Double Spin Asymmetries ANN and ASS at sqrts=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, D. Lynn, C. Pearson, P. Pile, A. Rusek, M. Sakitt, S. Tepikian, K. Yip, J. Chwastowski, B. Pawlik, M. Haguenauer, A. A. Bogdanov, S. B. Nurushev, M. F. Runtzo, M. N. Strikhanov, I. G. Alekseev, V. P. Kanavets, L. I. Koroleva, B. V. Morozov, D. N. Svirida, A. Khodinov, M. Rijssenbeek, L. Whitehead, S. Yeung, K. De, N. Guler, J. Li, N. Ozturk, A. Sandacz
Abstract
We present the first measurements of the double spin asymmetries ANN and ASS at sqrts=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 phi2 and phi4 at small t as well as on the difference Delta(sigmaT) between the total cross sections for transversely polarized protons with antiparallel or parallel spin orientations.
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