EMC EMC lvl1 Trigger Performance in RUN 02

1
EMC EMC lvl1 Trigger Performance in RUN 02
From Sasha Bazilevsky
Minimum bias High pt trigger
Matthias Grosse Perdekamp
May 22, 2002
2
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
3
Rates for run 03
Peak luminosity 1.6x1031cm-2s-1
gt Peak Rates into Level 1
500kHz Bandwidth into Event builder/DCM
gt 5kHz
(?)
Need rejection of about 500 at level 1
Thresholds between 2-3 GeV
Integrated Luminosity from RHIC gt
2.8pb-1/week Integrated Luminosity with PHENIX
up gt 1.0pb-1/week
Write 3x109 events corresponding to 120 days of
production on CCJ
4
W. Vogelsang and M. Stratmann
qq
gq
gg
5
Y. Goto
6
W. Vogelsang
Evidence that pQCD fits data for colliders down
to pT2 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.
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-M2,
HERA, ffs EMC, LEP, HERMES
7
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 PAGSgt40