B2DK < LHCb < TWiki

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---+!! B<sup>-</sup> to D<sup>0</sup> (K pi) K<sup>-</sup>

%TOC%

---++ 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

<verbatim>#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
</verbatim>

no MC study was done with this deacy 

---+++ Analysis Script

   * [[%ATTACHURL%/BachelorAnalsys.C.exe][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: <br /> <img width="696" alt="b2dk-600nb-bm.png" src="/twiki/pub/LHCb/B2DK/b2dk-600nb-bm.png" height="472" />

   * B2DK D mass plot with 600/nb of real data: <br /> <img width="696" alt="b2dk-600nb-dm.png" src="/twiki/pub/LHCb/B2DK/b2dk-600nb-dm.png" height="472" />

-- Main.ThomasBird - 2010-09-07

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
exe	BachelorAnalsys.C.exe	r1	manage	115.4 K	2010-09-07 - 15:19	ThomasBird	slightly altered B2Dpi script to work with B2Dk
png	b2dk-600nb-bm.png	r1	manage	17.8 K	2010-09-07 - 15:15	ThomasBird	B2DK B mass plot with 600/nb of real data
png	b2dk-600nb-dm.png	r1	manage	19.9 K	2010-09-07 - 15:15	ThomasBird	B2DK D mass plot with 600/nb of real data

Topic revision: r2 - 2010-11-05 - StefaniaRicciardi