We present a new measurement of the CKM matrix element $|V_{cb}|$ from $ B^{0} rightarrow D^{*}ell nu$ decays, reconstructed with full Belle data set ($711 , rm fb^{-1}$). Two form factor parameterisations, based on work by the CLN and BGL groups, are used to extract the product $mathcal{F}(1)eta_{rm EW}|V_{cb}|$ and the decay form factors, where $mathcal{F}(1)$ is the factor normalisation and $eta_{rm EW}$ is a small electroweak correction. In the CLN parameterisation we find $mathcal{F}(1)eta_{rm EW}|V_{cb}| = (35.06 pm 0.15 pm 0.54) times 10^{-3}$, $rho^{2}=1.106 pm 0.031 pm 0.007$, $R_{1}(1)=1.229 pm 0.028 pm 0.009$, $R_{2}(1)=0.852 pm 0.021 pm 0.006$. In the BGL parameterisation we find $mathcal{F}(1)eta_{rm EW}|V_{cb}|= 38.73 pm 0.25 pm 0.60$, which is higher but consistent with the determination from inclusive semileptonic $B$ decays when correcting for $mathcal{F}(1)eta_{rm EW}$. This is the most precise measurement of $mathcal{F}(1)eta_{rm EW}|V_{cb}|$ and form factors that has ever been carried out, and the first direct study of the BGL form factor parameterisation in an experimental measurement.

Abstract We present the first measurement of the Michel parameters η ‾ and ξκ in the radiative leptonic decay of the τ lepton using 703 fb-1 of data collected with the Belle detector at the KEKB e + e − collider. The Michel parameters are measured by an unbinned maximum likelihood fit to the kinematic information of e + e − → τ + τ − → ( π + π 0 ν ‾ ) ( l − ν ν ‾ γ ) ( l = e  or  μ ) . The preliminary values of the measured Michel parameters are η ‾ = − 2.0 ± 1.5 ± 0.8 and ξ κ = 0.6 ± 0.4 ± 0.2 , where the first error is statistical and the second is systematic.

We report the first measurement of the τ lepton polarization in the decay B̅→ D^* τ^- ν̅_τ as well as a new measurement of the ratio of the branching fractions R(D^*) = ℬ(B̅→ D^* τ^- ν̅_τ) / ℬ(B̅→ D^* ℓ^- ν̅_ℓ), where ℓ^- denotes an electron or a muon, with the decays τ^- →π^- ν_τ and τ^- →ρ^- ν_τ. We use the full data sample of 772 × 10^6 BB̅ pairs accumulated with the Belle detector at the KEKB electron-positron collider. Our preliminary results, R(D^*) = 0.276 ± 0.034 (stat.) ^+0.029 _-0.026 (syst.) and P_τ = -0.44 ± 0.47 (stat.) ^+0.20 _-0.17 (syst.), are consistent with the theoretical predictions of the Standard Model within 0.6 standard deviation.

We present the first measurement of the Michel parameters η̅ and ξκ in the radiative leptonic decay of the τ lepton using 703 fb^-1 of data collected with the Belle detector at the KEKB e^+e^- collider. The Michel parameters are measured by an unbinned maximum likelihood fit to the kinematic information of e^+e^-→τ^+τ^-→ (π^+π^0 ν̅)(l^-νν̅γ) (l=e or μ). The preliminary values of the measured Michel parameters are η̅ = -2.0 ± 1.5 ± 0.8 and ξκ = 0.6 ± 0.4 ± 0.2, where the first error is statistical and the second is systematic.

We report a measurement of the time-integrated CP asymmetry in the neutral charm meson decay D^0 → K^0_S K^0_S using 921 fb^-1 data collected at the Υ(4S) and Υ(5S) resonances with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. The observed asymmetry is A_CP(D^0 → K^0_S K^0_S) = (-0.02 ± 1.53 ± 0.17) %, where the first uncertainty is statistical and the second systematic. This latter uncertainty is dominated by the error of the normalisation channel. The result is consistent with Standard Model expectations and improves the uncertainty with respect to previous measurement of this quantity by more than a factor of three.

We report a search for B^0→ηη with a data sample corresponding to an integrated luminosity of 698 fb^-1 containing 753 × 10^6 BB̅ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. The branching fraction is measured to be ℬ(B^0→ηη ) = (7.6^+2.7 +1.4_-2.3 -1.6) × 10^-7 at the level of 3.3 standard deviations above zero, which provides the first evidence for the decay B^0→ηη.

We report a study of radiative decays of χ_bJ(1P)(J=0,1,2) mesons into 74 hadronic final states comprising charged and neutral pions, kaons, protons; out of these, 41 modes are observed with at least 5 standard deviation significance. Our measurements not only improve the previous measurements by the CLEO Collaboration but also lead to first observations in many new modes. The large sample allows us to probe the total decay width of the χ_b0(1P). In the absence of a statistically significant result, a 90 upper limit is set on the width at Γ_total< 2.4 MeV. Our results are based on 24.7 fb^-1 of e+e- collision data recorded by the Belle detector at the Υ(2S) resonance, corresponding to (157.8±3.6)×10^6 Υ(2S) decays.

We present a measurement of angular observables, P_4', P_5', P_6', P_8', in the decay B^0 → K^∗(892)^0 ℓ^+ ℓ^-, where ℓ^+ℓ^- is either e^+e^- or μ^+μ^-. The analysis is performed on a data sample corresponding to an integrated luminosity of 711 fb^-1 containing 772× 10^6 BB̅ pairs, collected at the Υ(4S) resonance with the Belle detector at the asymmetric-energy e^+e^- collider KEKB. Four angular observables, P_4,5,6,8' are extracted in five bins of the invariant mass squared of the lepton system, q^2. We compare our results for P_4,5,6,8' with Standard Model predictions including the q^2 region in which the LHCb collaboration reported the so-called P_5' anomaly.

We report a measurement of the amplitude ratio r_S of B^0 → D^0K^*0 and B^0 →D̅^̅0̅K^*0 decays with a model-independent Dalitz plot analysis using D→ K_S^0π^+π^- decays. Using the full data sample of 772×10^6 BB̅ pairs collected at the Υ(4S) resonance with the Belle detector at KEKB accelerator the upper limit is r_S < 0.87 at the 68 model-independent Dalitz analysis, and is consistent with results from other analyses. The value of r_S indicates the sensitivity of the decay to ϕ_3 because the statistical uncertainty is proportional to 1/r_S. The r_S result is obtained from observables (x_±, y_±) x_- = +0.4 ^+1.0 +0.0_-0.6 -0.1±0.0 y_- = -0.6 ^+0.8 +0.1_-1.0 -0.0±0.1 x_+ = +0.1 ^+0.7 +0.0_-0.4 -0.1±0.1 y_+ = +0.3 ^+0.5 +0.0_-0.8 -0.1±0.1 , where x_± = r_S cos(δ_S ±ϕ_3), y_± = r_S sin(δ_S ±ϕ_3) and ϕ_3 (δ_S) are the weak (strong) phase difference between B^0 → D^0K^*0 and B^0 →D̅^̅0̅K^*0. The first uncertainty is statistical, the second is the experimental systematic and the third is the systematic due to the uncertainties on c_i and s_i parameters measured by CLEO.

We present an extraction of azimuthal correlations between two pairs of charged pions detected in opposite jets from electron-positron annihilation. These correlations may arise from the dependence of the di-pion fragmentation on the polarization of the parent quark in the process $e^+e^- \rightarrow q \bar{q}$. Due to the correlation of the quark polarizations, the cross-section of di-pion pair production, in which the pion pairs are detected in opposite jets in a dijet event, exhibits a modulation in the azimuthal angles of the planes containing the hadron pairs with respect to the production plane. The measurement of this modulation allows access to combinations of fragmentation functions that are sensitive to the quark's transverse polarization and helicity. Within our uncertainties we do not observe a significant signal from the previously unmeasured helicity dependent fragmentation function $G_1^\perp$. This measurement uses a dataset of 938~fb$^{-1}$ collected by the Belle experiment at or near $\sqrt{s}\approx10.58$ GeV.

We report a measurement of the branching fraction of B^+ →τ^+ ν_τ decays using a data sample of 772 × 10^6 B B̅ pairs, collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. We reconstruct the accompanying B meson in a semileptonic decay and detect the B^+ →τ^+ ν_τ candidate in the recoiling event. We obtain a branching fraction of B(B^+ →τ^+ ν_τ) = [1.25 ± 0.28 ( stat.) ± 0.27( syst.)] × 10^-4. This result is in good agreement with previous measurements and the expectation from calculations based on the Standard Model.

P. Naik, J. Rademacker, D. M. Asner, K. W. Edwards, J. Reed, A. N. Robichaud, G. Tatishvili, R. A. Briere, H. Vogel, P. U. E. Onyisi, J. L. Rosner, J. P. Alexander, D. G. Cassel, J. E. Duboscq, R. Ehrlich, L. Fields, R. S. Galik, L. Gibbons, R. Gray, S. W. Gray, D. L. Hartill, B. K. Heltsley, D. Hertz, J. M. Hunt, J. Kandaswamy, D. L. Kreinick, V. E. Kuznetsov, J. Ledoux, H. MahlkeKruger, D. Mohapatra, J. R. Patterson, D. Peterson, D. Riley, A. Ryd, A. J. Sadoff, X. Shi, S. Stroiney, W. M. Sun, T. Wilksen, S. B. Athar, J. Yelton, P. Rubin, S. Mehrabyan, N. Lowrey, M. Selen, E. J. White, J. Wiss, R. E. Mitchell, M. R. Shepherd, D. Besson, T. K. Pedlar, D. Cronin-Hennessy, K. Y. Gao, J. Hietala, Y. Kubota, T. Klein, R. Poling, A. W. Scott, P. Zweber, S. Dobbs, Z. Metreveli, K. K. Seth, B. J. Y. Tan, A. Tomaradze, J. Libby, L. Martin, A. Powell, G. Wilkinson, H. Mendez, J. Y. Ge, D. H. Miller, V. Pavlunin, B. Sanghi, I. P. J. Shipsey, B. Xin, G. S. Adams, D. Hu, B. Moziak, J. Napolitano, Q. He, J. Insler, H. Muramatsu, C. S. Park, E. H. Thorndike, F. Yang, M. Artuso, S. Blusk, S. Khalil, J. Li, R. Mountain, K. Randrianarivony, N. Sultana, T. Skwarnicki, S. Stone, J. C. Wang, L. M. Zhang, G. Bonvicini, D. Cinabro, M. Dubrovin, A. Lincoln, and K. M. Ecklund

J. P. Alexander, D. G. Cassel, J. E. Duboscq, R. Ehrlich, L. Fields, R. S. Galik, L. Gibbons, R. Gray, S. W. Gray, D. L. Hartill, B. K. Heltsley, D. Hertz, J. M. Hunt, J. Kandaswamy, D. L. Kreinick, V. E. Kuznetsov, J. Ledoux, H. MahlkeKruger, D. Mohapatra, J. R. Patterson, D. Peterson, D. Riley, A. Ryd, A. J. Sadoff, X. Shi, S. Stroiney, W. M. Sun, T. Wilksen, J. Yelton, P. Rubin, N. Lowrey, S. Mehrabyan, M. Selen, J. Wiss, R. E. Mitchell, M. R. Shepherd, D. Besson, T. K. Pedlar, D. Cronin-Hennessy, K. Y. Gao, J. Hietala, Y. Kubota, T. Klein, R. Poling, A. W. Scott, P. Zweber, S. Dobbs, Z. Metreveli, K. K. Seth, B. J. Y. Tan, A. Tomaradze, J. Libby, L. Martin, A. Powell, G. Wilkinson, H. Mendez, J. Y. Ge, D. H. Miller, V. Pavlunin, B. Sanghi, I. P. J. Shipsey, B. Xin, G. S. Adams, D. Hu, B. Moziak, J. Napolitano, K. M. Ecklund, Q. He, J. Insler, H. Muramatsu, C. S. Park, E. H. Thorndike, F. Yang, M. Artuso, S. Blusk, S. Khalil, J. Li, R. Mountain, K. Randrianarivony, N. Sultana, T. Skwarnicki, S. Stone, J. C. Wang, L. M. Zhang, G. Bonvicini, D. Cinabro, M. Dubrovin, A. Lincoln, M. J. Smith, P. Naik, J. Rademacker, D. M. Asner, K. W. Edwards, J. Reed, A. N. Robichaud, G. Tatishvili, E. J. White, R. A. Briere, H. Vogel, P. U. E. Onyisi, and J. L. Rosner

P. Rubin, C. Cawlfield, B. I. Eisenstein, I. Karliner, D. Kim, N. Lowrey, P. Naik, C. Sedlack, M. Selen, E. J. White, J. Wiss, M. R. Shepherd, D. Besson, T. K. Pedlar, D. Cronin-Hennessy, K. Y. Gao, D. T. Gong, J. Hietala, Y. Kubota, T. Klein, B. W. Lang, R. Poling, A. W. Scott, A. Smith, S. Dobbs, Z. Metreveli, K. K. Seth, A. Tomaradze, P. Zweber, J. Ernst, H. Severini, S. A. Dytman, W. Love, V. Savinov, O. Aquines, Z. Li, A. Lopez, S. Mehrabyan, H. Mendez, J. Ramirez, G. S. Huang, D. H. Miller, V. Pavlunin, B. Sanghi, I. P. J. Shipsey, B. Xin, G. S. Adams, M. Anderson, J. P. Cummings, I. Danko, J. Napolitano, Q. He, J. Insler, H. Muramatsu, C. S. Park, E. H. Thorndike, T. E. Coan, Y. S. Gao, F. Liu, M. Artuso, S. Blusk, J. Butt, J. Li, N. Menaa, R. Mountain, S. Nisar, K. Randrianarivony, R. Redjimi, R. Sia, T. Skwarnicki, S. Stone, J. C. Wang, K. Zhang, S. E. Csorna, G. Bonvicini, D. Cinabro, M. Dubrovin, A. Lincoln, D. M. Asner, K. W. Edwards, R. A. Briere, I. Brock, J. Chen, T. Ferguson, G. Tatishvili, H. Vogel, M. E. Watkins, J. L. Rosner, N. E. Adam, J. P. Alexander, K. Berkelman, D. G. Cassel, J. E. Duboscq, K. M. Ecklund, R. Ehrlich, L. Fields, L. Gibbons, R. Gray, S. W. Gray, D. L. Hartill, B. K. Heltsley, D. Hertz, C. D. Jones, J. Kandaswamy, D. L. Kreinick, V. E. Kuznetsov, H. Mahlke-Kruger, T. O. Meyer, P. U. E. Onyisi, J. R. Patterson, D. Peterson, J. Pivarski, D. Riley, A. Ryd, A. J. Sadoff, H. Schwarthoff, X. Shi, S. Stroiney, W. M. Sun, T. Wilksen, M. Weinberger, S. B. Athar, R. Patel, V. Potlia, H. Stoeck, and J. Yelton

A measurement of the rate for the "wrong-sign" decay D0 -> K+ pi- pi+ pi- relative to that for the "right-sign" decay D0 -> K- pi+ pi+ pi- is presented. Using 791 fb-1 of data collected with the Belle detector, we obtain a branching fraction ratio of R_WS = [0.324 +- 0.008 (stat) +- 0.007 (sys)]%. Multiplying this ratio by the world average value for the branching fraction B(D0 -> K- pi+ pi+ pi-) gives a branching fraction B(D0 -> K+ pi- pi+ pi-) = (2.61 +- 0.06 +0.09 -0.08) x 10-4.