The first amplitude analysis of the B^±→π^±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 are found to be best described by a coherent sum of five resonant structures plus a nonresonant component and a contribution from ππ↔KK S-wave rescattering. The dominant contributions in the π^± K^∓ and K^+ K^- systems are the nonresonant and the B^±→ρ(1450)^0π^± amplitudes, respectively, with fit fractions around 30%. For the rescattering contribution, a sizable 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 significant CP violation is observed in the other contributions.

Amplitude Analysis of B^±→π^±K^+K^- Decays

Veltri, M;
2019

Abstract

The first amplitude analysis of the B^±→π^±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 are found to be best described by a coherent sum of five resonant structures plus a nonresonant component and a contribution from ππ↔KK S-wave rescattering. The dominant contributions in the π^± K^∓ and K^+ K^- systems are the nonresonant and the B^±→ρ(1450)^0π^± amplitudes, respectively, with fit fractions around 30%. For the rescattering contribution, a sizable 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 significant CP violation is observed in the other contributions.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11576/2674282
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