Transverse momentum distributions of quarks in the nucleon from the chiral quark soliton model

Journal Article · Fri May 01 04:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.094028· OSTI ID:21308432

Wakamatsu, M ^[1]

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1. Department of Physics, Faculty of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan)

We report the first calculation of the simplest but most fundamental transverse-momentum-dependent distribution of quarks in the nucleon, i.e. the time-reversal-even unpolarized transverse-momentum-dependent quark and antiquark distribution with isoscalar combination, within the framework of the chiral quark soliton model. The nonperturbative account of the deformed Dirac-sea quarks within the theoretical scheme enables us to make reliable predictions not only for the quark distribution but also for the antiquark distribution. We found that the predicted average transverse momentum square <k{sub perpendicular}{sup 2}> of quarks and antiquarks depends strongly on their longitudinal momentum fraction x, which means that the frequently used assumption of factorization in x and k{sub perpendicular} is significantly violated. It is also found, somewhat unexpectedly, that the average transverse momentum square of antiquarks is considerably larger than that of quarks.

• OSTI ID: 21308432
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 79; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTIQUARKS
CHIRALITY
COMPUTERIZED SIMULATION
DISTRIBUTION
FACTORIZATION
FORECASTING
LONGITUDINAL MOMENTUM
NUCLEONS
QUARK MATTER
QUARKS
SOLITONS
TRANSVERSE MOMENTUM