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Phys. Rev. D 60, 034507 (1999) [15 pages]

Light hadron spectroscopy with O(a) improved dynamical fermions

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C. R. Allton1, S. P. Booth2, K. C. Bowler3, M. Foster4, J. Garden3, A. C. Irving4, R. D. Kenway3, C. Michael4, J. Peisa4, S. M. Pickles3, J. C. Sexton5, Z. Sroczynski3, M. Talevi3, and H. Wittig6 (UKQCD Collaboration)
1Department of Physics, University of Wales, Singleton Park, Swansea SA2 SPP, United Kingdom
2Edinburgh Parallel Computing Centre, University of Edinburgh, Edinburgh EH9 3JZ, Scotland
3Department of Physics & Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, Scotland
4Division of Theoretical Physics, Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX, United Kingdom
5School of Mathematics, Trinity College, Dublin 2, IrelandHitachi Dublin Laboratory, Dublin 2, Ireland
6Theoretical Physics, University of Oxford, Oxford OX1 3NP, United Kingdom

Received 17 August 1998; published 7 July 1999

We present the first results for the static quark potential and the light hadron spectrum using dynamical fermions at β=5.2 using an O(a) improved Wilson fermion action together with the standard Wilson plaquette action for the gauge part. Sea quark masses were chosen such that the pseudoscalar-vector mass ratio, mPS/mV, varies from 0.86 to 0.67. Finite-size effects are studied by using three different volumes 83×24, 123×24, and 163×24. Comparing our results to previous ones obtained using the quenched approximation, we find evidence for sea quark effects in quantities such as the static quark potential and vector-pseudoscalar hyperfine splitting.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.60.034507
DOI:
10.1103/PhysRevD.60.034507
PACS:
12.38.Gc, 12.40.Yx
 
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