Measurements of Single Diffraction at sqrt(s) = 630 GeV; Evidence for a NonLinear alpha(t) of the Pomeron
Abstract
We report measurements of the inclusive differential cross section for the singlediffractive reactions: p + pbar > p + X and p + pbar > X + pbar at sqrt(s) = 630 GeV, in the momentum transfer range, 0.8 < t < 2.0 GeV^2 and final state Feynmanx > 0.90. Based on the assumption of factorization, several new features of the Pomeron Flux Factor are determined from simultaneous fits to our UA8 data and lower energy data from the CHLM collaboration at the CERNIntersecting Storage Rings. Prominent among these is that the effective Pomeron Regge trajectory requires a term quadratic in t, with coefficient, a'' = 0.079 + 0.012 GeV^{4}. We also show that the data require a Pomeronproton cross section that first decreases with increasing diffractive mass (corresponding to the PPR term in the tripleRegge expansion) and then increases at larger mass (the PPP term), similar to real particle total cross sections. We measure the product, (K x sigma0) = 0.72 + 0.10 mb/GeV^2, where K is the normalization constant of the Pomeron Flux Factor in the proton and sigma0 is the scale constant in the Pomeronproton total cross section. Finally, we report the occurence of ``beam jets'' in the Pomeron direction in the rest frame of the diffractive system.
 Publication:

arXiv eprints
 Pub Date:
 October 1997
 DOI:
 10.48550/arXiv.hepex/9710004
 arXiv:
 arXiv:hepex/9710004
 Bibcode:
 1997hep.ex...10004U
 Keywords:

 High Energy Physics  Experiment;
 High Energy Physics  Phenomenology
 EPrint:
 68 pages, 37 Encapsulated Postscript figures, LaTex