Measurement of inelastic scattering Λ(Λ̅)+p→Σ⁰(Σ̅⁰)+p via e⁺e^-→ J/ψ→ΛΛ̅

@misc{collaboration2026measurement,
  title = {{Measurement of inelastic scattering $Λ(\overlineΛ)+p\toΣ^0(\overlineΣ^0)+p$ via $e^+e^-\to J/ψ\toΛ\overlineΛ$}},
  author = {BESIII Collaboration and 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 M. S. Anderson 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 Chao 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},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.02584},
  eprint = {2609.02584},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.02584},
}

TY  - UNPB
TI  - Measurement of inelastic scattering Λ(Λ̅)+p→Σ^0(Σ̅^0)+p via e^+e^-→ J/ψ→ΛΛ̅
AU  - BESIII Collaboration
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  - M. S. Anderson
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  - Chao 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
PY  - 2026
DA  - 2026/09/02
PB  - arXiv
DO  - 10.48550/arxiv.2609.02584
UR  - https://arxiv.org/abs/2609.02584
AB  - Using a sample of (10087±44)×10^6 J/ψ events collected with the BESIII detector, we investigate the inelastic scattering processes Λ+p→Σ^0+p and Λ̅+p→Σ̅^0+p, exploiting hyperons from J/ψ→ΛΛ̅ decays as an effective beam and the beam-pipe materials as targets. The processes Λ+^9Be→Σ^0+p+^8Li and Λ̅+^9Be→Σ̅^0+p+^8Li are measured at a hyperon momentum of 1.074 GeV/c, with cross sections of (10.1±1.4_stat±0.7_syst) mb and (1.7±0.6_stat±0.4_syst) mb, respectively. Under the assumption of surface-dominated hyperon-nucleus scattering, these measurements are used to extract the corresponding proton-target cross sections. Independently, direct measurements using the hydrogen component of the beam-pipe oil yield (3.2±1.1_stat±0.5_syst) mb for Λ+p→Σ^0+p and (1.5±0.5_stat±0.1_syst) mb for Λ̅+p→Σ̅^0+p, consistent with the indirect determinations. The combined cross sections are (4.7±0.7) mb and (1.1±0.3) mb, respectively. The Λ̅+p→Σ̅^0+p signal constitutes the first evidence for anti-hyperon inelastic scattering with baryonic final states, with a significance of 3.1σ. The pronounced difference between the Λp and Λ̅p inelastic scattering cross sections provides new experimental constraints on hyperon-nucleon and anti-hyperon-nucleon interactions.
ER  -