2018 Spring Graduate Colloquium Series: Ryan Pittman/Sina Rostami

DateApril 13, 2018Time3:35 - 5:00 pm
LocationBaylor Sciences Building, Room E.125
Description
2018 Spring Graduate Colloquium Series

Ryan Pittman

Jet properties in PbPb and pp collisions at = 5.02 TeV

The modifications of jet properties in PbPb collisions are compared to those that occur in pp collisions, with a nucleon-nucleon center-of-mass energy at = 5.02 TeV. These are studied through correlations of charged particles with the jet axis in relative pseudorapidity, relative azimuth, and relative angular distance from the jet axis. The analysis is presented with data collected at the CMS detector at the LHC, corresponding to integrated luminosities of 404 µb−1 and 27.4 pb−1 for PbPb and pp collisions, respectively. The properties discussed are charged particle number densities, jet fragmentation functions, and jet shapes as a function of the PbPb collision centrality, as well as the charged-particle track transverse momentum, which provides a differential description those modifications of jet properties due to the production of quark-gluon plasma produced in the PbPb collisions.

Sina Rostami

Molecular Dynamics Simulation of Ion Flows around Microparticles

Complex plasma plays an important role in physical processes in planetary science, the computer industry, and several other fields. Better understanding on the microparticles and streaming ions dynamics in dusty plasma through quality numerical modeling of its characteristics could be important for the applications on complex plasma. Molecular dynamics simulations are one of the computational tools to investigate complex plasma. This talk will describe the Molecular Asymmetric Dynamics (MAD) codes simulation of flowing ions interacting with charged microparticles. The critical physical principles embedded in the MAD code will be described, and it will be shown that its applications can be used for the systematic study of ion wake induced attractive forces in particle pairs. The comparison of the MAD code with other numerical simulations yields reliable results and shows that the combined wake charges of a vertically flow-aligned particle pair do not result in a net attractive force as previously postulated.

For more information contact: Dr. Howard Lee 254-710-2277
PublisherDepartment of Physics
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