b --> s\ell^+\ell^- in the high q^2 region at two-loops

TL;DR

This paper presents the first analytic next-to-next-to-leading logarithmic (NNLL) calculation of matrix elements for the inclusive decay b --> X_s l^+ l^- in the high q^2 region, enhancing precision in theoretical predictions.

Contribution

It provides the first analytic NNLL calculation of matrix elements for operators O_1 and O_2 in the high q^2 region of b --> X_s l^+ l^- decay.

Findings

First NNLL analytic calculation for these matrix elements.

Improved theoretical precision for the decay process.

Focus on the high q^2 region q^2 > 4m_c^2.

Abstract

We report on the first analytic NNLL calculation for the matrix elements of the operators O_1 and O_2 for the inlusive process b --> X_s l^+l^- in the kinematical region q^2>4m_c^2, where q^2 is the invariant mass squared of the lepton-pair.