# Amplitude analysis of B± → π±K+K− decays

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## Abstract

The first amplitude analysis of the B$^{±}$ → $\pi$$^{±}K^{+}K^{−} decay is reported based on a data sample corresponding to an integrated luminosity of 3.0fb^{−1} of pp collisions recorded in 2011 and 2012 with the LHCb detector. The data is found to be best described by a coherent sum of five resonant structures plus a nonresonant component and a contribution from \pi\pi ↔ KK S-wave rescattering. The dominant contributions in the \pi$$\pm$ and K+K−systems are the nonresonant and theB$^{±}$ → ρ(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±4±2)%,where the first uncertainty is statistical and the second systematic. No significantCPviolation is observed in the other contribution
Original language English 231802 Physical Review Letters 123 23 https://doi.org/10.1103/PhysRevLett.123.231802 Published - 6 Dec 2019

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