43 research outputs found
Search for Violation and Measurement of the Branching Fraction in the Decay
We report a study of the decay using 921~fb of
data collected at or near the and resonances with
the Belle detector at the KEKB asymmetric energy collider. The
measured time-integrated asymmetry is , and the branching fraction is
= (1.321 0.023
0.036 0.044) 10, where the first uncertainty is
statistical, the second is systematic, and the third is due to the
normalization mode (). These results are significantly
more precise than previous measurements available for this mode. The
measurement is consistent with the standard model expectation.Comment: 7 pages,1 figure, Submitted to PR
Angular analysis of
We present a measurement of angular observables, , , ,
, in the decay , where
is either or . The analysis is performed on
a data sample corresponding to an integrated luminosity of
containing pairs, collected
at the resonance with the Belle detector at the
asymmetric-energy collider KEKB. Four angular observables,
are extracted in five bins of the invariant mass squared of the
lepton system, . We compare our results for with Standard
Model predictions including the region in which the LHCb collaboration
reported the so-called anomaly.Comment: Conference paper for LHC Ski 2016. SM prediction for
corrected and reference for arXiv:1207.2753 adde
The impact of Natura 2000 on forest management: a socio-ecological analysis in the continental region of the European Union
Search for violation and measurement of the branching fraction in decay
We report a study of the decay using 921~fb of data collected at or near the and resonances with the Belle detector at the KEKB asymmetric-energy collider. The measured time-integrated CP asymmetry is and the branching fraction is = (1.32 0.02 0.04 0.04) 10, where the first uncertainty is statistical, the second is systematic, and the third is due to the normalization mode () used in the analysis. These results are significantly more precise than previous measurements for this mode. The measurement is consistent with the Standard Model expectation
Measurement of the decay in fully reconstructed events and determination of the Cabibbo-Kobayashi-Maskawa matrix element
We present a determination of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element using the decay () based on 711 fb of data recorded by the Belle detector and containing pairs. One meson in the event is fully reconstructed in a hadronic decay mode while the other, on the signal side, is partially reconstructed from a charged lepton and either a or meson in a total of 23 hadronic decay modes. The isospin-averaged branching fraction of the decay is found to be . Analyzing the differential decay rate as a function of the hadronic recoil with the parameterization of Caprini, Lelouch and Neubert and using the form-factor prediction calculated by FNAL/MILC, we obtain , where is the electroweak correction factor. Alternatively, assuming the model-independent form-factor parameterization of Boyd, Grinstein and Lebed and using lattice QCD data from the FNAL/MILC and HPQCD collaborations, we find