1. Study of muons rejection on single p and minimum bias forced with PionDecayer tool

2. Samples and MC Selection
Signal sample:
Single m at various pT (~1.5M events)
Background simulated with p/K forced to decay ( with PionDecayer tool)
Minimum bias (~113k events)
Single p (~1M events)
Selected MC generated m with |h|<2.7 coming from a forced decay of p/K (also with |h|<2.7)
MC events selected: min bias ~56k
single pion ~930k

3. Cut strategy
Select events running full muon trigger slice on (LVL1, LVL2 and standard EF)
no last optimized version of MuComb
pT>2GeV cut LVL2
Define a set of critical variables
ID d0, # pixel hits, hit on B layer, # SCT hits
Ratio of pT in ID and MS
Combined match c2
Evaluate efficiency of each cut w.r.t. standard EF combined muon
EF efficiency w.r.t. LVL2 on single m (p) ~95% (~90%)

4. optimal cut could be different at different pT
Cut power rejection
Efficiencies for signal and fake as a function of exclusive cuts
# pixel d0
# SCT
pT(ID)/pT(MS)
optimal cut could be different at different pT
Each cut is evaluated w/o applying the other cuts
Match c2
muons
pions
Here a choice of cuts (red arrows) in the assumption of nominal detector performance

5. Efficiency (single particle samples)
Applied cuts
Inner Detector d0 ≤ 0.15
ID number of pixel hits ≥ 3
ID number of B layer hits ≥ 1
ID number of SCT hits ≥ 6
pT (ID) / pT (SA) ≤ 1.25
Combined match c2 ≤ 26
Single m efficiency loss between
4GeV
20GeV
Forced single p efficiency reduced at
4GeV
20GeV

6. Efficiency for p/K in minimum bias
Compatible with results on single p sample, high statistical errors
separated contribution for pions and kaons after all cuts are applied
Kaons are cutted away more easily than pions:
candidates
no cut
cut
Kaons 98 50
Pions
840
586

7. Backup

8. Reconstruction selection
Required first LVL1 threshold (totally open) passed and LVL2 pT>2GeV (no optimized MuComb of rel13)
At EF level, found ID track used for combination using closest DR
Applied following cuts to ID track
Inner Detector d0 ≤ 0.15
ID number of pixel hits ≥ 3
ID number of B layer hits ≥ 1
ID number of SCT hits ≥ 6
Found MS track (SA) used for combination requiring same RoI index
EF level to have at least one combined track with
pT (ID) / pT (SA) < 1.25
Combined match c2 ≤ 26
events triggered and passed to EF: min bias
single pion 73551
LVL1 events triggered: min bias
single pion 82619
events passing all EF cuts: min bias
single pion 44953