EMCal L1 Trigger studies

L1 trigger studies : rates and efficiencies
Contact : ALICE Grenoble ALICE_PHYS-L@lpscNOSPAMPLEASE.in2p3.fr mailing list

Strategy

• Study the correlation betweeen the rate, the threshold, and the patch size
• Estimate the patch size and thresholds to reject enough events at the L1 level
• Estimate the efficiency dependance with the different variables

Links

ALICE EMCal trigger summary

• EMCal L1 trigger twiki : preparation of the 2011 PbPb run

Presentations

• APW in Finland (Nicolas) : talk
• L1 trigger commissioning - trigger meeting (Rachid) : talk
  • Il semble y avoir une inconsistance (a comprendre) avec le resultat de Nico obtenu a partir de la voie energie avec un seuil attendu de 16GeV alors qu'on serait plutot autours de 10GeV (gros ecart de freq pour ces 2 valeurs).
• L1 trigger rate study (Nicolas) : talk
• L1 status summary (Rachid) : talk
• July Physics' week (Matseuz) : talk
• EMcal meeting (Nico) : EMCal jet trigger studies

Ungoing (20 Jul.)

• Embedding : progressing but with some issues still to fix

description of the situation Hide Details

• QA with a good run

Suggestions

1. Plot of the patch spectrum energy spectrum - min bias and for the few centrality bins
2. integrated yield above the threshold - namely:
   • you start with the E-spectrum of the patch - histogram A
   • you slide through the x-axis and fill a new histogram B with the integral-i of the A from current-xbin-i to infinity and you call B->SetBinContent(xbin-i, integral-i)
     • From the histogram-B we should readout the threshold x-axis for the given rejection y-axis...
     • This (histogram-B) would be useful to see for all possible patches AND for the maximum energy patch.
3. the ratio of the FEE patch energy sum spectra above the patch threshold, to the same spectrum without the patch energy requirement for 24x24, 32x32, or 40x40 patch size. To be done on p-p collisions.
4. Estimate the rejection factor for several patch energy threshold with the p+p data.

• slides :
  • slide 3 : do MinBias
  • slide 7 : exactly what you want for jet trigger. Do the same for the shower trigger. Map centrality with v0. Eg: if you cut at 40, what is your rejection factor
  • biais in the physics : embedding + eff
    • put some jets in it

Project log

Wednesday 20 July

• (Nico) updated study in EMcal trigger twiki after founding a bug
• (Nico) Embedding : progressing but with some issues still to fix
• (Nico) QA with a good run in progress

Tuesday 19 July

• Documentation of the ALICE trigger twiki : EMCal L1 trigger twiki

June

• (Nico) presentation for Thursday's EMCal meeting EMCalMeeting_23062011-3

-- CatherineSilvestre - 19-Jul-2011