Measurement of the πK atom lifetime and the πK scattering length

2017/07/11 by DIRAC Collaboration, B. Adeva, L. Afanasyev +82 · 11 citations
Chemistry · Physics and Astronomy · #Atom (system on chip) #Atomic physics #Chemistry #Computer science #Crystallography #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Scattering #hep-ex #nucl-ex

paper · pdf · doi:10.1103/physrevd.96.052002

published in Physical review. D/Physical review. D. 96(5) (American Physical Society) · 18 pages, 17 figures

arxiv created 2017/07/11 · openalex created_date 2017/07/21 · openalex publication_date 2017/09/19 · arxiv updated 2017/09/27 · openalex updated_date 2026/08/05

Abstract

After having announced the statistically significant observation (5.6\ensuremathσ) of the new exotic \ensuremathπK atom, the DIRAC experiment at the CERN proton synchrotron presents the measurement of the corresponding atom lifetime, based on the full \ensuremathπK data sample: \ensuremathτ=(5.5_\ensuremath-2.8^+5.0)\ifmmode×\else\texttimes\fi10^\ensuremath-15 s. By means of a precise relation (\ensuremath≈1%) between atom lifetime and scattering length, the following value for the S-wave isospin-odd \ensuremathπK scattering length a₀^\ensuremath-=(1)/(3)(a_1/2\ensuremath-a_3/2) has been derived: |a₀^\ensuremath-|=(0.072_\ensuremath-0.020^+0.031)M_\ensuremathπ^\ensuremath-1.

Citations

• Review of Particle Physics
• Determination of the S-wave π π scattering lengths from a study of K ±→π ± π 0 π 0 decays
• KScattering in Three Flavour ChPT
• Spectra and decays of π π and π K atoms
• A density-matrix kinetic equation describing the passage of fast atomic systems through matter
• Zur Quantentheorie des Atomkernes
• Contribution ofα2terms to the total interaction cross sections of relativistic elementary atoms with atoms of matter
• Coherent and incoherent atomic scattering: formalism and application to pionium interacting with matter
• On the Coulomb corrections to the total cross section of the interaction of the π+π− atom with ordinary atoms at high energy
• A new analysis of π K scattering from Roy and Steiner type equations
• Chiral perturbation theory: Expansions in the mass of the strange quark

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