854 research outputs found
B decays to open and hidden charm at Belle
The recent Belle collaboration measurements of B decays to open and hidden
charm are discussed. Color-suppressed decay branching fractions are measured
with an improved accuracy. The branching fractions of the and decays, measured with improved accuracy,
and and decays,
measured for the first time, are compared. The two-body invariant masses of the
three-body and
decays are studied.Comment: 4 pages, 7 figures, proceedings submitted to the ICHEP 2004
conference, August 16-22, 2004, Beijing, Chin
B_s decays at Belle
We report recent results obtained with the Belle detector using a 23.6
fb^{-1} data sample collected on the Y(5S) resonance at the KEKB asymmetric
energy e^+ e^- collider. Inclusive semileptonic B_s^0 -> X^+ l^- \nu decays are
studied for the first time and the branching fraction is measured. Combining
the electron and muon channels, we obtain Bf(B_s^0 -> X^+ l^- \nu) = (10.2 \pm
0.8 \pm 0.9)%. Also, the radiative penguin decay B_s^0 -> \phi \gamma is
observed for the first time, and an improved upper limit for the decay B_s^0
\to \gamma \gamma is obtained.Comment: Proceedings of the EPS/HEP 2007 Conference, Manchester, England, July
2007 (on behalf of the Belle collaboration), 3 pages, 2 figure
Properties of the DsJ states
Recent measurements involving the newly discovered D_sJ particles are
reported. The results of D_sJ production and decay branching fraction
measurements are shown. Possible spin-parity and quark content assignments of
D_sJ mesons are discussed. The results are based on a large data sample
recorded by the Belle detector at the KEKB e^+ e^- collider.Comment: 4 pages, 3 figures, proceedings to the talk given on behalf of the
Belle Collaboration at the First Meeting of the APS Topical Group on Hadron
Physic
Measurement of at the 250 GeV ILC
The process with the subsequent decay of the Higgs boson is studied, where both bosons are reconstructed in the final
states with two jets. The analysis is performed using Monte Carlo data samples
obtained with detailed ILD (The International Large Detector) detector
simulation assuming an integrated luminosity of 2 ab, beam polarizations
of , and center-of-mass energy of
= 250 GeV. The analysis is repeated for the case of two 0.9 ab data
samples with polarizations .
Contributions of the potential background processes are studied using all
available ILD MC event samples. The largest background comes from the process supplemented by an energetic photon produced by initial
state radiation. To suppress this background we require that at least one of
the bosons decays to -jets. To reduce the jet reconstruction
uncertainties the variable
is used, where = 91.2 GeV. The distributions are
obtained for the studied signal and backgrounds to estimate the expected
accuracy of the measurement. The accuracy is 22
for the option of the single polarization sample described above and
deteriorate to 24 in case of the sample with two polarizations. The
proposed method can be applied at any future collider.Comment: 7 pages, 5 figures. arXiv admin note: text overlap with
arXiv:2108.0886
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