Prospects for direct CP tests of $hqq$ interactions

Abstract

We study the prospects for probing the CP structure of $hqq$ interactions using the decays of the lightest baryon $\hat{I}{›}_q$ formed in the quark's hadronization. The low yields of reconstructible events make it unlikely for tests to be performed with the next generation of colliders. In $h\to b\bar{b}\to \hat{I}{›}_b\bar{\hat{I}}{›}_b$ decays a CP-sensitive distribution could be measured with a high-luminosity $e^{+}{e}^{-}$ collider, while in both $h\to b\bar{b}\to \hat{I}{›}_b\bar{\hat{I}}{›}_b$ and $h\to c\bar{c}\to \hat{I}{›}_c\bar{\hat{I}}{›}_c$ decays such a distribution could be measured with a very high luminosity $\hat{I}{¼}^{+}\hat{I}{¼}^{-}$ collider. However, we find that only the $\hat{I}{¼}^{+}\hat{I}{¼}^{-}$ collider can produce enough $h\to b\bar{b}\to \hat{I}{›}_b\bar{\hat{I}}{›}_b$ decays to probe a physical CP asymmetry in the $hbb$ vertex.

19 pages, 4 figures