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Measurement of|Vub|from Inclusive Charmless SemileptonicBDecays
Urquijo, P.,Barberio, E.,Adachi, I.,Aihara, H.,Arinstein, K.,Bakich, A. M.,Belous, K.,Bhardwaj, V.,Bischofberger, M.,Bozek, A.,Brač,ko, M.,Browder, T. E.,Chao, Y.,Chen, A.,Cheon, B. G.,Chistov, R American Physical Society 2010 Physical review letters Vol.104 No.2
<P>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.</P>
Belle Collaboration,Hayasaka, K.,Inami, K.,Miyazaki, Y.,Arinstein, K.,Aulchenko, V.,Aushev, T.,Bakich, A.M.,Bay, A.,Belous, K.,Bhardwaj, V.,Bischofberger, M.,Bozek, A.,Brako, M.,Browder, T.E.,Chang, M North-Holland Pub. Co 2010 Physics letters: B Vol.687 No.2
<P>We present a search for lepton-flavor-violating tau decays into three leptons (electrons or muons) using 782 fb(-1) of data collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. No evidence for these decays is observed and we set 90% confidence level upper limits on the branching fractions between 1.5 x 10(-8) and 2.7 x 10(-8). (C) 2010 Elsevier B.V. All rights reserved.</P>
Evidence for semileptonicB−→pp¯ℓ−ν¯ℓdecays
Tien, K.-J.,Wang, M.-Z.,Adachi, I.,Aihara, H.,Asner, D. M.,Aulchenko, V.,Aushev, T.,Bakich, A. M.,Bala, A.,Bhuyan, B.,Bozek, A.,Brač,ko, M.,Browder, T. E.,Chang, P.,Chekelian, V.,Chen, A.,Chen, P American Physical Society 2014 PHYSICAL REVIEW D - Vol.89 No.1
Time-DependentCP-Violating Asymmetry inB0→ρ0γDecays
Ushiroda, Y.,Sumisawa, K.,Taniguchi, N.,Adachi, I.,Aihara, H.,Arinstein, K.,Aushev, T.,Bahinipati, S.,Bakich, A. M.,Balagura, V.,Barberio, E.,Belous, K.,Bitenc, U.,Bondar, A.,Bozek, A.,Brač,ko, M American Physical Society 2008 Physical Review Letters Vol.100 No.2
<P>We report the first measurement of CP-violation parameters in B0-->rho0gamma decays based on a data sample of 657x10(6)BB pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain the time-dependent and direct CP-violating parameters, Srho0gamma=-0.83+/-0.65(stat)+/-0.18(syst) and Arho0gamma=-0.44+/-0.49(stat)+/-0.14(syst), respectively.</P>
Belle Collaboration,Vinokurova, A.,Kuzmin, A.,Eidelman, S.,Arinstein, K.,Aulchenko, V.,Aushev, T.,Bakich, A.M.,Balagura, V.,Barberio, E.,Belous, K.,Bhardwaj, V.,Bondar, A.,Bozek, A.,Bracko, M.,Brodzic North-Holland Pub. Co 2011 Physics letters: B Vol.706 No.2
We report the results of a study of B<SUP>+/-</SUP>→K<SUP>+/-</SUP>η<SUB>c</SUB> and B<SUP>+/-</SUP>→K<SUP>+/-</SUP>η<SUB>c</SUB>(2S) decays followed by η<SUB>c</SUB> and η<SUB>c</SUB>(2S) decays to (K<SUB>S</SUB>Kπ)<SUP>0</SUP>. The results are obtained from a data sample containing 535 million BB@?-meson pairs collected by the Belle experiment at the KEKB e<SUP>+</SUP>e<SUP>-</SUP> collider. We measure the products of the branching fractions B(B<SUP>+/-</SUP>→K<SUP>+/-</SUP>η<SUB>c</SUB>)B(η<SUB>c</SUB>→K<SUB>S</SUB>K<SUP>+/-</SUP>π<SUP>@?</SUP>)=(26.7+/-1.4(stat)<SUB>-2.6</SUB><SUP>+2.9</SUP>(syst)+/-4.9(model))x10<SUP>-6</SUP> and B(B<SUP>+/-</SUP>→K<SUP>+/-</SUP>η<SUB>c</SUB>(2S))B(η<SUB>c</SUB>(2S)→K<SUB>S</SUB>K<SUP>+/-</SUP>π<SUP>@?</SUP>)=(3.4<SUB>-1.5</SUB><SUP>+2.2</SUP>(stat+model)<SUB>-0.4</SUB><SUP>+0.5</SUP>(syst))x10<SUP>-6</SUP>. Interference with the non-resonant component leads to significant model uncertainty in the measurement of these product branching fractions. Our analysis accounts for this interference and allows the model uncertainty to be reduced. We also obtain the following charmonia masses and widths: M(η<SUB>c</SUB>)=(2985.4+/-1.5(stat)<SUB>-2.0</SUB><SUP>+0.5</SUP>(syst)) MeV/c<SUP>2</SUP>, Γ(η<SUB>c</SUB>)=(35.1+/-3.1(stat)<SUB>-1.6</SUB><SUP>+1.0</SUP>(syst)) MeV/c<SUP>2</SUP>, M(η<SUB>c</SUB>(2S))=(3636.1<SUB>-4.2</SUB><SUP>+3.9</SUP>(stat+model)<SUB>-2.0</SUB><SUP>+0.7</SUP>(syst)) MeV/c<SUP>2</SUP>, Γ(η<SUB>c</SUB>(2S))=(6.6<SUB>-5.1</SUB><SUP>+8.4</SUP>(stat+model)<SUB>-0.9</SUB><SUP>+2.6</SUP>(syst)) MeV/c<SUP>2</SUP>.
Search for lepton-flavor and lepton-number-violating τ→@?hh<sup>'</sup> decay modes
Belle Collaboration,Miyazaki, Y.,Hayasaka, K.,Adachi, I.,Aihara, H.,Asner, D.M.,Aulchenko, V.,Aushev, T.,Bakich, A.M.,Bay, A.,Bhardwaj, V.,Bhuyan, B.,Bischofberger, M.,Bozek, A.,Bracko, M.,Browder, T. North-Holland Pub. Co 2013 Physics letters: B Vol.719 No.4
We search for lepton-flavor and lepton-number-violating τ decays into a lepton (@?= electron or muon) and two charged mesons (h,h<SUP>'</SUP>=π<SUP>+/-</SUP> or K<SUP>+/-</SUP>) using 854 fb<SUP>-1</SUP> of data collected with the Belle detector at the KEKB asymmetric-energy e<SUP>+</SUP>e<SUP>-</SUP> collider. We obtain 90% confidence level upper limits on the τ→@?hh<SUP>'</SUP> branching fractions in the range (2.0-8.4)x10<SUP>-8</SUP>. These results improve upon our previously published upper limits by factors of about 1.8 on average.
Measurement ofe+e−→Ds(*)+Ds(*)−cross sections near threshold using initial-state radiation
Pakhlova, G.,Adachi, I.,Aihara, H.,Arinstein, K.,Aushev, T.,Aziz, T.,Bakich, A. M.,Balagura, V.,Barberio, E.,Bay, A.,Belous, K.,Bhardwaj, V.,Bhuyan, B.,Bondar, A.,Bozek, A.,Brač,ko, M.,Browder, T American Physical Society 2011 PHYSICAL REVIEW D - Vol.83 No.1
Wang, M.-Z.,Abe, K.,Abe, K.,Abe, T.,Adachi, I.,Aihara, H.,Asano, Y.,Aso, T.,Aulchenko, V.,Aushev, T.,Bakich, A. M.,Bay, A.,Bizjak, I.,Bondar, A.,Bozek, A.,Brač,ko, M.,Browder, T. E.,Chang, M.-C. American Physical Society 2004 Physical Review Letters Vol.92 No.13
<P>We report the first observation of a b-->u type charmless baryonic B decay, B+-->pppi(+), as well as b-->s type B0-->ppK0 and B+-->ppK(*+) decays. The analysis is based on a 78 fb(-1) data sample recorded on the Upsilon(4S) resonance with the Belle detector at KEKB. We find B(B+-->pppi(+))=(3.06(+0.73)(-0.62)+/-0.37)x10(-6), B(B0-->ppK0)=(1.88(+0.77)(-0.60)+/-0.23)x10(-6), and B(B+-->ppK(*+))=(10.3(+3.6+1.3)(-2.8-1.7))x10(-6). We also update B(B+-->ppK+)=(5.66(+0.67)(-0.57)+/-0.62)x10(-6) and present an upper limit on B(B0-->ppK(*0)) at the 90% confidence level. A common feature of the observed decay modes is threshold peaking in baryon pair invariant mass.</P>