Search for the lepton number violating process Ξ−→Σ+e−e−+c.c

J.H.ZouBESIII Collaboration

doi:10.1016/j.physletb.2026.140723

Search for the lepton number violating process Ξ−→Σ+e−e−+c.c

J.H.ZouBESIII Collaboration

Institute of Higher Research

CAS - Institute of High Energy Physics
Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
Uppsala University
Zhengzhou University

Research output: Contribution to journal › Article › peer-review

Abstract

We present a search for the lepton number violating decay Ξ⁻→Σ⁺e⁻e⁻+c.c. with (10087 ± 44) × 10⁶ J / ψ events collected by the BESIII detector at the BEPCII collider, which provided a sample of Ξ⁻Ξ¯⁺ pairs. Employing a blind analysis strategy, no significant signal is observed above the expected background yield. The upper limit on the branching fraction is determined to be BF(Ξ⁻→Σ⁺e⁻e⁻)'2.0×10⁻⁵ at the 90% confidence level.

Original language	English
Article number	140723
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	880
DOIs	https://doi.org/10.1016/j.physletb.2026.140723
State	Published - Sep 2026

Keywords

BESIII
Lepton number violating
Majorana neutrino

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10.1016/j.physletb.2026.140723

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@article{9ae584edc58e42708ac89d278726be83,

title = "Search for the lepton number violating process Ξ−→Σ+e−e−+c.c",

abstract = "We present a search for the lepton number violating decay Ξ−→Σ+e−e−+c.c. with (10087 ± 44) {\texttimes} 106 J / ψ events collected by the BESIII detector at the BEPCII collider, which provided a sample of Ξ−Ξ¯+ pairs. Employing a blind analysis strategy, no significant signal is observed above the expected background yield. The upper limit on the branching fraction is determined to be BF(Ξ−→Σ+e−e−)'2.0{\texttimes}10−5 at the 90\% confidence level.",

keywords = "BESIII, Lepton number violating, Majorana neutrino",

author = "M. Ablikim and Achasov, \{M. N.\} and P. Adlarson and Ai, \{X. C.\} and S. Kabana and \{J.H.ZouBESIII Collaboration\}",

note = "Publisher Copyright: {\textcopyright} 2026 The Authors.",

year = "2026",

month = sep,

doi = "10.1016/j.physletb.2026.140723",

language = "English",

volume = "880",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

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TY - JOUR

T1 - Search for the lepton number violating process Ξ−→Σ+e−e−+c.c

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Adlarson, P.

AU - Ai, X. C.

AU - Kabana, S.

AU - J.H.ZouBESIII Collaboration

PY - 2026/9

Y1 - 2026/9

N2 - We present a search for the lepton number violating decay Ξ−→Σ+e−e−+c.c. with (10087 ± 44) × 106 J / ψ events collected by the BESIII detector at the BEPCII collider, which provided a sample of Ξ−Ξ¯+ pairs. Employing a blind analysis strategy, no significant signal is observed above the expected background yield. The upper limit on the branching fraction is determined to be BF(Ξ−→Σ+e−e−)'2.0×10−5 at the 90% confidence level.

AB - We present a search for the lepton number violating decay Ξ−→Σ+e−e−+c.c. with (10087 ± 44) × 106 J / ψ events collected by the BESIII detector at the BEPCII collider, which provided a sample of Ξ−Ξ¯+ pairs. Employing a blind analysis strategy, no significant signal is observed above the expected background yield. The upper limit on the branching fraction is determined to be BF(Ξ−→Σ+e−e−)'2.0×10−5 at the 90% confidence level.

KW - BESIII

KW - Lepton number violating

KW - Majorana neutrino

UR - https://www.scopus.com/pages/publications/105045114568

U2 - 10.1016/j.physletb.2026.140723

DO - 10.1016/j.physletb.2026.140723

M3 - Article

AN - SCOPUS:105045114568

SN - 0370-2693

VL - 880

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 140723

ER -

Search for the lepton number violating process Ξ−→Σ+e−e−+c.c

Abstract

Keywords

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