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FVTX Trigger Performance on pAu at RIKEN/RBRC

Trigger performance comparison between the Au-going and p-going directions at RIKEN/RBRC's FVTX, with emphasis on trigger thresholds and track rates. Running conditions, efficiency, and multiplicity triggers are discussed, along with ongoing data analysis tasks related to track distributions, correlations, and trigger optimization. Notable findings include a strong trigger performance in the Au-going direction and the persistence of long tail track multiplicities in the p-going direction even after applying cuts. The study aims to enhance event selection and improve data interpretation for high multiplicity events.

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FVTX Trigger Performance on pAu at RIKEN/RBRC

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  1. FVTX Trigger Performance on pAu RIKEN/RBRC Itaru Nakagawa 1

  2. FVTX Trig Threshold Dependence (South Au-going) ≥12 MB ≥12 ≥14 ≥14 ≥16 ≥16 ≥18 ≥18 #track Threshold 12 14 16 18 Rates [kHz] 60 32 18 8.6 Purity >=25 0.31 0.46 0.65 0.79 The trigger performance of Au-going direction is much better than pp case. We are running at threshold ≥18 which provides about 80% purity. 2

  3. FVTX Trig Threshold Dependence (North p-going) 3

  4. Started Data Taking from May 7th 4 So far coincidence with BBCLL1 narrow

  5. 10 10 10 10 10 10 10 10 0.2 0.4 0.6 0.8 0 0 2 3 4 5 2 3 4 5 1 0 0 sigma sigma turn on turn on plateau plateau 2c / ndf 2c / ndf 5 5 5 Rejection Power=173 10 10 10 0.3472 ± 0.3472 0.04727 ± 0.04727 Purity(20)= 0.926 Number of Tracks per Event (South) Number of Tracks per Event (South) 15 15 15 23.52 ± 23.52 Trigger Efficiency (South) ± 0.006025 2162 / 47 2162 / 47 ± 0.09339 0.006025 ± 0.0439 0.09339 20 20 20 0.0439 Running Condition 30 25 25 25 30 30 cfg.sector.nstation.thre = 3 cfg.combination = single cfg.sector.nhit.thre = 1 trig mode = multitrack cfg.arm.logic = AND cfg.fem.logic = OR cfg.cage.thre = 9 cfg.adc.thre = 1 sigma sigma turn on turn on plateau plateau 2c / ndf 2c 35 35 35 / ndf Number of Tracks Number of Tracks Number of Tracks 40 40 40 predicted fired BBCnarrow total 0.3148 ± 0.3148 Entries Entries Entries 2247 Entries 2247 Entries 2409 Entries 2409 Entries 389429 Entries 389429 Entries 389429 Entries 389429 0.05424 ± 0.05424 45 23.52 ± 23.52 45 45 ± 0.005858 2063 / 47 2063 / 47 ± 0.04683 0.005858 ± 0.1262 0.04683 50 50 50 0.1262 • Trigger threshold>=18/arm 0 0 2 • Good GL1 matching efficiency > 95% 10 10 10 10 10 10 0.2 0.4 0.6 0.8 10 10 0 0 3 4 2 3 4 1 0 0 sigma sigma turn on turn on plateau plateau c / ndf c 2 2 / ndf 100 100 100 0.2348 ± 0.2348 200 200 200 90.22 ± 90.22 519.2 ± 519.2 ± 0.009466 91.83 / 97 91.83 / 97 0.009466 300 300 300 ± 2.423 ± 5.516 Number of Hits per Event (South) Number of Hits per Event (South) 2.423 5.516 Efficiency w.r.t BBC narrow Trigger Efficiency (South) 400 400 400 500 500 500 600 600 600 700 700 700 800 800 800 Number of Hits Number of Hits Number of Hits predicted fired BBCnarrow total Entries Entries Entries 2247 Entries 2247 Entries 2409 Entries 2409 Entries 389429 Entries 389429 Entries 389429 Entries 389429 900 1000 900 1000 900 1000 0 0 5

  6. High Multiplicity Trigger Trigger Allocated Rates Total Expected Trigger BBC Centrarity 500 ~ 2 kHz 500~2000 Mevents FVTX South HighMult 100~200 Hz 100~200 Mevents FVTX North HighMult 100~200 Hz 100~200 Mevents • The main triggers will be Au-going side trigger. • South FVTX High multiplicity trigger will have 100Mevents whose purity is about 80%. Thus we will have 80M real high multiplicity events on data. • Signal is expected to be smaller than dAu. 80M x 2~3 will be a good goal to be set. 6

  7. Homeworks from the last week • Online track vs. Offline track correlation for North and South, separately to address why Au-going turn on is so good. (SeYoung) • # of track distribution comparison between 500GeV, 200GeV pp, and pAu (North and South separately). (Toru) • BBC high multiplicity trigger vs. FVTX high multiplicity trigger (Hiroshi, Itaru) • # of track distribution in VTX for FVTX trigger and BBCLL1(>0 tubes)_central35_narrowvtx (Theo) • Correlation between North vs. South high multiplicity (Itaru) • Investigate if the long tail of p-going direction in FVTX track multiplicity distribution disappears by Narrow z-VTX cut (Itaru) • Process more MB events to argue higher multiplicity for North performance (itaru/Volunteer?) 7

  8. FVTX Track Multiplicities pp vs pAu Plot by Toru Nagashima Track multiplicity/arm in FVTX  Multiplicity : pp200 < p-going (pA) < pp500 < pAu as expected.  p-going dist shows extensively long and flat tail towards higher multiplicity which is unique compared to pp. 8

  9. Long flat tail of p-going side North FVTX Track Multpilicity pp BBC noVTX BBC narrow VTX The long and flat tail seems to stay even the narrow VTX is required. 9

  10. FVTX North vs South Correlation 510 GeV pp 200 GeV pAu 200 GeV South Barely seen correlation in pp Rather visible correlation is seen in between large rapidity gap N and South. May be worthy to consider S&N trigger. Presently, South trigger is prescaled by 4~8. North 10

  11. Summary • Started physics data taking with FVTX high multi trigger from May 7that total rates ~300Hz. • Long tail in FVTX track multiplicity of p-going remains after BBC narrow cut. Not yet sure if it is background or physics. • Multiplicity correlation for MB, BBC-centrarity, FVTX trigger study of in BBC,FVTX,CNT,VTX for pp/pA analysis is ongoing with Hiroshi’s and Theo’s help. 11

  12. From May 7thpresentation BACKUP 12

  13. # of Track Distribution in FVTX Hists are not normalized. South (Au-going) North (p-going) # of reconstructed track in FVTX / arm 13

  14. 10 10 10 0 10 10 10 10 1 10 0.2 0.4 0.6 0.8 10 10 10 10 10 10 10 10 0.2 5 0.4 0.6 0 0.8 10 10 0 0 2 3 4 2 1 3 4 5 1 2 3 4 5 2 3 4 5 1 0 0 0 0 sigma sigma turn on turn on plateau plateau 2c / ndf 2c sigma sigma turn on turn on plateau plateau 2c 2c / ndf / ndf / ndf 5 5 5 5 5 5 Rejection Power=9 Rejection Power=115 10 10 10 10 10 10 Purity(20)= 0.606 Purity(20)= 0.124 0.9679 ± 0.9679 Number of Tracks per Event (South) Number of Tracks per Event (South) Number of Tracks per Event (North) Number of Tracks per Event (North) 15 4.025 ± 4.025 17.49 ± 17.49 15 15 0.8487 ± 0.8487 15 3.798 ± 3.798 15 15 17.89 ± 17.89 Trigger Efficiency (South) Trigger Efficiency (North) 917.6 / 47 917.6 / 47 ± 0.01644 ± 0.02316 ± 0.00128 559.5 / 47 559.5 / 47 ± 0.05426 0.01644 0.02316 0.00128 South (Au-going) ± 0.0215 20 20 20 0.05426 ± 0.1291 20 20 20 North (p-going) 0.0215 0.1291 25 25 25 25 25 25 30 30 30 30 30 30 cfg.sector.nstation.thre = 3 cfg.sector.nstation.thre = 3 cfg.combination = single cfg.combination = single cfg.sector.nhit.thre = 1 trig mode = multitrack cfg.sector.nhit.thre = 1 trig mode = multitrack cfg.arm.logic = AND cfg.arm.logic = AND cfg.fem.logic = OR cfg.fem.logic = OR cfg.cage.thre = 6 cfg.cage.thre = 6 cfg.adc.thre = 1 cfg.adc.thre = 1 sigma sigma turn on turn on plateau plateau 2c 2c / ndf sigma sigma turn on turn on plateau plateau 2c 2c / ndf 35 35 35 35 35 35 / ndf / ndf Number of Tracks Number of Tracks Number of Tracks Number of Tracks Number of Tracks Number of Tracks 40 40 40 40 40 40 predicted fired total predicted fired total 0.9818 ± 0.9818 Entries Entries Entries 68551 Entries 68551 Entries 625122 Entries 625122 Entries 65067 Entries 65067 Entries 625122 Entries 625122 Entries Entries Entries 6602 Entries 5433 Entries 5433 Entries 6602 Entries 625122 Entries 625122 Entries 625122 Entries 625122 0.8899 ± 0.8899 45 17.94 ± 17.94 45 45 45 3.858 ± 3.858 45 45 18.66 ± 18.66 3.98 ± 3.98 ± 0.001013 535.1 / 47 535.1 / 47 1164 / 47 1164 / 47 ± 0.02255 0.001013 ± 0.05933 ± 0.02405 ± 0.0158 ± 0.1423 0.02255 0.05933 0.02405 50 50 50 50 50 50 0.0158 0.1423 0 0 0 0 10 10 10 10 10 10 10 10 0 10 10 10 10 10 0.2 0.4 0.6 0.8 0.2 0.4 0.6 0.8 10 10 10 1 2 3 4 2 3 4 3 1 1 0 0 2 3 4 2 4 0 1 0 1 1 0 0 0 sigma sigma turn on turn on plateau plateau c / ndf c sigma sigma turn on turn on plateau plateau c / ndf c 2 2 2 2 / ndf / ndf 100 100 100 100 100 100 0.7858 ± 0.7858 200 200 200 200 200 200 0.09248 ± 0.09248 70.94 ± 70.94 318.2 ± 318.2 48.11 ± 48.11 244.1 ± 244.1 ± 0.002689 824.5 / 97 824.5 / 97 2194 / 97 2194 / 97 0.002689 ± 0.9169 300 ± 0.0022 300 300 ± 0.2956 ± 0.5827 300 300 300 0.9169 ± 2.032 0.0022 0.2956 0.5827 Number of Hits per Event (North) Number of Hits per Event (North) Number of Hits per Event (South) Number of Hits per Event (South) 2.032 Trigger Efficiency (North) Trigger Efficiency (South) 400 400 400 400 400 400 500 500 500 500 500 500 600 600 600 600 600 600 700 700 700 700 700 700 Threshold>=12 track/arm (same as pp run) 800 800 800 Number of Hits Number of Hits Number of Hits 800 800 800 Number of Hits Number of Hits Number of Hits predicted fired total predicted fired total Entries Entries Entries 5433 Entries 6602 Entries 5433 Entries 6602 Entries 625122 Entries 625122 Entries 625122 Entries 625122 900 1000 900 1000 900 1000 Entries Entries Entries 68551 Entries 68551 Entries 65067 Entries 625122 Entries 65067 Entries 625122 Entries 625122 Entries 625122 900 1000 900 1000 900 1000 0 0 14 0 0

  15. 10 10 10 10 10 10 10 10 0.2 0.4 0.6 0.8 0 0 2 3 4 5 2 3 4 5 1 0 0 sigma sigma turn on turn on plateau plateau 2c / ndf 2c / ndf 5 5 5 Rejection Power=66 10 10 10 Purity(20)= 0.915 Number of Tracks per Event (South) Number of Tracks per Event (South) 0.8842 ± 0.8842 15 15 15 3.687e+04 / 47 3.687e+04 / 47 10 10 10 10 10 10 10 10 0.02004 0.02004 0.2 0.4 0.6 0.8 17.49 17.49 0 0 2 3 4 5 2 3 4 5 Trigger Efficiency (South) 1 0 0 ± 0.5463 20 20 20 0.5463 sigma sigma turn on turn on plateau plateau 2c 2c / ndf ± ± ± ± 1 1 1 1 / ndf 5 5 5 Rejection Power=16 25 25 25 Turn On (South) 10 10 10 30 30 30 cfg.sector.nstation.thre = 3 Purity(20)= 0.780 cfg.combination = single 0.9679 ± 0.9679 Number of Tracks per Event (South) Number of Tracks per Event (South) cfg.sector.nhit.thre = 1 trig mode = multitrack 15 4.025 ± 4.025 17.49 ± 17.49 15 15 cfg.arm.logic = AND cfg.fem.logic = OR cfg.cage.thre = 9 cfg.adc.thre = 1 sigma sigma turn on turn on plateau plateau 2c / ndf 2c Trigger Efficiency (South) 35 35 35 917.6 / 47 917.6 / 47 / ndf ± 0.01649 ± 0.02317 ± 0.00128 0.01649 0.02317 0.00128 20 20 20 Number of Tracks Number of Tracks Number of Tracks 40 40 40 predicted fired total 25 25 25 0.009111 ± 0.009111 0.5758 ± 0.5758 Entries Entries Entries 68551 Entries 68551 Entries 9396 Entries 9396 Entries 625122 Entries 625122 Entries 625122 Entries 625122 45 45 45 28.44 ± 28.44 30 30 30 cfg.sector.nstation.thre = 3 ± 0.004213 cfg.combination = single ± 1.77e-07 6864 / 47 6864 / 47 cfg.sector.nhit.thre = 1 trig mode = multitrack 0.004213 cfg.arm.logic = AND 1.77e-07 cfg.fem.logic = OR 50 50 50 cfg.cage.thre = 7 ± 1.414 cfg.adc.thre = 1 sigma sigma turn on turn on plateau plateau 2c / ndf 2c 1.414 35 35 35 / ndf Number of Tracks Number of Tracks Number of Tracks 0 0 40 40 40 predicted fired total 0.9597 ± 0.9597 Entries Entries Entries 68551 Entries 68551 Entries 38090 Entries 38090 Entries 625122 Entries 625122 Entries 625122 Entries 625122 45 4.433 ± 4.433 21.66 ± 21.66 45 45 10 10 10 10 10 10 0.2 0.4 0.6 0.8 10 10 ± 0.002069 721.1 / 47 721.1 / 47 0 0 2 3 4 2 3 4 0 1 0 1 ± 0.02194 ± 0.03503 0.002069 1 0.02194 0.03503 50 50 50 sigma sigma turn on turn on plateau plateau c c / ndf 2 2 / ndf 100 100 100 0 0 0.7858 ± 0.7858 200 200 200 70.94 ± 70.94 318.2 ± 318.2 ± 0.002689 10 10 10 10 10 10 2194 / 97 2194 / 97 0.002689 0.2 0.4 0.6 0.8 10 10 ± 0.2956 ± 0.5827 300 300 300 0.2956 0.5827 Number of Hits per Event (South) Number of Hits per Event (South) 0 0 2 3 4 2 3 4 0 1 0 1 1 Trigger Efficiency (South) sigma sigma turn on turn on plateau plateau c / ndf c 2 2 400 400 400 / ndf 100 100 100 0.7858 ± 0.7858 500 500 500 200 200 200 70.94 ± 70.94 318.2 ± 318.2 ± 0.002689 2194 / 97 2194 / 97 0.002689 ± 0.2956 ± 0.5827 300 300 300 600 600 600 0.2956 0.5827 Number of Hits per Event (South) Number of Hits per Event (South) Trigger Efficiency (South) 400 400 400 700 700 700 500 500 500 800 800 ≥18 800 Number of Hits Number of Hits Number of Hits predicted fired total 600 600 600 Entries Entries Entries 68551 Entries 9396 Entries 68551 Entries 9396 Entries 625122 Entries 625122 Entries 625122 Entries 625122 900 1000 900 1000 900 1000 700 700 700 800 800 800 ≥14 Number of Hits Number of Hits Number of Hits 0 0 predicted fired total Entries Entries Entries 68551 Entries 68551 Entries 625122 Entries 625122 Entries 38090 Entries 38090 Entries 625122 Entries 625122 900 1000 900 1000 900 1000 0 0 ≥16 Somehow South trigger is not suffered from low # of track events. Very good purity. 15

  16. Turn On (North) ≥18 ≥14 ≥16 16

  17. Threshold Dependence ≥12 ≥14 ≥16 ≥18 South (Au-going) North (p-going) 17

  18. Rates and Purity North (p-going) Threshold 12 14 16 18 Rates [kHz] 27 9.2 4.5 2.7 Purity >=20 0.124 0.22 0.225 0.215 Purity >=25 0.025 0.06 0.112 0.147 South (Au-going) Threshold 12 14 16 18 Rates [kHz] 60 32 18 8.6 Purity >=20 0.60 0.78 0.89 0.92 Purity >=25 0.31 0.46 0.65 0.79 • • BBC rate of 350kHz. The rates can be increased > 1MHz as MCR improves the beam Rates are before BBCnarrow coincidence. The rates will go down by factor of 5 with BBCnarraw. 100Hz data taking will provides 100Mevents total in pAu. Thanks to good South purity, we can expect 100Mevents * 0.7 = 70M high multiplicity events. • 18

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