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K ->pi pi amplitudes from lattice QCD with a light charm quark

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K ->pi pi amplitudes from lattice QCD with a light charm quark

dc.contributor.author	Giusti, L.
dc.contributor.author	Hernández Gamazo, Pilar
dc.contributor.author	Laine, Mikko
dc.contributor.author	Pena Ruano, Carlos
dc.contributor.author	Wennekers, Jan
dc.contributor.author	Wittig, Hartmut
dc.date.accessioned	2015-04-23T12:31:33Z
dc.date.available	2015-04-23T12:31:33Z
dc.date.issued	2007
dc.identifier.uri	http://hdl.handle.net/10550/43338
dc.description.abstract	We compute the leading-order low-energy constants of the DeltaS=1 effective weak Hamiltonian in the quenched approximation of QCD with up, down, strange, and charm quarks degenerate and light. They are extracted by comparing the predictions of finite volume chiral perturbation theory with lattice QCD computations of suitable correlation functions carried out with quark masses ranging from a few MeV up to half of the physical strange mass. We observe a large DeltaI=1/2 enhancement in this corner of the parameter space of the theory. Although matching with the experimental result is not observed for the DeltaI=1/2 amplitude, our computation suggests large QCD contributions to the physical DeltaI=1/2 rule in the GIM limit, and represents the first step to quantify the role of the charm quark-mass in K-->pipi amplitudes.
dc.language.iso	eng
dc.relation.ispartof	Physical Review Letters, 2007, vol. 98, num. 8, p. 082003-1-082003-4
dc.source	Giusti, L. Hernández Gamazo, Pilar Laine, Mikko Pena Ruano, Carlos Wennekers, Jan Wittig, Hartmut 2007 K ->pi pi amplitudes from lattice QCD with a light charm quark Physical Review Letters 98 8 082003-1 082003-4
dc.subject	Física
dc.title	K ->pi pi amplitudes from lattice QCD with a light charm quark
dc.type	journal article	es_ES
dc.date.updated	2015-04-23T12:31:33Z
dc.identifier.doi	http://dx.doi.org/10.1103/PhysRevLett.98.082003
dc.identifier.idgrec	043134
dc.rights.accessRights	open access	es_ES