12,494 research outputs found
Determination of the CKM Matrix Element |V_cb| from Semileptonic B Decays
We report studies of semileptonic decays, B --> X_c l nu, based on a sample
of 88 million BB events recorded with the BABAR detector. We have measured four
moments of the electron energy distribution and four moments of the hadronic
mass distribution, each as a function of the minimum electron energy. From
these moments we determine the inclusive branching fraction, the CKM matrix
element |V_cb|, and other heavy quark parameters, using Heavy Quark Expansions
(HQE) to order 1/m_b^3 in the kinetic mass scheme. In addition, we have studied
a large sample of exclusive B^0 --> D^*- l^+ nu decays. This sample is used to
extract the vector and axial form factors, the normalization and slope of the
HQET form factor to determine |V_cb|.Comment: 7 pages, 3 postscript figues, Talk presented at ICHEP04 in Beijin
The High Energy Radiation Pattern from BFKLex
We discuss a recent study on high-energy jet production in the multi-Regge
limit done with the use of the Monte Carlo event generator BFKLex which
includes collinear improvements in the form of double-log contributions. We
will show results for the average transverse momentum and azimuthal angle of
the final state jets when at least one of them is very forward in rapidity and
another one is very backward. We also discuss the introduction of a new
observable which accounts for the average rapidity ratio among subsequent
emissions.Comment: 6 pages, presented by G. Chachamis at the XXIV International Workshop
on Deep-Inelastic Scattering and Related Subjects, 11-15 April 2016, DESY
Hamburg, German
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