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SUMMARY:Probing $N_f=2$ chiral dynamics with topological zero-modes in the
mixed chiral regim
DTSTART;VALUE=DATE-TIME:20120514T140000Z
DTEND;VALUE=DATE-TIME:20120514T142500Z
DTSTAMP;VALUE=DATE-TIME:20181219T122026Z
UID:indico-contribution-38792@indico.in2p3.fr
DESCRIPTION:Speakers: Gregory Vulvert (IFIC Valencia)\nLattice QCD benefit
s nowadays from numerous progess thanks to algorithmic enhancements to pus
h down the quark masses to reach the physical masses and to increase the l
attice geometry to avoid finite volume effects. However using fermions whi
ch do not break the chiral symmetry both in valence and sea sector is stil
l a challenge. An alternative is to consider mixed action simulations\, wh
ere one uses for example Ginsparg-Wilson respecting chiral symmetry to des
cribe the valence quark whereas the sea is described by Wilson fermions\,
which break chiral symmetry and which are numerically cheaper but even in
this case\, using large volumes do avoid finite-volume effects is rather e
xpensive.\nChiral perturbation theory (ChPT) can be done in finite-volume
so that it can take into account the finite-volume effects. But we can use
quarks that do not belong to the same chiral regime : some quarks can be
in the so-called epsilon regime of ChPT which allows to compute large fini
te-size effects while other quarks are in the usual p regime. We thus cons
ider a theory with $N_v$ quarks in the epsilon regime and $N_s$ quarks in
the p-regime. These results can be used to match lattice QCD and the chira
l effective theory in a large but finite box in which the Compton waveleng
th of the lightest pions is of the order of the box size. This approach al
lows us to test the chiral regime. I will present some results obtained in
the case of the PP correlator.\n\nhttps://indico.in2p3.fr/event/6635/cont
ributions/38792/
LOCATION:UM2 Amphi IAE\, bât. 29
URL:https://indico.in2p3.fr/event/6635/contributions/38792/
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