Self-cancelation of a scalar in neutral meson mixing and implications for LHC

TL;DR

This paper explores how natural cancellations in scalar contributions affect neutral meson mixing and investigates potential new production mechanisms for scalars at the LHC, focusing on models with scalar and pseudoscalar couplings.

Contribution

It demonstrates the possibility of self-cancellation in scalar contributions within multi-Higgs models and examines implications for LHC scalar production.

Findings

Partial cancellation in BGL models reduces flavor-changing effects

Scalar and pseudoscalar couplings enable self-cancellation

Potential new scalar production channels at LHC identified

Abstract

Flavour changing neutral scalar interactions are a standard feature of generic multi Higgs models. These are constrained by mixing in the neutral meson systems. We consider situations where there are natural cancellations in such contributions. In particular, when the spin 0 particle has both scalar and pseudoscalar couplings, one may have a self-cancellation. We illustrate one such partial cancellation with BGL models. We also inquire whether the flavour changing quark interactions can lead to new production mechanisms for a neutral scalar at LHC.