arXiv subjects

M. M. Block

Publications and source records attributed to M. M. Block.

24 records · Page 2Linked to original sources

arXiv2000

Breaking the Barriers - Uniting Accelerator and Cosmic Ray p-p Cross Sections

We make a QCD-inspired parameterization of all accelerator data on forward proton-proton and antiproton-proton scattering amplitudes. Using vector dominance and the additive quark model, we show that the same parameters also fit gamma p and gamma gamma interactions. Using the high energy predictions of our model, along with Glauber theory, we calculate proton-air cross sections at energies near sqrt s approx 30 TeV. The comparisons of p-air cosmic ray measurements with our QCD model predictions provide a strong constraint on the inclusive particle production cross section.

hep-ph↗

arXiv1999

Predicting Proton-Air Cross Sections at sqrt s ~30 TeV, using Accelerator and Cosmic Ray Data

We use the high energy predictions of a QCD-inspired parameterization of all accelerator data on forward proton-proton and antiproton-proton scattering amplitudes, along with Glauber theory, to predict proton-air cross sections at energies near \sqrt s \approx 30 TeV. The parameterization of the proton-proton cross section incorporates analyticity and unitarity, and demands that the asymptotic proton is a black disk of soft partons. By comparing with the p-air cosmic ray measurements, our analysis results in a constraint on the inclusive particle production cross section.

hep-ph↗

arXiv1998

Photon-Proton and Photon-Photon Scattering from Nucleon-Nucleon Forward Amplitudes

We show that the data on $γp$ and $γγ$ interactions can be derived from the $pp$ and $\bar p p$ forward scattering amplitudes using vector meson dominance and the additive quark model. The nucleon-nucleon data are parameterized using a model where high energy cross sections rise with energy as a consequence of the increasing numbers of soft partons populating the colliding particles. We present detailed descriptions of the data on the total and elastic cross sections, the ratio of the real to imaginary part of the forward scattering amplitude, and on the slope of the differential cross sections for $pp$, $\bar p p$, $γp$, $γγ$, $γp \to γV$ and $γγ\to V_i V_j$ reactions, where $V= ρ, ω, ϕ$. We make a wide range of predictions for future HERA and LHC experiments and for $γγ$ measurements at LEP.

hep-ph↗

arXiv1997

On the LEP Measurements of the Rising Photon-Photon Total Cross Section

Using vector meson dominance we calculate the $γγ$ total cross section from data on $pp$, $p\bar p$ and $γp$ total cross sections. Our result agrees with recent high energy measurements performed by the L3 experiment at the LEP collider, not with the conflicting preliminary data obtained by OPAL.

hep-ph↗

arXiv1995

The High Energy Behavior of the Forward Scattering Parameters---An Amplitude Analysis Update

Utilizing the most recent experimental data, we reanalyze high energy \pbar p and pp data, using the asymptotic amplitude analysis, under the assumption that we have reached `asymptopia'. This analysis gives strong evidence for a $\log \,(s/s_0)$ dependence at {\em current} energies and {\em not} $\log^2 (s/s_0)$, and also demonstrates that odderons are {\em not} necessary to explain the experimental data.

hep-ph↗

arXiv1994

The High Energy Behavior of the Forward Scattering Parameters σtotal $ρ$, and $B$

Utilizing the most recent experimental data, we reanalyze high energy \pbar p and pp data, using two distinct (and {\em dissimilar}) analysis techniques: (1) asymptotic amplitude analysis, under the assumption that we have reached `asymptopia', and (2) an eikonal model whose amplitudes are designed to mimic real QCD amplitudes. The former gives strong evidence for a $\log \,(s/s_0)$ dependence at {\em current} energies and {\em not} $\log^2 (s/s_0)$, and demonstrates that odderons are {\em not} necessary to explain the experimental data. The latter gives a unitary model for extrapolation into true `asymptopia' from current energies, allowing us to predict the values of the total cross section at future supercolliders. Using our QCD-model, we obtain $\stot(16\,\, {\rm TeV})=109\pm4$\,mb and $\stot(40\,\, {\rm TeV})=124\pm4$\,mb.

hep-ph↗