RIKEN BNL RESEARCH CENTER WORKSHOP ON HIGH ENERGY POLARIMETRY, VOLUME 23 [electronic resource].
- Upton, N.Y. : Brookhaven National Laboratory ; Oak Ridge, Tenn. : distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2000
- Physical description
- 1 online resource (158 pages ) : digital, PDF file.
- Brookhaven National Laboratory Researcher
- United States. Dept. of Energy. Office of Scientific and Technical Information. Distributor
- LEADER, E. Author
- The RHIC collider, in its pp mode, will be a unique machine. It will open up a new frontier in the use of spin in the study of hadronic physics. Using its polarized beams, a whole new range of tests of the Standard Model will become feasible, and much new information about the detailed partonic structure of-the nucleon will emerge. It will also be possible to answer intriguing questions concerning the relationship between pp and pp total cross-sections and real parts of forward amplitudes, questions which are relevant to attempts to understand certain aspects of non-perturbative QCD. This entire, rich program relies upon an accurate determination of the polarization of the proton beams, a matter which is far from trivial. In the summer of 1997 Larry Trueman and the author ran a six-week Working Group, the aim of which was to try to understand theoretically the accuracy with which one could predict the analyzing power of various reactions which were under consideration as high energy proton polarimeters. The results of the study were somewhat negative in the sense that they concluded that analyzing powers could only be predicted to within an accuracy of ±10%, whereas RHIC was aiming for ±5%. On the other hand some very positive consequences followed. The working group stimulated the study of a polarimeter based on CNI in proton-carbon scattering and this is the polarimeter that will be used in the early stages of RHIC operation. It will be regarded as a relative polarimeter and will have to be calibrated absolutely at some later stage, probably via use of a polarized jet hydrogen target. In addition the surprising discovery was made that proton-proton elastic scattering, at high energy and very small momentum transfer, is self-spin analyzing, in the sense that the measurement of a sufficient number of spin-dependent observables will yield not only the values of the helicity amplitudes, but also the value of the beam and target polarizations.
- Publication date
- Published through SciTech Connect.
- " kb0201"
- RIKEN BNL RESEARCH CENTER WORKSHOP ON HIGH ENERGY POLARIMETRY, Upton, NY (US), 08/18/1999.
- LEADER, E.
- FORMAL REPORT; 08/18/1999 - 08/18/1999
- Funding Information