Relativistic spin dynamics for vector mesons

被引：20

作者：

Sheng, Xin-Li ^{[1
,2
]}

Oliva, Lucia ^{[3
,4
]}

Liang, Zuo-Tang ^{[5
]}

Wang, Qun ^{[6
,7
]}

Wang, Xin-Nian ^{[8
]}

机构：

[1] INFN Firenze, Via Giovanni Sansone 1, I-50019 Sesto Fiorentino, FI, Italy

[2] Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Peoples R China

[3] Univ Catania, Dept Phys & Astron Ettore Majorana, Via S Sofia 64, I-95123 Catania, Italy

[4] INFN, Sez Catania, Via S Sofia 64, I-95123 Catania, Italy

[5] Shandong Univ, Inst Frontier & Interdisciplinary Sci, Key Lab Particle Phys & Particle Irradiat, MOE, Qingdao 266237, Shandong, Peoples R China

[6] Univ Sci & Technol China, Peng Huanwu Ctr Fundamental Theory, Hefei 230026, Anhui, Peoples R China

[7] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China

[8] Lawrence Berkeley Natl Lab, Nucl Sci Div, MS 70R0319, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW D | 2024年 / 109卷 / 03期

基金：

中国国家自然科学基金;

关键词：

QUANTUM CHROMODYNAMICS; QUARK; POLARIZATION; INSTANTONS; QCD;

D O I：

10.1103/PhysRevD.109.036004

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We propose a relativistic theory for spin density matrices of vector mesons based on Kadanoff-Baym equations in the closed-time-path formalism. The theory puts the calculation of spin observables such as the spin density matrix element rho 00 for vector mesons on a solid ground. Within the theory we formulate rho 00 for phi mesons into a factorization form in separation of momentum and spacetime variables. We argue that the main contribution to rho 00 at lower energies should be from the phi fields that can polarize the strange quark and antiquark in the same way as electromagnetic fields. The key observation is that there is correlation inside the phi meson wave function between the phi field that polarizes the strange quark and that polarizes the strange antiquark. This is reflected by the fact that the contributions to rho 00 are all in squares of fields that are nonvanishing even if the fields may strongly fluctuate in spacetime. The fluctuation of strong force fields can be extracted from rho 00 of unflavored vector mesons as links to fundamental properties of quantum chromodynamics.

引用

页数：20

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