Observation and investigation of πK atoms

Valeriy Yazkov

doi:10.1051/epjconf/201715803013

EPJ

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Proceedings

Open Access

EPJ Web of Conferences 158, 03013 (2017)
https://doi.org/10.1051/epjconf/201715803013

Observation and investigation of πK atoms

Valeriy Yazkov¹^* and on behalf of the DIRAC collaboration

¹ D. V. Skobeltsyn Institute of Nuclear Physics, M. V. Lomonosov Moscow State University, Leninskie Gory 1, 119991 Moscow, Russia

^* e-mail: valeri.yazkov@cern.ch

Published online: 24 October 2017

Abstract

There is accurate relation between lifetime of atoms, consisting of pion and kaon, and a difference of S-wave pion kaon scattering length with isospin 1/2 and 3/2: |a_1/2 - a_3/2 |. This difference is predicted by low energy QCD. Experiment DIRAC at CERN PS detects 349 ± 62 pairs from K⁺π⁻ and π⁺K⁻ atoms and make observation of exotic atoms consist of pion and kaons and provides way for measurement of pion-kaon scattering length difference and check of theoretical predictions.

© The authors, published by EDP Sciences, 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.