Central Exclusive π⁺π⁻ Production in pp̄ Collisions at √s = 0.9 and 1.96 TeV at the Tevatron

¹ Forschungszentrum Jülich, 52425 Jülich, Germany
² University of Cologne, 50937 Cologne, Germany
³ Fermi National Accelerator Laboratory, 60510 Batavia, USA

^a e-mail: m.zurek@fz-juelich.de

Published online: 26 November 2014

Abstract

Exclusive π⁺π⁻ production in proton-antiproton collisions at √s = 0.9 and 1.96 TeV in the Collider Detector at Fermilab has been measured. We selected events with exactly two particles with oposite charge, in |η| < 1.3, with no other particles detected in |η| < 5.9. We require the central π⁺π⁻ to have rapidity |y| < 1. Since these events are dominated by double pomeron exchange, the quantum numbers of the central state are constrained. The data show resonance structures attributed to the f₀ and f₂ mesons.