Central Exclusiveπ+π−Production inpp̄Collisions at √s= 0.9 and 1.96 TeV at the Tevatron

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.