Physics Seminars at Baruch
Address: 17 Lexington Avenue, New York, NY 10010 (how to find us)
Nov. 17th, 2015, 12:00 pm, Room 946
Abstract: During the last three decades, relativistic heavy ion collisions have been studied to map out the phase diagram of quantum chromodynamics (QCD) matter at increasing center-of-mass energies of <5 GeV at the Alternating Gradient Synchrotron in Brookhaven, <20 GeV at the the Super Proton Synchrotron at CERN and 200 GeV at the Relativistic Heavy Ion Collider in Brookhaven. More recently, the Large Hadron Collider (LHC) at CERN started delivering heavy ion collisions (Pb+Pb) at a center-of-mass energy of 2.76 TeV per nucleon pair along with reference data of pp and p+Pb collisions. With its unprecedented reach in energy, LHC explores new regions of the phase diagram that can resolve fundamental questions regarding confinement, such as ``What determines the key features of QCD?" and "How does the hot QCD respond to jet energy loss?”. In this talk, an overview of the recent experimental results on jet production in heavy-ion collisions is presented to study the detailed properties of the hot QCD matter.
Nov. 3rd, 2015, 12:30pm, Room 946
Abstract: The Cronin effect, which is nuclear enhancement of high-pT hadron production in pA collisions was successfully predicted prior the measurements both at RHIC and LHC. The restrictions imposed by energy conservation lead to spectacular effects. Energy deficit becomes an issue for hadron production in pA collisions at large xL and/or large xT, toward the kinematic bounds xL,T = 1. It leads to a suppression, which has been indeed observed for hadrons produced at forward rapidities and large pT. Intensive energy dissipation via gluon radiation by a highly virtual parton produced with large pT, makes this process impossible to last long. Color neutralization and creation of a colorless dipole must occur promptly. When this happens inside a hot medium created in AA collisions, attenuation of colorless dipoles, rather than induced energy loss, becomes a dominant mechanism for suppression of high-pT hadrons, in a good accord with data.
Highlights from the Quark Matter 2015 Conference
Oct. 22nd, 2015, 12:00 pm, Room 946
Abstract: We will present highlights from the recent international Quark Matter 2017 conference in Kobe, Japan. The focus will be on results on the possibility of creating a Quark-Gluon Plasma in small systems (p(d)+A, p+p) and on measurements of energy loss of hard scattered partons.