B^- to D⁰ (K pi) K^-

Current status

ntuple

the ntuple is the same as the B2Dpi one, see that page for info, but its at /opt/ppd/lhcb/tbird/ntuples/B2Dpi/str09-merged-data/B2Dpi_str09.root

Cuts

zero was found to bes the best pid cut

#define Name_Of_Cuts  "thomas mod - low mv and dipchi2 with 0 bac pid"

#define Negative_D_Daughter_PT_Cut               300
#define Positive_D_Daughter_PT_Cut               300
#define Negative_D_Daughter_MINIPCHI2_Cut        9
#define Positive_D_Daughter_MINIPCHI2_Cut        9
#define Negative_D_Daughter_P_Cut                2000
#define Positive_D_Daughter_P_Cut                2000
#define Negative_D_Daughter_TRACK_CHI2NDOF_Cut   8
#define Positive_D_Daughter_TRACK_CHI2NDOF_Cut   8

#define Bachelor_PT_Cut                          300
#define Bachelor_MINIPCHI2_Cut                   9
#define Bachelor_P_Cut                           2000
#define Bachelor_TRACK_CHI2NDOF_Cut              8
#define Bachelor_PIDK_Cut                        0

#define D_FDCHI2_OWNPV_Cut                       100
#define Z_Dist_Cut                               -1
#define D_ENDVERTEX_CHI2_D_ENDVERTEX_NDOF_Cut    15
#define D_IPCHI2_OWNPV_Cut                       9
#define D_PT_Cut                                 2000

#define B_FDCHI2_OWNPV_Cut                       64
#define B_ENDVERTEX_CHI2_B_ENDVERTEX_NDOF_Cut    10
#define B_IPCHI2_OWNPV_Cut                       16
#define B_DIRA_OWNPV_Cut                         0.9999

#define Negative_D_Daughter_PIDK_211_Cut         10
#define Positive_D_Daughter_PIDK_211_Cut         10
#define Positive_D_Daughter_PIDK_321_Cut         10
#define Negative_D_Daughter_PIDK_321_Cut         10

#define D_M_Window_Cut                           21

#define B_M_Window_Cut                           50

no MC study was done with this deacy

Analysis Script

• BachelorAnalsys.C.exe: slightly altered B2Dpi script to work with B2Dk

plots - numbers are wrong

based on graphs made in /opt/ppd/lhcb/tbird/analysis/b2dk/data

The number are wrong on the below graphs the real numbers are in the output.txt file and the output of the lhcb-graph-... script when it runs. this is 600/nb of data.

• B2DK B mass plot with 600/nb of real data:
  

• B2DK D mass plot with 600/nb of real data:
  

-- ThomasBird - 2010-09-07