On the hadron mass decomposition

被引:92
作者
Lorce, Cedric [1 ]
机构
[1] Univ Paris Saclay, CNRS, Ecole Polytech, Ctr Phys Theor, F-91128 Palaiseau, France
来源
EUROPEAN PHYSICAL JOURNAL C | 2018年 / 78卷 / 02期
关键词
ENERGY-MOMENTUM-TENSOR; ANGULAR-MOMENTUM; ANOMALIES; SPIN; QCD; QUARKONIUM; TRACE;
D O I
10.1140/epjc/s10052-018-5561-2
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 argue that the standard decompositions of the hadron mass overlook pressure effects, and hence should be interpreted with great care. Based on the semiclassical picture, we propose a new decomposition that properly accounts for these pressure effects. Because of Lorentz covariance, we stress that the hadron mass decomposition automatically comes along with a stability constraint, which we discuss for the first time. We show also that if a hadron is seen as made of quarks and gluons, one cannot decompose its mass into more than two contributions without running into trouble with the consistency of the physical interpretation. In particular, the so-called quark mass and trace anomaly contributions appear to be purely conventional. Based on the current phenomeno-logical values, we find that in average quarks exert a repulsive force inside nucleons, balanced exactly by the gluon attractive force.
引用
收藏
页数:11
相关论文
共 60 条
[1]   ENERGY-MOMENTUM-TENSOR TRACE ANOMALY IN SPIN-1/2 QUANTUM ELECTRODYNAMICS [J].
ADLER, SL ;
COLLINS, JC ;
DUNCAN, A .
PHYSICAL REVIEW D, 1977, 15 (06) :1712-1721
[2]  
[Anonymous], ARXIVHEPPH0207153
[3]  
[Anonymous], 2014, CAMB MONOGR PART PHY
[4]  
[Anonymous], 2013, Relativistic Hydrodynamics
[5]  
Baikov P., 2014, JHEP, V1410, P76, DOI [10.1007/JHEP10(2014)076, DOI 10.1007/JHEP10(2014)076]
[6]   Critique of the angular momentum sum rules and a new angular momentum sum rule [J].
Bakker, BLG ;
Leader, E ;
Trueman, TL .
PHYSICAL REVIEW D, 2004, 70 (11) :114001-1
[7]   Direct determinations of the nucleon and pion σ terms at nearly physical quark masses [J].
Bali, Gunnar S. ;
Collins, Sara ;
Richtmann, Daniel ;
Schaefer, Andreas ;
Soeldner, Wolfgang ;
Sternbeck, Andre .
PHYSICAL REVIEW D, 2016, 93 (09)
[8]   Quark transverse spin-orbit correlations [J].
Bhoonah, Amit ;
Lorce, Cedric .
PHYSICS LETTERS B, 2017, 774 :435-440
[9]  
Bressani T., 2005, P INT SCH PHYS PERM, V158
[10]  
Brodsky SJ, 1998, PHYS REP, V301, P300