Dipole Pomeron Research Articles

Phenomenology of Elastic Hadron Diffraction

Recent experimental data on high-energy elastic scattering of hadrons is reviewed in the light of various theoretical models with special emphasize on the dipole (or geometrical) Pomeron. As suggested by its name, this model combines the properties of two different approaches: the analytic and geometric ones. Its virtue is simplicity, which makes possible analytic calculation of many complicated problems.

Dipole pomeron model and recent results on K-p elastic scattering

The differential cross section data for high energy K-p elastic scattering showing a break near -t=4(GeV/c)2 have been fitted for pL=20, 100 and 200GeV/c with -t extended up to 14(GeV/c)2 by using a dipole pomeron model.

Dipole Pomeron Model and Recent Results on pp Elastic Scattering

The dipole pomeron model has been used to fit the recent differential cross section data for pp elastics scattering.

Dipole Pomeron and Formulap Elastic Scattering at Collider Energies

It is shown that a very recent dipole pomeron fit which describes pp elastic scattering in the 50~280 GeV/c region for -t ≤5 (GeV/c)2 fails at collider energies. A general discussion of dipole pomeron fits is carried out.

The dipole pomeron and the 540 GeV collider data

A critical assessment of the dipole pomeron model with linear and curved trajectories is conducted. It is argued that the former version appears to be eliminated by the collider data. The latter version, however, could be regarded as a serious candidate for the description of the data after some modification.

Proton-Amtiprotom Elastic Scattering at High Energies

The differential cross sections for high energy elastic scattering showing structure near for and together with total cross sections for , and with extending up to have been fitted by using a dipole pomeron model.

The Dipole Pomeron and K+P Elastic Scattering up to 310 GeV/c

Using a dipole pomeron ansatz a good fit to the K+ p total and near-forward elastic differential cross-sections and Re/Im data in the region is obtained for

Dipole pomeron and π-p elastic scattering at high energies

The differential cross-sections for high-energy π-p elastic scattering showing structure near -t = 4 (GeV/c)2 forp L = 50 and 200 GeV/c together with total cross-sections for 50⩽p L⩽ 370 GeV/c, and with -t extending up to 11 (GeV/c)2 have been fitted by using a dipole pomeron model.

Dipole Pomeron and Proton-Proton Elastic Scattering at High Energies

The differential and total cross sections for high energy pp elastic scattering in the energy range 30�8:;;; st :;;; 62 GeV, with -t extending up to 8 (GeV/c)2, have been fitted with a dipole pomeron model.

Two-component structure of the geometrical pomeron

Phenomenological observations at FNAL and CERN-ISR not only confirm the dominance of the short range correlation (SRC) over the long-range correlation (LRC) in multihadronie production (1), but also suggest geometrical scaling (2) and two-component structure (3) of the pomeronic amplitude. Moreover, it has long been recognized that the absorptive mechanism is crucial for the possible stabilization of the pomeron under direct-channel unitarization (~-8). Consequently, it will be of physical importance to investigate the theoretical features of central and peripheral components of the geometrical pomeron within the framework of an absorptive multiperipheral unitarization. By the use of the absorptive procedure of CAN]~SCHI and SCrtwI~R (5), in fact, the first-step unitarization of the dipole pomeron (DPP) has already been studied along this line in a recent paper of two of us (s), which gives a successful description of the SRC component. In this short note, therefore, let us perform the second-step unitarization of the DPP by the self-consistent introduction of the LRC component and examine the possible stability of the two-component structure under absorption. First of all, let us summarize the typical features of the singularity structure of the first-step unitarization of the Dt)P (*). First Crtot(~Y), ~el(:Y) and a~,l(iY ) are described by the colliding-cut pomeron (CCP) of the Finkelstein-Zaeh ariasen type (~), which coalesces into a triple pole at l- 1 for t 0. Secondly az~(:Y) is effectively described by the multiperipheral exchange of the nonlcading colliding-cut pomeron (NLCP), which turns out to be a hard branch cut at 1 1 --gO~2 for t : 0 (**). Thirdly, the NLCP is legitimately approximated by the input DPP near t : 0 so long as go~ln In s/ln s. Finally

The dipole pomeron and pp scattering

A dipole Pomeron model is applied to high energy pp scattering. It is shown that the model reproduces both: the dip structure in the differential cross section and the break in the slope at small ¦t¦. The model indicates the existence of a hard core inside the proton.

Dipole-Pomeron model in proton-proton inclusive and exclusive processes

A model with a simple pole and a double pole for the inclusive Pomeranchuk singularity has been considered. The factorization of this singularity together with the weak-coupling approximation leads to a two-component mechanism for the production processes. Self-consistency of the dipole Pomeron leads to intercept one for this singularity and a meson trajectory is generated in the exclusive process. Phenomenological implications of the model concerning multiplicity distributions and rapidity two-particle exclusive distributions are examined and a comparison with data is made.

Duality, Absorption and the Dipole Pomeron

By the use of the double-impact-parameter representation, a dual crossing-symmetric model of the ·dipole Pomeron with multiple exchange correction is proposed. Theoretical consequences of dual absorption on the Reggeonic amplitude is examined within the .frame· work of the Veneziano duality. In particular, the dual structure and an effective parametri­ zation of the absorbed Lovelace-Veneziano formula are elaborately investigated. It is also_ argued that the so-called dual geometrical amplitude at low momentum transfers originates in both the Veneziano duality and geometrical scaling, and that the Veneziano duality with dual absorptive correction lends active confirmation to the minimal interaction ansatz at high momentum transfers.

Scaling breaking with a dipole pomeron and the growth of proton-proton total cross-section

Using the Mueller formalism, the effect of the conjecture that the coupling of the dipole pomeron is strong only in the double Regge diagrams on the behavior of the inclusive spectrum of pions in the central region, the rising of the inelastic proton-proton cross section at the ISR energies, and the asymptotic behavior of the average multiplicity. For this purpose the Mueller expansion in the central region is used assuming that the leading singularity (pomeron) is a dipole with intercept 1. (JFP)