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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, 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.
Physics letters. B, 20/May , Volume: 852Journal Article
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.
