Belle II Summer Workshop 2023

1. Basf2 hands-on session

Samples

• Some mdst files were downloaded from the grid MC15ri_b for local tests, stored in the mdst folder. The local test steering script is 1_Reconstruction_local.py.

• The final version of the steering script is 1_Reconstruction_grid.py for generic and misID MC, 1_Reconstruction_grid_signal.py for signal MC. 2M signal (B± -> K± pi0) and 2M misID (B± -> pi± pi0), 200/fb generic mixed, charged, ssbar and ccbar samples. The output Ntuples are stored in the Ntuples folder.

• Only events in the signal region (abs(B_deltaE)<0.4) will eventually be used for the continuum suppression and template fitting (also with B_R2<0.45).

Components

Components	Selection
Signal	B_isSignal==1
misID	B_mcErrors==128
BBbar	B_mcErrors>0 and B_mcErrors!=128
qqbar	B_isContinuumEvent==True

• misID could be selected also by: K_isSignal!=1 and pi_isSignal==1 and K_genMotherPDG==pi_genMotherPDG and abs(K_genMotherPDG)==521

• BBbar could be selected also by: (K_isSignal==1 and B_isSignal!=1) or (K_isSignal!=1 and (K_genMotherPDG!=pi_genMotherPDG or abs(K_genMotherPDG)!=521))

Selections in the steering script

	Steps	Cuts
Signal B	1. Tracks	[abs(dz)<2] and [dr<0.5] and thetaInCDCAcceptance and [nCDCHits>20]
	2. Clusters	[clusterE>0.05] and [abs(clusterTiming)<formula(2*clusterErrorTiming)] and [abs(clusterTiming)<200] and inECLAcceptance and [beamBackgroundSuppression>0.5] and [fakePhotonSuppression>0.8]
	3. K±	good track and [kaonID_noSVD>0.9]
	4. Pi0	good cluster daughters and [0.115<M<0.15]
	5. B±	[Mbc>5.26] and [abs(deltaE)<0.5]
-	-	-
ROE	1. Tracks	[abs(dz)<20] and [dr<10] and thetaInCDCAcceptance and [nCDCHits>0] and [pt>0.075]
	2. Clusters	[clusterE>0.05] and [clusterNHits>1.5] and [abs(clusterTiming)<formula(2*clusterErrorTiming)] and [abs(clusterTiming)<200] and [beamBackgroundSuppression>0.2] and [fakePhotonSuppression>0.2]