T. Aushev

Observation of Transverse Polarization Asymmetries of Charged Pion Pairs in e+e- Annihilation near √[s]= 10.58 GeV

The interference fragmentation function translates the fragmentation of a quark with a transverse projection of the spin into an azimuthal asymmetry of two final-state hadrons. In e(+)e(-) annihilation the product of two interference fragmentation functions is measured. We report nonzero asymmetries for pairs of charge-ordered π(+)π(-) pairs, which indicate a significant interference fragmentation function in this channel. The results are obtained from a 672 fb(-1) data sample that contains 711 × 10(6) π(+)π(-) pairs and was collected at and near the Υ(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider.

First observation of the decay τ−→ϕK−νττ−→ϕK−ντ

We present the first measurement of tau-decays to hadronic final states with a

Observation of New States Decaying into {lambda}{sub c}{sup +}K{sup -}{pi}{sup +} and {lambda}{sub c}{sup +}K{sub S}{sup 0}{pi}{sup -}

\phi

Observation of B{sup +}{yields}{xi}{sub c}{sup 0}{lambda}{sub c}{sup +} and evidence for B{sup 0}{yields}{xi}{sub c}{sup -}{lambda}{sub c}{sup +}

-meson. This is based on 401.4 fb

Charm hadrons from fragmentation and B decays in e{sup +}e{sup -} annihilation at {radical}(s)=10.6 GeV

^{-1}

Measurement of the branching fractions for B{sup -}{yields}D{sup (*)+}{pi}{sup -}l{sup -}{nu}{sub l} and B{sup 0}{yields}D{sup (*)0}{pi}{sup +}l{sup -}{nu}{sub l}

of data accumulated at the Belle experiment. The branching ratio obtained is

Study of τ−→KSπ−νττ−→KSπ−ντ decay at Belle

B(\tau^{\pm}\to\phi K^{\pm}\nu) = (4.06\pm 0.25\pm 0.26)\times 10^{-5}

Search for CP Violation in the Decays DK{sub S}P

.We present the first observation of tau lepton decays to hadronic final states with a phi-meson. This analysis is based on 401 fb^-1 of data accumulated at the Belle experiment. The branching fraction obtained is B(tau- -> phi K- nu) = (4.05 +- 0.25 +- 0.26) x 10^-5.

Observation of B{sub s}°J/f(980) and Evidence for B{sub s}°J/f(1370)

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 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).Reference EPFL-ARTICLE-154577doi:10.1103/PhysRevLett.97.162001View record in Web of Science Record created on 2010-11-05, modified on 2017-05-12We report the first observation of two charmed strange baryons that decay into {lambda}{sub c}{sup +}K{sup -}{pi}{sup +}. The broader of the two states is measured to have a mass of 2978.5{+-}2.1{+-}2.0 MeV/c{sup 2} and a width of 43.5{+-}7.5{+-}7.0 MeV/c{sup 2}. The mass and width of the narrow state are measured to be 3076.7{+-}0.9{+-}0.5 MeV/c{sup 2} and 6.2{+-}1.2{+-}0.8 MeV/c{sup 2}, respectively. We also perform a search for the isospin partner states that decay into {lambda}{sub c}{sup +}K{sub S}{sup 0}{pi}{sup -} and observe a significant signal at the mass of 3082.8{+-}1.8{+-}1.5 MeV/c{sup 2}. The data used for this analysis were accumulated at or near the {upsilon}(4S) resonance, using the Belle detector at the e{sup +}e{sup -} asymmetric-energy collider KEKB. The integrated luminosity of the data sample used is 461.5 fb{sup -1}.

Study of the K{sup +}Ï{sup +}Ïâ» final state in B{sup +}âJ/ÏK{sup +}Ï{sup +}Ïâ» and B{sup +}âÏ'K{sup +}Ï{sup +}Ïâ»

We report the first observation of the decay B{sup +}{yields}{xi}{sub c}{sup 0}{lambda}{sub c}{sup +} with a significance of 8.7{sigma} and evidence for the decay B{sup 0}{yields}{xi}{sub c}{sup -}{lambda}{sub c}{sup +} with a significance of 3.8{sigma}. The product B(B{sup +}{yields}{xi}{sub c}{sup 0}{lambda}{sub c}{sup +})xB({xi}{sub c}{sup 0}{yields}{xi}{sup +}{pi}{sup -}) is measured to be (4.8{sub -0.9}{sup +1.0}{+-}1.1{+-}1.2)x10{sup -5}, and B(B{sup 0}{yields}{xi}{sub c}{sup -}{lambda}{sub c}{sup +})xB({xi}{sub c}{sup -}{yields}{xi}{sup +}{pi}{sup -}{pi}{sup -}) is measured to be (9.3{sub -2.8}{sup +3.7}{+-}1.9{+-}2.4)x10{sup -5}. The errors are statistical, systematic and the error of the {lambda}{sub c}{sup +}{yields}pK{sup -}{pi}{sup +} branching fraction, respectively. The decay B{sup +}{yields}{xi}{sub c}{sup 0}{lambda}{sub c}{sup +} is the first example of a two-body exclusive B{sup +} decay into two charmed baryons. The data used for this analysis was accumulated at the {upsilon}(4S) resonance, using the Belle detector at the e{sup +}e{sup -} asymmetric-energy collider KEKB. The integrated luminosity of the data sample is equal to 357 fb{sup -1}, corresponding to 386x10{sup 6} BB pairs.Reference EPFL-ARTICLE-154546doi:10.1103/PhysRevD.74.111105Afficher la publication dans Web of Science Notice creee le 2010-11-05, modifiee le 2017-05-12