New-physics effects on triple-product correlations inΛbdecays

Abstract

We adopt an effective-lagrangian approach to compute the new-physics contributions to T-violating triple-product correlations in charmless Λ b decays. We use factorization and work to leading order in the heavy-quark expansion. We find that the standard-model (SM) predictions for such correlations can be significantly modified. For example, triple products which are expected to vanish in the SM can be enormous (∼ 50%) in the presence of new physics. By measuring triple products in a variety of Λ b decays, one can diagnose which new-physics operators are or are not present. Our general results can be applied to any specific model of new physics by simply calculating which operators appear in that model.

Measurement of matter–antimatter differences in beauty baryon decays

“…Decays of the Λ 0 b (bud) baryon to final states consisting of hadrons with no charm quarks are predicted to have non-negligible CP asymmetries in the SM, as large as 20% for certain three-body decay modes 13 . It is important to measure the size and nature of these CP asymmetries in as many decay modes as possible, to determine whether they are consistent with the CKM mechanism or, if not, what extensions to the SM would be required to explain them [14][15][16] .…”

First measurement of T -odd moments in D0→KS0Prasanth1, Libby2, Adachi3 et al. 2017Phys. Rev. D8020View full textAdd to dashboardCite

“…[6][7][8][9]. Such T -violation-sensitive measurements are complementary to direct probes of CP violation because of the differing dependence on the strong-phase difference between the contributing amplitudes [10].…”

CPTviolation and triple-product correlations inBdecays

“…Triple product (TP) correlations are known to be a good probe of CP violation in B decays [1][2][3][4][5]. Consider a B meson decaying into two vector mesons V 1 and V 2 :…”