Evidence for $\pi K$-atoms with DIRAC (2009)
Adeva, B., Afanasyev, L., Allkofer, Y., Amsler, C., Anania, A., Benelli, A., ...
We present evidence for the first observation of electromagnetically bound $\pi^\pm K^\mp$-pairs ($\pi K$-atoms) with the DIRAC experiment at the CERN-PS. The $\pi K$-atoms are produced by the 24...
First measurement of the $\pi^+\pi^-$ atom lifetime (2006)
Adeva, B., Afanasyev, L., Benayoun, M., Benelli, A., Berka, Z., Brekhovskikh, V., ...
The goal of the DIRAC experiment at CERN (PS212) is to measure the $\pi^+\pi^-$ atom lifetime with 10% precision. Such a measurement would yield a precision of 5% on the value of the $S$-wave...
HadAtom05, Workshop on Hadronic Atoms (2005)
Afanasyev, L., Colangelo, G., Schacher, J.
These are the proceedings of the workshop "HadAtom05", held at the University of Bern, Switzerland, February 15 and 16, 2005. The main topics of the workshop concerned the physics of hadronic atoms,...
First measurement of the $\pi^+\pi^−$ atom lifetime (2005)
Adeva, B., Afanasyev, L., Benayoun, M., Benelli, A., Berka, Z., Brekhovskikh, V., ...
First measurement of the $\pi^+\pi^−$ atom lifetime (2005)
Adeva, B., Afanasyev, L., Benayoun, M., Benelli, A., Berka, Z., Brekhovskikh, V., ...
Dynamics of the Pionium with the Density Matrix Formalism (2004)
Afanasyev, L, Santamarina, C, Tarasov, A, Voskresenskaya, O
The evolution of pionium, the $\pi^+ \pi^-$ hydrogen-like atom, while passing through matter is solved within the density matrix formalism in the first Born approximation. We compare the influence on...
Afanasyev, L., Lanaro, A., Schacher, J.
These are the proceedings of the workshop "HadAtom02", held at the CERN, October 14 - 15, 2002. The main topic of the workshop concerned the physics of hadronic atoms and in this contest recent...
Drift chamber readout system of the DIRAC experiment (2002)
A drift chamber readout system of the DIRAC experiment at CERN is presented. The system is intended to read out the signals from planar chambers operating in a high current mode. The sense wire...
The multilevel trigger system of the DIRAC experiment (2002)
Afanasyev, L., Gallas, M., Goldin, D., Gorin, A., Karpukhin, V., Kokkas, P., ...
The multilevel trigger system of the DIRAC experiment at CERN is presented. It includes a fast first level trigger as well as various trigger processors to select events with a pair of pions having a...
Afanasyev, L., Tarasov, A., Voskresenskaya, O.
It is shown that the corrections of $\alpha^2$ order to the total cross sections for interaction of elementary hydrogen-like atoms with target atoms, reported in the previously published paper...
Afanasyev, L., Voskresenskaya, O.
The ratio of productions of pi+pi- atoms to free pi+pi- pairs is calculated with account of the strong interaction in final states. It is shown that this ratio is expressed via a squared ratio of the...
Afanasyev, L., Tarasov, A., Voskresenskaya, O.
It is shown that $\alpha^2$-term of sum rules for the total cross sections of interaction of elementary atoms with matter ones, obtained in ref.[Denisenko K. and Mrowczynski S., Phys. Rev. D36 (1987)...
Afanasyev, L., Voskresenskaya, O.
The total cross sections of interaction of relativistic \pi^+\pi^- atom with ordinary atoms are obtained in the eikonal approach, which takes into consideration all multiphoton exchange processes....