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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2007, vol. 76, p. -

Measurement of branching fraction and time-dependent CP asymmetry parameters in B0→D*+D*-KS0 decays

Dalseno J., Adachi I., Aihara H., Aushev T., Bakich A. M., Balagura V., Bay A., Bitenc U., Bizjak I., Bozek A., Bračko M., Browder T. E., Chao Y., Chen A., Cheon B. G., Chistov R., Cho I. S., Choi Y., Choi Y. K., Danilov M., Dash M., Drutskoy A., Eidelman S., Go A., Ha H., Hayasaka K., Hazumi M., Heffernan D., Hokuue T., Hyun H. J., Inami K., Ishikawa A., Ishino H., Iwasaki M., Iwasaki Y., Joshi N. J., Kah D. H., Kang J. H., Kapusta P., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim Y. J., Kinoshita K., Križan P., Krokovny P., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lee J. S., Lee S. E., Lesiak T., Li J., Limosani A., Lin S. W., Liventsev D., Mandl F., Matsumoto T., McOnie S., Medvedeva T., Mitaroff W., Miyake H., Miyata H., Moloney G. R., Nakano E., Nakao M., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Onuki Y., Ostrowicz W., Ozaki H., Pakhlov P., Pakhlova G., Park C. W., Park H., Park K. S., Pestotnik R., Piilonen L. E., Sahoo H., Sakai Y., Schneider O., Schümann J., Seidl R., Sekiya A., Senyo K., Sevior M. E., Shapkin M., Shibuya H., Singh J. B.

We present a measurement of the branching fraction and time-dependent CP violation parameters for B0→D*+D*-KS0 decays. These results are obtained from a 414fb-1 data sample that contains 449×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain the branching fraction, B(B0→D*+D*-KS0)=[3.4±0.4(stat)±0.7(syst)] ×10-3, which is in agreement with the current world average. We also obtain an upper limit on the product branching fraction for a possible two-body decay, B(B0→Ds1+(2536)D*-)B(Ds1+(2536)→D*+KS0)<7. 1×10-4 (90% CL). In the traditional 2-parameter time-dependent CP analysis, we measure the CP violation parameters, ACP=-0.01-0.28+0.28(stat) ±0.09(syst), Dsin 2 1=0.06-0.44+0.45(stat)±0.06(syst). No evidence for either mixing-induced or direct CP violation is found. In a 3-parameter fit sensitive to cos 2 1 performed in the half-Dalitz spaces, s-≤s+ and s->s+, where s± m2(D*±KS0), we extract the CP violation parameters, Jc/J0=0.60-0.28+0.25(stat)±0.08(syst), 2Js1/J0sin 2 1=-0.17-0.42+0.42(stat)±0.09(syst), 2Js2/J0cos 2 1=-0.23-0.41+0.43(stat) ±0.13(syst). A large value of Jc/J0 would indicate a significant resonant contribution from a broad unknown Ds**+ state. Although the sign of the factor, 2Js2/J0, can be deduced from theory, no conclusion can be drawn regarding the sign of cos 2 1 given the errors. © 2007 The American Physical Society.