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+ - and ± K 
Atoms
| Leader: | L.G. Afanasyev |
| Scientific leader: | L.L. Nemenov |
+ - atoms (A2 ), to observe K atoms (A K) and
to measure their lifetime using 24 GeV proton beam. The precise
measurement of these quantities will enable us to determine the
combination of s-wave pion-pion |a0 - a2| and pion-kaon
|a1/2-a3/2| scattering lengths (with isospin 0, 2 and 1/2, 3/2,
respectively) in a model-independent way. The precision of A2
lifetime measurement will be better than 6% and the difference
|a0 - a2| will be determined within 3% or better. The accuracy of
A K lifetime measurement will be at the level of 20% and the
difference |a1/2-a3/2| will be determined at the level of 10%.
Low energy QCD predicts these values with an accuracy about 2% for the
pion-pion scattering lengths and about 10% for the K-scattering
lengths. The pion-pion and pion-kaon scattering lengths have never been
verified with experimental data with the same level of precision. For this
reason the proposed measurements will be a crucial check of the low energy
QCD predictions and our understanding of the nature of the QCD vacuum.
+K - and -K + mesons.
+ - atoms.
| List of Activities | |||||
| Activity or Experiment | Leader | ||||
| DIRAC | L.G. Afanasyev |
| |||
| Collaboration | |||
| Country or international organization | City | Institute or Laboratory | |
| CERN | Geneva | ||
| Czech Republic | Prague | CTU | |
| IP ASCR | |||
| Greece | Ioannina | UI | |
| Italy | Frascati | INFN LNF | |
| Messina | Univ. | ||
| Trieste | INFN | ||
| Japan | Kyoto | KSU | |
| Tsukuba | KEK | ||
| Tokyo | TMU | ||
| Romania | Bucharest | IAP | |
| Russia | Moscow | SINP MSU | |
| Protvino | IHEP | ||
| Spain | Santiago de Compostela | USC | |
| Switzerland | Bern | Uni Bern | |
| Basel | Uni Basel | ||
| Zurich | UZH |
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