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Measurement of the inclusive B0 s→ X+ℓ-ν semileptonic decay branching fraction

Abe K., Adachi I., Aihara H., Arinstein K., Aso T., Aulchenko V., Aushev T., Aziz T., Bahinipati S., M. Bakich A., Balagura V., Ban Y., Banerjee S., Barberio E., Bay A., Bedny I., Belous K., Bhardwaj V., Bitenc U., Blyth S., Bondar A., Bozek A., Bracko M., Brodzicka J., Browder T. E., Chang M. C., Chang P., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chiang C. C., Chistov R., Cho I. S., Choi S. K., Choi Y., Choi Y. K., Cole S., Dalseno J., Danilov M., Das A., Dash M., Dragic J., Drutskoy A., Eidelman S., Epifanov D., Fratina S., Fujii H., Fujikawa M., Gabyshev N., Garmash A., Go A., Gokhroo G., Goldenzweig P., Golob B., Grosse Perdekamp M., Guler H., Ha H., Haba J., Hara K., Hara T., Hasegawa Y., Hastings N. C., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Higuchi T., Hinz L., Hoedlmoser H., Hokuue T., Horii Y., Hoshi Y., Hoshina K., Hou S., Hou W. S., Hsiung Y. B., Hyun H. J., Igarashi Y., Iijima T., Ikado K., Inami K., Ishikawa A., Ishino H., Itoh R., Iwabuchi M., Iwasaki M., Iwasaki Y., Jacoby C., Joshi N. J., Kaga M., Kah D. H., Kaji H., Kajiwara S., Kakuno H.

Inclusive semileptonic B0 s → X+ℓ-ν decays are studied for the first time using a 23.6 fb-1 data sample collected on the (5S) resonance with the Belle detector at the KEKB asym-metric energy e +e- collider. These decays are identified by the means of a lepton accompa- nied by a same-sign D+s meson originating from the other B0 s in the event. The semileptonic branching fractions are measured in the electron and muon channels to be B(B0 s → X+e -ν) =(10.9 ± 1.0 ± 0.9)% and B(B0 s → X+μ-ν) = (9.2 ± 1.0 ± 0.8)%, respectively. Assuming an equalelectron and muon production rate in B 0 s decays, a combined fit yields an average leptonic branch- ing fraction B(B0 s → X+ℓ-ν) = (10.2 ± 0.8 ± 0.9)%.