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Measurement of the Spin-Dependence of the pbar-p Interaction at the AD-Ring

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arxiv 0904.2325 v1 pith:RU2QS5TA submitted 2009-04-15 nucl-ex

Measurement of the Spin-Dependence of the pbar-p Interaction at the AD-Ring

C. Barschel , U. Bechstedt , J. Dietrich , N. Dolfus , R. Engels , R. Gebel , H. Hadamek , J. Haidenbauer
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C. Hanhart A. Kacharava G. Krol M. Kueven G. Langenberg A. Lehrach B. Lorentz R. Maier S. Martin U.-G. Meissner M. Nekipelov N.N. Nikolaev D. Oellers G. d'Orsaneo D. Prasuhn F. Rathmann M. Retzlaff J. Sarkadi R. Schleichert H. Seyfarth A. Sibirtsev D. Spoelgen H.J. Stein H. Stockhorst H. Stroeher Chr. Weidemann D. Welsch P. Wieder L. Barion S. Bertelli V. Carassiti G. Ciullo M. Contalbrigo A. Cotta-Ramusino P.F. Dalpiaz A. Drago G. Guidoboni P. Lenisa L. Pappalardo G. Stancari M. Stancari M. Statera T. Azarian A. Kulikov V. Kurbatov G. Macharashvili S. Merzliakov I.N. Meshkov A. Smirnov D. Tsirkov Yu. Uzikov S. Barsov S. Belostotski K. Grigoryev P. Kravtsov M. Mikirtychiants S. Mikirtychiants A. Vasilyev F.M. Esser R. Greven G. Hansen F. Jadgfeld F. Klehr H. Soltner H. Straatmann D. Chiladze A. Garishvili N. Lomidze D. Mchedlishvili M. Nioradze M. Tabidze N. Akopov A. Avetisyan G. Elbakyan H. Marukyan S. Taroian P. Benati W. Erven F.J. Kayser H. Kleines P. Wuestner D. Bruncko J. Ferencei J. Musinsky J. Urban W. Augustyniak B. Marianski A. Trzcinski P. Zupranski S. Dymov A. Nass E. Steffens K. Rathsman P.E. Tegner P. Thoerngren Engblom R. De Leo G. Tagliente B. Kaempfer S. Trusov N. Buttimore H.O. Meyer (for the PAX Collaboration)
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classification nucl-ex
keywords pbar-pantiprotonantiprotonspolarizedbeamfirstinterestrange
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We propose to use an internal polarized hydrogen storage cell gas target in the AD ring to determine for the first time the two total spin-dependent pbar-p cross sections sigma_1 and sigma_2 at antiproton beam energies in the range from 50 to 450 MeV. The data obtained are of interest by themselves for the general theory of pbar-p interactions since they will provide a first experimental constraint of the spin-spin dependence of the nucleon-antinucleon potential in the energy range of interest. In addition, measurements of the polarization buildup of stored antiprotons are required to define the optimum parameters of a future, dedicated Antiproton Polarizer Ring (APR), intended to feed a double-polarized asymmetric pbar-p collider with polarized antiprotons. Such a machine has recently been proposed by the PAX collaboration for the new Facility for Antiproton and Ion Research (FAIR) at GSI in Darmstadt, Germany. The availability of an intense stored beam of polarized antiprotons will provide access to a wealth of single- and double-spin observables, thereby opening a new window on QCD spin physics.

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