[Jlabsa_gs] **Reminder** Pizza Seminar - Wednesday, August 20, 2014 - A Message From Hari Areti
Jodi Patient
patient at jlab.org
Mon Aug 18 08:12:43 EDT 2014
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 August 18, 2014
Wednesday, August 20, 2014
***F113***
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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