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arxiv: nucl-ex/0610022 · v2 · submitted 2006-10-16 · ⚛️ nucl-ex

Double Spin Asymmetries A_NN and A_SS at sqrt{s}=200 GeV in Polarized Proton-Proton Elastic Scattering at RHIC

pp2pp Collaboration: S. Bultmann , I.H. Chiang , R.E. Chrien , A. Drees , R.L. Gill , W. Guryn , J. Landgraf , T.A. Ljubicic
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D. Lynn C. Pearson P. Pile A. Rusek M. Sakitt S. Tepikian K. Yip (1) J. Chwastowski B. Pawlik (2) M. Haguenauer (3) A.A. Bogdanov S.B. Nurushev M.F. Runtzo M.N. Strikhanov (4) I.G. Alekseev V.P. Kanavets L.I. Koroleva B.V. Morozov D.N. Svirida (5) A. Khodinov M. Rijssenbeek L. Whitehead S. Yeung (6) K. De N. Guler J. Li N. Ozturk (7) A. Sandacz (8) ((1) BNL Upton USA (2) INP Cracow Poland (3) Ecole Polytechnique Cedex France (4) MEPhI Moscow Russia (5) ITEP (6) SBU Stony Brook (7) University of Texas at Arlington (8) INS Warsaw Poland)
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classification ⚛️ nucl-ex
keywords asymmetriesdoublepolarizedspinrhicsqrtallowamplitudes
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We present the first measurements of the double spin asymmetries A_NN and A_SS at sqrt{s}=200 GeV, obtained by the pp2pp experiment using polarized proton beams at the Relativistic Heavy Ion Collider (RHIC). The data were collected in the four momentum transfer t range 0.01<|t|<0.03 (GeV/c)^2. The measured asymmetries, which are consistent with zero, allow us to estimate upper limits on the double helicity-flip amplitudes phi_2 and phi_4 at small t as well as on the difference Delta(sigma_T) between the total cross sections for transversely polarized protons with antiparallel or parallel spin orientations.

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