Journal article
Search for a massless particle beyond the Standard Model in the Ξ 0 → Λ + invisible decay
- Abstract:
- A search for a massless beyond-standard-model particle is performed in the decay Ξ0 → Λ + invisible using (1.0087 ± 0.0044) × 1010J/ψ events collected with the BESIII detector at the BEPCII collider. No significant signal is observed and the upper limit on the branching fraction ℬ(Ξ0 → Λ + invisible) is set to be 2.3 × 10−4 at the 90% confidence level. This is the first search for a flavor-changing neutral current process with missing energy in Ξ0 decays. Throughout this paper, charge-conjugate processes are always implied.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 1.2MB, Terms of use)
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- Publisher copy:
- 10.1007/jhep05(2026)073
Authors
+ National Natural Science Foundation of China
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- Funder identifier:
- https://ror.org/01h0zpd94
- Grant:
- 11635010
+ U.S. Department of Energy
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- Funder identifier:
- 10.13039/100000015
- Grant:
- DE-FG02-05ER41374
+ Polish National Science Centre
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- Funder identifier:
- 10.13039/501100004281
- Grant:
- 2024/53/B/ST2/00975
+ Swedish Research Council
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- Funder identifier:
- https://ror.org/03zttf063
- Grant:
- 2019.04595
+ National Research Foundation of Korea
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- Funder identifier:
- https://ror.org/013aysd81
- Grant:
- NRF-2022R1A2C1092335
- Publisher:
- Springer
- Journal:
- Journal of High Energy Physics More from this journal
- Volume:
- 2026
- Issue:
- 5
- Article number:
- 73
- Publication date:
- 2026-05-08
- Acceptance date:
- 2026-03-19
- DOI:
- EISSN:
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1029-8479
- ISSN:
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1126-6708
- Language:
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English
- Keywords:
- Source identifiers:
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4041174
- Deposit date:
-
2026-05-13
- ARK identifier:
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Terms of use
- Copyright date:
- 2026
- Licence:
- CC Attribution (CC BY)
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