Null-test signal for T-invariance violation in $pd$ scattering

Abstract

The integrated proton-deuteron cross section $\tilde{\sigma }$ for the case of the incident proton vector polarization $p_y^p$ and tensor polarization $P_{xz}$ of the deuteron target provides a null test signal for time-reversal invariance violating but P-parity conserving (TVPC) effects. We study the null-test observable $\tilde{\sigma }$ within the Glauber theory of the double-polarized $pd$ scattering. Full spin dependence of the ordinary strong $pN$ scattering amplitudes and different types of the hypothetical TVPC pN-amplitudes are taken into account. We show that the contribution from the exchange of the lowest-mass meson allowed in the TVPC interaction, i.e. the $\rho$-meson, to the null-test observable $\tilde{\sigma }$ is zero. The axial $h_1$ meson exchange makes a non-zero contribution. We find that inclusion of the Coulomb interaction does not lead to divergence of the cross section $\tilde{\sigma }$ and calculate its energy dependence at the proton beam energy 100-1000 MeV.

Comments: 12 pages, 3 figures, to appear in Phys.Rev.C