Blunden, P.Melnitchouk, W.Thomas, A.2013-03-252013-03-252012Physical Review Letters, 2012; 109(26):1-50031-90071079-7114http://hdl.handle.net/2440/76218We present a new dispersive formulation of the γZ box radiative corrections to weak charges of bound protons and neutrons in atomic parity violation measurements on heavy nuclei such as ¹³³Cs and ²¹³Ra. We evaluate for the first time a small but important additional correction arising from Pauli blocking of nucleons in a heavy nucleus. Overall, we find a significant shift in the γZ correction to the weak charge of ¹³³Cs, approximately 4 times larger than the current uncertainty on the value of sin²θ[sub]W, but with a reduced error compared to earlier estimates.en© 2012 American Physical SocietyJournal article002012380010.1103/PhysRevLett.109.2623010003129328000062-s2.0-8487178611322094Thomas, A. [0000-0003-0026-499X]