Double spin asymmetries ANN and ASS at s=200GeV in polarized proton–proton elastic scattering at RHIC
/ Authors
pp2pp Collaboration S. Bultmann, I. Chiang, R. Chrien, A. Drees, R. Gill, W. Guryn, J. Landgraf, T. Ljubičić, D. Lynn, C. Pearson
and 43 more authors
P. Pile, A. Rusek, M. Sakitt, S. Tepikian, K. Yip, J. Chwastowski, B. Pawlik, M. Haguenauer, A. Bogdanov, S. Nurushev, M. F. Runtzo, M. Strikhanov, I. Alekseev, V. Kanavets, L. Koroleva, B. Morozov, D. Svirida, A. Khodinov, M. Rijssenbeek, L. Whitehead, S. Yeung, K. De, N. Guler, J. Li, N. Ozturk, A. S. Bnl, Upton, Usa, Inp, Cracow, Poland, E. Polytechnique, Cedex, France., Mephi, Moscow, Russia., Itep, Sbu, S. Brook, University of Texas at Arlington, Ins, Warsaw
/ Abstract
Abstract We present the first measurements of the double spin asymmetries A N N and A S S at 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 ϕ 2 and ϕ 4 at small | t | as well as on the difference Δ σ T between the total cross sections for transversely polarized protons with antiparallel or parallel spin orientations.
Journal: Physics Letters B