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HPLQCD

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Lattice QCD Calculations in Hadron Physics

The theory that describes interactions among elementary particles carrying the color charge (quarks and gluons) is called Quantum Chromodynamics (QCD). QCD has not been solved analytically and becomes non-perturbative at low energ... ver más

30/04/2012

CNRS

38K€

Presupuesto del proyecto: 38K€

Líder del proyecto

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE... No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Fecha límite participación Sin fecha límite de participación.

Financiación concedida El organismo FP7 notifico la concesión del proyecto el día 2012-04-30 No tenemos la información de la convocatoria

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1 Participantes

CNRS

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Líder del proyecto

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE... No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Presupuesto del proyecto 38K€

Fecha límite de participación Sin fecha límite de participación.

Descripción del proyecto The theory that describes interactions among elementary particles carrying the color charge (quarks and gluons) is called Quantum Chromodynamics (QCD). QCD has not been solved analytically and becomes non-perturbative at low energies. As a result, the quantitative prediction from first principles of much of its rich low-energy phenomenology remains a big challenge. Due to the lack of a coherent theoretical understanding of its various phenomena, hadron physics still represents an important testing ground for QCD and for flavor physics. An example are the recent measurements performed at JLAB which have shown that, in disagreement with the previous theoretical understanding, the electric and the magnetic elastic form factors have a substantially different behavior as function of the transfer four-momentum squared. In the so far most promising attempt to solve QCD at low energies, one discretizes the theory on space-time lattice and computes the functional integral by numerical Monte Carlo integration. Lattice QCD is the only known approach which allows ab-initio computations of non-perturbative quantities by keeping under control all the systematic errors. Recent advances in simulation algorithms now allow simulations with light sea quarks (corresponding to pion masses as small as 250 MeV) where contact with the chiral effective theory can be made. This is thus the right moment to tackle various problems of hadron physics in order to obtain the first model-independent results. With this project, we propose the use of the latest available techniques to simulate lattice QCD at small quark mass together with the chiral effective theory in order to study some subjects of particular interests for hadron physics, namely (i) the spectroscopy of ground and excited baryon (octet and decuplet) states, (ii) hadron-hadron scattering lengths, (iii) the investigation of baryon structure through form factors, parton distribution functions and generalized parton distributions.

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