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Homework responses

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Homework responses

- Redundancy lost – no full RPC only trigger possible
- No Bunch crossing information in outer ring (not instrumented in RPC3)
- Cosmic ray rejection based on time measurements on both sides not possible, no RPC information (RPC 3 out of range)
rejection worse by Factor 10: 5k events in 30 weeks

- Small reduction in cost (RPC1 electronsics cost 220k)

- Acceptance (2D): h = 1.4 1.2
- Redundancy between
RPC3 and 2 (A-C)

- Statistics: ~35% before Pt cuts
- However:
- Installation difficult
- Most interesting physics at
higher rapidity (see next page)

- Possible compromise:
only module 2D (thinner, can be on the south magnet, less interference)

- Data points:
- Events from RHICBOS + full detector simulation + reconstruction
- 1.2 < h < 2.2 both arms combined
- Efficiencies of acceptance and reconstruction (70-80%, including charge reconstruction)
- Smearing of the reconstructed momentum (through simulation and reconstruction)
- Fixed 3 / 1 Signal to background ratio (requires absorber + tighter cuts)
- 70 % beam polarization
- 300 (1300) pb-1 on tape corresponding roughly to RHIC projections until 2013 (and RHIC-II)

- Generated asymmetries
- Events RHICBOS, 1.2 < h < 2.2
- Smearing of the reconstructed momentum (performed accd. to smearing matrix in finer binning on polarized and unpolarized yields separately)

Unsmeared

Smeared

Unsmeared

Smeared

Basic cuts are cut 0,

Tight cuts have to be optimized

Raw RHICBOS

After efficiency and standard cuts

After smearing

- Fake high Pt background reduction by Factor 10 through absorber
- At least Factor 100 reduction by tight cuts
Signal to background 3/1

- u and d quark helicities are already fairly well known
- Sea helicities only limited in size, magnitude and sign still unkown

R.Seidl: W physics in the muon arms