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Performance Review of Muon Trigger Systems Without RPC1: Challenges and Potential Gains

This document analyzes the performance of muon trigger systems lacking RPC1 components, identifying significant issues such as redundancy loss and lack of bunch crossing information. The absence of effective cosmic ray rejection mechanisms has resulted in a tenfold increase in background events over 30 weeks. Moreover, the report discusses the impact of introducing RPC2s on acceptance rates, while highlighting the difficulties associated with installation. It concludes with a detailed review of simulation results from RHICBOS, including efficiencies, background noise reduction, and current understanding of helicity distributions in quarks.

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Performance Review of Muon Trigger Systems Without RPC1: Challenges and Potential Gains

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  1. Homework responses

  2. 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)

  3. 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)

  4. 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)

  5. Smeared backward Unsmeared Smeared

  6. Smeared forward Unsmeared Smeared

  7. Overall reconstruction efficiency and fake rate Basic cuts are cut 0, Tight cuts have to be optimized

  8. Smearing matrix for 100 resolution

  9. Muons in 1.2 < h < 2.2 Raw RHICBOS After efficiency and standard cuts After smearing

  10. Abrober 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

  11. Current knowledge of helicity 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

  12. Polarized parton xBj ranges (RMS)

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