Exploring new possibilities to discover a light pseudo-scalar at LHCb
Diogo Buarque Franzosi, Giacomo Cacciapaglia, X. Cid Vidal, Gabriele Ferretti, Thomas Flacke, C. Vázquez Sierra
Abstract
Abstract We study the possibility of observing a light pseudo-scalar a at LHCb. We target the mass region $$2.5\,\mathrm{GeV}\lesssim m_a\lesssim 60\,\mathrm{GeV}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>2.5</mml:mn> <mml:mspace/> <mml:mi>GeV</mml:mi> <mml:mo>≲</mml:mo> <mml:msub> <mml:mi>m</mml:mi> <mml:mi>a</mml:mi> </mml:msub> <mml:mo>≲</mml:mo> <mml:mn>60</mml:mn> <mml:mspace/> <mml:mi>GeV</mml:mi> </mml:mrow> </mml:math> 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.