D reconstruction                                                                        Kenji Hamano

Last modified : Aug 22, 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

I applied only KMicroNotPion requrement to suppress background

Run4 was used. Luminosities are approximately 25 fb-1
Bhabha veto is applied.


1. BToDlnu skims

D mass : K list = GTL
D mass : K list = KMicroNotPion

A. D0Kpi

D0 mass (D0->Kpi) : MC components
D0 mass (D0->Kpi) : MC components - B and Other separated

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

Only D mass peak region: 1.845 GeV < D mass < 1.885 GeV
K list = GTL case:
   nSig = 507553, nBkg = 747267, Delta_S/S = 2.2e-3
K list = KMicroNotPion case:
   nSig = 378510, nBkg = 519317, Delta_S/S = 2.5e-3

Tighter D mass peak region: 1.855 GeV < D mass < 1.875 GeV
K list = GTL case:
   nSig = 322267, nBkg = 408744, Delta_S/S = 2.653e-3
K list = KMicroNotPion case:
   nSig = 254931, nBkg = 293909, Delta_S/S = 2.906e-3

B. DchKpipi

Dch mass (Dch->Kpipi) : MC components - B and Other separated

Fractional uncertainty of signal

Only D mass peak region: 1.849 < D mass < 1.889
K list = KMicroNotPionGTL case:
   nSig = 806650, nBkg = 864924, Delta_S/S = 1.603e-3
K list = KMicroNotPionGTL + KMicroNotPion case:
   nSig = 805798, nBkg = 871547, Delta_S/S = 1.607e-3

Tighter D mass peak region: 1.859 < D mass < 1.879
K list = KMicroNotPionGTL case:
   nSig = 446023, nBkg = 459368, Delta_S/S = 2.133e-3
K list = KMicroNotPionGTL + KMicroNotPion case:
   nSig = 448767, nBkg = 464479, Delta_S/S = 2.129e-3


2. AddLepton subskims

A. D0Kpi

No tag-lepton momemtum cut
D0 mass (D0->Kpi) : K list = GTL
D0 mass (D0->Kpi) : K list = KMicroNotPion
Tag-lepton momemtum cut dependence
D0 mass (D0->Kpi) P_lep cut dependence : K list = GTL
D0 mass (D0->Kpi) P_lep cut dependence : K list = KMicroNotPion

Fractional uncertainty of signal

Only D mass peak region: 1.849 < D mass < 1.889
K list = GTL case:
   nSig = , nBkg = , Delta_S/S =
K list = KMicroNotPion case:
   nSig = 144017, nBkg = 181401, Delta_S/S = 3.961e-3

Tighter D mass peak region: 1.855 GeV < D mass < 1.875 GeV
K list = GTL case:
   nSig = , nBkg = , Delta_S/S = e-3
K list = KMicroNotPion case:
   nSig = 95322, nBkg = 101350, Delta_S/S = 4.65241e-3

B. DchKpipi

Tighter D mass peak region: 1.859 < D mass < 1.879
K list = KMicroNotPionGTL case:
   nSig = , nBkg = , Delta_S/S = e-3
K list = KMicroNotPionGTL + KMicroNotPion case:
   nSig = 158001, nBkg = 165098, Delta_S/S = 3.59756e-3

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