Elliot Leader

THE THEORY AND PHENOMENOLOGY OF POLARIZED DEEP INELASTIC SCATTERING

Comprehensive review paper on the theory and phenomenology of polarized deep inelastic scattering, to appear in Physics Reports

High energy spin physics

The confrontation between theory and experiment in high energy spin physics is already tantalizing. Future experiments will provide a severe test for QCD.

Similarities and differences between pp and pp scattering at TeV energies and beyond

Abstract The significant difference between the pp and p p elastic dσ/dt discovered at the CERN ISR, and the behaviour of the p p dσ/dt at the CERN collider, which have profound implications for the asymptotic behaviour of hadron scattering amplitudes, are explained in terms of a model theory based upon general S-matrix principles and a dynamical assumption of “maximal strength” for the strong interactions. Our model theory provides an excellent description of the pp and p p data in the huge range 10 ⩽ √s ⩽ 630 GeV for |t| ⩽ 2.5 (GeV)2. Several striking consequences of the theory will be testable at Tevatron energies and beyond.

The spin dependence of high energy proton scattering.

Motivated by the need for an absolute polarimeter to determine the beam polarization for the forthcoming BNL RHIC spin program, we study the spin dependence of the proton-proton elastic scattering amplitudes at high energy and small momentum transfer. In particular, we examine experimental evidence for the existence of an asymptotic part of the helicity-flip amplitude

Exact sum rule for transversely polarized DIS

{\ensuremath{\varphi}}_{5}

A new study of the polarized parton densities in the nucleon

which is not negligible relative to the largely imaginary average nonflip amplitude

Odderon description of the pp and p̄p forward and non-forward data

{\ensuremath{\varphi}}_{+}=\frac{1}{2}({\ensuremath{\varphi}}_{1}+{\ensuremath{\varphi}}_{3}).

SCHEME DEPENDENCE IN POLARIZED DEEP INELASTIC SCATTERING

We discuss theoretical estimates of

A crisis in the parton model: Where, oh where is the proton’s spin?

{r}_{5}=m{\ensuremath{\varphi}}_{5}/\sqrt{\ensuremath{-}t}\mathrm{Im}{\ensuremath{\varphi}}_{+}

On the Sensitivity of the Polarized Parton Densities to Flavour SU(3) Symmetry Breaking

based upon several approaches: extrapolation of low and medium energy Regge phenomenological results to high energies, models based on a hybrid of perturbative QCD and nonrelativistic quark models, and models based on eikonalization techniques. We also apply the rigorous, model-independent methods of analyticity and unitarity. We find the preponderence of evidence at currently available energy indicates that