Dynamical spin effects in the holographic light-front wavefunctions of light pseudoscalar mesons

被引：27

作者：

Ahmady, Mohammad ^{[1
]}

Mondal, Chandan ^{[2
]}

Sandapen, Ruben ^{[1
,3
]}

机构：

[1] Mt Allison Univ, Dept Phys, Brunswick, NB E4L 1E6, Canada

[2] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China

[3] Acadia Univ, Dept Phys, Wolfville, NS B4P 2R6, Canada

来源：

PHYSICAL REVIEW D | 2018年 / 98卷 / 03期

基金：

中国博士后科学基金; 加拿大自然科学与工程研究理事会;

关键词：

PION FORM-FACTOR; PARTON RECOMBINATION; ASYMPTOTIC-BEHAVIOR; EXCLUSIVE PROCESSES; MOMENTUM; ETA'; NUCLEON; QCD; Q2; ELECTROPRODUCTION;

D O I：

10.1103/PhysRevD.98.034010

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We quantify the importance of dynamical spin effects in the holographic light-front wavefunctions of the pion, kaon, eta and eta'. Using a universal AdS/QCD scale and constituent quark masses, we find that such effects are maximal in the pion where they lead to an excellent simultaneous description of a wide range of data: the decay constant, charge radius, spacelike EM and transition form factors, as well as, after QCD evolution, both the parton distribution function and the parton distribution amplitude data from Fermilab. These dynamical spin effects lead up to a 30% chance of finding the valence quark and antiquark with aligned spins in the pion. The situation is very different for the kaon, where a simultaneous description of the available data (decay constant, radius and spacelike EM form factor) prefer no dynamical spin effects at all. The situation is less clear for the eta and eta': while their radiative decay widths data are consistent with dynamical spin effects only in eta', the data on their spacelike transition form factors clearly favor maximal dynamical spin effects in both mesons.

引用

页数：14

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