Measurement of central exclusive pi+pi- production in p-pbar collisions at sort(s) = 0.9 and 1.96 TeV at CDF

29 Apr 2015, 12:00
25m
BALLROOM WEST ()

BALLROOM WEST

WG2 Small-x, Diffraction and Vector Mesons WG2 Small-x, Diffraction and Vector Mesons

Speaker

Dr Michael Albrow (Fermi National Accelerator Laboratory)

Description

We measure exclusive pi+pi- production in proton-antiproton collisions at center-of-mass energies sort(s) = 0.9 and 1.96 TeV in the Collider Detector at Fermilab. We select events with two oppositely charged particles, assumed to be pions, with pseudorapidity |eta| < 1.3 and with no other particles detected in |eta| < 5.9. We require the pi+pi- system to have rapidity |y| < 1.0. The production mechanism of these events is expected to be dominated by double pomeron exchange, which constrains the quantum numbers of the central state. The data are potentially valuable for isoscalar meson spectroscopy, and for understanding the pomeron in a region of transition between nonperturbative and perturbative quantum chromodynamics. The data extend up to dipion mass 5000 MeV/c2, and show resonance structures attributed to f0 and f2(1270) mesons. From the pi+pi- and K+K- spectra we place upper limits on exclusive chi_c0(3415) production.

Primary author

Dr Michael Albrow (Fermi National Accelerator Laboratory)

Presentation Materials