[Theory-seminars] Seminar Monday 25

[Alexei Prokudin]

Dear all,

we have a Theory Center Seminar on Monday 25th of March
CEBAF Center, Room L104
1:00 p.m.

Speaker: Nathan Hall (University of Adelaide)

Title:  Interference Radiative Corrections to the Proton's Weak Charge

Abstract:

Low energy precision experiments provide crucial tests of our understanding 
of the Standard Model of particle physics. QWEAK is one such experiment, 
aiming to measure the proton's weak charge, QWp, to within 4%. 
Unfortunately, the theoretical prediction of  QWp has been difficult to pin 
down owing to disagreements over the precise nature of certain higher-order 
radiative corrections and this has left the interpretation of future results 
subject to unwanted ambiguity. In this presentation, we examine the radiative 
corrections arising specifically from gammaZ interference and show that in fact, 
by using recent electron-deuteron parity-violating asymmetries, together with 
well-determined parton distribution functions, we can dramatically reduce the 
uncertainties associated with these corrections. Having removed such concerns, 
we provide a new estimate of both the gammaZ interference contribution and the 
revised theoretical uncertainties associated with it.



A complete list of upcoming theory seminars and talks from previous
seminars is available from:
http://www.jlab.org/div_dept/theory/seminars/

Alexei, Alvaro and Carlos
JLab Theory Seminar Organizers

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 Alexei Prokudin                    | Tel:     +1 (757) 269 5385
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