Measurement Of Vertical Bar V-Ub Vertical Bar From Inclusive Charmless Semileptonic B Decays

Urquijo P,Barberio E, Adachi I,Aihara H,Arinstein K,Bakich A M, Belous K,Bhardwaj V,Bischofberger M, Bozek A,Bracko M,Browder T E,Chao Y, Chen A,Cheon B G,Chistov R,Cho I-S, Choi Y,Dalseno J,Das A,Dash M,Dungel W, Eidelman S,Gabyshev N, Goldenzweig P,Golob B,Ha H,Haba J, Hayashii H,Horii Y,Hoshi Y,Hou W-S,Hsiung Y B,Hyun H J, Iijima T,Inami K,Ishikawa A,Itoh R,Iwasaki M,Kah D H, Kang J H, Katayama N,Kawai H, Kawasaki T,Kim H O,Kim J H,Kim S K,Kim Y I,Kim Y J,Kinoshita K, Ko B R,Kreps M,Krizan P,Krokovny P, Kuhr T,Kuzmin A,Kwon Y-J,Kyeong S-H,Lee M J, Lee S E,Lee S-H,Lesiak T,Li J, Limosani A, Liu C,Liventsev D,Louvot R,Mandl F,Matyja A,McOnie S,Miyata H, Miyazaki Y,Mizuk R, Mori T,Nagasaka Y,Nakano E, Nakao M,Natkaniec Z,Nishida S,Nishimura K,Nitoh O,Nozaki T, Ogawa S, Ohshima T,Okuno S,Ostrowicz W,Ozaki H,Pakhlova G,Park C W,Park H K,Park K S,Pestotnik R,Piilonen L E,Sahoo H,Sakai Y,Schneider O,Schwanda C, Seidl R,Senyo K, Sevior M E,Shapkin M,Shiu J-G,Shwartz B, Singh J B,Stanic S,Staric M,Sumisawa K, Taylor G N,Teramoto Y,Trabelsi K, Uehara S,Uglov T, Unno Y,Uno S, Varner G, Varvell K E, Vervink K, Wang C H,Wang M-Z, Wang P, Watanabe Y,Wedd R,Won E, Yabsley B D,Yamashita Y, Zhang Z P,Zhilich V, Zhulanov V,Zivko T, Zupanc A,Zyukova O, Null Null

PHYSICAL REVIEW LETTERS（2010）

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摘要

We present the partial branching fraction for inclusive charmless semileptonic B decays and the corresponding value of the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-ub vertical bar, using a multivariate analysis method to access similar to 90% of the B -> X(u)l nu phase space. This approach dramatically reduces the theoretical uncertainties from the b-quark mass and nonperturbative QCD compared to all previous inclusive measurements. The results are based on a sample of 657 X 10(6) B (B) over bar pairs collected with the Belle detector. We find that Delta B(B -> X(u)l nu; p(l)*(B) > 1.0 GeV/c) = 1.963X(1 +/- 0.088(stat) +/- 0.081(syst)) X 10(-3). Corresponding values of vertical bar V-ub vertical bar are extracted using several theoretical calculations.

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