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W&M/JLab faculty interviews<br>
<br>
Friday, Feb 5, 2016<br>
10:00 a.m. <br>
TED Bldg., Room 2561 A&B<br>
<br>
<div class="moz-forward-container"> Phiala Shanahan<br>
MIT<br>
<br>
<b>Strange and charge symmetry violating electromagnetic form
factors of the nucleon from lattice QCD</b><br>
</div>
<pshana@mit.edu><michaelp@jlab.org><br>
Since strange quark contributions to nucleon observables must
arise entirely through interactions with the vacuum, their sign
and magnitude provide key information regarding the
nonperturbative structure of the nucleon. Understanding this
structure is a grand challenge for nuclear physics and a central
focus of research at Jefferson Lab. At the present time, the
dominant uncertainty in the experimental numbers for the strange
proton form factors arises from the assumption of good charge
symmetry which informs their extraction. In fact, with
theoretical predictions of the size of charge symmetry violation
(CSV) varying through several orders of magnitude, this
uncertainty (along with the remarkable experimental challenges)
has halted certain aspects of experimental parity-violating
electron scattering programs. In this seminar I will describe
the use of dynamical 2 + 1-flavour lattice QCD simulation
results for the electromagnetic form factors of the octet
baryons, together with effective field theory methods, to
determine both the strange and CSV form factors of the nucleon
to an unprecedented level of precision. In addition, I will
present my vision for my research program which will center
around the role of hidden flavours and gluons in both hadron and
nuclear structure, as well as the 3D spatial and momentum
tomography of the nucleon, from lattice QCD. The calculation of
gluon observables in the deuteron will make contact with
experiments proposed in a JLab letter of intent, while studies
of hidden flavor in nuclei will tie in with the ATHENNA
experiment. There has recently been significant technical
progress which makes the lattice calculation of GPDs and TMDs,
which are a focus of the JLab 12GeV research program, an
achievable goal. </michaelp@jlab.org></pshana@mit.edu><br>
<br>
--------------------------------------------<br>
<br>
W&M/JLab interviews calendar:<br>
<br>
Jan. 20: Jo Dudek at JLab<br>
Jan. 21: Dudek at W&M<br>
<br>
Jan. 27: Chris Monahan at JLab<br>
Jan. 28: Monahan at W&M<br>
<br>
Feb. 4: Phiala Shanahan at W&M<br>
Feb. 5: Shanahan at JLab<br>
<br>
Feb. 10: Maxwell Hansen at JLab<br>
Feb. 11: Hansen at W&M<br>
<br>
Feb. 17: Martha Constantinou at JLab<br>
Feb. 18: Constantinou at W&M<br>
<br>
Mar. 2: Gernot Eichmann at JLab<br>
Mar. 3: Eichmann at W&M<br>
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