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Theory Center Seminar<br>
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<div>Monday, February 26<br>
1:00pm<br>
CEBAF Center, Room L102<br>
<font color="#0f61c8"><b><br>
</b></font><b><span style="font-size: 13px;">Mike Wagman (MIT)</span></b><br>
<font size="2"><b>Interacting with Nuclei in the Standard Model
and Beyond</b></font><br>
<font size="2">In order to constrain beyond the Standard Model
physics using<br>
experiments with nuclear targets including neutrinoless
double-beta<br>
decay, nuclear electric dipole moment, and dark matter direct<br>
detection searches, the responses of nuclei to electroweak
forces and<br>
possible new physics forces must be known. Similar nuclear
responses<br>
also determine nuclear physics quantities of interest
including<br>
nuclear effects on parton structure functions and input
parameters for<br>
effective theories of larger nuclei. Nuclear responses to
interactions<br>
with general spin and flavor structures can be difficult or
impossible<br>
to measure experimentally, but in principle they can be
accurately<br>
predicted by the theory of quantum chromodynamics (QCD). I
will<br>
present results from recent lattice QCD calculations of a full<br>
spin-flavor decomposition of the static responses of nuclei
with A=2-3<br>
to external currents at unphysically heavy quark masses.
Efforts to<br>
extend these calculations to lighter quark masses and larger
nuclei<br>
are underway, but these calculations are made challenging in
part by<br>
an exponentially difficult signal-to-noise problem. I will
also<br>
discuss ongoing work to mitigate this signal-to-noise problem
by<br>
exploiting statistical random walk behavior in the phases of
complex<br>
path integrals and describe preliminary investigations of new
tools<br>
for complex scalar field theory and lattice QCD.</font></div>
<br>
<div>The bluejeans link for the remote connection is</div>
<div><a href="https://bluejeans.com/335716039">https://bluejeans.com/335716039</a></div>
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