50 research outputs found
Dynamical lattice computation of the Isgur-Wise functions τ1/2 and τ3/2
We perform a two-flavor dynamical lattice computation of the Isgur-Wise functions t1/2 and t3/2
at zero recoil in the static limit. We find t1/2(1) = 0.297(26) and t3/2(1) = 0.528(23) fulfilling
Uraltsev’s sum rule by around 80%. We also comment on a persistent conflict between theory and
experiment regarding semileptonic decays of B mesons into orbitally excited P wave D mesons,
the so-called “1/2 versus 3/2 puzzle”, and we discuss the relevance of lattice results in this
context
Renormalization of quark propagator, vertex functions and twist-2 operators from twisted-mass lattice QCD at =4
We present a precise non-perturbative determination of the renormalization
constants in the mass independent RI'-MOM scheme. The lattice implementation
uses the Iwasaki gauge action and four degenerate dynamical twisted mass
fermions. The gauge configurations are provided by the ETM Collaboration.
Renormalization constants for scalar, pseudo-scalar, vector and axial
operators, as well as the quark propagator renormalization, are computed at
three different values of the lattice spacing, two volumes and several twisted
mass parameters. The method we developed allows for a precise cross-check of
the running, thanks to the particular proper treatment of hypercubic artifacts.
Results for the twist-2 operator are also presented.Comment: 20 pages, 20 figures, submitted to Phys. Rev.
Renormalization constants for twisted mass QCD
We summarize recent non-perturbative results obtained for the renormalization
constants computed in the RI'-MOM scheme for twisted mass
QCD. Our implementation employs the Iwasaki gauge action and four dynamical
degenerate twisted mass fermions. Renormalization constants for scalar,
pseudo-scalar, vector and axial operators, as well as the quark propagator
renormalization, are computed at three different values of the lattice spacing,
two different volumes and several values of the twisted mass. Our method allows
for a precise cross-check of the running, because of the particular proper
treatment of the hypercubic artifacts. Preliminary results for twist-2
operators are also presented
Baryon masses with dynamical twisted mass fermions
We present results on the mass of the nucleon and the using two
dynamical degenerate twisted mass quarks. The evaluation is performed at four
quark masses corresponding to a pion mass in the range of 690-300 MeV on
lattices of size 2.1 fm and 2.7 fm. We check for cutoff effects by evaluating
these baryon masses on lattices of spatial size 2.1 fm with lattice spacings
fm and fm, determined from
the pion sector and find them to be within our statistical errors. Lattice
results are extrapolated to the physical limit using continuum chiral
perturbation theory.
The nucleon mass at the physical point provides a determination of the
lattice spacing. Using heavy baryon chiral perturbation theory at we find fm, with a systematic error due to
the chiral extrapolation estimated to be about the same as the statistical
error. This value of the lattice spacing is in good agreement with the value
determined from the pion sector. We check for isospin breaking in the
-system. We find that and are almost
degenerate pointing to small flavor violating effects.Comment: 7 pages, 9 figures. Talk presented at the XXV International Symposium
on Lattice Field Theory, July 30 - August 4 2007, Regensburg, German
Automated Code Generation for Lattice QCD Simulation
Quantum Chromodynamics (QCD) is the theory of strong nuclear force, responsible of the interactions between sub-nuclear particles. QCD simulations are typically performed through the lattice gauge theory approach, which provides a discrete analytical formalism called LQCD (Lattice Quantum Chromodynamics). LQCD simulations usually involve generating and then processing data on petabyte scale which demands multiple teraflop-years on supercomputers. Large parts of both, generation and analysis, can be reduced to the inversion of an extremely large matrix, the so-called Wilson-Dirac operator. For this purpose, and because this matrix is always sparse and structured, iterative methods are definitely considered. Therefore, the procedure of the application of this operator, resulting in a vector-matrix product, appears as a critical computation kernel that should be optimized as much as possible. Evaluating the Wilson-Dirac operator involves symmetric stencil calculations where each node has 8 neighbors. Such configuration is really hindering when it comes to memory accesses and data exchanges among processors. For current and future generation of supercomputers the hierarchical memory structure make it next to impossible for a physicist to write an efficient code. Addressing these issues in other to harvest an acceptable amount of computing cycles for the real need, which means reaching a good level of efficiency, is the main concern of this paper. We present here a Domain Specific Language and corresponding toolkit, called QIRAL, which is a complete solution from symbolic notation to simulation code
Possible explanation of the discrepancy of the light-cone QCD sum rule calculation of g(D*Dpi) coupling with experiment
The introduction of an explicit negative radial excitation contribution in
the hadronic side of the light cone QCD sum rule (LCSR) of Belyaev, Braun,
Khodjamirian and Ruckl, can explain the large experimental value of g(D*Dpi),
recently measured by CLEO. At the same time, it considerably improves the
stability of the sum rule when varying the Borel parameter.Comment: 9 pages, 1 PostScript figure
Écrits, écriture en contexte de travail
Le service d'enseignement Culture et Communication du C.N.A.M.-Paris (Conservatoire National des Arts et Métiers) et GERICO-Lille 3 (Groupe d'Equipes de Recherche en Information et Communication), équipe d'accueil, s'associent pour l'organisation d'un groupe de travail. Le thème de recherche en est, cette année 1993-1994, Ecrits et écriture en contexte de travail. Quatre journées sont organisées tantôt au C.N.A.M., tantôt dans les locaux de l'I. U.P. « Information Communication » de l'Univers..
Direct admission to the intensive care unit from the emergency department and mortality in critically ill hematology patients
Background: The aim of this study was to assess the benefit of direct ICU admission from the emergency department (ED) compared to admission from wards, in patients with hematological malignancies requiring critical care.
Methods: Post hoc analysis derived from a prospective, multicenter cohort study of 1011 critically ill adult patients with hematologic malignancies admitted to 17 ICU in Belgium and France from January 2010 to May 2011. The variable of interest was a direct ICU admission from the ED and the outcome was in-hospital mortality. The association between the variable of interest and the outcome was assessed by multivariable logistic regression after multiple imputation of missing data. Several sensitivity analyses were performed: complete case analysis, propensity score matching and multivariable Cox proportional-hazards analysis of 90-day survival.
Results: Direct ICU admission from the ED occurred in 266 (26.4%) cases, 84 of whom (31.6%) died in the hospital versus 311/742 (41.9%) in those who did not. After adjustment, direct ICU admission from the ED was associated with a decreased in-hospital mortality (adjusted OR: 0.63; 95% CI 0.45-0.88). This was confirmed in the complete cases analysis (adjusted OR: 0.64; 95% CI 0.45-0.92) as well as in terms of hazard of death within the 90 days after admission (adjusted HR: 0.77; 95% CI 0.60-0.99). By contrast, in the propensity score-matched sample of 402 patients, direct admission was not associated with in-hospital mortality (adjusted OR: 0.92; 95% CI 0.84-1.01).
Conclusions: In this study, patients with hematological malignancies admitted to the ICU were more likely to be alive at hospital discharge if they were directly admitted from the ED rather than from the wards. Assessment of early predictors of poor outcome in cancer patients admitted to the ED is crucial so as to allow early referral to the ICU and avoid delays in treatment initiation and mis-orientation
Divergent IR gluon propagator from Ward-Slavnov-Taylor identities?
We exploit the Ward-Slavnov-Taylor identity relating the 3-gluons to the
ghost-gluon vertices to conclude either that the ghost dressing function is
finite and non vanishing at zero momentum while the gluon propagator diverges
(although it may do so weakly enough not to be in contradiction with current
lattice data) or that the 3-gluons vertex is non-regular when one momentum goes
to zero. We stress that those results should be kept in mind when one studies
the Infrared properties of the ghost and gluon propagators, for example by
means of Dyson-Schwinger equations.Comment: 6 pages, bibte
Non-perturbative Power Corrections to Ghost and Gluon Propagators
We study the dominant non-perturbative power corrections to the ghost and
gluon propagators in Landau gauge pure Yang-Mills theory using OPE and lattice
simulations. The leading order Wilson coefficients are proven to be the same
for both propagators. The ratio of the ghost and gluon propagators is thus free
from this dominant power correction. Indeed, a purely perturbative fit of this
ratio gives smaller value (MeV) of \Lambda_{\ms} than the one
obtained from the propagators separately(MeV). This argues in
favour of significant non-perturbative power corrections in the
ghost and gluon propagators. We check the self-consistency of the method.Comment: 14 pages, 4 figures; replaced with revised version, to appear in JHE