Measurement of the absolute branching fraction for Λc+→Λμ+νμ

Measurement of the absolute branching fraction for Λc+→Λμ+νμ

We report the first measurement of the absolute branching fraction for Λc+→Λμ+νμ. This measurement is based on a sample of e+e− annihilation data produced at a center-of-mass energy s=4.6 GeV, collected with the BESIII detector at the BEPCII storage rings. The sample corresponds to an integrated lum...

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Veröffentlicht in:Physics letters. B 2017-04, Vol.767 (C), p.42-47
Hauptverfasser: Ahmed, S., Ai, X.C., An, F.F., Bai, J.Z., Baldini Ferroli, R., Bertani, M., Cao, G.F., Cetin, S.A., Chen, S.J., Chen, X., Chen, Y.B., Denysenko, I., Du, S.X., Fava, L., Feng, C.Q., Gao, Z., Garzia, I., Guan, Y.H., Guo, Y.P., Harris, F.A., Heinsius, F.H., Heng, Y.K., Hu, Y., Ikegami Andersson, W., Kang, X.L., Kang, X.S., Ke, B.C., Kolcu, O.B., Kornicer, M., Kühn, W., Leithoff, H., Li, H.J., Li, K., Li, Lei, Li, T., Li, W.G., Liang, Y.F., Liu, B., Liu, C.X., Liu, Fang, Liu, J.P., Liu, K., Liu, K.Y., Liu, Q.J., Liu, S.B., Liu, Z.Q., Lou, X.C., Lu, H.J., Lu, J.G., Marcello, S., Messchendorp, J.G., Mezzadri, G., Min, J., Mo, Y.J., Nikolaev, I.B., Ouyang, Q., Qi, H.R., Qian, S., Rashid, K.H., Rosner, Ch, Ruan, X.D., Schoenning, K., Sheng, H.Y., Song, W.M., Sosio, S., Uman, I., Varner, G.S., Wang, B., Wang, B.L., Wang, K., Wang, L.S., Wang, M., Wang, W.P., Wang, Y., Wang, Y.D., Weber, T., Weidenkaff, P., Wolke, M., Xiao, Z.J., Xiu, Q.L., Xu, Q.J., Xu, Q.N., Xu, X.P., Yan, L., Yang, L., Yang, Y.X., Yuan, C.Z., Yuncu, A., Zhang, D.H., Zhang, J.J., Zhang, J.L., Zhang, X.Y., Zhang, Y.N., Zhao, G., Zhao, Lei, Zhu, K., Zhu, K.J., Zhu, S., Zhu, X.L., Zou, B.S.
Format: Artikel
Sprache:eng
Schlagworte:
Absolute branching fraction
BESIII
formula omitted
Semi-leptonic decay
Λc
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Beschreibung
Zusammenfassung:We report the first measurement of the absolute branching fraction for Λc+→Λμ+νμ. This measurement is based on a sample of e+e− annihilation data produced at a center-of-mass energy s=4.6 GeV, collected with the BESIII detector at the BEPCII storage rings. The sample corresponds to an integrated luminosity of 567 pb−1. The branching fraction is determined to be B(Λc+→Λμ+νμ)=(3.49±0.46(stat)±0.27(syst))%. In addition, we calculate the ratio B(Λc+→Λμ+νμ)/B(Λc+→Λe+νe) to be 0.96±0.16(stat)±0.04(syst).
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2017.01.047