Λ_b → Λ_c^∗ at 1 / m_c² heavy quark order

2023/09/07 by Di Risi, Vigilante, Iacobacci, Davide, Sannino, Francesco
#FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2309.03553

Abstract

We systematically compute the Λ_b(p, s_b) → Λ_c(2595)⁺ and Λ_b(p, s_b) → Λ_c(2625)⁺ form factors within the Heavy Quark Effective Theory (HQET) framework including O(1/m_c²). 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_c² corrections.

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