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Update on RICH x EMCal Trigger Studies

This document provides an overview of the latest findings from the RICH x EMCal trigger studies conducted at Reed College and the RIKEN BNL Research Center. It covers local Level 1 trigger functionalities, J/ψ electron triggers, and charged hadron triggers, including significant applications in heavy flavor production. The study evaluates various triggering designs and their efficiency, detailing requirements for RICH and EMCal correlations, as well as the impact of pion channels and transversity on trigger effectiveness. Further work includes physics background analyses and asymmetry analysis programs for real data preparation.

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Update on RICH x EMCal Trigger Studies

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  1. Update on RICH x EMCal Trigger Studies Ben Lillie Outline: • Overview of Local Level 1 trigger • Update on J/ electron triggers • Charged hadron triggers Reed College / RIKEN BNL Research Center

  2. Studies of possible applications of the Local Level 1 trigger • Heavy Flavor Production • Dimitrios Galanakis, Wei Xie • J/ decay • Kenta Shigaki, Ken Oyama, Takashi Matsumoto •  decay • Mike Bick • single charged π, and charged π pairs • Ben Lillie Reed College / RIKEN BNL Research Center

  3. Trigger layout Trigger studies simulate logic in FPGA on Local Level 1 board. Reed College / RIKEN BNL Research Center

  4. Trigger Logic • ΣEMCal2x2 (jet trigger) • Count of EMCal trigger tiles above the 2x2 (first) threshold • ΣRICH (trigger bias and possible jet trigger) • Count of RICH trigger tiles above threshold. • ΣRICH with separation ( and J/Ψ trigger) • Count of RICH trigger tiles above threshold, requiring a minimum separation between counts. • EMCal2x2 x RICH (e+/- from heavy flavor, J/Ψ, , e-mu) • Require a hit in the EMCal correlated with a hit in the RICH • EMCal4x4 x RICH (e+/- from Drell-Yan and W) • Require a hit in the EMCal using 4x4 tiles correlated with a hit in the RICH • EMCal4x4 x RICH (charged pion trigger) • Require a hit in the RICH and no hits in correlated EMCal tiles. Reed College / RIKEN BNL Research Center

  5. EMCal x RICH Trigger Reed College / RIKEN BNL Research Center

  6. J/Ψ Update • Possible RICH only triggers: 1. - Require 1 RICH trigger tile to fire. 2. - Require 2 RICH trigger tiles to fire. 3. - Require 2 RICH trigger tiles to fire, and that there be a minimum distance between the tiles. 4. - Require 2 RICH trigger tiles to fire, not counting tiles adjacent to other tiles that have fired. Passes all triggers Fails trigger 4 Reed College / RIKEN BNL Research Center

  7. RICH x EMC window efficiency

  8. ΔG Charged pion channel  Reed College / RIKEN BNL Research Center

  9. Transversity pion channel Jet chiral-odd fragmentation function Jet chiral-odd QCD process Proton spin Normal to pion plane Since transversity involves a chirality flip, and QCD preserves chirality, we need a chiral-odd fragmentation function. Jaffe, Tang, Jin - Use two-meson interference. Reed College / RIKEN BNL Research Center

  10. RICH x EMCal window Trigger • Characteristics of a hard pion in PHENIX: • Will leave a signal in the RICH ( p > 3.5 GeV) • Will leave only minimum-ionizing energy in the EMCal • Possible Trigger designs: • RICH • Require one RICH trigger tile to fire. • RICH x EMCal • Require one RICH trigger tile to fire, and none of the corresponding EMCal tiles to fire. • RICH x EMCallow • Require one RICH trigger tile to fire and one of the corresponding EMCal tiles to fire. • RICH x EMCalhigh x EMCallow (window) • Require one RICH trigger tile to fire and one of the corresponding EMCal tiles to be above a low threshold and none of the corresponding tiles to be above a high threshold. Reed College / RIKEN BNL Research Center

  11. RICH x EMC window rejection power High threshold = 1.5 GeV Low threshold = 0.3 GeV Low threshold = 0.0 GeV

  12. RICH x EMC window π+/- pair efficiency, low threshold = 0.3 GeV

  13. EMC Multiplicity Distributions Cut at 0.2 GeV Cut at 0.35 GeV Reed College / RIKEN BNL Research Center

  14. EMC Multiplicity trigger rejection power

  15. EMC Multiplicity trigger π+/- efficiency

  16. Possible z - bias Reed College / RIKEN BNL Research Center

  17. Ejet correlation We want a quantity that correlates well with Ejet. Best candidate: total pion momentum. Reed College / RIKEN BNL Research Center

  18. Further work • Include model calculations of transversity and fragmentation functions • Estimate size of observed asymmetry. • Physics background studies (dilution from other physics processes). • Systematics (detector resolution, biases) • Develop asymmetry analysis program in preparation for real data. Reed College / RIKEN BNL Research Center

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