CP violation in Compton scattering

Parity Violation in − → γ p Compton Scattering

Polarized beam −→γ p Compton scattering provides a theoretically clean way to extract the isovector parity violating pion-nucleon coupling constant h (1) πNN . This channel is more tractable experimentally than the recently proposed extraction of h (1) πNN from the Bedaque-Savage process — polarized target γ −→p compton scattering. The leading parity violating effect is calculated using Heavy B...

Parity Violation in γ−→p Compton Scattering

A measurement of parity-violating spin-dependent γ−→p Compton scattering will provide a theoretically clean determination of the parity-violating pionnucleon coupling constant h (1) πNN . We calculate the leading parity-violating amplitude arising from one-loop pion graphs in chiral perturbation theory. An asymmetry of ∼ 5×10−8 is estimated for Compton scattering of 100 MeV photons.

Compton Scattering in the Presence of Lorentz and CPT Violation

We examine the process of Compton scattering, in the presence of a Lorentzand CPTviolating modification to the structure of the electron. We calculate the complete tree-level contribution to the cross section; our result is valid to all orders in the Lorentz-violating parameter. We find a cross section that differs qualitatively from the Klein-Nishina result at small frequencies, and we also en...

Recoil effects and CP violation in neutron scattering.

Cp Violation

Three possibilities for the origin of CP violation are discussed: (1) the Standard Model in which all CP violation is due to one parameter in the CKM matrix, (2) the superweak model in which all CP violation is due to new physics and (3) the Standard Model plus new physics. A major goal of B physics is to distinguish these possibilities. CP violation implies time reversal violation (TRV) but di...