Measurements of single and double spin asymmetry in pp elastic scattering in the CNI region with a polarized atomic hydrogen gas jet target

Journal Article · Fri May 01 00:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.094014· OSTI ID:21308418

Alekseev, I G; Svirida, D N ^[1]; Bravar, A; Gill, R; Huang, H; Kponou, A; Makdisi, Y; Nass, A; Wood, J; Zelenski, A ^[2]; Bunce, G ^[2]; Dhawan, S ^[3]; Eyser, K O ^[4]; Haeberli, W; Wise, T ^[5]; Jinnouchi, O ^[6]; Nakagawa, I ^[7]; Okada, H; Saito, N ^[8]; Stephenson, E J ^[9]

---

1. Institute for Theoretical and Experimental Physics (ITEP), 117259 Moscow (Russian Federation)
2. Brookhaven National Laboratory, Upton, New York 11973 (United States)
3. Yale University, New Haven, Connecticut 06520 (United States)
4. University of California, Riverside, California 92521 (United States)
5. University of Wisconsin, Madison, Wisconsin 53706 (United States)
6. RIKEN BNL Research Center, Upton, New York 11973 (United States)
7. RIKEN, Wako (Japan)
8. Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan, and RIKEN, Wako, Saitama 351-0198 (Japan)
9. Indiana University Cyclotron Facility, Bloomington, Indiana 47408 (United States)

Precise measurements of the single spin asymmetry A{sub N}, and the double spin asymmetry A{sub NN}, in proton-proton (pp) elastic scattering in the region of four-momentum transfer squared 0.001<-t<0.032 (GeV/c){sup 2} have been performed using a polarized atomic hydrogen gas jet target and the Relativistic Heavy Ion Collider (RHIC) polarized proton beam. We present measurements of A{sub N} and A{sub NN} at center-of-mass energies {radical}(s)=6.8 and 13.7 GeV. These spin-dependent observables are sensitive to the poorly known hadronic spin-dependent amplitudes. Comparing A{sub N} at different energies, a {radical}(s) dependence of the hadronic single spin-flip amplitude is suggested. A hadronic double spin-flip amplitude from the A{sub NN} data is consistent with zero within a 2-{sigma} level. We also present {delta}{sigma}{sub T}, estimated from the measured A{sub NN} data. The results for {delta}{sigma}{sub T} are consistent with zero. Our results provide significant constraints toward a comprehensive understanding of the reaction mechanism for pp elastic scattering.

• OSTI ID: 21308418
• Journal Information: Physical Review. D, Particles Fields, Vol. 79, Issue 9; Other Information: DOI: 10.1103/PhysRevD.79.094014; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ASYMMETRY
BROOKHAVEN RHIC
CENTER-OF-MASS SYSTEM
ELASTIC SCATTERING
FOUR MOMENTUM TRANSFER
GEV RANGE 10-100
HYDROGEN
PROTON BEAMS
PROTON-PROTON INTERACTIONS
PROTONS
REACTION KINETICS
SPIN
SPIN FLIP