First Measurement of the Form Factors in D s + → K 0 e + ν e and D s + → K 0 e + ν e Decays

We address new measurements of Cabibbo-suppressed semileptonic D$+\atop{s}$ decays using 3.19 fb-1 of e+e- annihilation data sample collected at a center-of-mass energy of 4.178 GeV with the BESIII detector at the BEPCII collider. Our results include branching fractions $\mathcal{B(D^+_s→K^0e^+v_e)}...

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Veröffentlicht in:	Physical review letters 2019-02, Vol.122 (6), Article 061801
Hauptverfasser:	Ablikim, M., Achasov, M. N., Ahmed, S., Albrecht, M., Alekseev, M., Amoroso, A., An, F. F., An, Q., Bai, Y., Bakina, O., Baldini Ferroli, R., Ban, Y., Begzsuren, K., Bennett, D. W., Bennett, J. V., Berger, N., Bertani, M., Bettoni, D., Bianchi, F., Boger, E., Boyko, I., Briere, R. A., Cai, H., Cai, X., Calcaterra, A., Cao, G. F., Cetin, S. A., Chai, J., Chang, J. F., Chang, W. L., Chelkov, G., Chen, G., Chen, H. S., Chen, J. C., Chen, M. L., Chen, P. L., Chen, S. J., Chen, X. R., Chen, Y. B., Cheng, W., Chu, X. K., Cibinetto, G., Cossio, F., Dai, H. L., Dai, J. P., Dbeyssi, A., 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., Dou, Z. L., Du, S. X., Duan, P. F., Fang, J., Fang, S. S., Fang, Y., Farinelli, R., Fava, L., Fegan, S., Feldbauer, F., Felici, G., Feng, C. Q., Fioravanti, E., Fritsch, M., Fu, C. D., Gao, Q., Gao, X. L., Gao, Y., Gao, Y. G., Gao, Z., Garillon, B., Garzia, I., Gilman, A., Goetzen, K., Gong, L., Gong, W. X., Gradl, W., Greco, M., Gu, L. M., Gu, M. H., Gu, Y. T., Guo, A. Q., Guo, L. B., Guo, R. P., Guo, Y. P., Guskov, A., Haddadi, Z., Han, S., Hao, X. Q., Harris, F. A., He, K. L., He, X. Q., Heinsius, F. H.
Format:	Artikel
Sprache:	eng
Schlagworte:	NUCLEAR PHYSICS AND RADIATION PHYSICS
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Zusammenfassung:	We address new measurements of Cabibbo-suppressed semileptonic D$+\atop{s}$ decays using 3.19 fb-1 of e+e- annihilation data sample collected at a center-of-mass energy of 4.178 GeV with the BESIII detector at the BEPCII collider. Our results include branching fractions $\mathcal{B(D^+_s→K^0e^+v_e)}$ = (3.25 ± 0.38(stat.) ± 0.16(syst.))×10-3 and $\mathcal{B(D^+_s→K^0e^+v_e)}$ = (2.37±0.26(stat.)±0.20(syst.))×10-3 which are much improved relative to previous measurements, and the first measurements of the hadronic form-factor parameters for these decays. For D$+\atop{s}$→K0e+ve, we obtain f+(0) = 0.720 ± 0.084(stat.) ± 0.013(syst.), and for D$+\atop{s}$→K0e+ve, we find form-factor ratios rV = V (0)/A1(0) = 1.67 ± 0.34(stat.) ± 0.16(syst.) and r2 = A2(0)/A1(0) = 0.77 ± 0.28(stat.) ± 0.07(syst.).
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.122.061801