[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Monday, February 26, 2018
1:00 p.m. (coffee at 12:45 p.m.)
CEBAF Center, Room L102

Mike Wagman
MIT
*
Interacting with Nuclei in the Standard Model and Beyond*
*
*In order to constrain beyond the Standard Model physics using 
experiments with nuclear targets
including neutrinoless double-beta decay, nuclear electric dipole 
moment, and dark matter direct
detection searches, the responses of nuclei to electroweak forces and 
possible new physics forces
must be known. Similar nuclear responses also determine nuclear physics 
quantities of interest including
nuclear effects on parton structure functions and input parameters for 
effective theories of larger nuclei.
Nuclear responses to interactions with general spin and flavor 
structures can be difficult or impossible
to measure experimentally, but in principle they can be accurately 
predicted by the theory of quantum
chromodynamics (QCD). I will present results from recent lattice QCD 
calculations of a full spin-flavor
decomposition of the static responses of nuclei with A=2-3 to external 
currents at unphysically heavy
quark masses. Efforts to extend these calculations to lighter quark 
masses and larger nuclei are underway,
but these calculations are made challenging in part by an exponentially 
difficult signal-to-noise problem.
I will also discuss ongoing work to mitigate this signal-to-noise 
problem by exploiting statistical random
walk behavior in the phases of complex path integrals and describe 
preliminary investigations of new tools
for complex scalar field theory and lattice QCD.

The bluejeans link for the remote connection 
ishttps://bluejeans.com/335716039 <https://bluejeans.com/335716039>
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