<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p>
</p>
<div class="moz-text-html" lang="x-unicode">
</div>
Theory Center Seminar<br>
Monday, February 26, 2018<br>
<div> 1:00 p.m. (coffee at 12:45 p.m.)<br>
CEBAF Center, Room L102<br>
<br>
Mike Wagman<br>
MIT<br>
<b><br>
Interacting with Nuclei in the Standard Model and Beyond</b><br>
<b><br>
</b>In order to constrain beyond the Standard Model physics using
experiments with nuclear targets<br>
including neutrinoless double-beta decay, nuclear electric dipole
moment, and dark matter direct <br>
detection searches, the responses of nuclei to electroweak forces
and possible new physics forces <br>
must be known. Similar nuclear responses also determine nuclear
physics quantities of interest including<br>
nuclear effects on parton structure functions and input parameters
for effective theories of larger nuclei. <br>
Nuclear responses to interactions with general spin and flavor
structures can be difficult or impossible<br>
to measure experimentally, but in principle they can be accurately
predicted by the theory of quantum <br>
chromodynamics (QCD). I will present results from recent lattice
QCD calculations of a full spin-flavor <br>
decomposition of the static responses of nuclei with A=2-3 to
external currents at unphysically heavy <br>
quark masses. Efforts to extend these calculations to lighter
quark masses and larger nuclei are underway, <br>
but these calculations are made challenging in part by an
exponentially difficult signal-to-noise problem.<br>
I will also discuss ongoing work to mitigate this signal-to-noise
problem by exploiting statistical random <br>
walk behavior in the phases of complex path integrals and describe
preliminary investigations of new tools<br>
for complex scalar field theory and lattice QCD.</div>
<br>
<div>The bluejeans link for the remote connection is<a
href="https://bluejeans.com/335716039">
https://bluejeans.com/335716039</a></div>
</body>
</html>