Measurement of Central Exclusive $$\pi^+ \pi^-$$ Production in $$p-\bar{p}$$ Collisions at $$\sqrt{s} = 0.9$$ and 1.96 TeV at CDF
- Fermilab
We have measured exclusive π + π - production in proton-antiproton collisions at center-of- mass energies $$\sqrt{s}$$ = 0.9 and 1.96 TeV in the Collider Detector at Fermilab. We sel ected 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 required the π + π - system to have rapidity | y | < 1.0. The production mechanism of these hadrons is dominated by do uble 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 r egion of transition between non- perturbative and perturbative quantum chromodynamics. Th e data extend up to dipion mass 5000 MeV/$c^2$ , and show resonance structures attributed to $$f_0$$ and $$f_2$$ (1270) mesons. We place upper limits on exclusive $$χ_{c0}$$(3415) production using the π + π - and K + K - decay channels
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1250815
- Report Number(s):
- FERMILAB-CONF-15-319-E; 1419371
- Journal Information:
- PoS, Vol. DIS2015; Conference: 23rd International Workshop on Deep-Inelastic Scattering and Related Subjects, Dallas, Texas, United States, 04/27-05/01/2015
- Country of Publication:
- United States
- Language:
- English
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