EMC + EMC lvl1 Trigger Performance in RUN 02. 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.
From Sasha Bazilevsky
High pt trigger
Matthias Grosse Perdekamp
May 22, 2002
From Naohito Saito
Measure single spin asymmetries
for identified particles
Test to which level NLO QCD
describes inclusive hadron spectra
Peak luminosity: 1.6x1031cm-2s-1 ==> Peak Rates into Level 1 500kHz
Bandwidth into Event builder/DCM ==> 5kHz (?)
Need rejection of about 500 at level 1: Thresholds between 2-3 GeV
Integrated Luminosity from RHIC==> 2.8pb-1/week
Integrated Luminosity with PHENIX up ==> 1.0pb-1/week
Write 3x109 events corresponding to 120 days of production on CCJ
Evidence that pQCD fits data for colliders down to pT=2 GeV.
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.
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-M2,
HERA, ffs: EMC, LEP, HERMES
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 PAGS>40%