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Início
Agenda |
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- 14 de maio de 2014
16h30
Sala F-210 -
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Benoit Blossier
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Uni. Paris Sud
B
physics and lattice QCD simulations
Now
that the amount of available experimental data is large as far
as beauty physics is
concerned, especially from LHC and B
factories, precision tests of the Standard Model
and trials of
several New Physics scenarios are feasible in that area of
flavour physics. Unfortunately the theoretical uncertainty,
mainly coming from hardly computable long-distance effects of
the strong interaction that confines quarks and gluons within
hadrons, is potentially limiting the impact of future
experimental measurements on New Physics models.
Lattice QCD
offers a powerful approach to compute these non-perturbative
hadronic
contributions; however some care is needed to obtain
reliable results for b quark physics because one has to keep
under control simultaneously the finite-size effects and the
discretisation effects that are particularly severe when such a
heavy quark is simulated.
After having introduced the main
features of lattice QCD and hints of heavy flavour physics,
I
will present a strategy to deal with the heavy quark on the
lattice: it is based on Heavy Quark Effective Theory, paying
attention to excited states, and illustrate it on a recent
measurement of the b quark mass and the B meson decay constant. -
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