# A second look at string-inspired models for proton-proton scattering via Pomeron exchange

Journal of High Energy Physics. 2018;2018(8):1-23 DOI 10.1007/JHEP08(2018)093

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Journal Title: Journal of High Energy Physics

ISSN: 1029-8479 (Online)

Publisher: SpringerOpen

Society/Institution: International School for Advanced Studies (SISSA)

LCC Subject Category: Science: Physics: Nuclear and particle physics. Atomic energy. Radioactivity

Country of publisher: Germany

Language of fulltext: English

Full-text formats available: PDF

AUTHORS

Ziyi Hu (Union College)

Brian Maddock (University of Cincinnati)

Nelia Mann (Union College)

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Time From Submission to Publication: 12 weeks

Abstract | Full Text

Abstract We re-examine a string dual model for elastic proton-proton scattering via Pomeron exchange. We argue that the method of “Reggeizing” a propagator to take into account an entire trajectory of exchanged particles can be generalized, in particular by modifying the value of a mass-shell parameter in the model. We then fit the generalized model to scattering data at large s and small t. The fitting results are inconclusive, but suggest that a better fit might be obtained by allowing the mass-shell parameter to vary. The model fits the data equally well (roughly) for a wide range of values of the mass-shell parameter, but the other fitting parameters (the slope and intercept of the Regge trajectory, and the coupling constant and dipole mass from the proton-proton-glueball coupling) are then inconsistent with what we expect. On the other hand, using the traditional method of Reggeization generates a weaker fit, but the other parameters obtain more physically reasonable values. In analyzing the fitting results, we also found that our model is more consistent with the s=1800 $$\sqrt{s}=1800$$ GeV data coming from the E710 experiment than that coming from the CDF experiment, and that our model has the greatest discrepancy with the data in the range 0.5 GeV2 < |t| < 0.6 GeV2, suggesting that the transition from soft Pomeron to hard Pomeron may occur closer to t = −0.5 GeV2 rather than t = −0.6 GeV2 as previously thought.