Diquark properties from full QCD lattice simulations

被引：11

作者：

Francis, Anthony ^{[1
,2
,3
]}

de Forcrand, Philippe ^{[2
]}

Lewis, Randy ^{[4
]}

Maltman, Kim ^{[5
,6
]}

机构：

[1] Univ Bern, Albert Einstein Ctr, CH-3012 Bern, Switzerland

[2] CERN, Theory Dept, CH-3012 Geneva, Switzerland

[3] Natl Yang Ming Chiao Tung Univ, Inst Phys, Hsinchu 30010, Taiwan

[4] York Univ, Dept Phys & Astronomy, Toronto, ON M3J 1P3, Canada

[5] York Univ, Dept Math & Stat, Toronto, ON M3J 1P3, Canada

[6] Univ Adelaide, CSSM, Adelaide, SA 5005, Australia

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2022年 / 2022卷 / 05期

关键词：

Hadronic Spectroscopy; Structure and Interactions; Lattice QCD; Properties of Hadrons; Specific QCD Phenomenology; MASSES; BARYON; INSTANTONS; HADRON; MODEL;

D O I：

10.1007/JHEP05(2022)062

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We study diquarks on the lattice in the background of a static quark, in a gauge-invariant formalism with quark masses down to almost physical m(pi). We determine mass differences between diquark channels as well as diquark-quark mass differences. The lightest and next-to-lightest diquarks have "good" scalar, (3) over bar (F), (3) over bar (c), J(P) = 0(+), and "bad" axial vector, 6(F), (3) over bar (c), J(P) = 1(+), quantum numbers, and a bad-good mass difference for ud flavors, 198(4) MeV, in excellent agreement with phenomenological determinations. Quark-quark attraction is found only in the "good" diquark channel. We extract a corresponding diquark size of similar to 0.6 fm and perform a first exploration of the "good" diquark shape, which is shown to be spherical. Our results provide quantitative support for modeling the low-lying baryon spectrum using good light diquark effective degrees of freedom.

引用

页数：21