Abstract
Apart from the pd reaction also the scattering of antiprotons with transversal polarization PPY on deuterons with tensor polarization Pxz provides a null-test signal for time-reversal-invariance violating but parity conserving effects. Assuming that the time-reversal-invariance violating N̅N interaction contains the same operator structure as the NN interaction, we discuss the energy dependence of the null-test signal in p̅d scattering on the basis of a calculation within the spin-dependent Glauber theory at beam energies of 50-300 MeV.
Highlights
Under CPT symmetry time-reversal-invariance violating but parity conserving (TVPC) forces are considered as a possible source of CP-invariance violation, which is required to account for the matterantimatter asymmetry in the universe [1]
In contrast to effects from time-reversal-invariance violation together with parity violation such as a permanent electric dipole moment (EDM) of elementary particles, so far much less attention was paid to TVPC effects
We have performed a study of time-reversal-invariance violating but parity conserving effects in antiproton-deuteron scattering
Summary
Under CPT symmetry time-reversal-invariance violating but parity conserving (TVPC) forces are considered as a possible source of CP-invariance violation, which is required to account for the matterantimatter asymmetry in the universe [1]. Theoretical studies of the energy dependence of the expected signal were performed at energies of the planned experiment [5,6,7,8,9,10,11,12] on the basis of the spin-dependent Glauber theory and demonstrate several unexpected effects. Since the spin structure of the amplitude for pd- and pd elastic scattering is the same, it is obvious that the integrated cross section for scattering of a polarized (pyp) antiproton on tensor polarized (Pxz) deuterons provides a null-test signal for TVPC effects. In the present work the energy dependence of the null-test signal in pd scattering is studied on the basis of calculations within the spin-dependent Glauber theory using the spin-dependent pN amplitudes from a recent partial wave analysis of pp scattering [15]
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