DATE: |
2013-11-12 13:30 - 14:30 |
PLACE: |
Kenkyu Honkan 3F seminar roomĦĦ322 |
TITLE: |
Sea quark transverse momentum and parton short-range correlations in QCD |
CONTACT: |
Takayasu Sekihara, sekihara-AT-post.kek.jp |
SPEAKER: |
Dr. Christian Weiss (Jefferson Lab) |
LANGUAGE: |
English |
ABSTRACT: |
The dynamical breaking of chiral symmetry in QCD is caused by nonperturbative interactions with a range rho ~ 0.3 fm, much smaller than the typical hadronic size. Recent theoretical work has studied the effects of these interactions on the nucleon's partonic structure at a low scale: (a) Sea quarks have intrinsic transverse momenta up to the scale 1/rho, much larger than those of valence quarks. (b) Sea quarks exhibit short-range correlations of size rho with characteristic quantum numbers (sigma, pi), analogous to NN correlations in nuclei. The effects are demonstrated in a model of low-energy dynamics based on the large-N_c limit of QCD. They can be tested experimentally and have numerous implications for hadron production in semi-inclusive deep-inelastic scattering (HERMES, COMPASS, JLab 12 GeV), dilepton production in hadron-hadron scattering (FNAL, COMPASS, RHIC W, J-PARC), and multiparton processes in high-energy pp collisions (LHC). |
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