arXiv subjects

A. M. Coutinho

Publications and source records attributed to A. M. Coutinho.

2 recordsLinked to original sources

arXiv2025

Constraints on light scalars in the Aligned-two-Higgs-doublet model

In this work, we explore the viability of light-scalar scenarios within the $\mathcal{CP}$-conserving, flavour-aligned two-Higgs-doublet model (A2HDM), where at least one additional neutral or charged scalar is assumed to be lighter than the 125 GeV Higgs boson. The A2HDM naturally avoids flavour-changing neutral currents via Yukawa alignment, providing a more flexible framework than conventional $Z_2$-symmetric models. Employing the $\texttt{HEPfit}$ package within a Bayesian statistical approach, we perform global fits across all distinct light-scalar configurations, incorporating theoretical requirements and experimental constraints from electroweak precision observables, flavour data, Higgs measurements, and direct searches at the LEP and the LHC.

hep-ph↗

arXiv2023

High-precision muon decay predictions for ALP searches

We present an improved theoretical prediction of the positron energy spectrum for the polarised Michel decay $μ^+\to e^+ ν_e\barν_μ$. In addition to the full next-to-next-to-leading order correction of order $α^2$ in the electromagnetic coupling, we include logarithmically enhanced terms at even higher orders. Logarithms due to collinear emission are included at next-to-leading accuracy up to order $α^4$. At the endpoint of the Michel spectrum, soft photon emission results in large logarithms that are resummed up to next-to-next-to-leading logarithmic accuracy. We apply our results in the context of the MEG II and Mu3e experiments to estimate the impact of the theory error on the branching ratio sensitivity for the lepton-flavour-violating decay $μ^+\to e^+ X$ of a muon into an axion-like particle $X$.

hep-ph↗