[hep-ph/9704404] Nonlinearities and Pomeron Nonfactorizability in Conventional Diffraction

High Energy Physics - Phenomenology, abstract hep-ph/9704404



From: martynov@gluk.apc.org

Date: Fri, 25 Apr 1997 02:57:28 +0200 (EET)   (62kb)



Nonlinearities and Pomeron Nonfactorizability in Conventional Diffraction

Authors: P.Desgrolard , A.I.Lengyel , E.S.Martynov
Comments: Plain TeX, 24 pages, 6 eps figures, to be published in Nuovo Cimento
Report-no: LYCEN RI9640
Journal-ref: Nuovo Cim. A110 (1997) 251-266
Alternatives for describing the nonlinear behavior of the first diffraction cone in differential $pp$ and $\bar pp$ elastic cross-section are investigated. High quality fits to the data are presented. We show that the presence in the Pomeron amplitude of two terms with different $t$ dependences is strongly suggested by the data, hinting at a non-factorizable Pomeron even in the field of purely hadronic reactions. The available data, however, do no allow to choose among a nonlinearity in the residues or in the Pomeron trajectory or in both. In all cases, we find an effective slope of the trajectory larger than the one currently used. A nonlinear trajectory with the fitted parameters is used for predicting the mass and the width of the 2$^{++}$ glueball. An excellent agreement is found with the X(1900) candidate from the WA91 experiment.

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