Exploring new possibilities to discover a light pseudo-scalar at LHCb

Abstract

We study the possibility of observing a light pseudo-scalar $a$ at LHCb. We target the mass region $1\lesssim m_a\lesssim 60$ GeV and various decay channels, some of which have never been considered before: muon pairs, tau pairs, $D$ meson pairs, and di-photon. We interpret the results in the context of models of 4D Composite Higgs and Partial Compositeness in particular.

Comments: 15 pages, 13 figures, 6 tables. Final version published in EPJC