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Colloquium: Exploring the Nucleon Structure at High Energy Colliders

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Colloquium by Anna Stasto (Penn State University)
31 October 2013 from 4:00 PM to 5:00 PM
117 Osmond Laboratory
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(814) 863-9595
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Deep inelastic scattering experiments of electrons on protons provided very precise  measurements of the proton structure.  One of the striking findings at HERA electron - proton collider was a discovery of large value of the gluon density, which grows rapidly with the increasing center of mass energy. This suggests that at high energies partonic systems  are created in elementary collisions and that nonlinear phenomena and multiple rescattering effects can occur.

Recent LHC measurements indeed indicate a presence of multiparton interactions. In this talk I will discuss the experimental and theoretical evidence for the presence of the large gluon component at high energies, theoretical expectation of subsequent nonlinear effects, and how to characterize the spatial extent of such system using the diffractive events with production of vector mesons. I will also discuss the prospects of future deep inelastic scattering experiments by utilizing the proton beam from the LHC.