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Title: Measurement of central exclusive $$\pi^+ \pi^-$$ production in $$p\bar{p}$$ collisions at $$\sqrt{s} = 0.9$$ and 1.96 TeV at CDF

In this study, we measure exclusive π+π- production in proton-antiproton collisions at center-of-mass energies √s = 0.9 and 1.96 TeV in the Collider Detector at Fermilab. We also 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+π- 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. Furthermore, 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+π-)=5000 MeV/c2 and show resonance structures attributed to f0 and f2(1270) mesons. From the π+π- and K+K- spectra, we place upper limits on exclusive χc0(3415) production.
Authors:
 [1]
  1. Univ. of Helsinki, Helsinki (Finland); Helsinki Institute of Physics, Helsinki (Finland). et al.
Publication Date:
OSTI Identifier:
1193891
Report Number(s):
FERMILAB-PUB-15-033-PPD
Journal ID: ISSN 1550-7998; arXiv eprint number arXiv:1502.01391; TRN: US1600876
Grant/Contract Number:
AC02-07CH11359; AC02-76CH03000; AC02-06CH11357; AC02-05CH11231
Type:
Published Article
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 91; Journal Issue: 9; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society (APS)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
CDF Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS