Edinburgh Research Explorer

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

Research output: Contribution to journalArticle

Original languageEnglish
Article number231802
JournalPhysical Review Letters
Issue number23
Publication statusPublished - 6 Dec 2019


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

ID: 155214120