Δ-baryon electromagnetic form factors in lattice QCD

被引：65

作者：

Alexandrou, C. ^{[1
]}

Korzec, T. ^{[1
]}

Koutsou, G. ^{[1
]}

Leontiou, Th. ^{[1
]}

Lorce, C. ^{[2
]}

Negele, J. W. ^{[3
,4
]}

Pascalutsa, V. ^{[2
]}

Tsapalis, A. ^{[5
]}

Vanderhaeghen, M. ^{[2
]}

机构：

[1] Univ Cyprus, Dept Phys, CY-1678 Nicosia, Cyprus

[2] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany

[3] MIT, Ctr Theoret Phys, Nucl Sci Lab, Cambridge, MA 02139 USA

[4] MIT, Dept Phys, Cambridge, MA 02139 USA

[5] Univ Athens, Inst Accelerating Syst & Applicat, GR-10024 Athens, Greece

来源：

PHYSICAL REVIEW D | 2009年 / 79卷 / 01期

关键词：

D O I：

10.1103/PhysRevD.79.014507

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We develop techniques to calculate the four Delta electromagnetic form factors using lattice QCD, with particular emphasis on the subdominant electric quadrupole form factor that probes deformation of the Delta. Results are presented for pion masses down to approximately 350 MeV for three cases: quenched QCD, two flavors of dynamical Wilson quarks, and three flavors of quarks described by a mixed action combining domain-wall valence quarks and dynamical staggered sea quarks. The magnetic moment of the Delta is compared with chiral effective field theory calculations and the Delta charge density distributions are discussed.

引用

页数：5