Results from the Spin Program at COSY-ANKE

FEATURING : ALTO • Spin Program at COSY - ANKE Precision Mass Measurements

Kaon pair production in proton-proton collisions at COSY-ANKE

The near-threshold production of kaon-pairs has been investigated in protonproton collisions at Cooler Synchrotron (COSY)at Forschungszentrum Jülich. In the pp → ppKK reaction, the invariant mass distributions of Kp, Kpp, and KK indicate the presence of both Kp and KK final state interactions. Total cross sections for pp → ppφ reaction have been determined at excess energies ε of 18.5, 34.5, an...

Recent results from the STAR spin program at RHIC

The STAR experiment uses polarized p+p collisions at RHIC to determine the contributions to the spin of the proton from gluon spin and from orbital angular momentum of the quarks and gluons. Selective STAR measurements of the longitudinal double spin asymmetry for inclusive jet and inclusive hadron production are presented here. In addition, we report measurements of the transverse spin asymmet...

Spin-Flipping Polarized Deuterons At COSY

We recently stored a 1.85 GeV/c vertically polarized deuteron beam in the COSY Ring in Jtilich; we then spin-flipped it by ramping a new air-core rf dipole's frequency through an rfinduced spin resonance to manipulate the polarization direction of the deuteron beam. We first experimentally determined the resonance's frequency and set the dipole's rf voltage to its maximum; then we varied its fr...

Excited Hyperons Produced in Proton-proton Collisions with Anke at Cosy

Excited neutral hyperons Y 0∗ produced in the pp → pKY 0∗ reaction with a COSY beam momentum of 3.65 MeV/c have masses below 1540 MeV/c. The ANKE spectrometer allows the simultaneous observation of different decay modes: Y 0∗ → πΣ, π∓Σ±, π0Λ,K−p by measuring kaons and pions of either charge in coincidence with protons. We have found indications for a neutral excited hyperon resonance Y 0∗ with ...