Measurement of the pionium lifetime
M. Zhabitsky (Joint Institute for Nuclear Research, Dubna) (for the, DIRAC Collaboration)
TL;DR
This paper reports on the progress of measuring pionium lifetime at CERN, achieving 11% precision which allows for accurate determination of pion-pion scattering length differences, crucial for understanding low-energy QCD.
Contribution
The paper presents the first precise measurement of pionium lifetime using data from CERN, improving the accuracy of pion-pion scattering length differences.
Findings
Pionium lifetime measured with 11% precision
Determined |a0 - a2| with 6% accuracy
Supports theoretical predictions of low-energy QCD
Abstract
We report the progress in the measurement of the pionium lifetime by the DIRAC Collaboration at CERN (PS212). Based on data collected in 2001-2003 on Ni targets we have achieved the precision of 11% in the measurement of the pionium lifetime, which corresponds to the measurement of S-wave pion-pion scattering lengths difference |a0-a2| with the accuracy of 6%.
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Taxonomy
TopicsMuon and positron interactions and applications · Superconducting Materials and Applications · Particle physics theoretical and experimental studies