In physics, the pomeron is a Regge trajectory — a family of particles with increasing spin — postulated in 1961 to explain the slowly rising cross section of hadronic collisions at high energies.[1] It is named after Isaak Pomeranchuk.


While other trajectories lead to falling cross sections, the pomeron can lead to logarithmically rising cross sections — which, experimentally, are approximately constant ones. The identification of the pomeron and the prediction of its properties was a major success of the Regge theory of strong interaction phenomenology. In later years, a BFKL pomeron[1] was derived in further kinematic regimes from perturbative calculations in QCD, but its relationship to the pomeron seen in soft high energy scattering is still not fully understood.

One consequence of the pomeron hypothesis is that the cross sections of proton–proton and proton–antiproton scattering should be equal at high enough energies. This was demonstrated by the Soviet physicist Isaak Pomeranchuk by analytic continuation assuming only that the cross sections do not fall. The pomeron itself was introduced by Vladimir Gribov, and it incorporated this theorem into Regge theory. Geoffrey Chew and Steven Frautschi introduced the pomeron in the West. The modern interpretation of Pomeranchuk's theorem is that the pomeron has no conserved charges—the particles on this trajectory have the quantum numbers of the vacuum.

The pomeron was well accepted in the 1960s despite the fact that the measured cross sections of proton–proton and proton–antiproton scattering at the energies then available were unequal.

The pomeron carries no charges. The absence of electric charge implies that pomeron exchange does not lead to the usual shower of Cherenkov radiation, while the absence of color charge implies that such events do not radiate pions.

This is in accord with experimental observation. In high energy proton–proton and proton–antiproton collisions in which it is believed that pomerons have been exchanged, a rapidity gap is often observed: This is a large angular region in which no outgoing particles are detected.

The odderon, the counterpart of the pomeron that carries odd charge parity was introduced in 1973 by Leszek Łukaszuk and Basarab Nicolescu.[2] It was potentially observed only in 2017 by the TOTEM experiment at the LHC.[3] Odderon exists in QCD as compound state of 3 reggeized gluons.[4]
String theory

In early particle physics, the 'pomeron sector' was what is now called the 'closed string sector' while what was called the 'reggeon sector' is now the 'open string theory'.
See also

Giuseppe Cocconi


Levin, E. (1997). "Everything about reggeons. Part I: Reggeons in "soft" interaction".arXiv:hep-ph/9710546.
Łukaszuk, Leszek; Nicolescu, Basarab (1973). "A possible interpretation of pp rising total cross-sections". Lettere al Nuovo Cimento. 8 (7): 405–413. doi:10.1007/bf02824484.
Martynov, Evgenij; Nicolescu, Basarab (2018). "Did TOTEM experiment discover the Odderon?". Physics Letters B. 778: 414–418.arXiv:1711.03288. Bibcode:2018PhLB..778..414M. doi:10.1016/j.physletb.2018.01.054.

Martynov, Evgenij; Nicolescu, Basarab (March 2018). "Did TOTEM experiment discover the Odderon?". Physics Letters B. 778: 414–418.arXiv:1711.03288. Bibcode:2018PhLB..778..414M. doi:10.1016/j.physletb.2018.01.054. ISSN 0370-2693.

Further reading

Nachtmann, Otto (2003). "Pomeron Physics and QCD". New Trends in Hera Physics. pp. 253–267.arXiv:hep-ph/0312279. Bibcode:2004nthp.conf..253N. doi:10.1142/9789812702722_0023. ISBN 978-981-238-835-3.
Donnachie, Sandy; Dosch, H. Günter; Landshoff, Peter V.; Nachtmann, Otto (2002). Pomeron Physics and QCD. Cambridge Monographs on Particle Physics, Nuclear Physics and Cosmology. Cambridge University Press. ISBN 978-0-521-78039-1.

External links

Pomerons at Fermilab


Particles in physics

Up (quark antiquark) Down (quark antiquark) Charm (quark antiquark) Strange (quark antiquark) Top (quark antiquark) Bottom (quark antiquark)


Electron Positron Muon Antimuon Tau Antitau Electron neutrino Electron antineutrino Muon neutrino Muon antineutrino Tau neutrino Tau antineutrino


Photon Gluon W and Z bosons


Higgs boson

Ghost fields

Faddeev–Popov ghosts


Gluino Gravitino Photino


Axino Chargino Higgsino Neutralino Sfermion (Stop squark)


Axion Curvaton Dilaton Dual graviton Graviphoton Graviton Inflaton Leptoquark Magnetic monopole Majoron Majorana fermion Dark photon Planck particle Preon Sterile neutrino Tachyon W′ and Z′ bosons X and Y bosons


Proton Antiproton Neutron Antineutron Delta baryon Lambda baryon Sigma baryon Xi baryon Omega baryon


Pion Rho meson Eta and eta prime mesons Phi meson J/psi meson Omega meson Upsilon meson Kaon B meson D meson Quarkonium

Exotic hadrons

Tetraquark Pentaquark


Atomic nuclei Atoms Exotic atoms
Positronium Muonium Tauonium Onia Pionium Superatoms Molecules


Hexaquark Heptaquark Skyrmion


Glueball Theta meson T meson


Mesonic molecule Pomeron Diquark R-hadron


Anyon Davydov soliton Dropleton Exciton Hole Magnon Phonon Plasmaron Plasmon Polariton Polaron Roton Trion


Baryons Mesons Particles Quasiparticles Timeline of particle discoveries


History of subatomic physics
timeline Standard Model
mathematical formulation Subatomic particles Particles Antiparticles Nuclear physics Eightfold way
Quark model Exotic matter Massless particle Relativistic particle Virtual particle Wave–particle duality Particle chauvinism

Wikipedia books

Hadronic Matter Particles of the Standard Model Leptons Quarks

Physics Encyclopedia



Hellenica World - Scientific Library

Retrieved from ""
All text is available under the terms of the GNU Free Documentation License