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Vigilante Di Risi

Publications and source records attributed to Vigilante Di Risi.

2 recordsLinked to original sources

Defect Induced Heavy Meson Dynamics in the QCD Conformal Window

Upon introducing an heavy quark in the perturbative regime of the QCD conformal window we precisely determine the associated heavy meson spectrum and wave functions in terms of the number of light flavours and mass. We then compute the conformal Isgur-Wise function which is a central quantity in heavy quark physics. We further determine the impact of the residual low energy confining dynamics on the heavy meson spectrum. As a working framework, we adapt the heavy quark effective theory to the perturbative conformal window dynamics. Our work lays the foundations to systematically go beyond the infinite mass defect approximation in conformal field theories.

hep-ph↗

$Λ_b \rightarrow Λ_c^{\ast}$ at $1\,/\,m_c^2$ heavy quark order

We systematically compute the $Λ_b(p, s_b) \to Λ_c(2595)^+$ and $Λ_b(p, s_b) \to Λ_c(2625)^+$ form factors within the Heavy Quark Effective Theory (HQET) framework including $\mathcal{O}(1/m_c^2)$. Besides taking into account the Standard Model-like vector and axial contributions, we further determine tensor and pseudo-tensor form factors. Our work constitutes a step forward with respect to previous analyses allowing for a comprehensive study of the matrix element parametrisation stemming from the HQET formalism. Finally, we demonstrate that the resulting form factors agree well with lattice Quantum Chromodynamics (LQCD) determinations stressing the need and relevance of the newly derived $1/m_c^2$ corrections.

hep-ph↗