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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2008, vol. 100, p. -

Observation of B0→pp̄K*0 with a Large K*0 Polarization

Chen J. H., Wang M. Z., Adachi I., Aihara H., Arinstein K., Aulchenko V., Aushev T., Bakich A. M., Balagura V., Barberio E., Bay A., Bedny I., Belous K., Bitenc U., Bondar A., Bozek A., Bračko M., Browder T. E., Chang M. C., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Cho I. S., Choi S. K., Choi Y., Dalseno J., Dash M., Drutskoy A., Eidelman S., Golob B., Ha H., Haba J., Hara T., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Joshi N. J., Kah D. H., Kaji H., Kapusta P., Katayama N., Kawasaki T., Kichimi H., Kim H. J., Kim S. K., Kim Y. J., Kinoshita K., Krokovny P., Kumar R., Kuo C. C., Kwon Y. J., Lee J. S., Lee M. J., Lee S. E., Lesiak T., Li J., Limosani A., Liu C., Liventsev D., Mandl F., Matyja A., McOnie S., Medvedeva T., Mitaroff W., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Ozaki H., Pakhlov P., Pakhlova G., Palka H., Park C. W.

Using a 492fb-1 data sample collected near the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider, we observe the decay B0→pp̄K*0 with a branching fraction of (1.18-0.25+0.29(stat)±0.11(syst))×10-6. We study the decay dynamics of B0→pp̄K*0 and compare with B+→pp̄K*+. The K*0 meson is found to be almost 100% polarized (with a fraction of (101±13±3)% in the helicity zero state), while the K*+ meson has a (32±17±9)% fraction in the helicity zero state. The direct CP asymmetries for B0→pp̄K*0 and B+→pp̄K*+ are measured to be -0.08±0.20±0.02 and -0.01±0.19±0.02, respectively. In addition, we report improved measurements of the branching fractions B(B+→pp̄K*+)=(3.38-0.60+0.73±0.39)×10-6 and B(B0→pp̄K0)=(2.51-0.29+0.35±0.21)×10-6, which supersede our previous measurements. © 2008 The American Physical Society.