Lepton miss ID and non-B peaking background                                                                        Kenji Hamano

Last modified : Nov 11, 2005                                              Back to Home Back to privious page

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R16b skims Run3 was used.
Data luminosities:

	luminosity	# events	# files
OnPeak	30.630 fb-1	17527801/438622047	877
OffPeak	2.394	659867/31451100	33

MC luminosity is adjusted to 30 fb-1

MC mode	cross section	selection rates	# events	# files
BpBm (1235)	0.525e6 fb	23854196/86492000	4343795	218
B0B0bar (1237)	0.525e6	17081965/61158000	4399112	220
ccbar (1005)	1.30e6	6127861/57700000	4141882	208
uds (998)	2.09e6	5639210/124040000	2850520	143
tautau (3429)	0.94e6	544465/69852000	219806	11

Example of calculatin of # events:
      BpBm: 0.525e6*30*23854196/86492000 = 4343795

Bhabha veto is applied.
KMicroNotPionGTL is applied.
FitDprob > 0.01 and FitBprob > 0.01 are applied.
|cosDinonDl| < 0.88 is applied.


A. Lepton miss ID : electron and muon componemts

D0Kpi mode	electron	muon
signal total	51333	45333
non-B	17210	33774
lepton miss ID in non-B	16507	11334
K mis ID	46799	40286
Pi mis ID	12829	8731
K and Pi not from same D	13124	12977
extra K or Pi from same D	7	13
lepton miss ID in D reconstruction	71372	52450
lepton mis ID in B(Dl) reconstruction	46	4854
lepton not direct from B	7457	6634
lepton and D not from same B	7661	6706
background total	105133	113975
Delta_S/S	0.007706	0.008804

There is no big difference of the lepton miss ID ratio between electron and muon. This is mainly because tight selection (MuMicroTight) was applied to muon. But still there is big difference at the "lepton mis ID in Dl reconstruction". This is one of the peaking background coponents.


B. Non-B peaking background

Separeted non-B background into two categories:
    1) Ones including real D (c/cbar -> D + X)
    2) Ones without real D. Mainly uds.

D mass plot (D0->Kpi) : MC components
D mass plot (Dch->Kpipi) : MC components

Numbers in each componemts are here:

numbers (D0->Kpi)
numbers (Dch->Kpipi)


The "non-B without real D" componet is clearly conbinatric/continuum. The peaking background of non-B events are cleanly separated.

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