Measurement of central exclusive π[superscript +]π[superscript -] production in p[bar over p] collisions at √s = 0.9 and 1.96 TeV at CDF
Name
PhysRevD.91.091101.pdf
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Author(s)
Aaltonen, T.
Albrow, M.
Amerio, S.
Amidei, D.
Anastassov, A.
Annovi, A.
Antos, J.
Apollinari, G.
Appel, J. A.
Arisawa, T.
Date Issued
May 2015
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aaltonen, T., et al. "Measurement of central exclusive π[superscript +]π[superscript -] production in p[bar over p] collisions at √s = 0.9 and 1.96 TeV at CDF." Phys. Rev. D 91, 091101 (May 2015).
Version
Final published version
Abstract
We measure exclusive π[superscript +]π[superscript -] production in proton-antiproton collisions at center-of-mass energies √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 |η| < 1.3 and with no other particles detected in |η| < 5.9. We require the π[superscript +]π[superscript -] 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 M(π[superscript +]π[superscript -]) = 5000 MeV/c[superscript 2] and show resonance structures attributed to f[subscript 0] and f[subscript 2](1270) mesons. From the π[superscript +]π[superscript -] and K[superscript +]K[superscript -] spectra, we place upper limits on exclusive χ[subscript c0](3415) production.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.91.091101
