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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2008, vol. 78, p. -

Measurement of the moments of the photon energy spectrum in B→Xsγ decays and determination of |Vcb| and mb at Belle

Schwanda C., Urquijo P., Barberio E., Limosani A., Adachi I., Aihara H., Arinstein K., Aushev T., Bahinipati S., Bakich A. M., Balagura V., Bedny I., Belous K., Bitenc U., Bondar A., Bozek A., Bračko M., Chang M. C., Chen A., Chen W. T., Cheon B. G., Chistov R., Cho I. S., 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., Hyun H. J., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kah D. H., Kang J. H., Kapusta P., Katayama N., Kichimi H., Kim H. J., Kim Y. J., Kinoshita K., Korpar S., Kozakai Y., Križan P., Krokovny P., Kumar R., Kuo C. C., Kuroki Y., Kuzmin A., Kwon Y. J., Lee J. S., Lee M. J., Lee S. E., Lesiak T., Li J., Liu C., Liventsev D., Mandl F., Matyja A., McOnie S., Medvedeva T., Mitaroff W., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Moloney G. R., Nakano E., Nakao M., Natkaniec Z., Nishida S., Nitoh O., Noguchi S., Nozaki T., Ogawa S., Ohshima T., Okuno S., Pakhlov P., Pakhlova G., Palka H., Park C. W., Park H., Peak L. S.

Using the previous Belle measurement of the inclusive photon energy in B→Xsγ decays, we determine the first and second moments of this spectrum for minimum photon energies in the B meson rest frame ranging from 1.8 to 2.3 GeV. Combining these measurements with recent Belle data on the lepton energy and hadronic mass moments in B→Xcℓν decays, we perform fits to theoretical expressions derived in the 1S and kinetic mass schemes and extract the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element Vcb, the b-quark mass, and other nonperturbative parameters. In the 1S scheme analysis we find |Vcb|=(41.56±0.68(fit)±0.08(τB))×10-3 and mb1S=(4.723±0.055)GeV. In the kinetic scheme, we obtain |Vcb|=(41.58±0.69(fit)±0.08(τB)±0.58(th))×10-3 and mbkin=(4.543±0.075)GeV. © 2008 The American Physical Society.