L1 EG2 efficiency on superclusters Clémentine Broutin, Alexandre Zabi, Pascal Paganini LLR – Ecole Polytechnique

Keeping only SC spread on 1 or 2 TT

Overview Run (good statistics, no timing scan, no EE energy features) Look for L1 candidate in same L1 region as highest energy crystal in SC Excluding masked regions (2.8% in EB, 5.4% in EE) Timing cut for SC (excluding out‐of‐time spikes) (13.4% in EB, 2.8% in EE) Excluding superclusters spread on more than 2 TT (17.3% in EB, 65.4% in EE)  Remove overall 33.3% of EB supercluster, 73.6% of EE superclusters 29/03/2010 Clémentine Broutin LLR -- Ecole Polytechnique 2

Precisions No double-counting of L1 candidates  for each event and each region, count only the highest E T supercluster Efficiency as a funtion of the supercluster raw E T :  E T corrections are not adapted to low energy (what we are looking at for the moment)  In the endcaps, raw energy, like trigger primitive, does not take the preshower into account 22/04/2010 Clémentine Broutin LLR -- Ecole Polytechnique 3

22/04/2010 Clémentine Broutin LLR -- Ecole Polytechnique 4 L1 EG2 efficiency on superclusters Run Look for L1 candidate in same L1 region as highest energy crystal in SC Excluding masked regions (2.8% in EB, 5.4% in EE) Timing cut for SC (excluding out‐of‐time spikes (13.4% in EB, 2.8% in EE) ) Excluding superclusters spread on more than 2 TT (17.3% in EB, 65.4% in EE)  Remove overall 33.3% of EB superclusters, 73.6% of EE superclusters

Back-up slides

No cut on the number of TT

22/04/2010 Clémentine Broutin LLR -- Ecole Polytechnique 7 L1 EG2 efficiency on superclusters Run Look for L1 candidate in same L1 region as highest energy crystal in SC Excluding masked regions (2.8% in EB, 5.4% in EE) Timing cut for SC (excluding out‐of‐time spikes (13.4% in EB, 2.8% in EE) )  Remove overall 16.2% of EB superclusters, 8.2% of EE superclusters

Same considerations, for SC belonging to electrons

22/04/2010 Clémentine Broutin LLR -- Ecole Polytechnique 9 L1 EG2 efficiency on electrons (EB) Run Look for L1 candidate in same L1 region as highest energy crystal in SC Excluding masked regions (3.4% in EB) Timing cut for SC (excluding out‐of‐time spikes (5.4% in EB) )  Remove overall 8.8% of EB superclusters

22/04/2010 Clémentine Broutin LLR -- Ecole Polytechnique 10 L1 EG2 efficiency on electrons (EB) Run Look for L1 candidate in same L1 region as highest energy crystal in SC Excluding masked regions (3.4% in EB) Timing cut for SC (excluding out‐of‐time spikes (5.4% in EB) ) Excluding superclusters spread on more than 2 TT (38% in EB)  Remove overall 46.8% of EB electrons