The application of simple dimensional counting to bound states of pointlike particles enables us to derive scaling laws for the asymptotic energy dependence of electromagnetic and hadronic scattering at fixed c.m. angle which only depend on the number of constituent fields of the hadrons. Assuming quark constituents, some of the s→∞, fixed-t/s predictions are (dσ/dt)πp→πp∼s^-8, (dσ/dt)pp→pp∼s^-10, (dσ/dt)γp→πp∼s^-7, (dσ/dt)γp→γp∼s^-6, Fπ(q^2)∼(q2)^-1, and F1p(q^2)∼(q^2)^-2. We show that such scaling laws are characteristic of renormalizable field theories satisfying certain conditions.

/pdf/scaling-laws-at-large-transverse-momentum-19r7itcel3.pdf

Scaling laws at large transverse momentum

Nuclear charge and magnetization density distribution parameters from elastic electron scattering

Few-nucleon physics is a field rich with high-quality experimental data and possibilities for accurate calculations of strongly correlated quantum systems. In this article the authors discuss the traditional model of the nucleus as a system of interacting nucleons and outline many recent experimental results and theoretical developments in the field of few-nucleon physics. The authors describe nuclear structure and spectra, clustering and correlations, elastic and inelastic electromagnetic form factors, low-energy electroweak reactions, and nuclear scattering and response in the quasielastic regime. Through a review of the rich body of experimental data and a variety of theoretical developments, a coherent description of the nuclear strong- and electroweak-interaction properties emerges. In this article, the authors attempt to provide some insight into the practice and possibilities in few-nucleon physics today.

/pdf/structure-and-dynamics-of-few-nucleon-systems-4en9jr6tdb.pdf

Structure and dynamics of few-nucleon systems

The third-order QCD corrections to deep-inelastic scattering by photon exchange

Dispersion-theoretical analysis of the nucleon electromagnetic form factors

We report preliminary values of electron-proton elastic scattering measurements at the Stanford Linear Accelerator Center (SLAC) carried out at squared four-momentum transfers q^2 from 0.7 to 25.0 (GeV/c)^2. In the newly accessible region of q^2 above 10 (GeV/c)^2, the principal feature is the continued decrease of the magnetic form factor approximately as 1/q^4.

/pdf/electron-proton-elastic-scattering-at-high-momentum-unnvvt8w6x.pdf

Electron--proton elastic scattering at high momentum transfers.

Electron-proton elastic-scattering cross sections have been measured at the Stanford Linear Accelerator Center for four-momentum transfers squared q^2 from 1.0 to 25.0 (GeV/c)^2. The electric (GEp) and magnetic (GMp) form factors of the proton were not separated, since angular distributions were not measured at each q^2. However, values for GMp were derived assuming various relations between GEp and GMp. Several theoretical models for the behavior of the proton magnetic form factor at high values of q^2 are compared with the data.

/pdf/elastic-electron-proton-scattering-at-large-four-momentum-3t7jqh710q.pdf

Elastic electron - Proton Scattering at Large Four Momentum Transfer

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Electron--proton elastic scattering at high momentum transfers.

Elastic electron - Proton Scattering at Large Four Momentum Transfer