First observation of the Charmless Decay B to K pi0pi0 and Study of its Dalitz Plot Structure Page: 99 of 201
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4.4. Classification of Misreconstructed Events
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
5.22 5.23 5.24 5.25 5.26 5.27 5.28 5.29
mFS(Ge V/c2)0.03
0.025
0.02
0.015
0.01
0.005- .0 s -0.2 -6.1 -01 - 0 0 . 0.15 0.2
AE(GeV)Figure 4.11: mEs (left) and AE (right) distributions for TM (red histogram)
and SCF (blue histogram) events based upon a definition of SCF from ppun >
5.0. Both TM and SCF histograms have been normalised.
to correctly reconstruct therefore the largest fraction of SCF events is found in the
corner of the Dalitz plot where the momentum of one of the 7r0 mesons is very low.
In order to avoid biases from Punzi effect, the Dalitz plot distribution of the SCF
fraction is not directly included in the fit (see Appendix A). The method used
instead determines the SCF fraction in data by an iterative procedure involving
SPlots (see Section 3.4). This procedure is described in detail in the next chapter
in Section 5.4 and uses the square DP in Figure 4.12 to calculate the SCF fraction.
A summary of average SCF fractions in MC is listed in Table 4.3 and the large
variation is evident (higher for low mass K* and broad r 7r resonances).4
2
0
8
6 *
4"
20 5 10 15 20 25
m20,0 (GeV2/c4)1 m 0.5
0.45
0.4
10- 0.35
0.3
0.25
0.2
10-2 0.15
0.1
-3 00 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
m'Figure 4.12: Fraction of self cross feed events as a function of Dalitz plot
position in conventional (left) and square (right) Dalitz plot form.
70C7
o
01
10-I
10-27 ,,,--
-- --70
1
1
15 10
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Puccio, Eugenia Maria Teresa Irene & /SLAC, /Warwick U. First observation of the Charmless Decay B to K pi0pi0 and Study of its Dalitz Plot Structure, thesis or dissertation, March 21, 2012; United States. (https://digital.library.unt.edu/ark:/67531/metadc830373/m1/99/?q=%22Irene%22: accessed June 8, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.