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ATLAS Offline Software
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ATLAS Offline Software
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This is and Event Data Model package, designed to store the information about reconstructed V0 candidates, such as photon conversions, kaons, lambdas and so.
Trk::V0Hypothesis Inherits from Trk::ExtendedVxCandidate. In addition it contains the assumed PDG ID of the positive and negative tracks, making the V0 and the assumed PDG ID of the V0. Possible V0 hypotheses are: Unconstrained (i.e. no mass or pointing constraints applied in the fit) and the mass constrained hypotheses: Kshort (K_S0 -> pi_plus pi_minus), Lambda (Lambda0 -> p_plus pi_minus), LambdaBar (anti_Lambda0 -> pi_plus anti_p_minus) and Gamma conversion (gamma -> e_plus e_minus).
Trk::V0Candidate Always contains the Unconstrained hypothesis plus one or more mass constrained hypotheses (reconstructed from the same pair of oppositely charged tracks).
V0Container This is a top level object of the TrkV0Vertex package. It represents a collection of Trk::V0Candidate<i>'s reconstructed by a V0 finding algorithm and written to the StoreGate for further use.
1.8.18