[Olympus] FW: [Lns-students] [Lns-seminars] LNS SPECIAL Seminar w/ Dr. Weinstein TODAY @ 10:00 AM

Thu May 22 10:09:51 EDT 2014

In response to Michael's question:

The seminar is being broadcast through MIT's seminar channel.  Meeting star=
ted only five minutes ago.  Full details are at the bottom of this email, b=
ut the most relevant details are:

Community: MIT LNS
Password: LNSspecial
Meeting type: Open Meeting (Round Table)

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-Colton

________________________________________
From: lns-students-bounces at MIT.EDU [lns-students-bounces at MIT.EDU] on behalf=
 of Jeanne M Glasheen [glasheen at MIT.EDU]
Sent: Thursday, May 22, 2014 8:06 AM
Subject: [Lns-students] [Lns-seminars] LNS SPECIAL Seminar w/ Dr. Weinstein=
     TODAY @ 10:00 AM

[cid:6D5F3250-B222-43CE-9608-12317EC50E9A]

SPECIAL Seminar

THURSDAY,  May 22, 2014
10:00 AM
Kolker Room (26-414)

"Resolving the Proton Form Factor Problem with Positron-Proton Scattering"

Prof. Lawrence B. Weinstein =97 Old Dominion University

Abstract:  The proton electromagnetic form factors are essential pieces of =
our knowledge of nucleon structure.  However, unpolarized and polarized ele=
ctron scattering measurements of the proton electric form factor differ fro=
m each other by up to a factor of three at high momentum transfer. One poss=
ible resolution of this discrepancy is to include the contribution of hard =
two-photon exchange (TPE) contributions. These contributions are very diffi=
cult to calculate due to the need to integrate over all possible intermedia=
te excited-nucleon states. However, we can directly determine the TPE effec=
t by measuring the ratio of the positron-proton to electron-proton elastic =
scattering cross sections.

We have measured the ratio of positron-proton to electron-proton elastic sc=
attering cross sections over a wide range of momentum transfer and virtual =
photon polarization using a mixed simultaneous beam of electrons and positr=
ons in Hall B at Jefferson Lab. At moderate momentum transfer our measureme=
nts are consistent with the difference between the unpolarized and polarize=
d electron scattering measurements of the proton electric form factor.

web.mit.edu/lns/news/specialseminar.html

________________________________
Title: LNS Special Seminar
Description:
Community: MIT LNS
Password: LNSspecial
Meeting type: Open Meeting (Round Table)

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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Jeanne M. Glasheen
Administrative Assistant

Massachusetts Institute of Technology
Laboratory for Nuclear Science
77 Massachusetts Avenue
26-505
Cambridge, MA  02139-4307
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
617.253.2361
617.253.0111 (fax)

glasheen at mit.edu<mailto:glasheen at mit.edu>

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