T Nagamine

Publications of T Nagamine

• An Automatic Spike Detection System Based on Elimination of False Positives Using the Large-Area Context in the Scalp EEG

  Authors: Zhanfeng Ji, T. Sugi, S. Goto, Xingyu Wang, A. Ikeda, T. Nagamine, H. Shibasaki, M. Nakamura

  Biomedical Engineering, IEEE Transactions on. 10/2011;

  Most automatic spike detection systems in the scalp electroencephalogram (EEG) focused on the characteristics of “spike.” However, the characteristics of “false positives” (FPs) have not been fullyMost automatic spike detection systems in the scalp electroencephalogram (EEG) focused on the characteristics of “spike.” However, the characteristics of “false positives” (FPs) have not been fully studied. In this paper, we proposed a system that contains a series of algorithms to eliminate FPs and a template method to confirm spikes. The system used large area context available on 49 channels from two common montages. The impact of slow-waves after spikes was taken into consideration, as well as the information from single channel, multichannel, and whole recording. Two types of FPs were identified in this paper. The ones from typical artifacts were identified by analysis of background EEG activities, and the ones from other EEG activities were declared by spatial and temporal characteristics of spike activities. Finally, a multichannel template method was used to assess the performance of the proposed system. The system was evaluated using 17 routine EEG recordings. Spike activities were observed in six of them. Effective multichannel templates were extracted from four recordings containing frequent spikes. The least selectivity was 92.6% and the most false positive rate was 0.26 min^-1. Proposed algorithms for elimination of FPs are also suitable for other algorithms to enhance performance since most FPs can be identified while few true spikes are eliminated.

• Application of X-Ray Computer Tomography for Observing the Central Void Formations and the Fuel Pin Deformations of Irradiated FBR Fuel Assemblies

  Authors: K. Katsuyama, T. Nagamine, H. Furuya

  Nuclear Science, IEEE Transactions on. 11/2010;

  In order to observe the structural change in the interior of irradiated fuel assemblies, a non-destructive post-irradiation examination (PIE) technique using X-ray computer tomography (X-ray CT) wasIn order to observe the structural change in the interior of irradiated fuel assemblies, a non-destructive post-irradiation examination (PIE) technique using X-ray computer tomography (X-ray CT) was developed. This X-ray CT technique was applied to observe the central void formations and fuel pin deformations of fuel assemblies which had been irradiated at high linear heat rating. The central void sizes in all fuel pins were measured on five cross sections of the core fuel column as a parameter for evaluating fuel thermal performance. In addition, the fuel pin deformations were analyzed from X-ray CT images obtained along the axial direction of a fuel assembly at the same separation interval. A dependence of void size on the linear heat rating was seen in the fuel assembly irradiated at high linear heat rating. In addition, significant undulations of the fuel pin were observed along the axial direction, coinciding with the wrapping wire pitch in the core fuel column. Application of the developed technique should provide enhanced resolution of measurements and simplify fuel PIEs.

• Belle II Technical Design Report

  Authors: T Abe, I. Adachi, K. Adamczyk, S Ahn, H. Aihara, K. Akai, M. Aloi, L. Andricek, K Aoki, Y Arai [......] Z P Zhang, J Zhao, L Zhao, Z Zhao, V. Zhilich, P Zhou, V. Zhulanov, T. Zivko, A. Zupanc, O. Zyukova

  11/2010;

  The Belle detector at the KEKB electron-positron collider has collected almost 1 billion Y(4S) events in its decade of operation. Super-KEKB, an upgrade of KEKB is under construction, to increase theThe Belle detector at the KEKB electron-positron collider has collected almost 1 billion Y(4S) events in its decade of operation. Super-KEKB, an upgrade of KEKB is under construction, to increase the luminosity by two orders of magnitude during a three-year shutdown, with an ultimate goal of 8E35 /cm^2 /s luminosity. To exploit the increased luminosity, an upgrade of the Belle detector has been proposed. A new international collaboration Belle-II, is being formed. The Technical Design Report presents physics motivation, basic methods of the accelerator upgrade, as well as key improvements of the detector. Comment: Edited by: Z. Dole\v{z}al and S. Uno

• Pixelated Readout Circuit for Pair-Monitor at International Linear Collider

  Authors: Y. Sato, K. Hashimoto, H. Ikeda, K. Ito, A. Miyamoto, T. Nagamine, R. Sasaki, Y. Takubo, T. Tauchi, H. Yamamoto, Y. Yokoyama

  Nuclear Science, IEEE Transactions on. 03/2010;

  The pair monitor measures the beam profile at the interaction point of the international linear collider. It extracts the information from the directional distribution of a large number ofThe pair monitor measures the beam profile at the interaction point of the international linear collider. It extracts the information from the directional distribution of a large number of electron-positron pairs created by collision of bunches. The pairs are detected by pixel detectors placed close to the beam on both sides of the interaction point, and a readout ASIC that meets the stringent requirements has been developed. In order to measure the beam profile as a function of location within a train, and also to deal with the high hit rate, the pixel detector is read out in 16 time slices per bunch train. In this paper, we describe the design of the readout circuit and present the result of performance tests.

• Evidence for Neutral B Meson Decays to omegaK;{*0}

  Authors: P. Goldenzweig, A Schwartz, I. Adachi, H. Aihara, K. Arinstein, V. Aulchenko, T. Aushev, S. Bahinipati, A. Bakich, A. Bay [......] E. Won, B. Yabsley, Y Yamashita, M Yamauchi, C Zhang, Z Zhang, V. Zhulanov, T. Zivko, A. Zupanc, O. Zyukova

  Physical review letters. 12/2008; 101(23):231801.

  We present the results of a study of the charmless vector-vector decay B;{0}-->omegaK;{*0} with 657x10;{6} BB[over ] pairs collected with the Belle detector at the KEKB e;{+}e;{-} collider. WeWe present the results of a study of the charmless vector-vector decay B;{0}-->omegaK;{*0} with 657x10;{6} BB[over ] pairs collected with the Belle detector at the KEKB e;{+}e;{-} collider. We measure the branching fraction to be B(B;{0}-->omegaK;{*0})=[1.8+/-0.7(stat)+/-0.3(syst)]x10;{-6} with 3.0sigma significance. We also perform a helicity analysis of the omega and K;{*0} vector mesons, and obtain the longitudinal polarization fraction f_{L}(B;{0}-->omegaK;{*0})=0.56+/-0.29(stat)-0.08+0.18(syst). Finally, we measure a large nonresonant branching fraction B[B;{0}-->omegaK;{+}pi;{-};M_{Kpi}in(0.755,1.250) GeV/c;{2} ]=[5.1+/-0.7(stat)+/-0.7(syst)]x10;{-6} with a significance of 9.5sigma.

• Observation of the decay B(0)-->J/psieta.

  Authors: M C Chang, K Abe, I. Adachi, H. Aihara, D. Anipko, K. Arinstein, T. Aushev, A. M. Bakich, E Barberio, A. Bay [......] E. Won, Q. L. Xie, A Yamaguchi, Y Yamashita, M Yamauchi, Y. Yusa, C. C. Zhang, L. M. Zhang, Z P Zhang, A. Zupanc

  Physical review letters. 03/2007; 98(13):131803.

  We report the first observation of B(0)-->J/psieta decay. These results are obtained from a data sample that contains 449 x10(6) BB[over] pairs accumulated at the Upsilon(4S) resonance with the BelleWe report the first observation of B(0)-->J/psieta decay. These results are obtained from a data sample that contains 449 x10(6) BB[over] pairs accumulated at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We observe a signal with a significance of 8.1 sigma and obtain a branching fraction of (9.5+/-1.7(stat)+/-0.8(syst)) x 10(-6).

• Measurement of inclusive Ds, D0, and J/psi rates and determination of the Bs(*)Bs(*) production fraction in bb Events at the Upsilon(5S) resonance.

  Authors: A. Drutskoy, K Abe, I. Adachi, H. Aihara, D. Anipko, K. Arinstein, V. Aulchenko, T. Aushev, S Banerjee, E Barberio [......] Q. L. Xie, B. D. Yabsley, A Yamaguchi, Y Yamashita, M Yamauchi, Y. Yusa, L. M. Zhang, Z P Zhang, V. Zhilich, A. Zupanc

  Physical review letters. 02/2007; 98(5):052001.

  The inclusive production of D(s), D(0), and J/psi mesons is studied using a 1.86 fb(-1) data sample collected on the Upsilon(5S) resonance with the Belle detector at the KEKB asymmetric-energyThe inclusive production of D(s), D(0), and J/psi mesons is studied using a 1.86 fb(-1) data sample collected on the Upsilon(5S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The number of bb events in this Upsilon(5S) data sample is determined. We measure the branching fractions B(Upsilon(5S)-->D(s)X)/2=(23.6+/-1.2+/-3.6)%, B(Upsilon(5S)-->D(0)X)/2=(53.8+/-2.0+/-3.4)%, and B(Upsilon(5S)-->J/psiX)/2=(1.030+/-0.080+/-0.067)%. From the D(s) and D(0) inclusive branching fractions the ratio f(s)=(18.0+/-1.3+/-3.2)% of B(s)(*)B(s)(*) to the total bb quark pair production at the Upsilon(5S) energy is obtained in a model-dependent way.

• Observation of time-dependent CP violation in B0 --> eta'K0 decays and improved measurements of CP asymmetries in B0 --> phiK0, KS0KS0KS0 and B0 --> J/psiK0 decays.

  Authors: K.-F. Chen, K Hara, M. Hazumi, T Higuchi, K. Miyabayashi, Y. Nakahama, K. Sumisawa, O. Tajima, Y. Ushiroda, Y. Yusa [......] E. Won, Q. L. Xie, B. D. Yabsley, A Yamaguchi, Y Yamashita, M Yamauchi, C. C. Zhang, Z P Zhang, V. Zhilich, A. Zupanc

  Physical review letters. 01/2007; 98(3):031802.

  We present improved measurements of CP-violation parameters in B(0) --> phiK(0), eta(')K(0), KS(0)KS(0)KS(0) decays based on a sample of 535 x 10(6) BB pairs collected at the Upsilon(4S) resonanceWe present improved measurements of CP-violation parameters in B(0) --> phiK(0), eta(')K(0), KS(0)KS(0)KS(0) decays based on a sample of 535 x 10(6) BB pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider. We obtain sin2phi1(eff)=+0.64+/-0.10(stat)+/-0.04(syst) for B(0) --> eta(')K(0), +0.50+/-0.21(stat)+/-0.06(syst) for B(0) --> phiK(0), and +0.30+/-0.32(stat)+/-0.08(syst) for B(0) --> KS(0)KS(0)KS(0) decays. We have observed CP violation in the B(0) --> eta(')K(0) decay with a significance of 5.6 standard deviations. We also perform an improved measurement of CP asymmetries in B(0) --> J/psiK(0) decays and obtain sin2phi1=+0.642+/-0.031(stat)+/-0.017(syst).

• Evidence of the purely leptonic decay B- --> tau- nu(tau).

  Authors: K. Ikado, K Abe, I. Adachi, H. Aihara, K. Akai, M. Akemoto, D. Anipko, K. Arinstein, V. Aulchenko, T. Aushev [......] B. D. Yabsley, A Yamaguchi, Y Yamashita, M Yamauchi, M Yoshida, Y. Yusa, L. M. Zhang, Z P Zhang, V. Zhilich, D. Zürcher

  Physical review letters. 12/2006; 97(25):251802.

  We present the first evidence of the decay B- --> tau- nu(tau), using 414 fb(-1) of data collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+ e- collider.We present the first evidence of the decay B- --> tau- nu(tau), using 414 fb(-1) of data collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+ e- collider. Events are tagged by fully reconstructing one of the B mesons in hadronic modes. We detect the signal with a significance of 3.5 standard deviations including systematics and measure the branching fraction to be B(B- --> tau- nu(tau)) = (1.79(-0.49) +0.56(stat)(-0.51) +0.46(syst)) x 10(-4). This implies that fB = 0.229(-0.031) +0.036(stat)(-0.037) +0.034(syst) GeV and is the first direct measurement of this quantity.

• Study of decay mechanisms in B--->Lambdac+ppi- decays and observation of low-mass structure in the Lambdac+p system.

  Authors: N. Gabyshev, K Abe, I. Adachi, H. Aihara, Y Asano, V. Aulchenko, T. Aushev, A. M. Bakich, U. Bitenc, I. Bizjak [......] H Yamamoto, Y Yamashita, M Yamauchi, Heyoung Yang, C. C. Zhang, J Zhang, L. M. Zhang, Z P Zhang, V. Zhilich, D Zontar

  Physical review letters. 12/2006; 97(24):242001.

  Using a sample of 152 x 10(6) BB pairs accumulated with the Belle detector at the KEKB e+e- collider, we study the decay mechanism of three-body charmed decay B- --> Lambdac+ ppi-. The intermediateUsing a sample of 152 x 10(6) BB pairs accumulated with the Belle detector at the KEKB e+e- collider, we study the decay mechanism of three-body charmed decay B- --> Lambdac+ ppi-. The intermediate two-body decay B--->Sigmac (2455)0 p is observed for the first time with a branching fraction of (3.7 +/- 0.7 +/- 0.4 +/- 1.0) x 10(-5) and a statistical significance of 8.4sigma. We also observe a low-mass enhancement in the (Lambdac+p) system, which can be parametrized as a Breit-Wigner function with a mass of (3.35(-0.02)(+0.01) +/-0.02) GeV/c2 and a width of (0.07(-0.03)(+0.04) +/-0.04) GeV/c2. We measure its branching fraction to be (3.9(-0.7)(+0.8) +/- 0.4 +/- 1.0) x 10(-5) with a statistical significance of 6.2sigma. The errors are statistical, systematic, and that of the Lambdac+-->pK- pi+ decay branching fraction.

• Observation of new states decaying into Lambda(c)(+)Kappa(-)pi(+) and Lambda(c)(+)Kappa(0)/(s)pi(-).

  Authors: R. Chistov, K Abe, I. Adachi, H. Aihara, D. Anipko, V. Aulchenko, T. Aushev, A. M. Bakich, V. Balagura, E Barberio [......] Y Watanabe, E. Won, C H Wu, Q. L. Xie, B. D. Yabsley, A Yamaguchi, Y Yamashita, M Yamauchi, L. M. Zhang, Z P Zhang

  Physical review letters. 11/2006; 97(16):162001.

  We report the first observation of two charmed strange baryons that decay into Lambda(c)(+)Kappa(-)pi(+). The broader of the two states is measured to have a mass of 2978.5+/-2.1+/-2.0 MeV/c2 and aWe report the first observation of two charmed strange baryons that decay into Lambda(c)(+)Kappa(-)pi(+). The broader of the two states is measured to have a mass of 2978.5+/-2.1+/-2.0 MeV/c2 and a width of 43.5+/-7.5+/-7.0 MeV/c2. The mass and width of the narrow state are measured to be 3076.7+/-0.9+/-0.5 MeV/c;{2} and 6.2+/-1.2+/-0.8 MeV/c2, respectively. We also perform a search for the isospin partner states that decay into Lambda(c)(+)Kappa(0)/(s)pi(-) and observe a significant signal at the mass of 3082.8+/-1.8+/-1.5 MeV/c2. The data used for this analysis were accumulated at or near the Upsilon(4S) resonance, using the Belle detector at the e+ e- asymmetric-energy collider KEKB. The integrated luminosity of the data sample used is 461.5 fb(-1).

• Observation of a near-threshold D(0)D[over](0)pi(0) enhancement in B-->D(0)D[over](0)pi(0)Kappa decay.

  Authors: G. Gokhroo, G. Majumder, K Abe, I. Adachi, H. Aihara, D. Anipko, T. Aushev, T Aziz, A. M. Bakich, V. Balagura [......] M. -Z. Wang, Y Watanabe, E. Won, C H Wu, A Yamaguchi, Y Yamashita, M Yamauchi, C. C. Zhang, Z P Zhang, V. Zhilich

  Physical review letters. 10/2006; 97(16):162002.

  We report the first observation of a near-threshold enhancement in the D(0)D[over](0)pi(0) system from B-->D(0)D[over](0)pi(0)Kappa decays using a 414 fb(-1) data sample collected at the Upsilon(4S)We report the first observation of a near-threshold enhancement in the D(0)D[over](0)pi(0) system from B-->D(0)D[over](0)pi(0)Kappa decays using a 414 fb(-1) data sample collected at the Upsilon(4S) resonance. The enhancement peaks at a mass M=3875.2+/-0.7(+0.3)/(-1.6) +/-0.8 MeV/c2 and the branching fraction for events in the peak is B(B-->D(0)D[over](0)pi(0)Kappa)=(1.22+/-0.31(+0.23)/(-0.30))x10(-4). The data were collected with the Belle detector at the KEKB energy-asymmetric e+ e- collider.

• Evidence for B-->eta'pi and improved measurements for B-->eta'K.

  Authors: J. Schümann, C H Wang, K Abe, I. Adachi, H. Aihara, D. Anipko, K. Arinstein, Y Asano, T. Aushev, A. M. Bakich [......] A Yamaguchi, Y Yamashita, M Yamauchi, J. Ying, Y. Yusa, C. C. Zhang, L. M. Zhang, Z P Zhang, V. Zhilich, D. Zürcher

  Physical review letters. 08/2006; 97(6):061802.

  We report evidence for the exclusive two-body charmless hadronic B meson decay B-->eta'pi, and improved measurements of B-->eta'K. The results are obtained from a data sample of 386x10(6) BB pairsWe report evidence for the exclusive two-body charmless hadronic B meson decay B-->eta'pi, and improved measurements of B-->eta'K. The results are obtained from a data sample of 386x10(6) BB pairs collected at the Upsilon(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e+e- collider. We measure B(B+-->eta'pi+)=[1.76(-0.62)(+0.67)(stat)(-0.14)(+0.15)(syst)]x10(-6) and B(B0-->eta'pi0)=[2.79(-0.96)(+1.02)(stat)(-0.34)(+0.25)(syst)]x10(-6). We also find the ratio of B(B+-->eta'K+)/B(B0-->eta'K0)=1.17+/-0.08(stat)+/-0.03(syst) and measure the direct CP asymmetries for the charged modes.

• Evidence for large direct CP violation in B+/- --> rho(770)0K+/- from analysis of three-body charmless B+/- --> K+/-pi+/-pi+/- decays.

  Authors: A. Garmash, K Abe, I. Adachi, H. Aihara, Y Asano, T. Aushev, T Aziz, S. Bahinipati, A. M. Bakich, M. Barbero [......] Y Watanabe, E. Won, Q. L. Xie, A Yamaguchi, M Yamauchi, Heyoung Yang, L. M. Zhang, Z P Zhang, V. Zhilich, D. Zürcher

  Physical review letters. 07/2006; 96(25):251803.

  We report results on a Dalitz analysis of three-body charmless B+/- --> K+/-pi+/-pi+/- decay including searches for direct CP violation. We report the first observation of the decay B+/- -->We report results on a Dalitz analysis of three-body charmless B+/- --> K+/-pi+/-pi+/- decay including searches for direct CP violation. We report the first observation of the decay B+/- --> f2(1270)K+/- with a statistical significance above 6sigma. We also observe first evidence for large direct CP violation in the B+/- --> rho(770)0K+/- channel. The results are obtained with a data sample that contains 386 10(6) BB pairs collected at the Y(4s) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider.

• Measurement of forward-backward asymmetry and Wilson coefficients in B --> K*l+l-.

  Authors: A Ishikawa, K Abe, I. Adachi, H. Aihara, D. Anipko, Y Asano, T. Aushev, A. M. Bakich, V. Balagura, M. Barbero [......] Q. L. Xie, B. D. Yabsley, A Yamaguchi, Y Yamashita, M Yamauchi, J. Ying, Y. Yusa, J Zhang, L. M. Zhang, Z P Zhang

  Physical review letters. 07/2006; 96(25):251801.

  We report the first measurement of the forward-backward asymmetry and the ratios of Wilson coefficients and in A9/A7 and A10/A7 in B --> K*l+l-, where l represents an electron or a muon. We findWe report the first measurement of the forward-backward asymmetry and the ratios of Wilson coefficients and in A9/A7 and A10/A7 in B --> K*l+l-, where l represents an electron or a muon. We find evidence for the forward-backward asymmetry with a significance of 3.4sigma. The results are obtained from a data sample containing 386 x 10(6) BB pairs that were collected on the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider.

• Observation of a chi(c2)' candidate in gamma gamma --> DD production at belle.

  Authors: S Uehara, K Abe, I. Adachi, H. Aihara, K. Arinstein, Y Asano, V. Aulchenko, T. Aushev, A. M. Bakich, V. Balagura [......] Q. L. Xie, B. D. Yabsley, A Yamaguchi, M Yamauchi, J. Ying, C. C. Zhang, J Zhang, L. M. Zhang, Z P Zhang, V. Zhilich

  Physical review letters. 03/2006; 96(8):082003.

  We report on a search for new resonant states in the process gamma gamma --> DD. A candidate C-even charmonium state is observed in the vicinity of 3.93 GeV/c2. The production rate and the angularWe report on a search for new resonant states in the process gamma gamma --> DD. A candidate C-even charmonium state is observed in the vicinity of 3.93 GeV/c2. The production rate and the angular distribution in the gamma gamma center-of-mass frame suggest that this state is the previously unobserved chi(c2)', the 2(3)P2 charmonium state.

• Measurement of the wrong-sign decays D0 --> K+ pi- pi0 and D0 --> K+ pi- pi+ pi-, and search for CP violation.

  Authors: X. C. Tian, Y Ban, K Abe, H. Aihara, K. Arinstein, Y Asano, V. Aulchenko, T. Aushev, A. M. Bakich, S Banerjee [......] Q. L. Xie, B. D. Yabsley, A Yamaguchi, Y Yamashita, M Yamauchi, J. Ying, Y Yuan, C. C. Zhang, L. M. Zhang, Z P Zhang

  Physical review letters. 12/2005; 95(23):231801.

  Using 281 fb-1 of data from the Belle experiment recorded at or near the (4S) resonance, we have measured the rates of the "wrong-sign" decays D0 --> K+ pi- pi0 and D0 --> K+ pi- pi+ pi- relative toUsing 281 fb-1 of data from the Belle experiment recorded at or near the (4S) resonance, we have measured the rates of the "wrong-sign" decays D0 --> K+ pi- pi0 and D0 --> K+ pi- pi+ pi- relative to those of the Cabibbo-favored decays D0 --> K- pi+ pi0 and D0 --> K- pi+ pi+ pi-. These wrong-sign decays proceed via a doubly Cabibbo-suppressed amplitude or via D0-D0 mixing; the latter has not yet been observed. We obtain R(WS)(K pi pi0) = [0.229 +/- 0.015(stat)(+0.013)(-0.009)(syst)]% and R(WS)(K3pi) = [0.320 +/- 0.018(stat)(+0.018)(0.013)(syst)]%. The CP asymmetries are measured to be -0.006 +/- 0.053 and -0.018 +/- 0.044 for the K+ pi- pi0 and K+ pi- pi+ pi- final states, respectively.

• Determination of /Vub/ from measurements of the inclusive charmless semileptonic partial rates of B mesons using full reconstruction tags.

  Authors: I. Bizjak, K Abe, H. Aihara, Y Asano, S. Bahinipati, A. M. Bakich, Y Ban, E Barberio, M. Barbero, A. Bay [......] Q. L. Xie, B. D. Yabsley, A Yamaguchi, Y Yamashita, M Yamauchi, Heyoung Yang, L. M. Zhang, Z P Zhang, V. Zhilich, D Zontar

  Physical review letters. 12/2005; 95(24):241801.

  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 byWe 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.

• Improved evidence for direct CP violation in B0-->pi+pi- decays and model-independent constraints on phi2.

  Authors: K Abe, I. Adachi, H. Aihara, K. Arinstein, Y Asano, T. Aushev, A. M. Bakich, Y Ban, E Barberio, M. Barbero [......] A Yamaguchi, Y Yamashita, M Yamauchi, Heyoung Yang, J Zhang, L. M. Zhang, Z P Zhang, V. Zhilich, D Zontar, D. Zürcher

  Physical review letters. 10/2005; 95(10):101801.

  We present a new measurement of the time-dependent CP-violating parameters in B(0)--> pi(+)pi(-) decays with 275 x 10(6) BB pairs collected with the Belle detector at the KEKB asymmetric-energyWe present a new measurement of the time-dependent CP-violating parameters in B(0)--> pi(+)pi(-) decays with 275 x 10(6) BB pairs collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider operating at the Gamma(4S) resonance. We find 666 +/- 43 B(0) --> pi(+)pi(-) events and measure the CP-violating parameters: S(pipi) = -0.67 +/- 0.16(stat) +/- 0.06(syst) and A(pipi) = +0.56 +/- 0.12(stat) +/- 0.06(syst). We find evidence for large direct CP violation with a significance greater than 4 standard deviations for any S(pipi) value. Using isospin relations, we obtain 95.4% confidence intervals for the Cabibbo-Kobayashi-Maskawa quark-mixing matrix angle phi(2) of 0 degree < phiv(2) < 19 degrees and 71 degrees < phi(2) < 180 degrees.

• Studies of CP violation in B-->J/PsiK* decays.

  Authors: R. Itoh, Y. Onuki, K Abe, I. Adachi, H. Aihara, Y Asano, T. Aushev, A. M. Bakich, Y Ban, E Barberio [......] B. D. Yabsley, A Yamaguchi, Y Yamashita, M Yamauchi, Heyoung Yang, J Zhang, L. M. Zhang, Z P Zhang, V. Zhilich, D Zontar

  Physical review letters. 09/2005; 95(9):091601.

  CP violation in B-->J/PsiK* decays is studied using an angular analysis in a data sample of 253 fb(-1) recorded with the Belle detector at the KEKB e(+)e(-) collider. The flavor separatedCP violation in B-->J/PsiK* decays is studied using an angular analysis in a data sample of 253 fb(-1) recorded with the Belle detector at the KEKB e(+)e(-) collider. The flavor separated measurements of the decay amplitudes indicate no evidence for direct CP violation. T-odd CP violation is studied using the asymmetries in triple product correlations, and the results are consistent with the standard model null predictions. The time-dependent angular analysis gives the following values of CP-violating parameters: sin(2phi(1) = 0.24 +/- 0.31 +/- 0.05 and cos(2phi(1)=0.56 +/- 0.79 +/- 0.11.