[Theory-seminars] Physics Colloquia Schedule for 2/18 to 2/22

[Mary Fox]

________________________________
From: Wilkinson, Ellie V <evwilk at wm.edu>
Sent: Monday, February 18, 2019 4:50 PM
To: physics2017 at physics.wm.edu
Cc: undergrads2017 at physics.wm.edu
Subject: Physics Colloquia Schedule for 2/18 to 2/22


Physics Colloquium

Wednesday, February 20, 2019

4:00 PM

Small Hall, Room 111



Jeremy Green [Host J. Dudek]

Deutsches Eletronen-Synchrotron, Germany

Title of Talk:  “Calculating the quark substructure of the proton and neutron”

Abstract:
Protons and neutrons (together called nucleons) are the basic building blocks of ordinary matter, along with electrons. Unlike electrons, they are not fundamental particles in the Standard Model of particle physics — they are bound states of quarks and gluons interacting as described by the theory of quantum chromodynamics (QCD). Because QCD is strongly coupled at low energies, it is difficult to determine the structure of nucleons from first principles. This can be done using lattice QCD: a formulation of QCD suitable for performing calculations on supercomputers, which provides a way to calculate nucleon structure with controllable uncertainties.



In this talk I will discuss some basic properties of nucleons such as the proton radius (which is the subject of a large disagreement between different experiments), and how they can be computed using lattice QCD. I will give an overview of the current status of these calculations, and present some progress in understanding the role that strange quarks play in nucleons.

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Physics Colloquium

Friday, February 22, 2019

4:00 PM

Small Hall, Room 111



Jacobo Ruiz de Elvira [Host: K. Orginos]

University of Bern, Switzerland

Title of Talk:  “Strong interactions and the precision frontier of Hadron Physics”

Abstract:
Although QCD is well established as the theory of strong interactions, the hadron spectrum is still not understood from first principles. Nevertheless, the understanding of strong interactions with high precision has become in recent years a prerequisite for progress in nuclear and particle physics in many different areas. Dispersion relations are a consequence of causality, which mathematically translates into analyticity conditions on scattering amplitudes.

In this talk, I will show how the fruitful combination of dispersion-theoretical methods with modern high-precision experimental data allows one to determine low-energy hadron observables with unprecedented accuracy. I will highlight this area of current research with two examples: pion-pion(kaon) scattering and the role of the lightest scalars mesons; 2. the mass of the nucleon and its connection to pion-nucleon scattering.

Cookies & Coffee will be served in Small 122 at 3:30pm

Cheers,



Ellie Wilkinson

William & Mary

Physics Admin

evwilk at wm.edu<mailto:evwilk at wm.edu>

757-221-3503








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