Article (Scientific journals)
The quark orbital angular momentum from Wigner distributions and light-cone wave functions
Lorce, Cédric; Pasquini, Barbara; Xiong, Xiaonu et al.
2012In Physical Review. D, Particles, Fields, Gravitation, and Cosmology, D85, p. 114006
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Abstract :
[en] We investigate the quark orbital angular momentum of the nucleon in the absence of gauge-field degrees of freedom, by using the concept of the Wigner distribution and the light-cone wave functions of the Fock-state expansion of the nucleon. The quark orbital angular momentum is obtained from the phase-space average of the orbital angular momentum operator weighted with the Wigner distribution of unpolarized quarks in a longitudinally polarized nucleon. We also derive the light-cone wave-function representation of the orbital angular momentum. In particular, we perform an expansion in the nucleon Fock-state space and decompose the orbital angular momentum into the N-parton state contributions. Explicit expressions are presented in terms of the light-cone wave functions of the three-quark Fock state. Numerical results for the up and down quark orbital angular momenta of the proton are shown in the lightcone constituent quark model and the light-cone chiral quark-soliton model.
Disciplines :
Physics
Author, co-author :
Lorce, Cédric ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Physique des astroparticules
Pasquini, Barbara
Xiong, Xiaonu
Yuan, Feng
Language :
English
Title :
The quark orbital angular momentum from Wigner distributions and light-cone wave functions
Publication date :
2012
Journal title :
Physical Review. D, Particles, Fields, Gravitation, and Cosmology
ISSN :
1550-7998
eISSN :
1550-2368
Publisher :
American Physical Society, College Park, United States - Maryland
Volume :
D85
Pages :
114006
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 30 November 2013

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