We study the flavour breaking effects appearing in the Wilson twisted mass formulation of lattice QCD. In this quenched study, we focus on the mass splitting between the neutral and the charged pion, determining the neutral pion mass with a stochastic noise method to evaluate the disconnected contributions. We find that these disconnected contributions are significant. Using the Osterwaider-Seiler interpretation of the connected piece of the neutral pion correlator, we compute the corresponding neutral pion mass to study with more precision the scaling behaviour of the mass splitting. (c) 2005 Elsevier B.V. All rights reserved.
Flavour breaking effects of Wilson twisted mass fermions / K., Jansen; C., Mcneile; C., Michael; K., Nagai; Papinutto, MAURO LUCIO; J., Pickavance; A., Shindler; C., Urbach; I., Wetzorke. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 624:3-4(2005), pp. 334-341. [10.1016/j.physletb.2005.08.029]
Flavour breaking effects of Wilson twisted mass fermions
PAPINUTTO, MAURO LUCIO;
2005
Abstract
We study the flavour breaking effects appearing in the Wilson twisted mass formulation of lattice QCD. In this quenched study, we focus on the mass splitting between the neutral and the charged pion, determining the neutral pion mass with a stochastic noise method to evaluate the disconnected contributions. We find that these disconnected contributions are significant. Using the Osterwaider-Seiler interpretation of the connected piece of the neutral pion correlator, we compute the corresponding neutral pion mass to study with more precision the scaling behaviour of the mass splitting. (c) 2005 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
