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Seminars And Colloquia This Week
Joint Nuclear/HEP seminar
Wednesday, July 24, 2019
3:30 PM
Physics Building, Room 204

Yuri Kovchegov
[Host: Peter Arnold]
Ohio State
"Proton Spin at Small x"

ABSTRACT:
An integral part of the proton spin puzzle are the contributions to the proton spin coming from quarks and gluons having very small values of the Bjorken x variable. These contributions are mostly beyond the reach of current experiments and are very hard to calculate numerically on the lattice. It appears that better theoretical understanding of quark and gluon helicity distributions at small x is needed to assess the amount of proton spin coming from this region. In my talk I will describe the recent theoretical work aimed at finding the smallx asymptotics of the quark and gluon helicity distributions, along with their orbital angular momenta (OAM). I will derive smallx evolution equation for helicity and solve them to find the smallx asymptotics of the parton helicity distributions and OAM. The results of this work can be compared to the data to be collected at the upcoming ElectronIon Collider (EIC) and can also be used to extrapolate the smallx helicity distributions to be measured at EIC to even smaller values of x, thus constraining the proton spin coming from small x.




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