Freiburg 1999 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 7: Elektromagnetische und hadronische Proben I
HK 7.5: Talk
Monday, March 22, 1999, 15:15–15:30, E
p p → pp π0 with longitudinal beam and target polarization — •F. Rathmann1, J. Balewski2, W. Daehnick3, J. Doskow2, R. Flammang3, W. Haeberli4, B. Lorentz4, H.O. Meyer2, P.V. Pancella5, R.E. Pollock2, B.v. Przewoski2, T. Rinckel2, S.K. Saha3, B. Schwartz4, P. Thörngren Engblom2, and T. Wise4 — 1Physikalisches Institut II, Universit"at Erlangen-N"urnberg, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany — 2Indiana University Cyclotron Facility, Bloomington, IN 47408, USA — 3Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA — 4Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA — 5Physics Department, Western Michigan University, Kalamazoo, MI 49007, USA
Recently, the spin-dependent cross section Δ σ T, the spin correlation parameters Axx and Ayy, and the analyzing power Ay of the reaction p p → pp π0 was measured at beam energies of 325, 350, 375 and 400 MeV [1]. The experiment was carried out at the IUCF Cooler ring using a cooled polarized proton beam and an internal polarized gas target. The subject of this talk will be the measurements carried out in order to obtain the rema ining observables Δ σL, Axz and Azz. During these new measurements (at the same beam energies as given above) the beam polarization was aligned along the proton momentum vector (± z) and the target polarization was switched betw een horizontal (±x), vertical (±y) and longitudinal (±z) direction. Energy and angular information of the outgoing protons was measured and the mass and the emission angle of the neutral pion were deduced. A preliminary analysis of the data indicates a sizeable contribution of Ps final states.
[1] Phys. Rev. Lett, 81, 3096 (1998).