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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2003, vol. 67, p. -

Measurement of the B0-B̄0 mixing rate with B0(B̄0)→D*∓π ± partial reconstruction

Zheng Y., Browder T. E., Abe K., Abe K., Abe R., Adachi I., Aihara H., Akatsu M., Asano Y., Aso T., Aushev T., Bakich A. M., Ban Y., Bay A., Behera P. K., Bondar A., Bozek A., Bračko M., Casey B. C K, Chao Y., Chen K. F., Cheon B. G., Chistov R., Choi Y., Choi Y. K., Danilov M., Eidelman S., Eiges V., Enari Y., Fukunaga C., Gabyshev N., Garmash A., Gershon T., Golob B., Hagner C., Handa F., Hara T., Hastings N. C., Hasuko K., Hazumi M., Heenan E. M., Higuchi I., Hinz L., Hokuue T., Hoshi Y., Hou W. S., Huang H. C., Igarashi Y., Iijima T., Inami K., Ishino H., Iwasaki H., Iwasaki M., Jang H. K., Kang J. H., Kang J. S., Kataoka S. U., Katayama N., Kawai H., Kawakami Y., Kawamura N., Kawasaki T., Kichimi H., Kim D. W., Kim H. J., Kim H. O., Kim Hyunwoo, Kim J. H., Kim S. K., Kinoshita K., Kobayashi S., Korpar S., Krokovny P., Kuzmin A., Kwon Y. J., Leder G., Lee S. H., Li J., Liventsev D., Lu R. S., MacNaughton J., Majumder G., Matsumoto S., Matsumoto T., Mitaroff W., Miyabayashi Y., Miyake H., Miyata H., Nagamine T., Nagasaka Y., Nakadaira T., Nakano E., Nakao M., Nakazawa H., Nam J. W., Natkaniec Z.

We report a measurement of the B0-B̄0 mixing parameter Δmd based on a 29.1 fb-1 sample of Y(4S) resonance decays collected by the Belle detector at the KEKB asymmetric e +e- collider. We use events with a partially reconstructed B0(B̄0)→D*mnplus;π ± candidate and where the flavor of the accompanying B meson is identified by the charge of the lepton from a B0(B̄ 0)→X∓ℓ±v decay. The proper-time difference between the two B mesons is determined from the distance between the two decay vertices. From a simultaneous fit to the proper-time distributions for the same-flavor (B0(B̄0), ℓ±) and opposite-flavor (B0(B̄ 0),ℓ∓) event samples, we measure the mass difference between the two mass eigenstates of the neutral B meson to be Δmd = (0.509 ± 0.017 (stat) ± 0.020 (syst)) ps-1. © 2003 The American Physical Society.