Measurement of masses and branching ratios of Xi(+)(c) and Xi(0)(c) baryons
Reference EPFL-ARTICLE-154475doi:10.1016/j.physletb.2004.11.038View record in Web of Science Record created on 2010-11-05, modified on 2017-05-12

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

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

title: Observation of B ---> phi phi K Decays

title: Improved measurement of Anti-B0 ---> D(s)- D+ and search for anti-B0 ---> D(s)+ D(s)- at BELLE

title: Observation of B0 ---> a+-(1) (1260) pi-+

title: The production percentages of L = 1 baryons in e+ e- annihilation

title: PROBING COLOUR SEPARATE SINGLET STATES IN E+E- ANNIHILATION AT Z0 POLE

title: Production percentages of excited baryons in e+e- annihilation
abstract: Two relations between the production weights for octet, decuplet (including both the ground and excited states) and singlet baryons are derived using the properties of hadronization in the stochastic quark combination scheme. From the basic relations, it is easy to understand the "spin suppression" phenomenon and the reason why singlet baryons have high multiplicities. A method for estimating the production percentages of the lowest excited baryons is given.

title: Fragmentation of Light Initial Quarks into Charm Measons in e~+ e~- Annihilation
abstract: We study the process that the light initial quarks produced in e+ e- annihilation combine with the c from glu-on splitting to form D's (D-+D6-+D0) or D 's(D-*+ Ds*-+D*0). The 'light + heavy' bound state is described by light-cone wavefunction. The contribution of this process to D (D ) production at Z0 pole is much larger compared with that in lower energies (e.g. 10.6GeV) . For this special process, the invariant mass of D(D ) and the charm had-ron fragmented from the c quark has a unique spectrum which peaks near 2 MB if we constrain the D(D*) from all processes with energy larger than 20GeV. It is also noticeable that the produced D* in this process is dominantly longitudinally polarized, which is consistent with the OPAL data.

title: e+ e- --> Z0 Z0 --> b anti-b c anti-c events as model independent probe of color reconnection effects
abstract: According to the basic properties of QCD, colour reconnection effects can occur in hadronic processes at high energies. The comparison of $e^{+}e^{-}\to Z^0Z^0\to q\bar{q}q'\bar{q'}$ events with the superposition of $Z^0\to q\bar{q}$ and $Z^0\to q'\bar{q'}$ events from LEP1 would provide an unambiguous model-independent probe. We show that at LEP2 energy, the background processes are negligible if we select only $e^{+}e^{-}\to Z^0Z^0\to b \bar{b}c\bar{c}$ events, and limit the measurements in the phase space of on-shell $Z^0Z^0$ events.