Vertexing and TreeFitter                                                                        Kenji Hamano

Last modified : Oct 10, 2005                                              Back to Home Back to privious page

---

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.


D0 mass : no vertexing
Dch mass : no vertexing
D0 mass : D and B vertexing
Dch mass : D and B vertexing

A. D0Kpi

D0 mass (D0->Kpi) : MC components : no vertexing
D0 mass (D0->Kpi) : MC components : D vertexed
D0 mass (D0->Kpi) : MC components : D and B vertexed

Fractional uncertainty of signal
   Delta_S / S = sqrt[(nSig + nBkg + rho*rho*nBkg*nBkg)] / (nSig)
Setting rho = 0

D mass peak region : 1.864 +- 0.024 : 1.840 GeV < D mass < 1.888 GeV
D mass side band : 1.816 GeV < D mass < 1.864 GeV and 1.888 GeV < D mass < 1.912 GeV
No vertexing:
   nSig = 133504, nBkg = 704230, Delta_S/S = 0.006856
D vertexed:
   nSig = 130404 (97.68 %), nBkg = 591694 (84.02 %), Delta_S/S = 0.006516
D and B vertexed:
   nSig = 128343 (96.13 %), nBkg = 512199 (72.73 %), Delta_S/S = 0.006236

Detailed number of candidates
nDl plots : no vertexing
nDl plots : D vertexed
nDl plots : B and D vertexed

	no vertexing		D vertexed		D and B vertexed
	Peak	Sideband	Peak	Sideband	Peak	Sideband
Bp->Dlnu	18364	639	17949	505	17643	464
Bp->D*lnu	52772	1888	51564	1466	50753	1310
Bp->D0**lnu	492	21	483	17	478	15
Bp->D1**lnu	3457	123	3366	100	3317	92
Bp->D1H**lnu	2199	69	2153	49	2114	42
Bp->D2**lnu	1317	53	1286	40	1261	38
Bp->DPilnu	2211	79	2165	55	2136	50
Bp->D*Pilnu	1521	51	1485	34	1468	29
B0->D*lnu	35566	1318	34724	1050	34149	947
B0->D0**lnu	991	34	956	24	945	21
B0->D1**lnu	3922	141	3825	113	3779	102
B0->D1H**lnu	2488	84	2430	67	2384	59
B0->D2**lnu	2032	62	1989	44	1963	38
B0->DPilnu	4429	196	4332	152	4277	139
B0->D*Pilnu	1743	48	1697	39	1676	36
signal total	133504	4804 (3.59 %)	130404	3755 (2.88 %)	128343	3382 (2.64 %)
non-B	343585	317131	282218	255932	236896	213163
lepton mis ID	33961	26012	29595	21567	25898	18740
lepton not direct from B	87802	64021	76523	53058	66283	45635
lepton and D not from same B	23880	215765	203358	180721	183122	162773
wrong D decay mode	1	0	0	0	0	0
Pi mis ID	0	0	0	0	0	0
K and Pi not from same D	1	0	0	0	0	0
background total	704230	622931 (88.46 %)	591694	511278 (86.41 %)	512199	440311 (85.96 %)
Delta_S/S	0.006856		0.006516		0.006236

B. DchKpipi

Dch mass (Dch->Kpipi) : MC components : no vertexing
Dch mass (Dch->Kpipi) : MC components : D vertexed
Dch mass (Dch->Kpipi) : MC components : D and B vertexed

Fractional uncertainty of signal

Only D mass peak region : 1.869 +- 0.024 : 1.845 < D mass < 1.893
D mass side band : 1.821 GeV < D mass < 1.845 GeV and 1.893 GeV < D mass < 1.917 GeV
No vertexing:
   nSig = 84573, nBkg = 1657538, Delta_S/S = 0.015607
D vertexed:
   nSig = 79162 (93.60 %), nBkg = 1094643 (66.04 %), Delta_S/S = 0.013686
D and B vertexed:
   nSig = 78232 (92.50 %), nBkg = 994293 (60.00 %), Delta_S/S = 0.013238

Detailed number of candidates
nDl plots : no vertexing
nDl plots : D vertexed
nDl plots : D and B vertexed

	no vertexing		D vertexed		D and B vertexed
	Peak	Sideband	Peak	Sideband	Peak	Sideband
Bp->D0**lnu	1752	84	1619	54	1596	53
Bp->D1**lnu	1646	81	1545	54	1524	54
Bp->D1H**lnu	991	43	933	26	919	25
Bp->D2**lnu	2525	121	2356	85	2340	85
Bp->DPilnu	7314	355	6814	223	6762	218
Bp->D*Pilnu	665	21	627	17	619	17
B0->Dlnu	33418	1582	31373	1022	30970	1002
B0->D*lnu	28919	1458	27025	889	26710	866
B0->D0**lnu	818	38	772	24	762	23
B0->D1**lnu	768	41	727	26	719	24
B0->D1H**lnu	543	25	506	11	498	11
B0->D2**lnu	1259	56	1182	39	1169	37
B0->DPilnu	3631	207	3390	133	3352	132
B0->D*Pilnu	324	13	293	7	292	7
signal total	84573	4125 (4.88 %)	79162	2610 (3.30 %)	78232	2554 (3.26 %)
non-B	536425	514102	340945	319093	297925	278087
lepton mis ID	97134	89933	65043	58356	58799	52757
lepton not direct from B	238302	217677	161240	141694	144342	126816
lepton and D not from same B	780631	759325	523856	501766	489843	471720
wrong D decay mode	391	361	270	253	256	233
Pi mis ID	0	0	0	0	0	0
K Pi not from same D	4655	4768	3289	3280	3128	3129
background total	1657538	1586166 (95.69 %)	1094643	1024442 (93.59 %)	994293	932742 (93.81 %)
Delta_S/S	0.015607		0.013686		0.013238

Get optimum cut

A. D0Kpi

	no cut	D prob > 0.1	0.01	0.001	0.0001
no cut	0.006856			0.006516
B prob > 0.1				0.006220
0.01		0.006357	0.006169	0.006165	0.006165
0.001			0.006232	0.006236	0.006240
0.0001				0.006283

B. DchKpipi

	no cut	D prob > 0.1	0.01	0.001	0.0001
no cut	0.015607			0.013686
B prob > 0.1				0.012825
0.01			0.012979	0.012997	0.012997
0.001			0.013133	0.013238	0.013260
0.0001				0.013349

Coclusion

  Use cuts "FitDprob > 0.01" and "FitBprob > 0.01".

A. D0Kpi
D0 mass (D0->Kpi) : MC components
Numbers of each category
nDl plots

B. D0K3pi
D0 mass (D0->K3pi) : MC components
Numbers of each category
nDl plots

C. D0Kpipi0
D0 mass (D0->Kpipi0) : MC components
Numbers of each category
nDl plots

D. D0Kspipi
D0 mass (D0->Kspipi) : MC components
Numbers of each category
nDl plots

E. DchKpipi
D0 mass (Dch->Kpipi) : MC components
Numbers of each category
nDl plots

F. DchKspi
D0 mass (Dch->Kspi) : MC components
Numbers of each category
nDl plots

---