691 research outputs found
Heavy Quark Spin Symmetry and Heavy Baryons: Electroweak Decays
Heavy quark spin symmetry is discussed in the context of single and doubly
heavy baryons. A special attention is paid to the constraints/simplifications
that this symmetry imposes on the non-relativistic constituent quark model wave
functions and on the b->c semileptonic decays of these hadrons.Comment: Presented at the 21st European Conference on Few-Body Problems in
Physics, Salamanca, Spain, 30 August - 3 September 201
Hyperfine mixing in electromagnetic decay of doubly heavy baryons
We investigate the role of hyperfine mixing in the electromagnetic decay of
ground state doubly heavy baryons. As in the case of a previous
calculation on semileptonic decays of doubly heavy baryons, we find
large corrections to the electromagnetic decay widths due to this mixing.
Contrary to the weak case just mentioned, we find here that one can not use
electromagnetic width relations obtained in the infinite heavy quark mass limit
to experimentally extract information on the admixtures in a model independent
way.Comment: 9 Latex pages, 4 tables. A new reference added. A few misprints
correcte
The role of hyperfine mixing in semileptonic decays of doubly-heavy baryons
We analyze the effects of hyperfine mixing in semileptonic decays
of doubly heavy baryons. We qualitatively confirm the results by W. Roberts and
M. Pervin in Int. J. Mod. Phys. A, 2009, {\bf 24}: 2401-2413, finding that
mixing has a great impact on those transitions. However, predictions without
mixing differ by a factor of 2 and this discrepancy translates to the mixed
case where large differences in decay widths are observed between the two
calculations.Comment: 3 latex pages. Talk given at The 5-th International Conference on
Quarks and Nuclear Physics (QNP09), Beijing, September 200
Hyperfine mixing in semileptonic decay of doubly heavy baryons
We qualitatively corroborate the results of W. Roberts and M. Pervin in Int.
J. Mod. Phys. A 24, 2401 (2009) according to which hyperfine mixing greatly
affects the decay widths of semileptonic decays involving doubly heavy
baryons. However, our predictions for the decay widths of the unmixed
states differ from those reported in the work of Roberts and Pervin by a factor
of 2, and this discrepancy translates to the mixed case. We further show that
the predictions of heavy quark spin symmetry, might be used in the future to
experimentally extract information on the admixtures in the actual physical
baryons, in a model independent manner.Comment: 7 Latex pages, 4 Table
The effect of hyperfine mixing in electromagnetic and semileptonic decays of doubly heavy baryons
We consider the role played by hyperfine mixing in electromagnetic and
semileptonic decays of doubly heavy baryons, which give rise to large
corrections to the decay widths in both cases.Comment: Talk given in Quark Confinement and the Hadron Spectrum IX, Madrid
September 201
The role of hyperfine mixing in semileptonic and electromagnetic decays of doubly-heavy baryons
We analyze the effects of hyperfine mixing in semileptonic and
electromagnetic decays of doubly heavy baryons.Comment: Talk given at the Chiral 10 Conferenc
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