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Web Page
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M. Albrow, A. Swiech, M. Zurek
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| Abstract |
It has been known since the days of the Intersecting Storage Rings, ISR, at
CERN, that one can have pp interaction with more than one pomeron, P,
exchanged, known as double pomeron exchange. Exclusive hadronic systems,
produced by double pomeron exchange, DPE, have the potential of opening a
rich new window on hadron spectroscopy and diffraction mechanism. We have
studied events of the type pbar-p to p + X + pbar where X is a hadron pair
(mostly pi+ pi-) at sqrt(s) = 900 GeV and 1960 GeV in the Collider Detector
at Fermilab (CDF). The hadron pair is central, eta < 1, and between two
rapidity gaps Delta etaabout 4. The dominant process is double pomeron
exchange, DPE, with restrictions on the quantum numbers of X: Q = S = 0,
C = +1, J = 0 or 2. The mass spectra, with about 500K candidate events
assumed to be pi+ pi-, shows strong resonant structures attributed to f0 and
f2 states. We give the ratio of cross sections at sqrt(s) = 900 GeV and 1960
GeV, and compare with Regge expectations. After selecting high pt pions we
analyze central exclusive production of chi_c.
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| Comments |
Last Update: August 2012 Dataset: 900/1960
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