Search for Λ ¯ - Λ Baryon-Number-Violating Oscillations in the Decay J/ψ →pK- Λ ¯ + c. c

BESIII Collaboration; N. Kalantar-Nayestanaki; R. Kappert; M. Kavatsyuk; J. Messchendorp; V. Rodin

doi:10.1103/PhysRevLett.131.121801

Search for Λ ¯ - Λ Baryon-Number-Violating Oscillations in the Decay J/ψ →pK- Λ ¯ + c. c

BESIII Collaboration, N. Kalantar-Nayestanaki, R. Kappert, M. Kavatsyuk, J. Messchendorp, V. Rodin

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Abstract

We report on the first search for Λ¯-Λ oscillations in the decay J/ψ→pK-Λ¯+c.c. by analyzing 1.31×109 J/ψ events accumulated with the BESIII detector at the BEPCII collider. The J/ψ events are produced using e+e- collisions at a center of mass energy s=3.097 GeV. No evidence for hyperon oscillations is observed. The upper limit for the oscillation rate of Λ¯ to Λ hyperons is determined to be P(Λ)=[B(J/ψ→pK-Λ+c.c.)/B(J/ψ→pK-Λ¯+c.c.)]<4.4×10-6 corresponding to an oscillation parameter δmΛΛ¯ of less than 3.8×10-18 GeV at the 90% confidence level.

Original language	English
Article number	121801
Number of pages	7
Journal	Physical Review Letters
Volume	131
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.131.121801
Publication status	Published - 19-Sept-2023

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Search for ¯ Λ − Λ Baryon-Number-Violating Oscillations in the Decay J / ψ → p K − ¯ Λ + c . c .Final publisher's version, 248 KBLicence: CC BY

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@article{a968ee1b8751444a8be077892033cb70,

title = "Search for Λ ¯ - Λ Baryon-Number-Violating Oscillations in the Decay J/ψ →pK- Λ ¯ + c. c",

abstract = "We report on the first search for Λ¯-Λ oscillations in the decay J/ψ→pK-Λ¯+c.c. by analyzing 1.31×109 J/ψ events accumulated with the BESIII detector at the BEPCII collider. The J/ψ events are produced using e+e- collisions at a center of mass energy s=3.097 GeV. No evidence for hyperon oscillations is observed. The upper limit for the oscillation rate of Λ¯ to Λ hyperons is determined to be P(Λ)=[B(J/ψ→pK-Λ+c.c.)/B(J/ψ→pK-Λ¯+c.c.)]<4.4×10-6 corresponding to an oscillation parameter δmΛΛ¯ of less than 3.8×10-18 GeV at the 90% confidence level.",

author = "{BESIII Collaboration} and M. Ablikim and Achasov, {M. N.} and N. Kalantar-Nayestanaki and R. Kappert and M. Kavatsyuk and J. Messchendorp and V. Rodin",

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AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Kalantar-Nayestanaki, N.

AU - Kappert, R.

AU - Kavatsyuk, M.

AU - Messchendorp, J.

AU - Rodin, V.

N1 - Publisher Copyright: © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.

PY - 2023/9/19

Y1 - 2023/9/19

N2 - We report on the first search for Λ¯-Λ oscillations in the decay J/ψ→pK-Λ¯+c.c. by analyzing 1.31×109 J/ψ events accumulated with the BESIII detector at the BEPCII collider. The J/ψ events are produced using e+e- collisions at a center of mass energy s=3.097 GeV. No evidence for hyperon oscillations is observed. The upper limit for the oscillation rate of Λ¯ to Λ hyperons is determined to be P(Λ)=[B(J/ψ→pK-Λ+c.c.)/B(J/ψ→pK-Λ¯+c.c.)]<4.4×10-6 corresponding to an oscillation parameter δmΛΛ¯ of less than 3.8×10-18 GeV at the 90% confidence level.

AB - We report on the first search for Λ¯-Λ oscillations in the decay J/ψ→pK-Λ¯+c.c. by analyzing 1.31×109 J/ψ events accumulated with the BESIII detector at the BEPCII collider. The J/ψ events are produced using e+e- collisions at a center of mass energy s=3.097 GeV. No evidence for hyperon oscillations is observed. The upper limit for the oscillation rate of Λ¯ to Λ hyperons is determined to be P(Λ)=[B(J/ψ→pK-Λ+c.c.)/B(J/ψ→pK-Λ¯+c.c.)]<4.4×10-6 corresponding to an oscillation parameter δmΛΛ¯ of less than 3.8×10-18 GeV at the 90% confidence level.

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JF - Physical Review Letters

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M1 - 121801

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Search for Λ ¯ - Λ Baryon-Number-Violating Oscillations in the Decay J/ψ →pK- Λ ¯ + c. c

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