Calendar

Add to Calendar 1/19/2018 12:00 pm 1/19/2018 America/Chicago High Energy/Medium Energy Physics Seminar:"Revealing short-distance structure of the nucleon in lattice QCD." DESCRIPTION:

With the recent completion of the 12 GeV upgrade at Jefferson Lab, the next decade is anticipated to see tremendous advances in the understanding of nucleon and nuclear structure, with a strong emphasis on 3-dimensional imaging of quark distributions. Further beyond, the planned Electron–Ion Collider will produce detailed images of the corresponding gluon distributions. These experiments will be both complimented and enhanced by continuing theoretical advances in lattice QCD. In this talk I highlight some recent advances in lattice QCD calculations of nucleon structure that form the foundation of these efforts. In particular, I will focus on computing elastic form factors and deep inelastic structure functions. Through an adaptation of the Feynman–Hellmann theorem, the elastic form factors can be probed at much larger momenta than has been typically accessible in the past. Importantly, the fall in the ratio of electric-to-magnetic form factors has been revealed for the first time in lattice QCD — in agreement with the trend discovered at Jefferson Lab 6 GeV. Further extension of Feynman–Hellmann, combined with a dispersive representation for the Compton amplitude, provides a new method to study structure functions on the lattice. This method allows one to go beyond the lowest Bjorken-x moments and even beyond leading twist, overcoming longstanding problems associated with power-divergent mixing on the lattice.

\n\nSPEAKER:

Professor Ross Young, University of Adelaide, Australia

464 Loomis

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High Energy/Medium Energy Physics Seminar:"Revealing short-distance structure of the nucleon in lattice QCD."

Speaker Professor Ross Young, University of Adelaide, Australia
Date: 1/19/2018
Time: 12 p.m.
Location:

464 Loomis

Event Contact: Marjorie Gamel
217-333-3762
mgamel@illinois.edu
Sponsor:

Department of Physics

Event Type: Seminar/Symposium
 

With the recent completion of the 12 GeV upgrade at Jefferson Lab, the next decade is anticipated to see tremendous advances in the understanding of nucleon and nuclear structure, with a strong emphasis on 3-dimensional imaging of quark distributions. Further beyond, the planned Electron–Ion Collider will produce detailed images of the corresponding gluon distributions. These experiments will be both complimented and enhanced by continuing theoretical advances in lattice QCD. In this talk I highlight some recent advances in lattice QCD calculations of nucleon structure that form the foundation of these efforts. In particular, I will focus on computing elastic form factors and deep inelastic structure functions. Through an adaptation of the Feynman–Hellmann theorem, the elastic form factors can be probed at much larger momenta than has been typically accessible in the past. Importantly, the fall in the ratio of electric-to-magnetic form factors has been revealed for the first time in lattice QCD — in agreement with the trend discovered at Jefferson Lab 6 GeV. Further extension of Feynman–Hellmann, combined with a dispersive representation for the Compton amplitude, provides a new method to study structure functions on the lattice. This method allows one to go beyond the lowest Bjorken-x moments and even beyond leading twist, overcoming longstanding problems associated with power-divergent mixing on the lattice.

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