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2022

Dispersive analysis of $\Lambda_b \to \Lambda(1520)$ local form factors

Amhis, Yasmine, Bordone, Marzia, Reboud, Méril

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We perform an analysis of $\Lambda_b\to\Lambda(1520)$ local form factors.

We use dispersive techniques to provide a model-independent parametrisation of the form factors that can be used in the whole kinematic region.
We use lattice QCD data to constrain the free parameters in the form factors expansion, which is further constrained by endpoint relations, dispersive bounds, and SCET relations.
We analyse different scenarios, where we expand the form factors up to different orders, and their viability.

Dispersive analysis of $\Lambda_b \to \Lambda(1520)$ local form factors · Around

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G. Hiller, M. Knecht, F. Legger, and T. Schietinger, “Photon polarization from helicity suppression in radiative decays of polarized Lambda(b) to spin-3/2 baryons,” Phys. Lett. B
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W. Detmold and S. Meinel, “ Λ b → Λ ℓ + ℓ − \Lambda_{b}\to\Lambda\ell^{+}\ell^{-} form factors, differential branching fraction, and angular observables from lattice QCD with relativistic b b quarks,” Phys. Rev. D
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