Measurements of single transverse spin asymmetries for hadron productions in {radical}(s) = 200 GeV p+p collisions at STAR
- Brookhaven National Laboratory, Upton, NY, 11973-5000 (United States)
The question of how the spin degrees of freedom in the nucleon are organized has not yet been fully answered. Forward hadron production in transversely polarized p+p collisions provides a unique way of probing the spin structure of the nucleon. Large (10% or more) single transverse spin asymmetries (A{sub N}) were measured at a wide range of collision energy. The STAR collaboration has previously measured {pi}{sup 0} production with the Forward Pion Detector (FPD) at RHIC, and reported that large A{sub N} persists up to {radical}(s) = 200 GeV. A Pb-glass electromagnetic calorimeter detector named the Forward Meson Spectrometer (FMS) has been built and installed at STAR. The FMS covers the pseudo-rapidity region of 2.5<{eta}<4.2 and the full azimuth. The FMS's large acceptance allows us to extend measurements to higher p{sub T}, to heavier mass regions, and to multi particle final states. STAR has collected data with the FMS during Run 8. Results of A{sub N} measurements using the FMS and FPD will be presented.
- OSTI ID:
- 21325691
- Journal Information:
- AIP Conference Proceedings, Vol. 1182, Issue 1; Conference: 10. conference on the intersections of particle and nuclear physics, San Diego, CA (United States), 26-31 May 2009; Other Information: DOI: 10.1063/1.3293869; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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