Study of the Reactions n¯ p →2π+π-, 2π+π-π0, and 2π+π-2π0 Using J/ψ →pπ-n¯

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, Q.; Bai, Y.; Bakina, O.; Ban, Y.; Bao, H. R.; Bao, X. L.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M. B.; Bettoni, D.; Bianchi, F.; Bianco, E.; Bortone, A.; Boyko, I.; Briere, R. A.; Brueggemann, A.; Cai, H.; Cai, M. H.; Cai, X.; Calcaterra, A.; Cao, G. F.; Cao, N.; Cetin, S. A.; Chai, X. Y.; Chang, J. F.; Chang, T. T.; Che, G. R.; Che, Y. Z.; Chen, C. H.; Chen, Chao; Chen, G.; Chen, H. S.; Chen, H. Y.; Chen, M. L.; Chen, S. J.; Chen, S. M.; Chen, T.; Chen, W.; Chen, X. R.; Chen, X. T.; Chen, X. Y.; Chen, Y. B.; Chen, Y. Q.; Chen, Z. K.; Cheng, J.; Cheng, L. N.; Choi, S. K.; Chu, X.; Cibinetto, G.; Cossio, F.; Cottee-Meldrum, J.; Dai, H. L.; Dai, J. P.; Dai, X. C.; Dbeyssi, A.; De Boer, R. E.; Dedovich, D.; Deng, C. Q.; Deng, Z. Y.; Denig, A.; Denisenko, I.; Destefanis, M.; De Mori, F.; Ding, X. X.; Ding, Y.; Ding, Y. X.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dong, X.; Du, M. C.; Du, S. X.; Du, X. L.; Duan, Y. Y.; Duan, Z. H.; Egorov, P.; Fan, G. F.; Fan, J. J.; Fan, Y. H.; Fang, J.; Fang, S. S.; Fang, W. X.; Fang, Y. Q.; Fava, L.; Feldbauer, F.; Felici, G.; Feng, C. Q.; Feng, J. H.; Feng, L.; Feng, Q. X.; et al.

doi:10.1103/nm5t-qk3h

research article

Study of the Reactions n¯ p →2π+π-, 2π+π-π0, and 2π+π-2π0 Using J/ψ →pπ-n¯

Ablikim, M.

•

Achasov, M. N.

•

Adlarson, P.

July 17, 2026

Physical Review Letters

We report an experimental investigation of the reactions n¯p→2π+π-, n¯p→2π+π-π0, and n¯p→2π+π-2π0 using (10.087±0.044)×109 J/ψ events collected with the BESIII detector at the BEPCII storage ring. The antineutron (n¯) is produced in the decay J/ψ→pπ-n¯ with studied momentum from 200 to 1174 MeV/c, while the target proton originates from the hydrogen nuclei in the cooling oil of the beam pipe. This novel method pioneers the study of n¯-nucleon interactions at an e+e- collider, providing the first experimental data for n¯ momenta exceeding 800 MeV/c.

Cite this item

Ablikim, M., Achasov, M. N., Adlarson, P., Ai, X. C., Aliberti, R., Amoroso, A., An, Q., Bai, Y., Bakina, O., Ban, Y., Bao, H. R., Bao, X. L., Batozskaya, V., Begzsuren, K., Berger, N., Berlowski, M., Bertani, M. B., Bettoni, D., Bianchi, F., et al. (2026). Study of the Reactions n¯ p →2π+π-, 2π+π-π0, and 2π+π-2π0 Using J/ψ →pπ-n¯. Physical Review Letters, 137(3), Article 031902. https://doi.org/10.1103/nm5t-qk3h

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