Tigher K Selection                                                                        Kenji Hamano

Last modified : Dec 09, 2005                                              Back to Home Back to privious page

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The following requirements were missing (loosened) in BToDlnu skims
1. Kaon to produce D0 list
   KMicroNotPion was used as a imput list of kaon, but it was loosened to GTL in skim.
   Note that KMicroNotPionGTL was used to produce Dch.
2. D vertex condition
   Daughters of D (a kaon and a few Pions) come from a point.
3. p*D cut
   D momentum in the CM frame satisfies, 0.5 < p*D < 2.5 GeV

Run3 was used. MC luminosity is 30 fb-1.
Bhabha veto is applied.

KMicroNotPionGTL and KMicroLoose were tested

D0 mass : K list = GTL
Dch mass : K list = GTL
D0 mass : K list = KMicroNotPionGTL
Dch mass : K list = KMicroNotPionGTL
D0 mass : K list = KMicroLoose
Dch mass : K list = KMicroLoose

A. D0Kpi

D0 mass (D0->Kpi) : MC components : K list = GTL
   D0 mass = 1.864 +- 0.01188 from signal plot
D0 mass (D0->Kpi) : MC components : K list = KMicroNotPionGTL
   D0 mass = 1.864 +- 0.01063 from signal plot
D0 mass (D0->Kpi) : MC components : K list = KMicroLoose
   D0 mass = 1.864 +- 0.01086 from signal plot

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
K list = GTL case:
   nSig = 141247, nBkg = 1179211, Delta_S/S = 0.008135
K list = KMicroNotPion case:
   nSig = 132576, nBkg = 695544, Delta_S/S = 0.006864
K list = KMicroLoose case:
   nSig = 124441, nBkg = 516098, Delta_S/S = 0.006431

Detailed number of candidates
nDl plots : K list = original
nDl plots : K list = KMicroNotPionGTL
nDl plots : K list = KMicroLoose

	original		KMicroNotPionGTL		KMicroLoose
	Peak	Sideband	Peak	Sideband	Peak	Sideband
Bp->Dlnu	19543	977	18315	639	17325	666
Bp->D*lnu	55847	2752	52397	1876	49159	1907
Bp->D0**lnu	521	31	491	21	458	19
Bp->D1**lnu	3594	172	3416	120	3236	116
Bp->D1H**lnu	2301	104	2174	68	2034	66
Bp->D2**lnu	1372	73	1301	50	1219	55
Bp->DPilnu	2357	119	2197	78	2009	72
Bp->D*Pilnu	1586	76	1503	51	1417	53
B0->D*lnu	37693	1956	35336	1303	33159	1323
B0->D0**lnu	1048	54	982	34	906	33
B0->D1**lnu	4073	210	3877	140	3645	146
B0->D1H**lnu	2616	135	2451	83	2316	95
B0->D2**lnu	2145	96	2017	62	1895	59
B0->DPilnu	4736	282	4399	194	4070	192
B0->D*Pilnu	1815	66	1720	48	1593	44
signal total	141247	7103	132576	4767	124441	4846
non-B	573441	546642	341751	315245	245435	219730
lepton mis ID	51309	43347	32336	24700	25124	17885
lepton not direct from B	140743	117046	85098	61912	66270	44756
lepton and D not from same B	413718	390141	236359	213547	179269	157544
background total	1179211	1097176	695544	615404	516098	439915
Delta_S/S	0.008135		0.006864		0.006431

B. DchKpipi

Dch mass (Dch->Kpipi) : MC components : K list = GTL
   Dch mass = 1.869 +- 0.01595 from signal plot
Dch mass (Dch->Kpipi) : MC components : K list = KMicroNotPionGTL
   Dch mass = 1.869 +- 0.01601 from signal plot
Dch mass (Dch->Kpipi) : MC components : K list = KMicroLoose
   Dch mass = 1.869 +- 0.01589 from signal plot

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
K list = original (KMicroNotPionGTL?) case:
   nSig = 80135, nBkg = 785149, Delta_S/S = 0.011608
K list = KMicroNotPionGTL case:
   nSig = 87745, nBkg = 1574017, Delta_S/S = 0.014691
K list = KMicroLoose case:
   nSig = 81369, nBkg = 1291929, Delta_S/S = 0.014402

Detailed number of candidates
nDl plots : K list = original
nDl plots : K list = KMicroNotPionGTL
nDl plots : K list = KMicroLoose

	original		KMicroNotPionGTL		KMicroLoose
	Peak	Sideband	Peak	Sideband	Peak	Sideband
Bp->D0**lnu	1845	195	1837	194	1680	184
Bp->D1**lnu	1620	191	1661	199	1551	177
Bp->D1H**lnu	969	104	993	108	903	103
Bp->D2**lnu	2630	314	2612	320	2477	284
Bp->DPilnu	7657	859	7652	865	7074	790
Bp->D*Pilnu	637	62	667	66	640	60
B0->Dlnu	35557	3385	34906	3360	32374	3058
B0->D*lnu	29896	3092	29808	3111	27586	2801
B0->D0**lnu	865	75	849	77	789	70
B0->D1**lnu	781	67	790	74	745	71
B0->D1H**lnu	527	44	551	47	502	36
B0->D2**lnu	1340	142	1321	137	1248	115
B0->DPilnu	3786	434	3764	434	3493	382
B0->D*Pilnu	330	34	334	31	307	33
signal total	88440	8998	87745	9023	81369	8164
non-B	557007	534235	527210	504942	404905	384820
lepton mis ID	82101	75513	84283	77607	71116	64663
lepton not direct from B	214045	195420	215558	196264	183594	165657
lepton and D not from same B	764387	744383	746966	726492	632314	612939
background total	1617540	1549551	1574017	1505305	1291929	1228079
Delta_S/S	0.014769		0.014691		0.014402

Coclusion

Use KMicroNotPionGTL
because there is no big difference between KMicroNotPionGTL and KMicroLoose, applying two similar K selector is rather confusing.

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Tried KMicroTight selection
All selection applied

D mass (D0Kpi)
Numbers
D mass (DchKpipi)
Numbers
D momentum plots (D mass sideband subtracted)

Does not do much good.

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