Analysis of D0 -> K+ pi- pi0 Decays: Search for D0-D0bar Mixing, and Measurements of the Doubly Cabibbo-Suppressed Decay Rate and Resonance Contributions Page: 64 of 187
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Table 4.3: Definitions of reskim variables
p7o The 7r0 lab-momentum magnitude
p(x2) The x2 probability of the fit to the entire decay chain: D*+ -> D07r
(common vertex constrained to be at the measured beamspot), D0 -
K7rgr0 (common vertex for the tracks), 7r0 -- y (7r0 mass con-
strained to the PDG value).* 2.4 GeV/c < p* (see Figure 4.5)
* 0.139 < Am < 0.155 GeV/c2 (value is obtained from the full decay chain fit)
After the above selection criteria have been applied, often there remain two or
more candidates in an event. Those candidates that have a track or cluster in com-
mon are referred to as overlapping candidates. The following checks are applied to
overlapping candidates in an event to select a single candidate.
1. If two 7r0 candidates share a y, the 7r0 in the decay with the higher p(x2) value
is selected. Approximately 5% of events exhibit this.
2. If two D0 candidates share a 7r, the D0 in the decay with the higher p(x2) value
is selected. Approximately 2% of events exhibit this.
3. Consider two D*+ candidates reconstructed as follows:
D*+- D07, D0 - K 7r r0
D*+ D07 , D0 - K rT r0
47
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Wilson, Michael Galante. Analysis of D0 -> K+ pi- pi0 Decays: Search for D0-D0bar Mixing, and Measurements of the Doubly Cabibbo-Suppressed Decay Rate and Resonance Contributions, report, December 13, 2005; [Menlo Park, California]. (https://digital.library.unt.edu/ark:/67531/metadc878913/m1/64/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.