The use of transition radiation (TR) as a means of identifying high energy particles has now become a subject of intensive experimental investigations and applications. Our intention is first to study the physics of these phenomena and to describe ways of building detectors which can efficiently identify particles.

Transition radiation detectors

Prompt photon production at large pt in qcd beyond the leading order

Direct photons from relativistic heavy-ion collisions

The Drell-Yan process is an electromagnetic effect in which a quark and antiquark from a pair of interacting hadrons annihilate to give a lepton pair. A brief description of hadron structure and the parton model is given to provide a necessary background. Then the general features of lepton pair production are described and the Drell-Yan formalism is set up. Experimental techniques are described next; these are rather simple since it is only necessary to detect the leptons emitted from hadron interactions. Predictions and tests of the basic model show that, in general, it works well. The anomalous features are the overall cross-section level (high by a factor of 2) and the unexpectedly large mean transverse momenta. Quantum chromodynamics (QCD) offers the explanation of these anomalies, and measurements of dilepton production provide important quantitative tests of QCD. Such measurements have also been used to determine nucleon structure functions and, for the first time, meson structure functions.

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The Drell-Yan process

On the physics potential to study the gluon content of proton and deuteron at NICA SPD

Transition radiators for electron identification at the CERN ISR

Direct photon and neutral-pion production have been measured inpp collisions at the CERN ISR for 30<
 
$$\sqrt s $$

 <63 GeV and transverse momenta up to 12 GeV/c. The direct photon signal relative to neutral-pion production increases withp

 T
 and shows little
 
$$\sqrt s $$

 -dependence. Results are reported from a variety of running conditions, and details are given on the method of analysis and on the evaluation of systematic errors for the inclusive cross-section of single-photon and neutral-pion production.

R. B. Palmer

Papers

Transition radiators for electron identification at the CERN ISR

High-p T direct photon production inpp collisions