Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session G05: Early Science Results from Jefferson Lab 12 GeV ProgramInvited Live
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Sponsoring Units: GHP Chair: Lamiaa El Fassi, Mississippi State University |
Sunday, April 18, 2021 8:30AM - 9:06AM Live |
G05.00001: Overview of Jefferson Lab Theory Invited Speaker: Wally Melnitchouk The 12 GeV era of nuclear physics at Jefferson Lab is well underway. With the prospect of new high-precision data appearing soon, we present an overview of the theoretical tools currently being developed to interpret the data and extract from it longitudinal and transverse parton correlation functions of hadrons. This talk will focus on progress being made in applying modern data analysis methods, as well as lattice QCD simulations, to infer various momentum and spin correlation functions and reveal the landscape of the 3-dimensional quark and gluon structure of hadrons. [Preview Abstract] |
Sunday, April 18, 2021 9:06AM - 9:42AM Live |
G05.00002: Ruling out Color Transparency in quasi-elastic $^{12}$C$(e,e’p)$ up to $Q^2 = 14$ (GeV/c)$^2$ Invited Speaker: Holly Szumila-Vance Color transparency (CT) is a fundamental phenomenon of QCD postulating that at high momentum transfer, one can preferentially measure hadrons that fluctuate to a small color neutral transverse size in the nucleus, and final state interactions within the nuclear medium are suppressed. This talk will discuss the recent quasi-elastic $^{12}$C$(e, e’p)$ scattering measurement in Hall C at momentum transfer squared $Q^2 = 8, 9.4,11.4,$ and 14.2 (GeV/c)$^2$, the highest ever achieved to date. Nuclear transparency for this reaction was extracted by comparing the measured yield to that expected from a plane-wave impulse approximation calculation without any final state interactions. The measured transparency was observed to be independent of $Q^2$, ruling out the quantum chromodynamics effect of color transparency at such momentum scales. These new results impose strict constraints on models of color transparency for protons. [Preview Abstract] |
Sunday, April 18, 2021 9:42AM - 10:18AM Live |
G05.00003: Early Results from GlueX Invited Speaker: Justin Stevens The GlueX experiment, located in Jefferson Lab's Hall D, provides a unique capability to search for hybrid mesons in photoproduction, utilizing a high-energy, linearly polarized photon beam. The initial phase of data taking, completed in 2018, provides unprecedented statistics to study the production mechanisms of known hadrons as well as search for new states in the hadron spectrum, including those with gluonic degrees of freedom. Early results from this dataset will be presented, along with progress towards higher statistics datasets with enhanced particle identification to study mesons containing strange quarks. [Preview Abstract] |
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