$Λ_b \to Λ$ Form Factors from Light-Cone Sum Rules with $Λ$-Baryon Distribution Amplitudes

Fuente: arXiv
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Autores principales: Mahmoudi, F., Mishra, D.
Formato: Preprint
Publicado: 2026
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author Mahmoudi, F.
Mishra, D.
author_facet Mahmoudi, F.
Mishra, D.
contents We compute the $Λ_b \to Λ$ transition form factors using light-cone sum rules based on $Λ$-baryon distribution amplitudes, including contributions up to twist--6. The analysis is performed for pseudoscalar, vector, and axial-vector $b\to s$ currents and for different choices of the $Λ_b$ interpolating current. We find that only the pseudoscalar interpolating current leads to numerically stable and phenomenologically viable form factors. The resulting form factors are parametrised using a $z$-expansion and applied to the rare decay $Λ_b \to Λ\ell^+ \ell^-$, yielding predictions for branching ratios in the low-$q^2$ region.
format Preprint
id arxiv_https___arxiv_org_abs_2601_02302
institution arXiv
publishDate 2026
record_format arxiv
spellingShingle $Λ_b \to Λ$ Form Factors from Light-Cone Sum Rules with $Λ$-Baryon Distribution Amplitudes
Mahmoudi, F.
Mishra, D.
High Energy Physics - Phenomenology
We compute the $Λ_b \to Λ$ transition form factors using light-cone sum rules based on $Λ$-baryon distribution amplitudes, including contributions up to twist--6. The analysis is performed for pseudoscalar, vector, and axial-vector $b\to s$ currents and for different choices of the $Λ_b$ interpolating current. We find that only the pseudoscalar interpolating current leads to numerically stable and phenomenologically viable form factors. The resulting form factors are parametrised using a $z$-expansion and applied to the rare decay $Λ_b \to Λ\ell^+ \ell^-$, yielding predictions for branching ratios in the low-$q^2$ region.
title $Λ_b \to Λ$ Form Factors from Light-Cone Sum Rules with $Λ$-Baryon Distribution Amplitudes
topic High Energy Physics - Phenomenology
url https://arxiv.org/abs/2601.02302