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Search for the charged lepton flavor violating decay η→ e±μ∓
Abstract
Based on (10.087 ± 0.044) × 109 J/ψ events collected at the center-of-mass energy √s = 3.097~GeV with the BESIII detector, we search for the charged lepton flavor violating decay η→ e±μ∓ through the process J/ψ→ γη' with η' → π+ π− η. No signal is observed, and an upper limit on the branching fraction is determined to be ℬ(η→ e±μ∓) < 6.8 × 10−7 at the 90\% confidence level. This result improves the previous best limit by one order of magnitude.
Versions
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BibTeX
@misc{ablikim2026search,
title = {{Search for the charged lepton flavor violating decay $η\to e^\pmμ^\mp$}},
author = {M. Ablikim and M. N. Achasov and P. Adlarson and X. C. Ai and C. S. Akondi and R. Aliberti and A. Amoroso and Q. An and Y. H. An and Y. Bai and O. Bakina and H. R. Bao and X. L. Bao and M. Barbagiovanni and V. Batozskaya and K. Begzsuren and N. Berger and M. Berlowski and M. B. Bertani and D. Bettoni and F. Bianchi and E. Bianco and A. Bortone and I. Boyko and R. A. Briere and A. Brueggemann and D. Cabiati and H. Cai and M. H. Cai and X. Cai and A. Calcaterra and G. F. Cao and N. Cao and S. A. Cetin and X. Y. Chai and J. F. Chang and T. T. Chang and G. R. Che and Y. Z. Che and C. H. Chen and G. Chen and H. S. Chen and H. Y. Chen and M. L. Chen and S. J. Chen and S. M. Chen and T. Chen and W. Chen and X. R. Chen and X. T. Chen and X. Y. Chen and Y. B. Chen and Y. Q. Chen and Z. K. Chen and J. Cheng and L. N. Cheng and S. K. Choi and X. Chu and G. Cibinetto and F. Cossio},
howpublished = {arXiv},
year = {2026},
month = jun,
doi = {10.48550/arxiv.2606.22373},
eprint = {2606.22373},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.22373},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Search for the charged lepton flavor violating decay η→ e^±μ^∓
AU - M. Ablikim
AU - M. N. Achasov
AU - P. Adlarson
AU - X. C. Ai
AU - C. S. Akondi
AU - R. Aliberti
AU - A. Amoroso
AU - Q. An
AU - Y. H. An
AU - Y. Bai
AU - O. Bakina
AU - H. R. Bao
AU - X. L. Bao
AU - M. Barbagiovanni
AU - V. Batozskaya
AU - K. Begzsuren
AU - N. Berger
AU - M. Berlowski
AU - M. B. Bertani
AU - D. Bettoni
AU - F. Bianchi
AU - E. Bianco
AU - A. Bortone
AU - I. Boyko
AU - R. A. Briere
AU - A. Brueggemann
AU - D. Cabiati
AU - H. Cai
AU - M. H. Cai
AU - X. Cai
AU - A. Calcaterra
AU - G. F. Cao
AU - N. Cao
AU - S. A. Cetin
AU - X. Y. Chai
AU - J. F. Chang
AU - T. T. Chang
AU - G. R. Che
AU - Y. Z. Che
AU - C. H. Chen
AU - G. Chen
AU - H. S. Chen
AU - H. Y. Chen
AU - M. L. Chen
AU - S. J. Chen
AU - S. M. Chen
AU - T. Chen
AU - W. Chen
AU - X. R. Chen
AU - X. T. Chen
AU - X. Y. Chen
AU - Y. B. Chen
AU - Y. Q. Chen
AU - Z. K. Chen
AU - J. Cheng
AU - L. N. Cheng
AU - S. K. Choi
AU - X. Chu
AU - G. Cibinetto
AU - F. Cossio
PY - 2026
DA - 2026/06/21
PB - arXiv
DO - 10.48550/arxiv.2606.22373
UR - https://arxiv.org/abs/2606.22373
AB - Based on (10.087 ± 0.044) × 10^9 J/ψ events collected at the center-of-mass energy √s = 3.097~GeV with the BESIII detector, we search for the charged lepton flavor violating decay η→ e^±μ^∓ through the process J/ψ→ γη' with η' → π^+ π^− η. No signal is observed, and an upper limit on the branching fraction is determined to be ℬ(η→ e^±μ^∓) < 6.8 × 10^−7 at the 90\% confidence level. This result improves the previous best limit by one order of magnitude.
ER -