Light hadron spectroscopy using domain wall valence quarks on an asqtad sea

被引：147

作者：

Walker-Loud, A. ^{[1
]}

Lin, H. -W. ^{[2
]}

Richards, D. G. ^{[2
]}

Edwards, R. G. ^{[2
]}

Engelhardt, M. ^{[3
]}

Fleming, G. T. ^{[4
]}

Haegler, Ph. ^{[5
]}

Musch, B. ^{[5
]}

Lin, M. F. ^{[6
]}

Meyer, H. ^{[6
]}

Negele, J. W. ^{[6
]}

Pochinsky, A. V. ^{[6
]}

Procura, M. ^{[6
]}

Syritsyn, S. ^{[6
]}

Morningstar, C. J. ^{[7
]}

Orginos, K. ^{[2
,8
]}

Renner, D. B. ^{[9
]}

Schroers, W. ^{[10
]}

机构：

[1] Univ Maryland, Dept Phys, Maryland Ctr Fundamental Phys, College Pk, MD 20742 USA

[2] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA

[3] New Mexico State Univ, Dept Phys, Las Cruces, NM 88003 USA

[4] Yale Univ, Sloane Phys Lab, New Haven, CT 06520 USA

[5] Tech Univ Munich, Dept Phys, Inst Theoret Phys T39, D-85747 Garching, Germany

[6] MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA

[7] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA

[8] Coll William & Mary, Dept Phys, Williamsburg, VA 23187 USA

[9] DESY, Theory Grp, D-15738 Zeuthen, Germany

[10] Natl Taiwan Univ, Dept Phys, Ctr Theoret Sci, Taipei 10617, Taiwan

来源：

PHYSICAL REVIEW D | 2009年 / 79卷 / 05期

关键词：

CHIRAL PERTURBATION-THEORY; BARYON MASSES; LATTICE QCD; BREAKING; NUCLEON;

D O I：

10.1103/PhysRevD.79.054502

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We calculate the light hadron spectrum in full QCD using two plus one flavor asqtad sea quarks and domain wall valence quarks. Meson and baryon masses are calculated on a lattice of spatial size L approximate to 2.5 fm, and a lattice spacing of a approximate to 0.124 fm, for pion masses as light as m(pi)approximate to 300 MeV, and compared with the results by the MILC Collaboration with asqtad valence quarks at the same lattice spacing. Two- and three-flavor chiral extrapolations of the baryon masses are performed using both continuum and mixed action heavy baryon chiral perturbation theory. Both the three-flavor and two-flavor functional forms describe our lattice results, although the low-energy constants from the next-to-leading order SU(3) fits are inconsistent with their phenomenological values. Next-to-next-to-leading order SU(2) continuum formulae provide a good fit to the data and yield an extrapolated nucleon mass consistent with experiment, but the convergence pattern indicates that even our lightest pion mass may be at the upper end of the chiral regime. Surprisingly, our nucleon masses are essentially linear in m(pi) over our full range of pion masses, and we show this feature is common to all recent dynamical calculations of the nucleon mass. The origin of this linearity is not presently understood, and lighter pion masses and increased control of systematic errors will be needed to resolve this puzzling behavior.

引用

页数：37

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