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3 results on '"Antonio Villari"'

1. Physics with a High Energy Polarized Proton Beam at Fermilab

Author

I. P. Auer, A. Michalowicz, G. S. Mutchler, G. Shapiro, Jay Roberts, D. G. Underwood, G.C. Phillips, A. Yokosawa, R. G. Wagner, D. Hill, Ryusaburo Kikuchi, K. Kuroda, Kozo Miyake, K. Toshioka, A. Penzo, Yasuo Hemmi, H.E. Miettinen, D. Perret-Gallix, H. M. Spinka, R. Birsa, P. Schiavon, R. Ditzler, G. Theodosiou, M. Giorgi, Antonio Villari, E. Colton, F. Bradamante, T. A. Mulera, N. Tamura, and T. Nakamura

Subjects
Physics, Particle physics, Proton, Meson, Scattering, Nuclear Theory, Hadron, Antiproton, Physics::Accelerator Physics, High Energy Physics::Experiment, Fermilab, Nuclear Experiment, Beam (structure), Spin-½
Abstract

The properties of a proton (antiproton) polarized beam obtained from lambda (antilambda) particles decay, planned for the Meson Area at Permilab, are reviewed and related experiments directed towards studying the spin composition of hadrons and spin effects in constituents scattering are discussed.

Published
1981

2. A Scintillation Target for Calibration of High Energy Polarized Proton Beams

Author

P. Schiavon, D. Perret-Gallix, Marcello Giorgi, Aldo Penzo, P. Moras, S. Dalla Torre, K. Kuroda, M. Di Drusco, A. Michalowicz, Franco Bradamante, R. Birsa, H. Azaĭez, and Antonio Villari

Subjects
Nuclear physics, Elastic scattering, Physics, Scintillation, Recoil, Large Hadron Collider, Proton, Physics::Instrumentation and Detectors, Physics::Accelerator Physics, Scintillator, Nuclear Experiment, Polarization (waves), Beam (structure)
Abstract

Measurement of polarization in pp elastic scattering in the Coulomb interference region is considered as a valid method for calibrating high energy polarized proton beams. Possibility of using a scintillation target to detect low energy recoil protons in this |t| region has been studied by using a 4 GeV/c π- beam from CERN PS. The results obtained with a stack of thin plastic scintillators, each 1 mm thick, showed the feasibility of detecting recoil protons in a |t| range as low as ~5×10-3 (GeV/c)2.

Published
1981

3. Measurement of Spin Effects at 150 and 200 GeV/c for pp and π+p Elastic Scattering

Author

A. Penzo, L. Lanceri, Franco Bradamante, A. Vascotto, G. Leder, Anna Teresa Meneguzzo, Antonio Villari, P. Schiavon, Ch. Gottfried, R. Frühwirth, M. Steuer, H. Stradner, F. Gasparini, M. Pernicka, G. Fidecaro, S. Nurushev, R. Birsa, W. Bartl, C. Voci, L. Piemontese, G. Neuhofer, Marcello Giorgi, P. Sartori, M. Posocco, M. Fidecaro, M. Regler, Ch. Poyer, V. Solovianov, and W. Majerotto

Subjects
Diffraction, Elastic scattering, Physics, Pion, Momentum transfer, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Polarization (waves)
Abstract

The elastic scattering of protons and pions on polarized protons has been measured at 150 and 200 GeV/c, in a momentum transfer region still dominated by diffraction. The pp cross-section (spin-averaged) develops a dip at |t| ≅ 1.5 GeV2 which becomes more important as the energy increases. The (negative) polarization, which steadily increases from zero at t = -0.4 GeV2, reaches 10–15%; in the dip region a zero-crossing to positive values seems to take place. The π+p polarization has a similar t-dependence, while the cross-section shows no dip structure.

Published
1981

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