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HEP Seminar: Gluon saturation effects in forward dijet production at LHC

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Piotr Kotko, The Pennsylvania State University
26 October 2016 from 1:30 PM to 2:30 PM
339 Davey Laboratory
Contact Name
Kohta Murase
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In high energy processes the colliding hadrons can be probed in a state which is dense, especially when the collision involves nuclei and the observed final states are forward jets. The dominant QCD degrees of freedom in dense targets are gluons and it is believed that the density of gluons saturates, that is its growth with the energy is tamed by gluon recombination. Search of experimental confirmation of the saturation effects is still ongoing and requires reliable predictions on the theory side. The latter is rather difficult and at some point always based on some modeling. In this talk, after an introduction to the saturation physics, I shall describe a theory approach which is suitable for production of dijet system with rather large transverse momenta and show some numerical prediction for the LHC. The formulation is a factorization-like formalism which involves several so-called unintegrated gluon distributions which in certain approximation can be determined from data. In the limit of small transverse momentum imbalance of the dijet system it reduces to the leading power limit of the Color Glass Condensate effective theory, while for large imbalance it reduces to the kT-factorization, which, although not a QCD theorem, has some success in phenomenology outside the saturation regime.