Improved Lattice Spectroscopy of Minimal Walking Technicolor

Preprint number: CP3-Origins-2011-11
Authors: Francis Bursa (Jesus College, Cambridge), Luigi Del Debbio (University of Edinburgh), David Henty (University of Edinburgh), Eoin Kerrane (University of Edinburgh), Biagio Lucini (Swansea University), Agostino Patella (CERN), Claudio Pica (CP3-Origins), Thomas Pickup (University of Oxford), and Antonio Rago (Bergische Universität Wuppertal)
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We present a numerical study of spectroscopic observables in the SU(2) gauge theory with two adjoint fermions using improved source and sink operators. We compare in detail our improved results with previous determinations of masses that used point sources and sinks and we investigate possible systematic effects in both cases. Such comparison enables us to clearly assess the impact of a short temporal extent on the physical picture, and to investigate some effects due to the finite spatial box. While confirming the IR-conformal behaviour of the theory, our investigation shows that in order to make firm quantitative predictions, a better handle on finite size effects is needed.