246 research outputs found
Partially quenched chiral perturbation theory in the epsilon regime at next-to-leading order
We calculate the partition function of partially quenched chiral perturbation
theory in the epsilon regime at next-to-leading order using the supersymmetry
method in the formulation without a singlet particle. We include a nonzero
imaginary chemical potential and show that the finite-volume corrections to the
low-energy constants and for the partially quenched partition
function, and hence for spectral correlation functions of the Dirac operator,
are the same as for the unquenched partition function. We briefly comment on
how to minimize these corrections in lattice simulations of QCD. As a side
result, we show that the zero-momentum integral in the formulation without a
singlet particle agrees with previous results from random matrix theory.Comment: 19 pages, 4 figures; minor changes, to appear in JHE
Finite Volume Scaling of Pseudo Nambu-Goldstone Bosons in QCD
We consider chiral perturbation theory in a finite volume and in a mixed
regime of quark masses. We take N_l light quarks near the chiral limit, in the
so-called epsilon-regime, while the remaining N_h quarks are heavier and in the
standard p-regime. We compute in this new mixed regime the finite-size scaling
of the light meson correlators in the scalar, pseudoscalar, vector and axial
vector channels.Using the replica method, we easily extend our results to the
partially quenched theory. With the help of our results, lattice QCD
simulations with 2+1 flavors can safely investigate pion physics with very
light up and down quark masses even in the region where the pion's correlation
length overcomes the size of the space-time lattice.Comment: 32 pages, 6 figures, published versio
Mixed action computations on fine dynamical lattices
We report on our first experiences in simulating Neuberger valence fermions
on CLS configurations with light sea quark masses and small lattice
spacings. Valence quark masses are considered that allow to explore the
matching to (partially quenched) chiral perturbation theory both in the
- and -regimes. The setup is discussed, and first results are
presented for spectral observables.Comment: 7 pages. Presented at the XXVII International Symposium on Lattice
Field Theory, July 26-31, 2009, Peking University, Beijing, Chin
The Chiral Condensate in a Finite Volume
Chiral perturbation theory at finite four-volume V (=L^3T) is reconsidered
with a view towards finding a computational scheme that can deal with any value
of M_\pi L, where M_\pi is a generic Nambu-Goldstone mass. The momentum zero
modes that cause the usual p-expansion to fail in the chiral limit are treated
separately, and partly integrated out to all orders. In this way the theory
remains infrared finite in the perturbative expansion, and the chiral limit can
be considered at finite volume. We illustrate the technique by computing the
quark condensate in a finite volume, smoothly connecting standard results in
the p-regime for larger masses with those of the epsilon-regime for smaller
masses. From the partially quenched theory we also obtain the spectral density
of the Dirac operator, a smooth function from the microscopic region to the
bulk region of the p-regime.Comment: 33 pages, 10 figures, corrections in (4.7), (6.5), (6.8), additional
comment on (3.16
The reticulons: guardians of the structure and function of the endoplasmic reticulum
The endoplasmic reticulum (ER) consists of the nuclear envelope and a peripheral network of tubules and membrane sheets. The tubules are shaped by a specific class of curvature stabilizing proteins, the reticulons and DP1; however it is still unclear how the sheets are assembled. The ER is the cellular compartment responsible for secretory and membrane protein synthesis. The reducing conditions of ER lead to the intra/inter-chain formation of new disulphide bonds into polypeptides during protein folding assessed by enzymatic or spontaneous reactions. Moreover, ER represents the main intracellular calcium storage site and it plays an important role in calcium signaling that impacts many cellular processes. Accordingly, the maintenance of ER function represents an essential condition for the cell, and ER morphology constitutes an important prerogative of it. Furthermore, it is well known that ER undergoes prominent shape transitions during events such as cell division and differentiation. Thus, maintaining the correct ER structure is an essential feature for cellular physiology. Now, it is known that proper ER-associated proteins play a fundamental role in ER tubules formation. Among these ER-shaping proteins are the reticulons (RTN), which are acquiring a relevant position. In fact, beyond the structural role of reticulons, in very recent years new and deeper functional implications of these proteins are emerging in relation to their involvement in several cellular processes
Finite-size scaling for the left-current correlator with non-degenerate quark masses
We study the volume dependence of the left-current correlator with
non-degenerate quark masses to next-to-leading order in the chiral expansion.
We consider three possible regimes: all quark masses are in the
-regime, all are in the -regime and a mixed-regime where the
lighest quark masses satisfy while the heavier . These results can be used to match lattice QCD and the Chiral
Effective Theory in a large but finite box in which the Compton wavelength of
the lightest pions is of the order of the box size. We consider both the full
and partially-quenched results.Comment: 27 pages, 4 figure
B-physics with Wilson fermions
We report the final results of the ALPHA collaboration for some B-physics
observables: , and . We employ CLS configurations with 2
flavors of improved Wilson fermions in the sea and pion masses ranging
down to 190 MeV. The b-quark is treated in HQET to order . The
renormalization, the matching and the improvement were performed
non-perturbatively, and three lattice spacings reaching fm are used
in the continuum extrapolation
Finite size scaling of meson propagators with isospin chemical potential
We determine the volume and mass dependence of scalar and pseudoscalar two-point functions in N_f-flavour QCD, in the presence of an isospin chemical potential and at fixed gauge-field topology. We obtain these results at second order in the \epsilon-expansion of Chiral Perturbation Theory and evaluate all relevant zero-mode group integrals analytically. The virtue of working with a non-vanishing chemical potential is that it provides the correlation functions with a dependence on both the chiral condensate, \Sigma, and the pion decay constant, F, already at leading order. Our results may therefore be useful for improving the determination of these constants from lattice QCD calculations. As a side product, we rectify an earlier calculation of the O(\epsilon^2) finite-volume correction to the decay constant appearing in the partition function. We also compute a generalised partition function which is useful for evaluating U(N_f) group integrals
Decay constants of B-mesons from non-perturbative HQET with two light dynamical quarks
We present a computation of B-meson decay constants from lattice QCD
simulations within the framework of Heavy Quark Effective Theory for the
b-quark. The next-to-leading order corrections in the HQET expansion are
included non-perturbatively. Based on Nf=2 gauge field ensembles, covering
three lattice spacings a (0.08-0.05)fm and pion masses down to 190MeV, a
variational method for extracting hadronic matrix elements is used to keep
systematic errors under control. In addition we perform a careful
autocorrelation analysis in the extrapolation to the continuum and to the
physical pion mass limits. Our final results read fB=186(13)MeV, fBs=224(14)MeV
and fBs/fB=1.203(65). A comparison with other results in the literature does
not reveal a dependence on the number of dynamical quarks, and effects from
truncating HQET appear to be negligible.Comment: 16 pages including figures and table
The b-quark mass from non-perturbative Heavy Quark Effective Theory at
We report our final estimate of the b-quark mass from lattice QCD
simulations using Heavy Quark Effective Theory non-perturbatively matched to
QCD at . Treating systematic and statistical errors in a conservative
manner, we obtain GeV after an extrapolation to the physical point.Comment: 15 pages including figures and tables; as published in Phys.Lett.B /
typo in table 4 corrected / footnote 1 expande
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