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Simulation of V0A as trigger detector of the ALICE experiment .

Simulation of V0A as trigger detector of the ALICE experiment . Andrés Anzo Hernández (2008) Laura Helena González Trueba ( now ) A. Sandoval Instituto de Física UNAM. OUTLINE. Perform a simulation of 50 000 events from pp collisions minimum bias at 14 TeV with Pythia and AliRoot .

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Simulation of V0A as trigger detector of the ALICE experiment .

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  1. Simulation of V0A as trigger detector of theALICE experiment. Andrés AnzoHernández (2008) Laura Helena González Trueba (now) A. Sandoval Instituto de Física UNAM

  2. OUTLINE • Perform a simulation of 50 000 events from pp collisions minimum biasat14 TeV with Pythia and AliRoot. • Study the behavior of the V0A detector at these events. • Establishing correlations between variables of the detector (cell multiplicity, collected charge) and those which can not be measured experimentally (event multiplicity, inelasticity). • Study the selection power of V0A triggering on multiplicity or total collected charge.

  3. V0A scintillator hodoscope

  4. V0A detector anddistributionofhits

  5. The system can generate twelve triggers of level0: • 6 ofclass AND (V0A and V0C), 6 of class OR (V0A or V0C) • For each class, 5 triggers: • one beam-beam trigger (BB) • one beam-gas trigger (BG = BGA or BGC, according to the direction of the bakground) • three centrality triggers (CTQ1, CTQ2, CTMult) x1 x10 Pb-Pb MIP MIP/2 7 pC/ch p-p MIP 10 ns 7 pC/ch • CIU board for 8 channels readout bus connectors power supply connectors GTL transceivers voltage regulators voltage regulators HPTDC observation window generation hit detection (through observation windows) dual high speed integrator low threshold discriminator JYG, V0, CR6, March 20, 2006

  6. Chargedistributionfittedtocalibration data

  7. Vertex of particlesdetected

  8. Vertex of particlesdetected

  9. PdgCode of the detected particles. Primaries Secondaries

  10. Time of flight of detected particles.Primary Particles arrive before 11 ns 11ns

  11. Pseudorapiditydistribution of chargeprimaryparticles Transversemomentumdistribution

  12. Multiplicitydistribution of theprimarygeneratedparticles in thedirection of V0A

  13. Number of hits in the rings of V0A

  14. 15% of primary particles are within the ranges of pseudorapidity of V0A detector

  15. Number of cellswithsignal in V0A

  16. Total Charge of V0A

  17. ChargeofV0A vsnumberofprimaries

  18. V0A triggereventselection Multiplicity cut Charge cut

  19. V0A triggereffect in central rapidity

  20. Next • Do wewanttoimplement a highmultiplicitytriggerwiththe V0 forp-pevents at 7 TeV? • We can do a more detailedstudyandcorrelatetheresultswiththe data taken.

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