Bizjak I, Abe K, Abe K, Aihara H, Asano Y, Bahinipati S, Bakich A M, Ban Y, Barberio E, Barbero M, Bay A, Bitenc U, Blyth S, Bondar A, Bozek A, Bracko M, Brodzicka J, Browder T E, Chao Y, Chen A, Chen W T, Cheon B G, Chistov R, Choi S-K, Choi Y, Choi Y K, Chuvikov A, Cole S, Dalseno J, Danilov M, Dash M, Dong L Y, Drutskoy A, Eidelman S, Enari Y, Fang F, Fratina S, Gabyshev N, Garmash A, Gershon T, Gokhroo G, Golob B, Gorisek A, Haba J, Hara T, Hayashii H, Hazumi M, Hinz L, Hokuue T, Hoshi Y, Hou S, Hou W-S, Iijima T, Imoto A, Inami K, Ishikawa A, Itoh R, Iwasaki M, Iwasaki Y, Kang J H, Kang J S, Kapusta P, Katayama N, Kawai H, Kawasaki T, Khan H R, Kichimi H, Kim H J, Kim S M, Kinoshita K, Korpar S, Krizan P, Krokovny P, Kulasiri R, Kumar S, Kuo C C, Kuzmin A, Kwon Y-J, Leder G, Lee S E, Lesiak T, Li J, Limosani A, Lin S-W, Liventsev D, MacNaughton J, Majumder G, Mandl F, Matsumoto T, Matyja A, Mikami Y, Mitaroff W, Miyabayashi K, Miyake H, Miyata H, Mizuk R, Nagamine T, Nagasaka Y, Nakamura I, Nakano E, Nakao M, Natkaniec Z, Nishida S, Nitoh O, Nozaki T, Ogawa S, Ohshima T, Okabe T, Okuno S, Olsen S L, Onuki Y, Ostrowicz W, Pakhlov P, Park H, Parslow N, Peak L S, Pestotnik R, Piilonen L E, Rozanska M, Sagawa H, Sakai Y, Sato N, Schietinger T, Schneider O, Schönmeier P, Schwanda C, Senyo K, Sevior M E, Shibuya H, Shwartz B, Sidorov V, Somov A, Soni N, Stamen R, Stanic S, Staric M, Sumiyoshi T, Suzuki S, Suzuki S Y, Tajima O, Takasaki F, Tamai K, Tamura N, Tanaka M, Teramoto Y, Tian X C, Tsuboyama T, Tsukamoto T, Uehara S, Uglov T, Ueno K, Uno S, Urquijo P, Varner G, Varvell K E, Villa S, Wang C C, Wang C H, Watanabe Y, Xie Q L, Yabsley B D, Yamaguchi A, Yamashita Y, Yamauchi M, Yang Heyoung, Zhang L M, Zhang Z P, Zhilich V, Zontar D
J. Stefan Institute, Ljubljana.
Phys Rev Lett. 2005 Dec 9;95(24):241801. doi: 10.1103/PhysRevLett.95.241801. Epub 2005 Dec 8.
We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element /Vub/, based on 253 fb(-1) of data collected by the Belle detector at the KEKB e+ e- asymmetric collider. Events are tagged by fully reconstructing one of the B mesons, produced in pairs from Gamma(4S). The signal for b --> u semileptonic decay is distinguished from the b --> c background using the hadronic mass Mx, the leptonic invariant mass squared q2 and the variable P+ [triple bond] Ex - /px/. The results are obtained for events with p(l)* > or = 1 GeV/c, in three kinematic regions (1) Mx < 1.7 GeV/c2, (2) Mx < 1.7 GeV/c2 combined with q2 > 8 GeV2/c2, and by (3) P+ < 0.66 GeV/c. The matrix element /Vub/ is found to be (4.09 +/- 0.19 +/- 0.20(+0.14) -0.15 +/- 0.18) x 10(-3), where the errors are statistical, systematic including Monte Carlo modeling, theoretical, and from shape function parameter determination, respectively.
