EMC EMC lvl 1 Trigger Performance in RUN

EMC + EMC lvl 1 Trigger Performance in RUN 0 From Sasha Bazilevsky Minimum bias High pt trigger Matthias Grosse Perdekamp May 22, 2002

Spin PWG Physics Goals from Run 02 Data From Naohito Saito Measure single spin asymmetries for identified particles Test to which level NLO QCD describes inclusive hadron spectra Matthias Grosse Perdekamp May 22, 2002

Rates for run 03 Peak luminosity: 1. 6 x 1031 cm-2 s-1 Bandwidth into Event builder/DCM ==> Peak Rates into Level 1 500 k. Hz ==> 5 k. Hz (? ) Need rejection of about 500 at level 1: Thresholds between 2 -3 Ge. V Integrated Luminosity from RHIC ==> 2. 8 pb-1/week Integrated Luminosity with PHENIX up ==> 1. 0 pb-1/week Write 3 x 109 events corresponding to 120 days of production on CCJ Matthias Grosse Perdekamp May 22, 2002

W. Vogelsang and M. Stratmann qq gq gg Matthias Grosse Perdekamp May 22, 2002

Y. Goto Matthias Grosse Perdekamp May 22, 2002

W. Vogelsang Evidence that p. QCD fits data for colliders down to p. T=2 Ge. V. This can be further studied using RHIC pp data from runs 02 (and 03). Charged and neutral pion spectra are sensitive to the Gluon Polarization. Input distributions: o Differences in the fragmentation functions will largely cancel in the asymmetry. o Variations in the unpolarized parton distributions have little effect on the asymmetry. o Significant experimental input: pdfs: SLAC, CERN-M 2, HERA, ffs: EMC, LEP, HERMES Matthias Grosse Perdekamp May 22, 2002

Summary o 5 weeks of spin commissioning o 3 weeks of physics with longitudinal polarization Measurement of gluon polarization in inclusive hadron production Operate PHENIX at 10 times higher luminosity o Physics run should be contingent on demonstrated P AGS>40% Matthias Grosse Perdekamp May 22, 2002