Showing papers by "Y. Ban published in 2002"
Journal Article•
TL;DR: The B meson decay modes B -->Dpp; and B-->D(*)pp; have been studied using 29.4 fb(-1) of data collected with the Belle detector at KEKB using the corresponding upper limits at 90% C.L. are presented.
Abstract: The B meson decay modes B → Dpp and B → D*pp have been studied using 29.4 fb - 1 of data collected with the Belle detector at KEKB. The B 0 → D 0 pp and B 0 → D* 0 pp decays have been observed for the first time with branching fractions B(B 0 → D 0 pp) = (1.18 ′ 0.15 ′ 0.16) X 10 - 4 and B(B 0 → D* 0 pp) = (1.20 + 0 . 3 3 - 0 . 2 9 ′ 0.21) X 10 - 4 . No signal has been found for the B + → D + pp and B + → D* + pp decay modes, and the corresponding upper limits at 90% C.L. are presented.
441 citations
Journal Article•
TL;DR: In this paper, the decay mode B γ → ppK γ was observed and the branching fraction for this decay was measured to be B(B γ ) = [4.3 + 1. 1 - 0. 9 (stat) ′ 0.5(syst)] X 10 - 6.
Abstract: We report the observation of the decay mode B γ → ppK γ based on an analysis of 29.4 fb - 1 of data collected by the Belle detector at KEKB. This is the first example of a b → s transition with baryons in the final state.The pp mass spectrum in this decay is inconsistent with phase space and is peaked at low mass. The branching fraction for this decay is measured to be B(B γ → ppK γ ) = [4.3 + 1 . 1 - 0 . 9 (stat) ′ 0.5(syst)] X 10 - 6 . We also report upper limits for the decays B 0 → ppK S and B γ → ppπ γ .
201 citations
01 Jan 2002
TL;DR: In this paper, an improved measurement of the standard model CP violation parameter sin 2phi(1) (also known as sin 2beta) based on a sample of 85x10(6) B (B) over bar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider is presented.
Abstract: We present an improved measurement of the standard model CP violation parameter sin 2phi(1) (also known as sin 2beta) based on a sample of 85x10(6) B (B) over bar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. One neutral B meson is reconstructed in a J/psiK(S)(0), psi(2S)K-S(0), chi(c1)K(S)(0), eta(c)K(S)(0), J/psiK*(0), or J/psiK(L)(0) CP-eigenstate decay channel and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time interval between the two B meson decay points, we obtain sin 2phi(1)=0.719+/-0.074(stat)+/-0.035(syst).
122 citations
TL;DR: In this article, the authors reported the first example of a decay with baryons in the final state, and the branching fraction for this decay was measured to be $B(B) = 0.
Abstract: We report the observation of the decay mode ${B}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}p\overline{p}{K}^{\ifmmode\pm\else\textpm\fi{}}$ based on an analysis of $29.4{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected by the Belle detector at KEKB. This is the first example of a $b\ensuremath{\rightarrow}s$ transition with baryons in the final state. The $p\overline{p}$ mass spectrum in this decay is inconsistent with phase space and is peaked at low mass. The branching fraction for this decay is measured to be $B({B}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}p\overline{p}{K}^{\ifmmode\pm\else\textpm\fi{}})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}[{4.3}_{\ensuremath{-}0.9}^{+1.1}(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.5(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$. We also report upper limits for the decays ${B}^{0}\ensuremath{\rightarrow}p\overline{p}{K}_{S}$ and ${B}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}p\overline{p}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$.
77 citations
Journal Article•
TL;DR: In this paper, the decay mode B γ → ppK γ was observed and the branching fraction for this decay was measured to be B(B γ ) = [4.3 + 1. 1 - 0. 9 (stat) ′ 0.5(syst)] X 10 - 6.
Abstract: We report the observation of the decay mode B γ → ppK γ based on an analysis of 29.4 fb - 1 of data collected by the Belle detector at KEKB. This is the first example of a b → s transition with baryons in the final state.The pp mass spectrum in this decay is inconsistent with phase space and is peaked at low mass. The branching fraction for this decay is measured to be B(B γ → ppK γ ) = [4.3 + 1 . 1 - 0 . 9 (stat) ′ 0.5(syst)] X 10 - 6 . We also report upper limits for the decays B 0 → ppK S and B γ → ppπ γ .
70 citations
TL;DR: In this paper, the authors studied the meson decay modes of the Belle detector using data collected with the KEKB detector at KEKB, and the corresponding upper limits at 90% and 90% C.L.
Abstract: The $B$ meson decay modes $B\ensuremath{\rightarrow}Dp\overline{p}$ and $B\ensuremath{\rightarrow}{D}^{*}p\overline{p}$ have been studied using $29.4\text{ }\mathrm{f}{\mathrm{b}}^{\mathrm{\ensuremath{-}}\mathrm{1}}$ of data collected with the Belle detector at KEKB. The ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{0}p\overline{p}$ and ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{*0}p\overline{p}$ decays have been observed for the first time with branching fractions $\mathcal{B}({\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{0}p\overline{p})=(1.18\ifmmode\pm\else\textpm\fi{}0.15\ifmmode\pm\else\textpm\fi{}0.16)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and $\mathcal{B}({\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{*0}p\overline{p})=({1.20}_{\ensuremath{-}0.29}^{+0.33}\ifmmode\pm\else\textpm\fi{}0.21)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. No signal has been found for the ${B}^{+}\ensuremath{\rightarrow}{D}^{+}p\overline{p}$ and ${B}^{+}\ensuremath{\rightarrow}{D}^{*+}p\overline{p}$ decay modes, and the corresponding upper limits at $90%$ C.L. are presented.
62 citations
TL;DR: In this article, the decay amplitudes of helicity states of the J/ψK ∗ system were determined from the full angular distribution of the final state particles in the transversity basis.
41 citations
TL;DR: In this paper, the branching fraction for the semileptonic B decay B 0 →D + l − ν, where l− can be either an electron or a muon, was measured.
38 citations
TL;DR: In this paper, the first observations of the Cabibbo-suppressed decays were made and the first evidence for the non-resonant decay was given for W-exchange diagrams attributed to exchange diagrams.
28 citations
27 citations
TL;DR: In this article, the first observation of a B meson decay that is not accessible by a direct spectator process was reported, with a branching fraction B(B(0]->D(+)(s)K-) = 4.6(+1.2)(-1.1)+/-1.3) x 10(-5).
Abstract: We report the first observation of a B meson decay that is not accessible by a direct spectator process. The channel B(0)-->D(+)(s)K- is found in a sample of 85 x 10(6) BB; events, collected with the Belle detector at KEKB, with a branching fraction B(B(0)-->D(+)(s)K-)=(4.6(+1.2)(-1.1)+/-1.3) x 10(-5). We also obtain evidence for the B0-->D(+)(s)pi(-) decay with branching fraction B(B0-->D(+)(s)pi(-))=(2.4(+1.0)(-0.8)+/-0.7) x 10(-5). This value may be used to extract a model-dependent value of |V(ub)|.
TL;DR: In this paper, a measurement of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |Vcb| using a 10.2 −1 data sample recorded at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric e+e− storage ring is presented.
TL;DR: In this article, the authors measured the oscillation frequency of B0-B 0 mixing using 29.1 Ã −1 −1 of data collected with the Belle detector at KEKB and obtained Δm d = (0.528±0.011) ps −1, where the first error is statistical and the second error is systematic.
TL;DR: In this article, the first observation of meson production in $B$ meson decays was reported, where the Belle detector at the KEKB collider was used to collect the data set.
Abstract: We report the first observation of ${\ensuremath{\chi}}_{c2}$ production in $B$ meson decays. We find an inclusive $B\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c2}X$ branching fraction of $({1.80}_{\ensuremath{-}0.28}^{+0.23}\ifmmode\pm\else\textpm\fi{}0.26)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$. The data set, collected with the Belle detector at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ collider, consists of $31.9\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events. We also present branching fractions and momentum spectra for both ${\ensuremath{\chi}}_{c1}$ and ${\ensuremath{\chi}}_{c2}$ production.
Journal Article•
TL;DR: In this article, the B 0 -B 0 mixing parameter Δm d was measured using neutral B meson pairs in a 29.1 fb -1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e + e - collider.
Abstract: We present a measurement of the B 0 -B 0 mixing parameter Δm d using neutral B meson pairs in a 29.1 fb - 1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e + e - collider.We exclusively reconstruct one neutral B meson in the semileptonic B 0 → D* - + v decay mode and identify the flavor of the accompanying B meson from its decay products. From the distribution of the time intervals between the two flavor-tagged B meson decay points, we obtain Δm d = (0.494 ′ 0.012 ′ 0.015) ps - 1 , where the first error is statistical and the second error is systematic.
Journal Article•
TL;DR: The first observation of Χ c 2 production in B meson decays was reported in this article, where the Belle detector at the KEKB e + e - collider was used to collect data from 31.9 X 10 6 BB events.
Abstract: We report the first observation of Χ c 2 production in B meson decays. We find an inclusive B → Χ c 2 X branching fraction of (1.80 + 0 . 2 3 - 0 . 2 8 ′ 0.26) X 10 - 3 . The data set, collected with the Belle detector at the KEKB e + e - collider, consists of 31.9 X 10 6 BB events. We also present branching fractions and momentum spectra for both Χ c 1 and Χ c 2 2 production.
TL;DR: The first observation of the decay B(B(0)->D(+/-)D(*-/+) with the Belle detector at the KEKB e(+)e(-) Collider operated at the Upsilon(4S) resonance was reported in this article.
Abstract: We report the first observation of the decay B(0)-->D(+/-)D(*-/+) with the Belle detector at the KEKB e(+)e(-) Collider operated at the Upsilon(4S) resonance. The sum of branching fractions B(B(0)-->D(+)D(*-))+B(B(0)-->D(-)D(*+)) is measured to be (1.17+/-0.26(+0.22)(-0.25))x10(-3) using the full reconstruction method where both charmed mesons from B0 decays are reconstructed. A consistent value [(1.48+/-0.38(+0.28)(-0.31))x10(-3)] is obtained using a partial reconstruction technique that uses only the slow pion from the D(*-)-->D(-0)pi(-) decay and a fully reconstructed D(+) to reconstruct the B(0).
01 Jan 2002
TL;DR: In this paper, the authors propose a method to solve the problem of how to find the optimal set of words for a given sentence in a sentence by using a set of hand-crafted rules.
Abstract: K. Abe,9 K. Abe,41 T. Abe,42 I. Adachi,9 H. Aihara,43 M. Akatsu,24 Y. Asano,48 T. Aso,47 V. Aulchenko,2 T. Aushev,14 A. M. Bakich,39 Y. Ban,35 E. Banas,29 S. Behari,9 P. K. Behera,49 A. Bondar,2 A. Bozek,29 M. Bracko,22,15 T. E. Browder,8 B. C. K. Casey,8 P. Chang,28 Y. Chao,28 B. G. Cheon,38 R. Chistov,14 S.-K. Choi,7 Y. Choi,38 L. Y. Dong,12 J. Dragic,23 A. Drutskoy,14 S. Eidelman,2 V. Eiges,14 C. W. Everton,23 F. Fang,8 H. Fujii,9 C. Fukunaga,45 M. Fukushima,11 N. Gabyshev,9 A. Garmash,2,9 T. Gershon,9 B. Golob,21,15 A. Gordon,23 K. Gotow,50 R. Guo,26 J. Haba,9 H. Hamasaki,9 K. Hanagaki,36 F. Handa,42 K. Hara,33 T. Hara,33 N. C. Hastings,23 H. Hayashii,25 M. Hazumi,9 E. M. Heenan,23 I. Higuchi,42 T. Higuchi,43 T. Hojo,33 T. Hokuue,24 Y. Hoshi,41 K. Hoshina,46 S. R. Hou,28 W.-S. Hou,28 H.-C. Huang,28 Y. Igarashi,9 T. Iijima,9 H. Ikeda,9 K. Inami,24 A. Ishikawa,24 H. Ishino,44 R. Itoh,9 H. Iwasaki,9 Y. Iwasaki,9 D. J. Jackson,33 H. K. Jang,37 J. H. Kang,52 J. S. Kang,17 P. Kapusta,29 N. Katayama,9 H. Kawai,3 H. Kawai,43 N. Kawamura,1 T. Kawasaki,31 H. Kichimi,9 D. W. Kim,38 Heejong Kim,52 H. J. Kim,52 H. O. Kim,38 Hyunwoo Kim,17 S. K. Kim,37 T. H. Kim,52 K. Kinoshita,5 H. Konishi,46 S. Korpar,22,15 P. Križan,21,15 P. Krokovny,2 R. Kulasiri,5 S. Kumar,34 A. Kuzmin,2 Y.-J. Kwon,52 J. S. Lange,6 G. Leder,13 S. H. Lee,37 A. Limosani,23 D. Liventsev,14 R.-S. Lu,28 J. MacNaughton,13 F. Mandl,13 D. Marlow,36 S. Matsumoto,4 T. Matsumoto,24 Y. Mikami,42 K. Miyabayashi,25 H. Miyake,33 H. Miyata,31 G. R. Moloney,23 G. F. Moorhead,23 S. Mori,48 T. Mori,4 T. Nagamine,42 Y. Nagasaka,10 Y. Nagashima,33 T. Nakadaira,43 E. Nakano,32 M. Nakao,9 J. W. Nam,38 Z. Natkaniec,29 K. Neichi,41 S. Nishida,18 O. Nitoh,46 S. Noguchi,25 T. Nozaki,9 S. Ogawa,40 F. Ohno,44 T. Ohshima,24 T. Okabe,24 S. Okuno,16 S. L. Olsen,8 W. Ostrowicz,29 H. Ozaki,9 P. Pakhlov,14 H. Palka,29 C. S. Park,37 C. W. Park,17 H. Park,19 K. S. Park,38 L. S. Peak,39 J.-P. Perroud,20 M. Peters,8 L. E. Piilonen,50 F. Ronga,20 N. Root,2 M. Rozanska,29 K. Rybicki,29 J. Ryuko,33 H. Sagawa,9 Y. Sakai,9 H. Sakamoto,18 M. Satapathy,49 A. Satpathy,9,5 O. Schneider,20 S. Schrenk,5 S. Semenov,14 K. Senyo,24 M. E. Sevior,23 H. Shibuya,40 J. B. Singh,34 S. Stanic,48 A. Sugi,24 A. Sugiyama,24 K. Sumisawa,9 T. Sumiyoshi,9 K. Suzuki,9 S. Suzuki,51 S. Y. Suzuki,9 S. K. Swain,8 T. Takahashi,32 F. Takasaki,9 M. Takita,33 K. Tamai,9 N. Tamura,31 J. Tanaka,43 M. Tanaka,9 G. N. Taylor,23 Y. Teramoto,32 M. Tomoto,9 T. Tomura,43 S. N. Tovey,23 K. Trabelsi,8 T. Tsuboyama,9 T. Tsukamoto,9 S. Uehara,9 K. Ueno,28 Y. Unno,3 S. Uno,9 Y. Ushiroda,9 K. E. Varvell,39 C. C. Wang,28 C. H. Wang,27 J. G. Wang,50 M.-Z. Wang,28 Y. Watanabe,44 E. Won,37 B. D. Yabsley,9 Y. Yamada,9 M. Yamaga,42 A. Yamaguchi,42 H. Yamamoto,42 Y. Yamashita,30 M. Yamauchi,9 M. Yokoyama,43 Y. Yuan,12 Y. Yusa,42 C. C. Zhang,12 J. Zhang,48 Y. Zheng,8 V. Zhilich,2 and D. Žontar48
TL;DR: In this paper, the authors presented a measurement of the mixing parameter of a neutral $B$ meson pair in a semileptonic environment using the Belle detector at the KEKB asymmetric energy collider.
Abstract: We present a measurement of the ${B}^{0}\mathrm{\text{\ensuremath{-}}}{\overline{B}}^{0}$ mixing parameter $\ensuremath{\Delta}{m}_{d}$ using neutral $B$ meson pairs in a $29.1\text{ }\mathrm{f}{\mathrm{b}}^{\mathrm{\ensuremath{-}}\mathrm{1}}$ data sample collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. We exclusively reconstruct one neutral $B$ meson in the semileptonic ${B}^{0}\ensuremath{\rightarrow}{D}^{*\ensuremath{-}}{\ensuremath{\ell}}^{+}\ensuremath{
u}$ decay mode and identify the flavor of the accompanying $B$ meson from its decay products. From the distribution of the time intervals between the two flavor-tagged $B$ meson decay points, we obtain $\ensuremath{\Delta}{m}_{d}=(0.494\ifmmode\pm\else\textpm\fi{}0.012\ifmmode\pm\else\textpm\fi{}0.015)\text{ }{\mathrm{p}\mathrm{s}}^{\ensuremath{-}1}$, where the first error is statistical and the second error is systematic.