Observation of the decays χcJ → $$ {\mathrm{nK}}_{\mathrm{S}}^0\overline{\Lambda} $$ + c.c

• Published in: The journal of high energy physics Vol. 2021; no. 11
• Main Authors: Ablikim, M., Achasov, M. N., Adlarson, P., Ahmed, S., Albrecht, M., Aliberti, R., Amoroso, A., An, M. R., An, Q., Bai, X. H., Bai, Y., Bakina, O., Baldini Ferroli, R., Balossino, I., Ban, Y., Begzsuren, K., Berger, N., Bertani, M., Bettoni, D., Bianchi, F., Bloms, J., Bortone, A., Boyko, I., Briere, R. A., Cai, H., Cai, X., Calcaterra, A., Cao, G. F., Cao, N., Cetin, S. A., Chang, J. F., Chang, W. L., Chelkov, G., Chen, D. Y., Chen, G., Chen, H. S., Chen, M. L., Chen, S. J., Chen, X. R., Chen, Y. B., Chen, Z. J., Cheng, W. S., Cibinetto, G., Cossio, F., Cui, X. F., Dai, H. L., Dai, J. P., Dai, X. C., Dbeyssi, A., de Boer, R. E., Dedovich, D., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., De Mori, F., Ding, Y., Dong, C., Dong, J., Dong, L. Y., Dong, M. Y., Dong, X., Du, S. X., Fan, Y. L., Fang, J., Fang, S. S., Fang, Y., Farinelli, R., Fava, L., Feldbauer, F., Felici, G., Feng, C. Q., Feng, J. H., Fritsch, M., Fu, C. D., Gao, Y., Gao, Y. G., Garzia, I., Ge, P. T., Geng, C., Gersabeck, E. M., Gilman, A., Goetzen, K., Gong, L., Gong, W. X., Gradl, W., Greco, M., Gu, L. M., Gu, M. H., Gu, Y. T., Guan, C. Y., Guo, A. Q., Guo, L. B., Guo, R. P., Guo, Y. P., Guskov, A., Han, T. T., Han, W. Y., Hao, X. Q., Harris, F. A.
• Format: Journal Article
• Language: English
• Published: 01-11-2021
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP11(2021)217

A
bstract
By analyzing 4
.
48 × 10
8
ψ
(3686) events collected with the BESIII detector, we observe the decays
χ
cJ
→
$$ {nK}_S^0\overline{\Lambda} $$
nK
S
0
Λ
¯
+ c
.
c
.
(
J
= 0, 1, 2) for the first time, via the radiative transition
ψ
(3686) →
γχ
cJ
. The branching fractions are determined to be (6
.
65 ± 0
.
26
stat
± 0
.
41
syst
) × 10
−
4
, (1
.
66 ± 0
.
12
stat
± 0
.
12
syst
) × 10
−
4
, and (3
.
58 ± 0
.
16
stat
± 0
.
23
syst
) × 10
−
4
for
J
= 0, 1, and 2, respectively.