Measurement of the asymmetry in calorimeter triggered high-p⟂ events using a polarized proton beam and target
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
- Argonne National Lab. (ANL), Argonne, IL (United States); et al.
We propose an experiment to measure asymmetries of events at high p⟂ with opposite initial spin states. We will measure the single-spin asymmetry, AN, where the beam is polarized in the transverse plane, and the double-spin asymmetry, ALL, where both beam and target have longitudinal helicity. These asymmetry measurements will be done for single hadrons at high p⟂ and also for jet-like events or clusters of particles at high p⟂. An existing calorimeter will be used to select jet events and also to simultaneously trigger on charged single hadrons. The use of a large aperture, magnetic spectrometer in the polarized beam line will aid in the reconstruction of the jet-like events to obtain a p⟂ resolution of ± 0.35 GeV/c. A measurement of the asymmetries to ± 3% can be made at 400 GeV/c for jets at about p⟂ = 6 GeV/c and for single hadrons at about p⟂ = 4.5 GeV/c. This experiment will attempt to shed more light on the current understanding of the basic hard scattering models as well as open the door to possible new horizons in polarization phenomena. The polarized beam at Fermilab provides an excellent opportunity to investigate spin effects as a natural and essential step for our further understanding of the constituent behavior. We will run both with a liquid hydrogen target during the polarization measurements and later with a longitudinally polarized target. Proton induced reactions will be studied at 400 GeV/c and antiproton induced reactions at 200 GeV/c, where the $$\overline{p}$$ flux is highest.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1847402
- Report Number(s):
- FERMILAB-PROPOSAL-0689; oai:inspirehep.net:175593
- Country of Publication:
- United States
- Language:
- English
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