LATQCD-CHIPT

Probing Chiral Perturbation Theory from realistic two-flavour Lattice QCD simulations

Coordinatore	EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH    more  Organization address address: ROUTE DE MEYRIN CERN city: GENEVA 23 postcode: 1211 contact info Titolo: Mr. Nome: Seamus Cognome: Hegarty Email: send email Telefono: +41 22 767 27 55 Fax: +41 22 766 88 41
Nazionalità Coordinatore	Switzerland [CH]
Totale costo	0 €
EC contributo	137˙449 €
Programma	FP7-PEOPLE Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
Code Call	FP7-PEOPLE-IEF-2008
Funding Scheme	MC-IEF
Anno di inizio	2009
Periodo (anno-mese-giorno)	2009-03-01   -   2010-08-31

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH  Organization address address: ROUTE DE MEYRIN CERN city: GENEVA 23 postcode: 1211 contact info Titolo: Mr. Nome: Seamus Cognome: Hegarty Email: send email Telefono: +41 22 767 27 55 Fax: +41 22 766 88 41	CH (GENEVA 23)	coordinator	137˙449.77

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 Obiettivo del progetto (Objective)

'Research objectives and content: we propose to apply recently developed non-perturbative techniques for the simulation of two-flavour QCD with sea quark masses at physical values in order to investigate the convergence properties of Chiral Perturbation Theory (ChiPT) in pi-pi scattering and other light-quark physics quantities. Our approach is based on the Wilson formulation of the fermionic QCD action and an original modification of the Domain Decomposition Hybrid Monte Carlo (DD-HMC) algorithm. Target observables are: pi-pi scattering lenghts, pion mass, pion decay constant, other channels of the light-hadron spectrum. As a result, we expect to find conclusive quantitative information concerning the convergence radius of the chiral expansion and to consequently improve the understanding of the sponaneous breaking of chiral symmetry. Methodology: the main obstacle to simulate light-quarks at physical masses is represented by instability and non-ergodicity phenomena in the HMC, related to the structure of the low-end of the Wilson-Dirac spectrum. We propose to adopt a modification of the algorithm where the low-modes are separated from the bulk of the modes and included in a reweighting factor. Training: the candidate would like to acquire and deepen technical skills and knowledge in the areas of : a) Chiral Perturbation Theory; b) phenomenology of the light hadron interactions; c) Monte Carlo simulations of lattice QCD; d) Parallel computing.'