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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2002, vol. 538, p. 11-20

Measurements of branching fractions and decay amplitudes in B → J / ψ K* decays

Abe K., Abe K., Abe T., Adachi I., Ahn B. S., Aihara H., Akatsu M., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Ban Y., Banas E., Bay A., Behera P. K., Bondar A., Bozek A., Browder T. E., Casey B. C K, Chao Y., Cheon B. G., Chistov R., Choig S. K., Choi Y., Danilov M., Dong L. Y., Eidelman S., Eiges V., Enari Y., Fang F., Fukunaga C., Gershon T., Gotow K., Guo R., Haba J., Hanagaki K., Hara T., Hayashii H., Hazumi M., Heenan E. M., Higuchi I., Higuchi T., Hokuue T., Hoshi Y., Hou S. R., Hou W. S., Huang H. C., Igaki T., Iijima T., Inami K., Ishikawa A., Ishino H., Itoh R., Iwamoto M., Iwasaki H., Iwasaki Y., Jalocha P., Kang J. H., Kang J. S., Kapusta P., Kataoka S. U., Katayama N., Kawai H., Kawakami Y., Kawamura N., Kawasaki T., Kichimi H., Kim D. W., Kim H., Kim H. J., Kim H. O., Kim H., Kinoshita K., Korpar S., Križan P., Krokovny P., Kulasiri R., Kumar S., Kwon Y. J., Lange J. S., Leder G., Lee S. H., Liventsev D., MacNaughton J., Majumder G., Matsuishi T., Matsumoto S., Matsumoto T., Mitaroff W., Miyabayashi K., Miyabayashi Y., Miyake H., Miyata H., Moloney G. R., Mori S.

The branching fractions and the decay amplitudes of B → J / ψ K* decays are measured in a 29.4 fb-1 data sample collected with the Belle detector at the KEKB electron-positron collider. The decay amplitudes of helicity states of the J / ψ K* system are determined from the full angular distribution of the final state particles in the transversity basis. The branching fractions are measured to be (1.29 ± 0.05 ± 0.13) × 10-3 for neutral mesons and (1.28 ± 0.07 ± 0.14) × 10-3 for charged mesons. The measured longitudinal and transverse (perpendicular to the transversity plane) amplitudes are |A0|2 = 0.62 ± 0.02 ± 0.03 and |A⊥|2 = 0.19 ± 0.02 ± 0.03, respectively. The value of |A⊥|2 shows that the CP even component dominates in the B0 → J/ψ K*0(KSπ0) decay. © 2002 Elsevier Science B.V. All rights reserved.