On the possible observation of real Pomerons

doi:10.1016/0370-2693(94)90870-2

Physics Letters B

Volume 332, Issues 1–2, 14 July 1994, Pages 136-140

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Abstract

Recent experimental (UA8) and phenomenological developments in Pomeron-exchange processes (diffraction) indicate that the Pomeron behaves like a quasi-real state(s) within the proton. Observed cross sections in proton-proton collisions are a product of a Pomeron flux factor in the proton and a Pomeron-proton cross section. We compare this situation with the well-known One-Pion-Exchange (OPE) processes, where a virtual (exchanged) pion becomes a real pion in the laboratory. In that case, observed cross sections can also be expressed as a product of a flux factor for a pion within the proton and a pion-proton cross section. In analogy with OPE, we suggest that it may be possible to produce real Pomerons in the laboratory. We suggest a number of reactions which may be used experimentally for this purpose, and discuss selection procedures and strategies.

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Cited by (4)

Measurements of single diffraction at √s = 630 GeV; Evidence for a non-linear α(t) of the pomeron
1998, Nuclear Physics B
We report measurements of the inclusive differential cross section for the single-diffractive reactions $p_{i} + p^{−} → p_{ƒ} + X$ and $p + p^{−}_{i} → X + p^{−}_{ƒ} at √s = 630 GeV$ , in the momentum transfer range 0.8 < −τ < 2.0 GeV² and final-state Feynman-x_p > 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 CERN Intersecting Storage Rings.
Prominent among these is that the effective pomeron Regge trajectory requires a term quadratic in τ, with coefficient α″ = 0.079 ± 0.012 GeV⁻⁴. We also show that the data require a pomeron-proton cross section that first decreases with increasing diffractive mass (corresponding to the PPR term in the triple-Regge expansion) and then increases at larger mass (the PPP term), similar to real particle total cross sections. We measure the product Kσ₀ = 0.72 ± 0.10 mb GeV⁻², where K is the normalization constant of the pomeron flux factor in the proton and σ₀ is the scale constant in the pomeron-proton total cross section. Finally, we report the occurrence of “beam jets” in the pomeron direction in the rest frame of the diffractive system.
Do we need two pomerons?
1995, Physics Letters B
Factorization and scaling in hadronic diffraction
1999, Physical Review D - Particles, Fields, Gravitation and Cosmology
Possible identification of double Pomeron exchange processes
1997, Modern Physics Letters A

¹: Supported by U.S. National Science Foundation Grant PHY93-03454.

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On the possible observation of real Pomerons

Abstract

Phys. Rep.

Phys. Rep.

Phys. Rep.

Ann. Rev. Nucl. Sci.

Nucl. Phys. B

Phys. Rev. Lett.

Phys. Lett. B

Phys. Lett. B

Nucl. Phys. B

Nucl. Phys. B

Nucl. Phys. B

Phys. Lett. B

Phys. Lett. B

Nucl. Phys. B

Phys. Lett. B

Phys. Rev. Lett.

Phys. Rev.

Phys. Rev. Lett.

Phys. Rev. D

Phys. Rev. D

Phys. Rev. Lett.