AUG
25
Friday
Nuclear Theory/RIKEN Seminar
"QCD corrections to high-pT hadron production in ep scattering"
Presented by Werner Vogelsang, Tuebingen University
2 pm, Small Seminar Room, Bldg. 510
Friday, August 25, 2017, 2:00 pm
Hosted by: 'Heikki Mantysaari'
We discuss various cross sections and spin observables in high-pT hadron production in lepton proton collisions, with special focus on the role of perturbative QCD corrections. We present phenomenological studies relevant for present fixed-target experiments and for a future EIC.
SEP
12
Tuesday
Physics Colloquium
"Momentum-space structure of hadrons and nuclei at high energy"
Presented by Elena Petreska, NIKHEF
3:30 pm, Large Seminar Room, Bldg. 510
Tuesday, September 12, 2017, 3:30 pm
Transverse-momentum-dependent (TMD) distributions describe the configuration of quarks and gluons inside protons and nuclei in three-dimensional momentum space. Observables in scattering experiments can be calculated with the help of TMD factorization formulas, where the target and projectile are represented with non-perturbative TMD distributions, which are separated from the short-distance perturbative part of the collision. A complementary approach to study the momentum structure of protons and nuclei at high energy is the Color Glass Condensate which is an effective theory for the high-gluon-density region of ultra-relativistic particles. We introduce both theories and we discuss connections between them. We present phenomenological results derived from these connections.
SEP
15
Friday
Nuclear Theory/RIKEN Seminar
"TMD gluon distributions for dijet production and their behavior at small x"
Presented by Elena Petreska, NIKHEF
2 pm, Small Seminar Room, Bldg. 510
Friday, September 15, 2017, 2:00 pm
Hosted by: ''Heikki Mantysaari''
Starting from the Color Glass Condensate (CGC) cross section for dijet production in proton-nucleus collisions we derive a transverse-momentum-dependent (TMD) factorization formula for small transverse-momentum imbalance of the jets and for finite number of colors. For the eight TMD distributions appearing in the cross section we determine their operator definitions at small-x as CGC correlators of Wilson lines and we study their JIMWLK evolution. We find that at large transverse momentum the universality of TMDs gets restored. We also discuss an extension of the approach to generalized TMDs (GTMDs) that can give an insight into the angular correlations between impact parameter and dipole size in the CGC framework.