Bulletin of the American Physical Society
86th Annual Meeting of the APS Southeastern Section
Volume 64, Number 19
Thursday–Saturday, November 7–9, 2019; Wrightsville Beach, North Carolina
Session G02: Precision QCD Experiments |
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Chair: Timothy Daniels, University of North Carolina Wilmington Room: Holiday Inn Resort Airlie/Tidewater |
Friday, November 8, 2019 2:00PM - 2:30PM |
G02.00001: Chiral anomalies of the Standard Model and their tests Invited Speaker: Jose Goity Chiral anomalies are fundamental aspects of relativistic quantum field theory. Their origin is quantum mechanical and are the result of the quantum vacuum fluctuations of Fermion fields (leptons and quarks). Their test is therefore of fundamental importance as it serves to confirm the paradigm of the Standard Model as a quantum field theory. This talk will present the fundamentals of anomalies and will discuss the relevant tests, in particular tests that involve the pseudo scalar mesons $\pi^0$ and $\eta$ which have been investigated in experiments at Jefferson Lab. A discussion of possible future tests will also be presented. [Preview Abstract] |
Friday, November 8, 2019 2:30PM - 3:00PM |
G02.00002: Overview of JLab Primakoff Program Invited Speaker: Liping Gan The light pseudoscalar meson decays provide a unique laboratory to test fundamental QCD symmetries at low energy. A comprehensive Primakoff experimental program at Jefferson Laboratory (JLab) is aimed at gathering high precision measurements of the two-photon decay widths and the transition form factors at low four-momentum transfer squares for $\pi ^{\mathrm{0}}$, $\eta $ and $\eta \prime $ via the Primakoff effect. The results of these measurements will offer stringent tests of the chiral anomaly and provide sensitive probes for the origin and dynamics of chiral symmetry breaking. The status of these experimental activities and their physics impacts will be discussed. [Preview Abstract] |
Friday, November 8, 2019 3:00PM - 3:30PM |
G02.00003: PrimEx results for the Neutral Pion Radiative Width. Invited Speaker: Ilya Larin The $\pi^{\mathrm{0}}\to \gamma \gamma $ decay amplitude is one of the most precisely calculable values in the low energy QCD. The PrimEx-I and PrimEx-II experiments used Primakoff effect to measure $\pi^{\mathrm{0}}$ radiative decay width. I will present the combined result of both PrimEx experiments performed in Hall-B at Jefferson Lab. The PrimEx-I experiment performed in 2004 achieved a precision of 2.8{\%}. PrimEx-II has been conducted in 2010 with a collection of five times more statistics and achieved 1.6{\%} precision. This measurement gives a possibility to check QCD predictions at 1.5{\%} level. [Preview Abstract] |
Friday, November 8, 2019 3:30PM - 4:00PM |
G02.00004: Plans for a Measurement of Charged and Neutral Pion Polarizabilities with GlueX Invited Speaker: Mark Ito We report on the status of preparations for a measurement of the charged pion polarizability. The experiment is approved to run in Hall D at Jefferson using the GlueX detector. In addition we report on plans for a proposal to measure the neutral pion polarizability, also with GlueX, to run simultaneously with the charged pion experiment. For both charged and neutral pions the polarizabilities are fully predicted at leading order in quark masses, and thus represent a sensitive test of chiral dynamics. Polarizabilities are accessed through a measurement of the absolute cross section of $\pi^+\pi^-$ and $\pi^0\pi^0$ production near threshold via the Primakoff effect, $\gamma \gamma^*\rightarrow \pi\pi$ where the virtual photon is provided by the Coulomb field of the target nucleus. Construction of a new detector system for identification of muon pair production, which present a background for the charged mode, are underway and will be described. [Preview Abstract] |
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