Murray Moinester's 80th Birthday Lecture

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From: Michael Cordonsky <mcordi@tauex.tau.ac.il>
Date: Tue, Feb 11, 2020 at 5:02 PM
Subject: [NHPI] Prof. Murray Moinester 80th Birthday, 
next Joint seminar, TUESDAY, 3 March, 2020
To: <NUCLEAR-HADRON-PHYSICS-IL@listserv.tau.ac.il>

Dear Dear Nuclear/Hadron colleagues,

We inform you that the next Nuclear Physics Joint Seminar is dedicated to the 80th birthday 
of Professor Murray Moinester, and will take place on Tuesday, March 3, 2020  in the Check
Point building, ground floor, Hall 002, on the campus of Tel Aviv University. 
For more information on  entrance/parking please contact Riki by phone 03-6408192  
or e-mail: riki@post.tau.ac.il.

A POSTER OF THE EVENT IS ATTACHED.

Sincerely,
Eli Piasetzky, Guy Ron, Alexander Milov,  and Zvi Citron

THE PROGRAM:
-------------------------------------------
14:30 - 14:45
Refreshments

14:45 - 15:45
"Pion Polarizability Status Report"

                           Murray Moinester
                           Tel Aviv University

Abstract: Polarizabilities are well known as associated with the Rayleigh scattering cross
section of sunlight photons on atomic electrons in atmospheric N2 and O2. The oscillating
electric field of sunlight photons forces the atomic electrons to vibrate. Since the radiated
power associated with their changing electric dipole moments depends on λ-4, the intensity
of scattered and transmitted sunlight is dominated by blue and red, respectively.
Similarly, the electric απ and magnetic βπ charged and neutral pion polarizabilities characterize
the induced dipole moments of the pion during γπ Compton scattering via the interaction of
the γ’s electromagnetic field with the quark substructure of the pion. In particular, απ is the
proportionality constant between the γ’s electric field and the electric dipole moment, while βπ
is similarly related to the γ’s magnetic field and the induced magnetic dipole moment. Pion
polarizabilities affect the shape of the γπ Compton scattering angular distribution. By crossing
symmetry, the γπ→γπ  amplitudes are related to the γγ→ππ amplitudes. The polarizabilities are
basic characteristics of the pion, and are therefore of fundamental interest in the low-energy
sector of quantum chromodynamics. A stringent test of chiral perturbation theory (ChPT) is
possible based on comparisons of precision experimental pion polarizabilities with ChPT
predictions. The combination (απ-βπ) has been measured by: (1) radiative pion Primakoff
scattering (Bremsstrahlung of 190 GeV/c negative pions) in the nuclear Coulomb field of the
Ni nucleus: π- Ni → π- Ni γ, (2) two-photon fusion production of pion pairs γγ→ππ via the
e+e− → e+e−π+π− reaction at SLAC Mark-II, (3) radiative pion photoproduction from the
proton γp→ γπn at MAMI in Mainz. Only the CERN COMPASS charged pion polarizability
measurement has acceptably small uncertainties. The COMPASS polarizabilities are in good
agreement with ChPT predictions; and by Dispersion Relations with DESY Crystal Ball
γγ → π0π0 data; strengthening the identification of the pion with the Goldstone boson of chiral
symmetry breaking in QCD. This status report follows the 2019 IJMPA review by Moinester and
Scherer at https://arxiv.org/pdf/1905.05640.pdf  Links to the relevant polarizability articles are
conveniently available at https://murraymoinester.com

15:45 - 16:15
                         Coffee Break
16:15 - 17:15
"Isotopic Techniques in Geophysics: Applications to Carbon Sequestration, Climate Chronometers, and Health Physics"

                             Joel Kronfeld
                             Tel Aviv University