V. V. Ezhela

Benchmarks for the forward observables at RHIC, the Tevatron-run II, and the LHC

We present predictions on the total cross sections and on the rho parameter for present and future pp and (-)pp colliders, and on total cross sections for gammap-->hadrons at cosmic-ray energies and for gammagamma-->hadrons up to sqrt[s]=1 TeV. These predictions are based on an extensive study of possible analytic parametrizations invoking the largest hadronic dataset available at t=0. The uncertainties on total cross sections reach 1.9% at the Relativistic Heavy Ion Collider, 3.1% at the Tevatron, and 4.8% at the Large Hadron Collider, whereas those on the rho parameter are, respectively, 5.4%, 5.2%, and 5.4%.

Hadronic scattering amplitudes: Medium-energy constraints on asymptotic behavior

We consider several classes of analytic parametrisations of hadronic scattering amplitudes, and compare their predictions to all available forward data (p p, pbar p, pi p, K p, gamma p, gamma gamma, Sigma p). Although these parametrisations are very close for sqrt(s) > 9 GeV, it turns out that they differ markedly at low energy, where a universal pomeron term ~log^2(s) enables one to extend the fit down to sqrt(s)=4 GeV.

New measures of the quality and of the reliability of fits applied to forward hadronic data at t = 0

We develop five new statistical measures of the quality of fits, which we combine with the usual confidence level to determine the models which fit best all available data for total cross sections and for the real part of the forward hadronic amplitude.

Forward Observables at RHIC, the Tevatron Run II and the LHC

We present predictions on the total cross sections and on the ratio of the real part to the imaginary part of the elastic amplitude (ρ parameter) for present and future pp and p \( \bar p \) colliders, and on total cross sections for γp → hadrons at cosmic-ray energies and for γγ → hadrons up to √s = 1 TeV. These predictions are based on a study of many possible analytic parametrisations and invoke the current hadronic dataset at t = 0. The uncertainties on total cross sections, including the systematic theoret ical errors, reach 1% at RHIC, 3% at the Tevatron, and 10% at the LHC, whereas those on the ρ parameter are respectively 10%, 17%, and 26%.

Analytic amplitudes for hadronic forward scattering: COMPETE update

We consider several classes of analytic parametrizations of hadronic scattering amplitudes, and compare their predictions to all available forward data ( pp , p ¯ p , πp , Kp , γp , γγ, Σ p ). Although these parametrizations are very close for s ≥ 9 GeV, it turns out that they differ markedly at low energy, where a universal Pomeron term ∼ ln 2 s enables one to extend the fit down to s =4 GeV. We present predictions on the total cross sections and on the ratio of the real part to the imaginary part of the elastic amplitude (ρ parameter) for present and future pp and p ¯ p colliders, and on total cross sections for γ P → hadrons at cosmic-ray energies and for γγ → hadrons up to s =1 TeV.

Total cross sections for hadron collisions on the basis of the HPR1R2 model

The results of a quantitative, statistically complete, description of the total-cross-section data obtained worldwide for hadron–hadron (photon–hadron) collisions and compiled in the Particle Data Group surveys are presented for several versions of a universal analytic parametrization of amplitudes for forward hadron–hadron (photon-hadron) scattering.

DaMoScope and its internet graphics for the visual control of adjusting mathematical models describing experimental data

The experience of using the dynamic atlas of the experimental data and mathematical models of their description in the problems of adjusting parametric models of observable values depending on kinematic variables is presented. The functional possibilities of an image of a large number of experimental data and the models describing them are shown by examples of data and models of observable values determined by the amplitudes of elastic scattering of hadrons. The Internet implementation of an interactive tool DaMoScope and its interface with the experimental data and codes of adjusted parametric models with the parameters of the best description of data are schematically shown. The DaMoScope codes are freely available.

Overview of the Compete Program

Nowadays, scientific databases have become the bread-and-butter of particle physicists. They are used not only for citation and publication [1, 2, 3, 4], but also for access to data compilations [5, 6, 7] and for the determination of the best parameters of currently accepted models [5, 6, 8]. These databases provide inestimable tools as they organize our knowledge in a coherent and trustworthy picture. They have lead not only to published works such as the Review of Particle Physics [9], but also to web interfaces, and reference data compilations available in a computerized format readily usable by physicists. It should be pointed out at this point that one is far from using the full power of the web, as cross-linking between various databases and interactive interfaces are only sketchy. Part of the problem comes from the absence of a common repository or environment.