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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015, vol. 92, 11, p. -

Study of decay dynamics and CP asymmetry in D+ → KL0 e+νe decay

Ablikim M., Achasov M. N., Ai X. C., Albayrak O., Albrecht M., Ambrose D. J., Amoroso A., An F. F., An Q., Bai J. Z., Ferroli R. Baldini, Ban Y., Bennett D. W., Bennett J. V., Bertani M., Bettoni D., Bian J. M., Bianchi F., Boger E., Boyko I., Briere R. A., Cai H., Cai X., Cakir O., Calcaterra A., Cao G. F., Cetin S. A., Chang J. F., Chelkov G., Chen G., Chen H. S., Chen H. Y., Chen J. C., Chen M. L., Chen S., Chen S. J., Chen X., Chen X. R., Chen Y. B., Cheng H. P., Chu X. K., Cibinetto G., 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., Du S. X., Duan P. F., Fan J. Z., Fang J., Fang S. S., Fang X., Fang Y., Fava L., Feldbauer F., Felici G., Feng C. Q.

© 2015 American Physical Society. Using 2.92 fb-1 of electron-positron annihilation data collected at s=3.773 GeV with the BESIII detector, we obtain the first measurements of the absolute branching fraction B(D+→KL0e+νe)=(4.481±0.027(stat)±0.103(sys))% and the CP asymmetry ACPD+→KL0e+νe=(-0.59±0.60(stat)±1.48(sys))%. From the D+→KL0e+νe differential decay rate distribution, the product of the hadronic form factor and the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element, f+K(0)|Vcs|, is determined to be 0.728±0.006(stat)±0.011(sys). Using |Vcs| from the SM constrained fit with the measured f+K(0)|Vcs|, f+K(0)=0.748±0.007(stat)±0.012(sys) is obtained, and utilizing the unquenched Lattice QCD (LQCD) calculation for f+K(0), |Vcs|=0.975±0.008(stat)±0.015(sys)±0.025(LQCD).