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Investigation of atoms, consisting of pi+pi-, K+pi- and pi+K- at DIRAC experiment in order to check predictions of QCD at low energiesстатья
- Автор: Yazkov V.
- Сборник: Pos (QFTHEP 2013)
- Том: 2013
- Год издания: 2014
- Первая страница: 014-1
- Последняя страница: 014-13
- Аннотация: The lifetime of pi+pi- mesons and difference of S-wave pion-pion scattering lengths with isospin 0 and 2 have been measured in experiment DIRAC at CERN with accuracy 4.3% on the base of 21000 atomic pairs collected in 2001-2003. In 2010 the DIRAC collaboration has finished data taking in order to observe K+pi- and pi+K- and to make estimation of their lifetime. This opens possibility to check prediction of QCD at low energy for S-wave pion-kaon scattering lengths. Also essential amount of pi+pi- atomic pairs (~22000) was taken. Now they used for calibration of the experimental setup, but in future we intend to improve accuracy of pion-pion scattering length measurement. In 2012 data sample for search of long-lived pi+pi- atoms has been collected. Observation of such atoms allows to investigate possibility to measure Lamb shift in pi+pi- atoms. DIRAC experiment has been performed at PS CERN (proton beam energy 24 GeV). Results of simulation shows that essential gain in yield of pi+pi- and piK atoms could be achieved if measurement would be performed at 450 GeV proton beam (SPS CERN).
- Добавил в систему: Язьков Валерий Викторович