at the BEPCII collider, we report the first search for the baryon and lepton number violating decays Ξ0 → K−e+ with Δ(B − L) = 0 and Ξ0 → K+e− with |Δ(B − L)| = 2, where B (L) is the baryon (lepton) number. While no signal is observed, the upper limits on the branching fractions of these two decays are set to B(Ξ0 → K−e+) < 3.6 × 10−6 and B(Ξ0 → K+e−) < 1.9 × 10−6 at the 90% confidence level, respectively. These results offer a direct probe of baryon number violating interactions involving a strange quark.

Search for baryon and lepton number violating decays of Ξ0 hyperons

I. Garzia;M. Scodeggio;
2023

Abstract

Using (1.0087 pm 0.0044) × 10^10 J/ψ events collected by the BESIII detector at the BEPCII collider, we report the first search for the baryon and lepton number violating decays Ξ0 → K−e+ with Δ(B − L) = 0 and Ξ0 → K+e− with |Δ(B − L)| = 2, where B (L) is the baryon (lepton) number. While no signal is observed, the upper limits on the branching fractions of these two decays are set to B(Ξ0 → K−e+) < 3.6 × 10−6 and B(Ξ0 → K+e−) < 1.9 × 10−6 at the 90% confidence level, respectively. These results offer a direct probe of baryon number violating interactions involving a strange quark.
2023
Ablikim, M.; Achasov, M. N.; Adlarson, P.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Batozskaya, V.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2530498
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