# Amplitude analysis of $B^\pm \to \pi^\pm K^+ K^-$ decays

## TL;DR

This paper presents the first amplitude analysis of the decay $B^\pm o \pi^\pm K^+ ext{ extminus}K^-$, revealing complex resonant structures, significant rescattering effects, and the largest $CP$ asymmetry observed in a single amplitude.

## Contribution

It introduces the first detailed amplitude analysis of this decay mode, identifying key resonant and nonresonant contributions and measuring a record $CP$ asymmetry in rescattering.

## Key findings

- Resonant and nonresonant components describe the decay dynamics.
- Largest $CP$ asymmetry in a single amplitude reported as -66%.
- No significant $CP$ violation in other contributions.

## Abstract

The first amplitude analysis of the $B^\pm \to \pi^\pm K^+ K^-$ decay is reported based on a data sample corresponding to an integrated luminosity of 3.0 fb$^{-1}$ of $pp$ collisions recorded in 2011 and 2012 with the LHCb detector. The data is found to be best described by a coherent sum of five resonant structures plus a nonresonant component and a contribution from $\pi\pi \leftrightarrow KK$ $S$-wave rescattering. The dominant contributions in the $\pi^\pm K^\mp$ and $K^{+}K^{-}$ systems are the nonresonant and the $B^\pm \to \rho(1450)^{0}\pi^{\pm}$ amplitudes, respectively, with fit fractions around $30\%$. For the rescattering contribution, a sizeable fit fraction is observed. This component has the largest $CP$ asymmetry reported to date for a single amplitude of $(-66 \pm 4 \pm 2)\%$, where the first uncertainty is statistical and the second systematic. No significant $CP$ violation is observed in the other contributions.