Showing papers by "J. Haba published in 2012"
TL;DR: In this paper, the pion transition form factor, F(Q(2)), is measured for the kinematical region 4 GeV2 <= Q(2) <= 40 GeV 2, where -Q 2 is the invariant-mass squared of a virtual photon.
Abstract: We report a measurement of the process gamma gamma* -> pi(0) with a 759 fb(-1) data sample recorded with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The pion transition form factor, F(Q(2)), is measured for the kinematical region 4 GeV2 <= Q(2) <= 40 GeV2, where -Q(2) is the invariant-mass squared of a virtual photon. The measured values of Q(2)vertical bar F(Q(2))vertical bar agree well with the previous measurements below Q(2) similar or equal to 9 GeV2 but do not exhibit the rapid growth in the higher Q(2) region seen in another recent measurement, which exceeds the asymptotic QCD expectation by as much as 50%.
190 citations
TL;DR: In this paper, a precise measurement of the CP violation parameter sin2 phi(1) and the direct CP violation parameters A(f) using the final data sample of 772 x 10(6) B (B) over bar pairs collected at the gamma(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+) e(-) collider is presented.
Abstract: We present a precise measurement of the CP violation parameter sin2 phi(1) and the direct CP violation parameter A(f) using the final data sample of 772 x 10(6) B (B) over bar pairs collected at the gamma(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+) e(-) collider. One neutral B meson is reconstructed in a J/psi K-S(0), psi(2S)K-S(0), chi K-c1(S)0, or J/psi K-L(0) CP eigenstate an(its flavor is identified from the decay products of the accompanying B meson. From the distribution of proper-time intervals between the two B decays, we obtain the following CP violation parameters: sin2 phi(1) 0.667 +/- 0.023(stat) +/- 0.012(syst) and A(f) = 0.006 +/- 0.016(stat) +/- 0.012(syst).
100 citations
TL;DR: In this article, a new sensitive search for C P T violation was reported, which includes improved measurements of the C p T-violating parameter z and the total decay-width difference normalized to the averaged width delta(d) delta(D) of the two B-d mass eigenstates.
Abstract: We report a new sensitive search for C P T violation, which includes improved measurements of the C P T-violating parameter z and the total decay-width difference normalized to the averaged width delta(d) delta(d) of the two B-d mass eigenstates . The results are based on a data sample of 535 x 10(6) B B pairs collected at the Epsilon(4 S) resonance with the Belle detector at the KEKB asymmetric-energy e(+) e(-) collider. We obtain Re (z) = [+1.9 +/- 3.7 (stat) +/- 3.3 (syst)] x 10(>-2), qm (z) = [-5.7 +/- 3.3 (stat) +/- 3.3 (syst)] x 10(-3), and delta(d) / delta(d) = [-1.7 +/- 1.8 (stat) +/- 1.1 (syst)] x 10(-2), all of which are consistent with zero. This is the most precise single measurement of these parameters in the neutral B-meson system to date.
46 citations
Posted Content•
TL;DR: In this article, the authors reported preliminary results on the analysis of the three-body Y(10860)=> B barB pi, Y( 10860) => (B barB* + c.c.c.) pi and Y (10860]=> B* barB*) pi decays as intermediate channels.
Abstract: We report preliminary results on the analysis of the three-body Y(10860)=> B barB pi, Y(10860) => (B barB* + c.c.) pi and Y(10860)=> B* barB* pi decays including an observation of the Y(10860)=> Zb(10610)+- pi-+ => [B barB*+c.c]+- pi-+ and Y(10860)=> Zb(10650)+- pi-+ => [B* barB*]+- pi-+ decays as intermediate channels. We measure branching fractions of the three-body decays to be Br(Y(10860)=> [B barB*+c.c.]+- pi-+)=(28.3+-2.9+-4.6)x10^{-3} and Br(Y(10860)=> [B* barB*]+- pi-+)=(14.1+-1.9+-2.4)x10^{-3} and set 90% C.L. upper limit Br(Y(10860)=> [B barB]+- pi-+) Y(nS)pi+pi-, n=1,2,3 decays and the analysis of the internal structure of the three-body Y(10860)=>hb(mP)pi+pi-, m=1,2 decays. The results are based on a 121.4 1/fb data sample collected with the Belle detector at a center-of-mass energy near the Y(10860).
38 citations
TL;DR: In this paper, the authors observed evidence for CP violation in the decay D+ → K(S)π+ using a data sample with an integrated luminosity of 977 Ã 0 Ã Ã 1 ) collected by the Belle detector at the KEKB e+ e- asymmetric energy collider.
Abstract: We observe evidence for CP violation in the decay D+ → K(S)(0)π+ using a data sample with an integrated luminosity of 977 fb(-1) collected by the Belle detector at the KEKB e+ e- asymmetric-energy collider. The CP asymmetry in the decay is measured to be (-0.363±0.094±0.067)%, which is 3.2 standard deviations away from zero, and is consistent with the expected CP violation due to the neutral kaon in the final state.
33 citations
TL;DR: In this paper, the authors measured the branching fractions of B-0 -> J/psi eta((')) decays with the complete Belle data sample of 772 x 10(6) B (B) over bar events collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider.
Abstract: We measure the branching fractions of B-0 -> J/psi eta((')) decays with the complete Belle data sample of 772 x 10(6) B (B) over bar events collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The results for the branching fractions are: B(B-0 -> J/psi eta) = (12.3 +/-(1.8)(1.7)+/- 0.7) x 10(-6) and B(B-0 -> J/psi eta') < 7.4 x 10(-6) at 90% confidence level. The eta-eta' mixing angle is constrained to be less than 42.2 degrees at 90% confidence level.
27 citations
TL;DR: In this paper, the first observations of B-s(0)-> J/psi eta were reported from 121.4 fb(-1) of data collected at the Gamma(5S) resonance with the Belle detector at the KEKB e(+)e(-) collider.
Abstract: We report first observations of B-s(0) -> J/psi eta and B-s(0) -> J/psi eta'. The results are obtained from 121.4 fb(-1) of data collected at the Gamma(5S) resonance with the Belle detector at the KEKB e(+)e(-) collider. We obtain the branching fractions B(B-s(0)-> J/psi eta')=[5.10 +/- 0.50(stat)+/- 0.25(syst)(-0.79)(+1.14)(N-Bs(*)(B) over bars(*)] X 10(-4,) B(B-s(0)-> J/psi eta') = [3.71 +/- 0.61(stat)+/-(+0.83)(-0.57)(N-Bs(*)(B) over bars(*)] X 10(-4). The ratio of the two branching fractions is measured to be B(B-s -> J/psi eta')/B(B-s -> J/psi eta) = 0.73 +/- 0.14(stat) +/- 0.02(syst).
23 citations
TL;DR: In this paper, the difference between the $CP$-violating asymmetries for the Cabibbo-suppressed decays was measured, and no evidence for direct violation was found.
Abstract: We search for $CP$ violation in Cabibbo-suppressed charged $D$ meson decays by measuring the difference between the $CP$-violating asymmetries for the Cabibbo-suppressed decays ${D}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ and the Cabibbo-favored decays ${D}_{s}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ in the ${K}^{+}{K}^{\ensuremath{-}}$ mass region of the $\ensuremath{\phi}$ resonance. Using $955\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected with the Belle detector, we obtain ${A}_{CP}^{{D}^{+}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{+}}=(+0.51\ifmmode\pm\else\textpm\fi{}0.28\ifmmode\pm\else\textpm\fi{}0.05)%$. The measurement improves the sensitivity of previous searches by more than a factor of 5. We find no evidence for direct $CP$ violation.
23 citations
Posted Content•
TL;DR: In this paper, the first observation of Y(5S) → Y(1S) pi0 pi0 decays at the KEKB asymmetric-energy e+e-collider was reported.
Abstract: We report the first observation of Y(5S) -> Y(1,2S) pi0 pi0 decays. Evidence for the Zb0(10610) with 4.9sigma significance is found in a Dalitz plot analysis of Y(5S) -> Y(2S) pi0 pi0 decays. The results are obtained with a 121.4 fb^-1 data sample collected with the Belle detector at the Y(5S) resonance at the KEKB asymmetric-energy e+e- collider.
20 citations
University of Tokyo1, Novosibirsk State University2, Pacific Northwest National Laboratory3, University of Sydney4, École Polytechnique Fédérale de Lausanne5, Panjab University, Chandigarh6, Indian Institute of Technology Guwahati7, Polish Academy of Sciences8, University of Maribor9, National Central University10, National Taiwan University11, Hanyang University12, Yonsei University13, Korea Institute of Science and Technology Information14, Sungkyunkwan University15, Charles University in Prague16, Tata Institute of Fundamental Research17, University of Ljubljana18, Nagoya University19, Tohoku University20, Tohoku Gakuin University21, Nara Women's University22, University of Melbourne23, Niigata University24, Max Planck Society25, Kyungpook National University26, Korea University27, University of Cincinnati28, Tokyo Institute of Technology29, Tokyo Metropolitan University30, University of Giessen31, Virginia Tech32, Indian Institute of Technology Madras33, University of Science and Technology of China34, Osaka City University35, Tokyo University of Agriculture and Technology36, Kanagawa University37, Seoul National University38, Karlsruhe Institute of Technology39, Austrian Academy of Sciences40, University of Nova Gorica41, Gifu University42, University of Bonn43, Indiana University44, National United University45
TL;DR: In this paper, the difference between CP-violating asymmetries for the Cabibbo-suppressed decays D(±)→K(+)K(-)π(±), and the Cabiba-favoured decays was measured.
Abstract: We search for CP violation in Cabibbo-suppressed charged D meson decays by measuring the difference between the CP-violating asymmetries for the Cabibbo-suppressed decays D(±)→K(+)K(-)π(±) and the Cabibbo-favored decays D(s)(±)→K(+)K(-)π(±) in the K(+)K(-) mass region of the ϕ resonance. Using 955 fb(-1) of data collected with the Belle detector, we obtain A(CP)(D+→ϕπ+)=(+0.51±0.28±0.05)%. The measurement improves the sensitivity of previous searches by more than a factor of 5. We find no evidence for direct CP violation.
20 citations
TL;DR: In this paper, the authors report measurements of branching fractions and time-dependent $CP$ asymmetries in a data sample that contains pairs collected at the Belle detector at the KEKB asymmetric-energy collider.
Abstract: We report measurements of branching fractions and time-dependent $CP$ asymmetries in ${B}^{0}\ensuremath{\rightarrow}{D}^{+}{D}^{\ensuremath{-}}$ and ${B}^{0}\ensuremath{\rightarrow}{D}^{*\ifmmode\pm\else\textpm\fi{}}{D}^{\ensuremath{\mp}}$ decays using a data sample that contains $(772\ifmmode\pm\else\textpm\fi{}11)\ifmmode\times\else\texttimes\fi{}{10}^{6}B\overline{B}$ pairs collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. We determine the branching fractions to be $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{+}{D}^{\ensuremath{-}})=(2.12\ifmmode\pm\else\textpm\fi{}0.16\ifmmode\pm\else\textpm\fi{}0.18)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{*\ifmmode\pm\else\textpm\fi{}}{D}^{\ensuremath{\mp}})=(6.14\ifmmode\pm\else\textpm\fi{}0.29\ifmmode\pm\else\textpm\fi{}0.50)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. We measure $CP$ asymmetry parameters ${\mathcal{S}}_{{D}^{+}{D}^{\ensuremath{-}}}=\ensuremath{-}{1.06}_{\ensuremath{-}0.14}^{+0.21}\ifmmode\pm\else\textpm\fi{}0.08$ and ${\mathcal{C}}_{{D}^{+}{D}^{\ensuremath{-}}}=\ensuremath{-}0.43\ifmmode\pm\else\textpm\fi{}0.16\ifmmode\pm\else\textpm\fi{}0.05$ in ${B}^{0}\ensuremath{\rightarrow}{D}^{+}{D}^{\ensuremath{-}}$ and ${\mathcal{A}}_{{D}^{*}D}=+0.06\ifmmode\pm\else\textpm\fi{}0.05\ifmmode\pm\else\textpm\fi{}0.02$, ${\mathcal{S}}_{{D}^{*}D}=\ensuremath{-}0.78\ifmmode\pm\else\textpm\fi{}0.15\ifmmode\pm\else\textpm\fi{}0.05$, ${\mathcal{C}}_{{D}^{*}D}=\ensuremath{-}0.01\ifmmode\pm\else\textpm\fi{}0.11\ifmmode\pm\else\textpm\fi{}0.04$, $\ensuremath{\Delta}{\mathcal{S}}_{{D}^{*}D}=\ensuremath{-}0.13\ifmmode\pm\else\textpm\fi{}0.15\ifmmode\pm\else\textpm\fi{}0.04$ and $\ensuremath{\Delta}{\mathcal{C}}_{{D}^{*}D}=+0.12\ifmmode\pm\else\textpm\fi{}0.11\ifmmode\pm\else\textpm\fi{}0.03$ in ${B}^{0}\ensuremath{\rightarrow}{D}^{*\ifmmode\pm\else\textpm\fi{}}{D}^{\ensuremath{\mp}}$, where the first uncertainty is statistical and the second is systematic. We exclude the conservation of $CP$ symmetry in both decays at equal to or greater than $4\ensuremath{\sigma}$ significance.
TL;DR: In this paper, the processes γγ → ωϕ, ϕϕ and ωω were measured using an 870 fb(-1) data sample collected with the Belle detector at the KEKB asymmetric-energy e+ e-collider.
Abstract: The processes γγ → ωϕ, ϕϕ, and ωω are measured using an 870 fb(-1) data sample collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. Production of vector meson pairs is clearly observed and their cross sections are measured for masses that range from threshold to 4.0 GeV. In addition to signals from well established spin-zero and spin-two charmonium states, there are resonant structures below charmonium threshold, which have not been previously observed. We report a spin-parity analysis for the new structures and determine the products of the η(c), χ(c0), and χ(c2) two-photon decay widths and branching fractions to ωϕ, ϕϕ, and ωω.
Tohoku University1, Nagoya University2, University of Tokyo3, Pacific Northwest National Laboratory4, University of Sydney5, Peking University6, Indian Institute of Technology Guwahati7, Novosibirsk State University8, Fu Jen Catholic University9, National Central University10, National Taiwan University11, Hanyang University12, Yonsei University13, Korea Institute of Science and Technology Information14, Sungkyunkwan University15, Max Planck Society16, Charles University in Prague17, Tata Institute of Fundamental Research18, Nara Women's University19, Tohoku Gakuin University20, Kyungpook National University21, University of Melbourne22, Niigata University23, Korea University24, University of Maribor25, Karlsruhe Institute of Technology26, Indian Institute of Technology Madras27, University of Science and Technology of China28, University of Cincinnati29, École Polytechnique Fédérale de Lausanne30, Osaka City University31, Tokyo University of Agriculture and Technology32, Toho University33, Kanagawa University34, Luther College35, Virginia Tech36, Seoul National University37, Austrian Academy of Sciences38, Yamagata University39, Tokyo Institute of Technology40, University of Nova Gorica41, Gifu University42, Tokyo Metropolitan University43, Saga University44, University of Bonn45, National United University46
TL;DR: In this paper, the decay of B-0 → DK+ pi(-) followed by D-0 or K-pi(+) over bar (0) was investigated. But the decay rate was not shown to be (4.5(-5.0-1.8)) X 10(-2).
Abstract: We report a study of the decay B-0 -> DK+ pi(-) followed by D -> K- pi(+) , where D indicates D-0 or (D) over bar (0). We reconstruct the DK+ pi(-) state in a phase space corresponding to DK*(892)(0). The CP-violating angle phi(3) affects its decay rate via the interference between b -> u and b -> c transitions. The result is obtained from a 711 fb(-1) data sample that contains 772 X 10(6)B (B) over bar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+) e(-) collider. We measure the ratio R-DK*0 Gamma(B-0 -> [K- pi(+) ](D)K+ pi(-))/Gamma(B-0 -> [K+ pi(-)](D)K+ pi(-)) to be (4.5(-5.0-1.8)(+5.6+2.8)) X 10(-2), and set an upper limit of R-DK*0 < 0.16 at the 95% credible interval.
Nagoya University1, University of Tokyo2, Novosibirsk State University3, Pacific Northwest National Laboratory4, University of Sydney5, Indian Institute of Technology Guwahati6, Nara Women's University7, Polish Academy of Sciences8, University of Maribor9, Fu Jen Catholic University10, National Central University11, Hanyang University12, Yonsei University13, Korea Institute of Science and Technology Information14, Gyeongsang National University15, Sungkyunkwan University16, Max Planck Society17, Charles University in Prague18, Tata Institute of Fundamental Research19, Tohoku Gakuin University20, National Taiwan University21, Kyungpook National University22, Tohoku University23, University of Melbourne24, Niigata University25, Korea University26, University of Ljubljana27, Tokyo Metropolitan University28, University of Giessen29, Seoul National University30, Indian Institute of Technology Madras31, University of Science and Technology of China32, École Polytechnique Fédérale de Lausanne33, Osaka University34, Osaka City University35, Tokyo University of Agriculture and Technology36, Toho University37, Kanagawa University38, Luther College39, Virginia Tech40, Karlsruhe Institute of Technology41, Austrian Academy of Sciences42, Yamagata University43, Tokyo Institute of Technology44, Panjab University, Chandigarh45, University of Nova Gorica46, University of Bonn47, National United University48
TL;DR: In this paper, double-charmonium decays of the P-wave spin-triplet bottomonium states (Y(2S) -> gamma chi(bJ), chi (bJ) = 0.
Abstract: Using a sample of 158 x 10(6) Y(2S) events collected with the Belle detector, we search for the first time for double-charmonium decays of the P-wave spin-triplet bottomonium states (Y(2S) -> gamma chi(bJ), chi(bJ) -> J/psi J/psi, J/psi psi', psi'psi' for J 0, 1, and 2). No significant chi(bJ) signal is observed in the double-charmonium mass spectra, and we obtain the following upper limits: B(chi(bJ) -> J/psi J/psi) J/psi psi') psi'psi') < 3.1 x 10(-5), 6.2 x 10(-5), 1.6 x 10(-5) for J = 0, 1, and 2, respectively, at the 90% confidence level. These limits are significantly lower than the central values (with uncertainties of 50% to 70%) predicted using the light cone formalism but are consistent with calculations using the nonrelativistic QCD (NRQCD) factorization approach.
TL;DR: In this paper, the branching fraction, the polarization, and the parameters of the time-dependent CP violation in B-0 -> D*(+) D* (-) decays using a data sample of 772 x 10(6)B (B) over bar pairs, collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy e(+)e(-) collider.
Abstract: We report the measurement of the branching fraction, the polarization, and the parameters of the time-dependent CP violation in B-0 -> D*(+) D*(-) decays using a data sample of 772 x 10(6)B (B) over bar pairs, collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We obtain a branching fraction of B = (7.82 +/- 0.38 +/- 0.63) x 10(-4), a CP-odd fraction of R-perpendicular to = 0.138 +/- 0.024 +/- 0.006 and, additionally, a fraction of the longitudinal component in the transversity base of R-0 = 0.624 +/- 0.029 +/- 0.011. The measured values of the parameters of the CP violation are SD*+ D*- = 0.79 +/- 0.13 +/- 0.03 and A(D*+ D*-) 0.15 +/- 0.08 +/- 0.04.
TL;DR: A measurement of the CP-violation parameter sin2φ1 at the Υ(5S) resonance is reported using a new tagging method, called "B-π tagging," which yields results based on 121 fb(-1) of data recorded by the Belle detector at the KEKB e(+)e(-) collider.
Abstract: We report a measurement of the CP-violation parameter sin2 phi(1) at the gamma(5S) resonance using a new tagging method, called "B-pi tagging." In gamma(5S) decays containing a neutral B meson, a charged B, and a charged pion, the neutral B is reconstructed in the J/psi K-S(0) CP-eigenstate decay channel. The initial flavor of the neutral B meson at the moment of the gamma(5S) decay is opposite to that of the charged B and may thus be inferred from the charge of the pion without reconstructing the charged B. From the asymmetry between B-pi(+) and B-pi(-) tagged J/psi K-S(0) yields, we determine sin2 phi(1) 0.57 +/- 0.58(stat) +/- 0.06(syst). The results are based on 121 fb(-1) of data recorded by the Belle detector at the KEKB e(+) e(-) collider.
TL;DR: In this article, the authors report on a search for the charmless decays in the Standard Model for the σ-decays of σ + σ σ − σ to σ -π -to σ−σ −σ−π to ρ − ρ -to-π σπ −ρ −toρ σ 0.
Abstract: We report on a search for the charmless decays $B^{+} \to\phi\pi^{+}$ and $B^{0} \to\phi \pi^{0}$ that are strongly suppressed in the Standard Model. The analysis is based on a data sample of $657 \times 10^6$ $B \bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We find no significant signal and set upper limits of $3.3 \times 10^{-7}$ for $B^{+} \to \phi \pi^{+}$ and $1.5 \times 10^{-7}$ for $B^0 \to \phi \pi^0$ at the 90% confidence level.
TL;DR: In this paper, the decays of B- -> Ds(*)+ K- l- nubar in a data sample containing 657x10^6 BBbar pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider were reported.
Abstract: We report measurements of the decays B- -> Ds(*)+ K- l- nubar in a data sample containing 657x10^6 BBbar pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. We observe a signal with a significance of 6 sigma for the combined Ds and Ds* modes and find the first evidence of the B- -> Ds+ K- l- nubar decay with a significance of 3.4 sigma. We measure the following branching fractions: BF(B- -> Ds+ K- l nubar) = (0.30 +/- 0.09(stat) +0.11 -0.08(syst)) x 10^-3 and BF(B- -> Ds*+ K- l- nubar) = (0.59 +/- 0.12(stat) +/- 0.15(syst)) x 10^-3 and set an upper limit BF(B- -> Ds*+ K- l- nubar) < 0.56 x 10^-3 at the 90% confidence level. We also present the first measurement of the Ds+K- invariant mass distribution in these decays, which is dominated by a prominent peak around 2.6 GeV/c^2.
TL;DR: In this article, exclusive hadronic decays of these two bottomonium resonances to the three-body final states phi K+K-, omega pi(+)pi(-) and K*(0)(892)K-pi(+) were studied.
Abstract: Using samples of 102 x 10(6) Gamma(1S) and 158 x 10(6) Gamma(2S) events collected with the Belle detector, we study exclusive hadronic decays of these two bottomonium resonances to the three-body final states phi K+K-, omega pi(+)pi(-) and K*(0)(892)K-pi(+), and to the two-body Vector-Tensor states (phi f'(2)(1525), omega f(2)(1270), rho a(2)(1320) and K*(0)(892)(K) over bar*(0)(2)(1430)) and Axial-vector-Pseudoscalar (K-1(1270)K-+(-), K-1(1400)K-+(-) and b(1)(1235)(+)pi(-)) states. Signals are observed for the first time in the Y(1S) -> phi K+K-, omega pi(+)pi(-), K*K-0(-)pi(+), K*K-0*(0)(2) Gamma(2S) -> phi K+K-, K*K-0(-)pi(+) decay modes. Branching fractions are determined for all the processes, while 90% confidence level upper limits are established on the branching fractions for the modes with a statistical significance less than 3 sigma. The ratios of the branching fractions of Gamma(2S) and Gamma(1S) decays into the same final state are used to test a perturbative QCD prediction for OZI-suppressed bottomonium decays.
[...]
TL;DR: In this paper, the authors report on a search for the charmless decays that are strongly suppressed in the standard model and find no significant signal and set upper limits of $3.3 and $1.5 at the 90% confidence level.
Abstract: We report on a search for the charmless decays ${B}^{+}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{+}$ and ${B}^{0}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{0}$ that are strongly suppressed in the standard model. The analysis is based on a data sample of $657\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. We find no significant signal and set upper limits of $3.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$ for ${B}^{+}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{+}$ and $1.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$ for ${B}^{0}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{0}$ at the 90% confidence level.
Posted Content•
23 Aug 2012
TL;DR: In this article, the authors measured the branching fraction of B- -> tau- nu_tau-bar using the full Upsilon(4S) data sample containing 772*10^6 BBbar pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider.
Abstract: We measure the branching fraction of B- -> tau- nu_tau-bar using the full Upsilon(4S) data sample containing 772*10^6 BBbar pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. Events with BBbar pairs are tagged by reconstructing one of the B mesons decaying into hadronic final states, and B- -> tau- nu_tau-bar candidates are detected in the recoil. We find evidence for B- -> tau- nu_tau-bar with a significance of 3.0 standard deviations including systematic errors and measure a branching fraction B(B- -> tau- nu_tau-bar) = [0.72^{+0.27}_{-0.25}(stat) +/- 0.11(syst)] * 10^-4.