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One of the most fundamental problems in elementary particle physics is the study of the interaction of the pion meson with nucleons. It is believed that the pion meson plays a fundamental role in the description of nuclear forces and it is important, therefore, to understand the interaction of these particles. The primary method of gaining information on this interaction is through scattering experiments, and this book is concerned primarily with studies of pion-nucleon scattering at high energies. Originally published in 1969. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.
About three decades after the first experiments on deep inelastic lepton hadron scattering began to investigate the structure of hadrons, the history of this fruitful field of particle physics continues in the broad spectrum of research performed at the electron and positron proton collider HERA at DESY, where the multipurpose detectors ZEUS and H1 access ep scattering at a center of mass energy of 300 GeV and explore as yet uncharted kinematic realms of deep inelastic scattering. After the first years of data taking at HERA, each of the experiments has collected a total of roughly 40 pb 1 of e+p data, yielding sensitivity to deep inelastic e+p interactions at high four momentum transfers, Q2, where typi cal cross sections drop into the subpicobarn regime. This kinematic domain is characterized by electroweak unification, manifesting itself most markedly in the neutral and charged current cross sections, which approach an equal order of magnitude as Q2 rises above the square of the W and Z masses. Consequently, HERA allows, for the first time, studies of both types of pro cesses simultaneously with the same initial state conditions and in the same detector, and thus we can investigate the interplay of electroweak and strong forces governing the respective cross sections.
Differential cross sections for elastic pi -p scattering were measured at eight energies for positive pions and seven energies for negative pions. Energies ranged from 310to 650 Mev. Fifty-one scintillation counters and a matrix-coincidence system were used to measure simultaneously elastic events at 21 angles and charged inelastic events at 78 pi -p angle pairs. Events were detected by a coincidence of pulses indicating the presence of an incident pion, scattered pion, and recoil proton and the results were stored in the memory of a pulse-height analyzer. Various corrections were applied to the dnta and a leastsquares fit was made to the results at each energy. The form of the fitting function was a power series in the cosine of the center-of-mass angle of the scattered pion. Integrntion under the fitted curves gave values for the total elastic cross section. The importance of certain angularmomentum states, particularly the D/sub 13/ state near 600 Mev, is discussed. Several possible explanations are given of the enhancement in the pi /sup -/-p cross sections near 600 Mev. (auth).
Revised experimental values are given for the differential cross section for proton-proton scattering at energies of 1.397, 1.855, 2.425, and 3.037 MeV. These result from the consolidation and re-evaluation of all published and unpublished data obtained in an experiment reported earlier by Knecht, et al. Phase shift analyses have been made.