[Jlabsa_gs] Pizza Seminar Rescheduled - Wednesday, January 29, 2014 - A Message From Hari Areti

Jodi Patient patient at jlab.org
Fri Jan 24 10:15:21 EST 2014


Thank you to those who RSVPed for the Pizza Seminar this week, but it had to be
postponed because of the weather.  Please RSVP again if you are able to attend 
next week.     


Jefferson Lab's Graduate Student and Post-Doc Association Wiki:
  https://gspda.jlab.org/wiki/index.php/Main_Page

         Please RSVP to:  patient at jlab.org by COB on January 27, 2014

                         Wednesday, January 29, 2014

                                 ***Auditorium***

                                  12:00-1:00 pm


"An Outlook on Beam Normal Single Spin Asymmetry in Electron Nucleon Scattering"


                               Buddhini Waidyawansa

                              Postdoctoral Associate
                                  Jefferson Lab

                    

Abstract:  A beam normal single spin asymmetry, B_n, is generated by the scattering
of transversely polarized electrons from unpolarized targets. This parity conserving
observable provides direct access to the imaginary part of the two photon exchange
amplitude. Because it can be calculated from the sum of the amplitudes for all on-shell
intermediate states, a measurement provides an integral test of our understanding of
the fundamental gamma + nucleon --> X  processes. In addition this observable is also
of special interest to experiments making precision parity-violating asymmetry
measurements because small amounts of residual transverse polarization in the beam can
lead to percent-level corrections. However, B_n is highly suppressed hence is only
accessible with apparatus designed to measure asymmetries at the few percent level.
I will discuss the theoretical and experimental status of beam normal single spin
asymmetry and their implications on the two-photon exchange theories.


  



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