Abstract
In 2011 the PAX Collaboration has performed a successful spin-filtering test using protons at T p = 49.3 MeV at the COSY ring, which confirms that spin filtering is a viable method to polarize a stored beam and that the present interpretation of the mechanism in terms of the proton-proton interaction is correct. The equipment and the procedures to produce stored polarized beams was successfully commissioned and are established. The outcome of the experiment is of utmost importance in view of the possible application of the method to polarize a beam of stored antiprotons.
Highlights
Polarized antiprotons allow unique access to a number of fundamental physics observables
The beam polarization obtained from spin-filtering cycles of different length for the two target spinorientations is presented in Fig. 4
In order to investigate fake asymmetries as possible sources of systematic errors, the same analysis procedure has been applied to the zero measurement, where no spin-filtering took place and no polarization was induced in the beam
Summary
Polarized antiprotons allow unique access to a number of fundamental physics observables. One example is the transversity distribution which would be directly measurable via Drell-Yan production in double polarized antiproton-proton collisions (Fig. 1). This and other observables, which are accessible via ppscattering experiments [1], led the Polarized Antiproton eXperiments (PAX) collaboration to propose such investigations at the High Energy Storage Ring (HESR) of the Facility for Antiproton and Ion Research (FAIR)[1]. After the first experimental evidence with a 23 MeV proton beam at the TSR ring in Heidelberg [3], an additional measurement, has been recently performed at the COSY storage ring to provide an independent confirmation of the method and of its present theoretical interpretation [4,5,6]
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