First observation of the Charmless Decay B to K pi0pi0 and Study of its Dalitz Plot Structure Page: 93 of 201
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4.3. Selection Optimisation
4.3.2 Vetoed Regions
In order to reduce contamination from B-background modes, vetoes are used against
certain regions of the Dalitz plot. If any candidate in the event falls in the vetoed
region then the entire event is rejected. In this analysis only one veto is applied for
the decay mode B+ -> KoK+ Ko - 7r0 r0. The r Or invariant mass distribution
in this mode is shown in Figure 4.7. The veto is applied to the region 0.4 GeV/c2 <
mfloxo < 0.55 GeV/c2. Relative efficiencies of applying the K veto for each signal
MC mode are shown in Table 4.3 at the end of this chapter.
800
600
400
200
0 0.3 0.4 0.5 0.6 0.7
Figure 4.7: w0 r invariant mass distribution in B+ -> KoK+ Ko -> o,
Monte Carlo before the veto is applied. The arrows indicate the vetoed region.
4.3.3 Signal Efficiency
A summary of the cuts and their efficiencies is given in Table 4.2 for the nonresonant
and K*(892)+ resonance MC. It is observed that the main differences in efficiency
occur for the selections on the neutral pions' angular distributions and masses.
These differences in efficiency are expected to be even larger with resonances like
the fo(980), which decay to two neutral pions.
Nonresonant MC events are used to study the variation in signal efficiency over the
Dalitz plot. The MC events were generated with a phase space distribution and re-64
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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/m1/93/?q=%22Irene%22: accessed June 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.