Forward Neutron Asymmetry Persists at 410 GeV

1
Forward Neutron Asymmetry Persists at 410 GeV

2
PHENIX DAQ Hours
Average 7.8 DAQ hrs/day
38 DAQ hours in the previous week (6/1 6/7) 57
DAQ hours 5/24-5/31
days since April 17th
3
200 GeV pp Integrated Luminosity
(6/7/05)
PHENIX Goal 5.5 pb-1 live BBCLL1 (45 pol.)
June 25, 2005
5.81 pb-1 live ZDCLL1
(3.48 pb-1 projected, 3.31 pb-1 with
transverse running )
2.48 pb-1 live BBCLL1
55.8 B BBCLL1 events sampled
4
200 GeV pp Figure of Merit
(6/7/05)
PHENIX Goal 226 nb-1
June 25, 2005
(216 nb-1 projected, 204 nb-1 with transverse
running )
140 nb-1
5
Average Polarization
(6/7/05)
205 GeV development
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Transverse component in x-y region.
BLUE (AN 6.24)
YELLOW (AN 5.27)
(LR)
(LR)
commissioning
commissioning
PHYSICS run
PHYSICS run
(TB)
(TB)
Transverse component is systematically remaining
radial component. Vertical component seems 0.
(SPIN rotator and SNAKE are not changed)
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Plan for Transverse Running

• PHENIX needs 0.1pb-1 sampled transverse
  luminosity to limit the systematic effect of ATT
  on the ALL measurement
• Currently we are integrating luminosity at
  0.055nb-1 per day
• Less than three days of running required
• Polarization can be transverse (vertical), do not
  require radial!
• Want to limit the effect on longitudinal running!
• Switch to transverse running for STAR and PHENIX
  following June 13th beam experiments
• Run until PHENIX has 0.1pb-1 sampled
• Agreement with STAR to limit running to lt 60
  hours (morning of June 16th)

8
Run-6?

• What does PHENIX want for Run-6?
• The collaboration needs to discuss this in light
  of new results from both the CuCu and pp portions
  of Run-5
• Natural timescale for this is after the summer
  conferences
• PHENIX would benefit from a longer shutdown
• TOF-W installation, HBD engineering run
• Support within PHENIX for a long pp run
• Strong interest in running with radial
  polarization to study Sivers effect
• Ask CAD to keep this in mind while planning for
  Run-6
• Strong interest in a pp run at 62.4 GeV
• Reference dataset for RAA measurements