High-precision measurement of the analyzing power in large- P sub perpendicular sup 2 spin-polarized 24-GeV/ c proton-proton elastic scattering

Journal Article · Mon Dec 24 00:00:00 EST 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.65.3241· OSTI ID:5834769

Crabb, D G; Kaufman, W A; Krisch, A D; Lin, A M.T.; Peaslee, D C; Phelps, R A; Raymond, R S; Roser, T; Stewart, J A; Van Guilder, B S; Vuaridel, B; Wong, V K ^[1]; Brown, K A; Ratner, L G ^[2]; Glass, G ^[3]; Miller, C A; Vetterli, M ^[4]; Khiari, F Z ^[5]

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1. Randall Laboratory of Phyics, The University of Michigan, Ann Arbor, MI (USA)
2. Alternating Gradient Synchrotron Department, Brookhaven National Laboratory, Upton, NY (USA)
3. Department of Physics, Texas A M University, College Station, TX (USA)
4. TRIUMF, Vancouver, British Columbia (Canada)
5. King Fahd University, Dhahran 31261 (Saudi Arabia)

We measured the analyzing power {ital A} out to {ital P}{sub {perpendicular}}{sup 2}=7.1 (GeV/c){sup 2} with high precision by scattering a 24-GeV/{ital c} unpolarized proton beam from the new University of Michigan polarized proton target; the target's 1-W cooling power allowed a beam intensity of more than 2{times}10{sup 11} protons per pulse. This high beam intensity together with the unexpectedly high average target polarization of about 85% allowed unusually accurate measurements of {ital A} at large {ital P}{sub {perpendicular}}{sup 2}. These precise data confirmed that the one-spin parameter {ital A} is nonzero and indeed quite large at high {ital P}{sub {perpendicular}}{sup 2}; most theoretical models predict that {ital A} should go to zero.

• OSTI ID: 5834769
• Journal Information: Physical Review Letters; (USA), Vol. 65:26; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
HADRON-HADRON INTERACTIONS
ANALYZING POWER
PROTON-PROTON INTERACTIONS
ELASTIC SCATTERING
BNL
EXPERIMENTAL DATA
GEV RANGE 10-100
TRANSVERSE MOMENTUM
BARYON-BARYON INTERACTIONS
DATA
ENERGY RANGE
GEV RANGE
INFORMATION
INTERACTIONS
LINEAR MOMENTUM
NATIONAL ORGANIZATIONS
NUCLEON-NUCLEON INTERACTIONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PROTON-NUCLEON INTERACTIONS
SCATTERING
US AEC
US DOE
US ERDA
US ORGANIZATIONS
645103* - High Energy Physics- Particle Interactions & Properties-Experimental- Strong Interactions & Baryon & Meson Properties