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Study of high pt trigger at CBM

Study of high pt trigger at CBM. Z. Fodor, L. Boldizsar, G. Vesztergombi. 3 rd Future DAQ Workshop. GSI, Darmstadt. Oct. 11, 2005. NA49. NA57. New SPS data: R CP for h - , p, K ± , K 0 s , p, L. R CP (baryon)>R CP (meson) same systematics as original Cronin data at similar  s

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Study of high pt trigger at CBM

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  1. Study of high pt trigger at CBM Z. Fodor, L. Boldizsar, G. Vesztergombi 3rd Future DAQ Workshop GSI, Darmstadt Oct. 11, 2005

  2. NA49 NA57 New SPS data: RCP for h-, p, K±, K0s, p, L • RCP(baryon)>RCP(meson) • same systematics as original Cronin data at similar s • same systematics as RHIC but scaled upward

  3. RAA Same behavior for same Npart but better accuracy in CuCu RAAscales with Npart Vary system size at same energy

  4. NA49-PbPb = 17.3 GeV

  5. Tasks for trigger • Find the tracks coming from target in pp or pPb interactions in the relative not to high track density • Select the high momentum and high pt tracks • Using very few information and simple, fast approximation

  6. High pt trigger algorithm High pt means high momentum: greater than 10 GeV if pt > 5 Linearity approximation: last 2 planes of STS and TRD is a straight line Tangent crossing in the middle of the magnetic field at z=50cm

  7. STS and TRD Simulation Oct 04 11 10 12 7 8 9 PLANE: 6 5 4 3 2 bad: conversion electron 1 0 T good ALGORITHM: 1. ALL PAIRS in 5 and 12 PLANES 2. MATCHING in PLANE 7 3. YZ- Target matching 4. Calculate momentum and trigger > ptmin 5. Matching in PLANE 0

  8. z Z OUT OUT = ( + ) /2 Z z Z z IN MID IN MID High momentum approximation Magnetic field CURVED TRACK = IN-going + Out going TANGENT Crossing in the middle of field area px,pz= [ ]Xout,aout a Target Target position and out-going tangent is known: momentum is calculable !

  9. TRIGGER SELECTIVITY 1 million pBe events generated using Oct 04 simulation No pile-up STRAIGHT track trigger (5+7+12 (planes)): 228 CURVED track trigger (0 + STRAIGHT): 25 including 2 ghosts Rejection factor : 1: 40 000 with 90% purity

  10. Benchmark NA49pp at E = 158 GeV 30 events/spill Events Energy > 3 GeV/c > 4 GeV/c > 5 GeV/c 2106158 100 1 0.01 Estimates with the assumption 109 proton/sec 107 interaction/sec 1 day=1012 158 5 108 5 106 5 104 Suppression 10-1 10-2 10-3 1 day=1012 90 5 107 5 104 50 20 day=2 1013 90 109 106 103 Suppression 10-3 10-5 10-10 20 day=2 1013 45 106 10 0

  11. The next teps • If the DAQ configuration is fixed, we want to implement in the SystemC, the program is running in Budapest, until now we are studied the C-net configuration • To study the effects of the pileup

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