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$\Lambda_b \to \Lambda$ Form Factors from Light-Cone Sum Rules with $\Lambda$-Baryon Distribution Amplitudes
High Energy Physics - Phenomenology · Submitted 5 Jan 2026 · Published version
abstract compiled · 2026-10-30 · no language-model review
The authors' main claim We find that only the pseudoscalar interpolating current leads to numerically stable and phenomenologically viable form factors.
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The abstract, sentence by sentence
We compute the $\Lambda_b \to \Lambda$ transition form factors using light-cone sum rules based on $\Lambda$-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 $\Lambda_b$ 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 $\Lambda_b \to \Lambda \ell^+ \ell^-$, yielding predictions for branching ratios in the low-$q^2$ region.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We compute the $\Lambda_b \to \Lambda$ transition form factors using light-cone sum rules based on $\Lambda$-baryon distribution amplitudes, including contributions up to twist--6. | contribution 0.60 | 0.97 | 0.09 | asserted 1.00 |
| s1 | The analysis is performed for pseudoscalar, vector, and axial-vector $b\to s$ currents and for different choices of the $\Lambda_b$ interpolating current. | method 0.90 | 0.92 | 0.04 | asserted 0.97 |
| s2 | We find that only the pseudoscalar interpolating current leads to numerically stable and phenomenologically viable form factors. | result 1.00 | 0.96 | 0.53 | asserted 1.00 |
| s3 | The resulting form factors are parametrised using a $z$-expansion and applied to the rare decay $\Lambda_b \to \Lambda \ell^+ \ell^-$, yielding predictions for branching ratios in the low-$q^2$ region. | result 0.79 | 0.95 | 0.23 | asserted 1.00 |
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The paper
Original abstract
We compute the $\Lambda_b \to \Lambda$ transition form factors using light-cone sum rules based on $\Lambda$-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 $\Lambda_b$ 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 $\Lambda_b \to \Lambda \ell^+ \ell^-$, yielding predictions for branching ratios in the low-$q^2$ region.
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