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Twisted mass fermions: neutral pion masses from disconnected contributions

Farchioni, F.; Jansen, K.; McNeile, C.; Michael, C.; Montvay, I.; Nagai, K.; Papinutto, M.; Pickavance, J.; Scholz, E.; Scorzato, L.; Shindler, A.; Ukita, N.; Urbach, C.; Wenger, U. and Wetzorke, I. (2005) Twisted mass fermions: neutral pion masses from disconnected contributions. In: XXIII International Symposium on Lattice Field Theory, 25th-30th July 2005, School of Mathematics, Trinity College, Dublin.

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Abstract

Twisted mass fermions allow light quarks to be explored but with the consequence that there are mass splittings, such as between the neutral and charged pion. Using a direct calculation of the connected neutral pion correlator and stochastic methods to evaluate the disconnected correlations, we determine the neutral pion mass. We explore the dependence on lattice spacing and quark mass in quenched QCD. For dynamical QCD, we determine the sign of the splitting which is linked, via chiral PT, to the nature of the phase transition at small quark mass.

Item Type:Conference or Workshop Item (Poster)
Additional Information:LTH 665; arXiv Number: arXiv:hep-lat/0509036v1. Additional citation information: PoS LAT2005 (2005) 033; Article ID: 033. 6 pages.
Uncontrolled Keywords:light quarks; neutral pion; charged pion; mass splittings; stochastic methods; neutral pion mass; lattice spacing; quark mass; quenched QCD; dynamical QCD; chiral PT
Subjects:Q Science > QC Physics
Departments, Research Centres and Related Units:Academic Faculties, Institutes and Research Centres > Faculty of Science > Department of Mathematical Sciences
Publisher's Statement:Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. The author(s) and right holder(s) of such contributions grant(s) to all users a free, irrevocable, worldwide, right of access to, and a license to copy, use, distribute, transmit and display the work publicly and to make and distribute derivative works, in any digital medium for any responsible purpose, subject to proper attribution of authorship (community standards, will continue to provide the mechanism for enforcement of proper attribution and responsible use of the published work, as they do now), as well as the right to make small numbers of printed copies for their personal use.
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Refereed:Yes
Status:Published
ID Code:407
Deposited On:18 Aug 2008 12:07
Last Modified:10 May 2012 13:59

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