[Theory-seminars] Postdoc interviews. TODAY

[Cesar Fernandez-Ramirez]

Dear all,

today we have three postdoc interviews in room L102 starting at 1pm.

Please find enclosed, speakers, titles and abstracts.


- Time: 1pm
- Speaker: Vladyslav Pauk
- Title: Light-by-light scattering and the anomalous magnetic moment of the muon
- Abstract: The process of two-photon production of hadrons has been playing a vital role in studying the strong interaction physics during the past few decades. Since the process is essentially non-perturbative in nature, the general constraints based on analyticity and unitarity become highly important for the interpretation of the phenomenon. A new approach based on sum rules for light-by-light scattering will be presented and applications for a number of problems related to both perturbative field theory and hadronic physics will be discussed in detail. 
The keen interest to the anomalous magnetic moment of muon is motivated by its high potential for probing physics beyond Standard Model. However, the interpretation of the quantity is undermined by large hadronic uncertainties. In view of the new muon (g-2) experiments at Fermilab and at J-PARC, a new dispersive formalism for evaluating the hadronic light-by-light (HLbL) scattering contribution to the muon's anomalous magnetic moment  will be presented. We provide a first realistic application of the proposed formalism to the case of pseudoscalar meson pole exchanges. Moreover, it allows for a more straightforward implementation of the experimental data. The ongoing measurements by the BES-III Collaboration will be a crucial input into the presented dispersive formalism.

- Time: 1.50pm
- Speaker: Wim Cosyn
- Title: The nucleus at short distances
- Abstract: Scattering reactions at intermediate energies with nuclear targets are 
indispensable in our quest to unravel the nature of the strong force at 
hadronic length scales.  They offer access to modifications of hadrons 
in the nuclear medium, are used in the flavor separation of parton 
distribution functions, and teach us about hadronization and the 
short-range structure of nuclei.  Concentrating on the topics of nuclear 
final-state interactions and short-range correlations, I highlight 
several contributions from my research to these studies.  Second, I 
discuss future research possibilities in this domain and show its 
importance and benefit for the JLab12 nuclear program and other 
intermediate energy experimental facilities.


- Time: 2.40pm
- Speaker: Xian-Wei KANG
- Title: Antinucleon-nucleon scattering in chiral EFT and the related hadron physics.
- Abstract: The recent progress of the antinucleon-nucleon (NNbar) interaction in chiral EFT will be reported. 
With such NNbar potential, we show that the experimental observation of the near-threshold enhancement 
for the proton-antiproton (ppbar) spectra from various decay channels can be understood as the 
final-state (ppbar) interaction effects.

-- 
César Fernández-Ramírez

Theory Center -- Jefferson Lab
12000 Jefferson Ave., Newport News, VA 23606, USA

Phone: (+1) 757-269-7844
Fax: (+1) 757-269-7002
E-mail: cesar at jlab.org