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Homework responses. Comment on Muon Trigger performance w/o any RPC1’s. Redundancy lost – no full RPC only trigger possible No Bunch crossing information in outer ring (not instrumented in RPC3)

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Comment on muon trigger performance w o any rpc1 s
Comment on Muon Trigger performance w/o any RPC1’s

  • 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)


Comment on performance gains from adding back rpc2 s
Comment on performance gains from adding back RPC2’s

  • 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)


Describe in detail what is and is not included in a l simulation results
Describe in detail what is and is not included in A_L simulation results

  • 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)


Smeared backward
Smeared backward simulation results

Unsmeared

Smeared


Smeared forward
Smeared forward simulation results

Unsmeared

Smeared


Overall reconstruction efficiency and fake rate
Overall reconstruction efficiency and fake rate simulation results

Basic cuts are cut 0,

Tight cuts have to be optimized



Muons in 1 2 h 2 2
Muons simulation results in 1.2 < h < 2.2

Raw RHICBOS

After efficiency and standard cuts

After smearing


Abrober and cuts
Abrober simulation results and cuts

  • Fake high Pt background reduction by Factor 10 through absorber

  • At least Factor 100 reduction by tight cuts

     Signal to background 3/1


Current knowledge of helicity distributions
Current knowledge of simulation resultshelicity distributions

  • 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


Polarized parton x bj ranges rms
Polarized parton x simulation resultsBj ranges (RMS)


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