Eur. Phys. J. C (2005) 43: 329-332
https://doi.org/10.1140/epjc/s2005-02213-2

Experimental Physics

Hard scattering and jets: from pp collisions in the 1970’s to Au + Au collisions at RHIC

Physics Department, 510c Brookhaven National Laboratory, NY 11973-5000, Upton, USA

^* e-mail: mjt@bnl.gov

Received: 6 January 2005
Published online: 15 June 2005

Abstract

Hard scattering in pp collisions, discovered at the CERN ISR in 1972 by the method of leading particles, proved that the partons of Deeply Inelastic Scattering strongly interacted with each other. Further ISR measurements utilizing inclusive single or pairs of hadrons established that high particles are produced from states with two roughly back-to-back jets which are the result of scattering of constituents of the nucleons as described by Quantum Chromodynamics (QCD), which was developed during the course of these measurements. These techniques, which are the only practical method to study hard-scattering and jet phenomena in Au + Au central collisions at RHIC energies, are reviewed, with application to present RHIC measurements.