Abstract
Study of Hadronic Hydrogen-like Atoms in the DIRAC Experiment at PS CERN
Highlights
Production of hadronic hydrogen-like atoms at high-energy collisions and method of their observation are considered
The DIRAC experiment aims to observe and study hydrogen-like atoms formed by pairs of π + π − (A2π ) and π ± K ∓ (AπK ) mesons using the 24 GeV
Combining hadrons into a hydrogen-like atom opens a unique possibility to study a property of the strong interaction at the very low relative momenta which are of the order of the atom Bohr momentum
Summary
The DIRAC experiment aims to observe and study hydrogen-like atoms formed by pairs of π + π − (A2π ) and π ± K ∓ (AπK ) mesons using the 24 GeV extracted beam of PS CERN The lifetime of these atoms is dictated by the strong interaction between the components. The final-state Coulomb interaction leads to an enhancement in production of such pairs at low relative c.m. momentum Q (“Coulomb pairs”) and to the formation of bound states or hydrogen-like atoms. In the case of breakup, characteristic “atomic pairs” emerge with a low relative momentum Q in their center of mass (Q < 3 MeV/c), and small opening angle in the laboratory frame (< 3 mrad) These pairs are the subject of observation. In all data samples, there were observed more than 21000 “atomic pairs”
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