[Jlab-seminars] Physics Seminar: Craig Roberts; The Mass at the Heart of Matter

[Stephanie Tysor]

Physics Seminar 




Craig Roberts 



Argonne National Laboratory 



The Mass at the Heart of Matter 



Abstract: 



QCD is the first theory whose treatment demands a full resolution of the conflicts generated by joining relativity and quantum mechanics. In attempting to match QCD with Nature, it is necessary to confront the many complexities of strong, nonlinear dynamics in relativistic quantum field theory, e.g. the loss of particle number conservation, the frame and scale dependence of the explanations and interpretations of observable processes, and the evolving character of the relevant degrees-of-freedom. The peculiarities of QCD suggest that it is also the only known fundamental theory with the capacity to sustain massless elementary degrees-of-freedom, gluons and quarks; and yet gluons and quarks are predicted to acquire mass dynamically so that the only massless systems in QCD are its composite Nambu-Goldstone bosons. All other everyday bound states possess nuclear-size masses, far in excess of anything that can directly be tied to the Higgs boson. These points highlight a range of fundamental questions within the Standard Model, namely: what is the source of the mass for the vast bulk of visible matter in the Universe, how is its appearance connected with confinement; how is this mass distributed within hadrons and does the distribution differ from one hadron to another? This presentation will provide a perspective on the strong-QCD landscape, emphasising features of its running coupling and masses, how they are expressed in a hadron observables, and sketching their connection with answers to these critical questions. 






Friday, June 1, 2018 




11:00am 




CEBAF Auditorium 




Upcoming Seminar Speakers 
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July 24 th : Crystal Bailey 

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Stephanie Tysor 
Hall A Administrative Assistant 
Thomas Jefferson National Accelerator Facility 
(office)757-269-6005 (fax)757-269-5235 
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