😀😄🧑💻😺
basf2 version: release-06-01-12
2023.8
- use git to manager my analysis files
- add flavor tag
- study the correlation between variables
2023.9
- give a brief report on charmless group
- generate more signal MC sample
- toy 2d fit
- fit to data and get branching fraction
- Amplitude analysis
Time | Description |
---|---|
2023 | The first month to log |
The distribution of different variables
- kaon selection
- kaonID>0.2
-
$\pi^0$ selection- gamma
- clusterNHits > 1.5 and 0.2967 < clusterTheta < 2.6180
- gamma in different range:
- clusterReg=1: E>0.1 GeV
- clusterReg=2: E>0.06 GeV
- clusterReg=3: E>0.1 GeV
- cluster shape: cluseterE9E21>0.9
-
$\pi^0$ - the mass window used now:
$0.111 \lt M_{\pi_{0}} \lt 0.153 \rm~GeV/c^2$ , invariant mass between m_mean +- 3sigma. $|\cos\theta_{helicity}|<0.95$
- the mass window used now:
- gamma
-
$B^0$ - vertex fit
- delta E
- Mbc
We used two variables to select the best
-
$\pi^0$ mass constrained chi2 - chiProb of
$B^0$ vertex fit chi2
Selection strategy:
- Firstly, we select the
$B^0$ candidate whose$\pi^0$ with lowest chi2. - If there are still multi
$B^0$ candidate, we select the$B^0$ candidate with higher chiProb.
MC sample: MC 15 run-indepent qqbar sample
We used FBDT to do continuum suppression, which is introduced in the basf2 website.
We used the MVA package in basf2 to mix signal and background sample, and evaluate the result of training.
The cut of continuum suppression output:
To do fit process, transform this variable:
We also used the method indroduced in basf2 sofeware website
We add a cut on the output of flavor tag:
Following the note from belle, we will remove the background from D meson decay, and do the fit.
But in the B2Kpipi0 analysis of BARBAR experiment, they do not remove the background from D, and considered this source of background in amplitude fit.
cut | sigMC efficiency/% | SCF/% | Background number ( |
---|---|---|---|
fundemental | 35.70 | 8.76 | |
continuum suppression | 30.97 | 6.72 | |
charm veto | 29.93 | 6.84 | |
flavor tag | 29.72 | 6.85 |
Component | Correlation factor |
---|---|
Truth-matched signal | -0.51% |
SCF signal | -0.10% |
Continuum |
0.99% |
Generic B sample | -1.66% |
peaking from B sample | 0.88% |
Component | ||
---|---|---|
Truth-matched signal | -0.51% | |
SCF signal | -0.10% | |
Continuum |
0.99% | |
Generic B sample | -1.66% | |
peaking from B sample | 0.88% |