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24 April 2024

» arxiv » hep-ex/0601001

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Measurement of the Analyzing Power $A_N$ in $pp$ Elastic Scattering in the CNI Region with a Polarized Atomic Hydrogen Gas Jet Target
H. Okada ; I.G. Alekseev ; A. Bravar ; G. Bunce ; S. Dhawan ; R. Gill ; W. Haeberli ; O. Jinnouchi ; A. Khodinov ; Y. Makdisi ; A. Nass ; N. Saito ; E.J. Stephenson ; D.N. Svirida ; T. Wise ; A. Zelenski ;
Date:	31 Dec 2005
Abstract:	A precise measurement of the analyzing power $A_N$ in proton-proton elastic scattering in the region of 4-momentum transfer squared $0.001 < t < 0.032 ({ m GeV}/c)^2$ has been performed using a polarized atomic hydrogen gas jet target and the 100 GeV/$c$ RHIC proton beam. The interference of the electromagnetic spin-flip amplitude with a hadronic spin-nonflip amplitude is predicted to generate a significant $A_N$ of 4--5%, peaking at $-t simeq 0.003 ({ m GeV}/c)^2$. This kinematic region is known as the Coulomb Nuclear Interference region. A possible hadronic spin-flip amplitude modifies this otherwise calculable prediction. Our data are well described by the CNI prediction with the electromagnetic spin-flip alone and do not support the presence of a large hadronic spin-flip amplitude.
Source:	arXiv, hep-ex/0601001
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