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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2004, vol. 92, p. 101801-1

Measurement of |Vub| Using Inclusive B → X uℓν Decays with a Novel Xu-Reconstruction Method

Kakuno H., Abe K., Adachi I., Aihara H., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Ban Y., Banerjee S., Bizjak I., Bondar A., Bozek A., Bračko M., Browder T. E., Chao Y., Cheon B. G., Chistov R., Choi S. K., Choi Y., Choi Y. K., Chuvikov A., Cole S., Danilov M., Dash M., Dong L. Y., Dragic J., Drutskoy A., Eidelman S., Eiges V., Gabyshev N., Garmash A., Gershon T., Gokhroo G., Golob B., Haba J., Hagner C., Hara T., Hazumi M., Higuchi I., Hinz L., Hokuue T., Hoshi Y., Hou W. S., Huang H. C., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki H., Iwasaki Y., Kang J. H., Kang J. S., Kapusta P., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim J. H., Kinoshita K., Korpar S., Križan P., Krokovny P., Kwon Y. J., Leder G., Lee S. H., Lesiak T., Li J., Limosani A., Lin S. W., MacNaughton J., Mandl F., Matyja A., Mikami Y., Mitaroff W., Miyabayashi K., Miyata H., Moloney G. R., Mori T., Nagamine T., Nagasaka Y., Nakadaira T., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Nozaki T., Ogawa S., Ohshima T., Okuno S., Olsen S. L.

The measurement of an inclusive partial branching fraction for charmless semileptonic B decay and the extraction of |Vub| was discussed. The candidates for B → Xulv were identified with a Xu reconstruction method based on neutrino reconstruction.It was found that the result of |Vub| = (4.66 ± 0.760 × 10-3 was consistent with the previous inclusive measurements. Analysis shows that the error from the cluster finding efficiency was estimated by reducing the photon-finding efficiency within its uncertainity.