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

Peter Clarke, Robert Currie, Stephan Eisenhardt, Silvia Gambetta, Franz Muheim, Matthew Needham, Marco Pappagallo, Mark Williams, LHCb Collaboration

Research output: Contribution to journalArticlepeer-review

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 languageEnglish
Article number231802
JournalPhysical Review Letters
Volume123
Issue number23
DOIs
Publication statusPublished - 6 Dec 2019

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