Search for a massless particle beyond the Standard Model in the Σ+ → p + invisible decay

A massless particle beyond the Standard Model is searched for in the two-body decay Σ+→p+invisible using (1.0087±0.0044)×1010J/ψ events collected at a center-of-mass energy of s=3.097GeV with the BESIII detector at the BEPCII collider. No significant signal is observed, and the upper limit on the br...

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Published inPhysics letters. B Vol. 852; p. 138614
Main Authors Ban, Y., Begzsuren, K., Bertani, M., Cao, G.F., Chang, J.F., Cui, J.J., de Boer, R.E., Deng, Z.Y., Denysenko, I., De Mori, F., Ding, X.X., Dong, L.Y., Duan, Z.H., Fan, Y.H., Fang, W.X., Feldbauer, F., Fritsch, M., Fu, J.L., Gao, X.B., Garbolino, S., Ge, Z.W., Geng, C., Gradl, W., Greco, M., Gu, Y.T., Guo, A.Q., Hao, X.Q., He, K.K., Herold, C., Hou, X.T., Hou, Y.R., Hu, B.Y., Huang, Y.P., Hüsken, N., Janchiv, S., Ji, Q., Ji, X.B., Jiao, J.K., Jiao, Z., Jin, Y., Khachatryan, V., Kopf, B., Li, C., Li, Hui, Li, Lei, Li, S.X., Li, T., Liang, Y.F., Liu, H., Liu, L.C., Liu, W.K., Liu, Y., Luo, T., Ma, H.L., Ma, L.L., Nefedov, Y., Nerling, F., Nikolaev, I.B., Ning, Z., Olsen, S.L., Qi, F.Z., Qi, M., Rivetti, A., Rolo, M., Ruan, S.N., Shen, H.F., Shen, X.Y., Shi, J.L., Spataro, S., Sun, J.F., Sun, K., Sun, S.S., Sun, W.Y., Sun, Y.J., Sun, Y.Z., Tang, M., Tao, L.Y., Wang, M., Wang, Meng, Wang, S., Wang, Y., Wang, Y.N., Wang, Z., Wu, L.J., Xiao, G.Y., Xu, M., Xu, X.P., Xu, Y.C., Xu, Z.P., Yan, X.Q., Yu, Y.C., Zafar, A.A., Zhang, Shuihan, Zhang, X.D., Zhao, M.G., Zhong, X., Zhou, H., Zhu, K., Zhu, K.J.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2024
Elsevier
Subjects
BESIII
BSM particle
FCNC process
Hyperon decay
Hyperon decay
BSM particle
BESIII
FCNC process
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Summary:A massless particle beyond the Standard Model is searched for in the two-body decay Σ+→p+invisible using (1.0087±0.0044)×1010J/ψ events collected at a center-of-mass energy of s=3.097GeV with the BESIII detector at the BEPCII collider. No significant signal is observed, and the upper limit on the branching fraction B(Σ+→p+invisible) is determined to be 3.2×10−5 at the 90% confidence level. This is the first search for a flavor-changing neutral current process with missing energy in hyperon decays which plays an important role in constraining new physics models.
ISSN:0370-2693
1873-2445
1873-2445
DOI:10.1016/j.physletb.2024.138614