Heidelberg 2022 – scientific programme

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T: Fachverband Teilchenphysik

T 56: Flavour Physics 4

T 56.8: Talk

Wednesday, March 23, 2022, 18:00–18:15, T-H15

Dispersive bounds for local form factors of Λ_b → Λ — Thomas Blake¹, Stefan Meinel², •Muslem Rahimi³, and Danny van Dyk⁴ — ¹Department of Physics, University of Warwick, UK — ²Department of Physics, University of Arizona, USA — ³Center for Particle Physics Siegen, Theoretische Physik 1, Universität Siegen, Germany — ⁴Physik Department T31, Technische Universität München, Germany

We investigate the 10 form factors relevant to the b-baryon decay Λ_b → Λ ℓ⁺ℓ⁻ by combining information of Lattice QCD and dispersive bounds. To this end, we use a parametrization of the local form factors in terms of orthonormal polynomials with respect to the dispersive integral kernel. Our approach provides control over the form factor uncertainties due to truncation of the series expansion and extrapolation to the region of low momentum transfer, which is of great phenomenological interest.