Using Neural Networks to Identify
نویسنده
چکیده
A neural network method for identifying the ancestor of a hadron jet is presented. The idea is to nd an eecient mapping between certain observed hadronic kinematical variables and the quark/gluon identity. This is done with a neuronic expansion in terms of a network of sigmoidal functions using a gradient descent procedure, where the errors are back-propagated through the network. With this method we are able to separate gluon from quark jets originating from Monte Carlo generated e + e ? events with 85% accuracy. The result is independent on the MC model used. This approach for isolating the gluon jet is then used to study the so-called string eeect. In addition, heavy quarks (b and c) in e + e ? reactions can be identiied on the 50% level by just observing the hadrons. In particular we are able to separate b-quarks with an eeciency and purity, which is comparable with what is expected from vertex detectors. We also speculate on how the neural network method can be used to disentangle diierent hadronization schemes by compressing the dimensionality of the state space of hadrons. 1 thepll@seldc52 (bitnet) [email protected] (internet) 2 thepcap@seldc52 (bitnet) [email protected] (internet) 3 thepdr@seldc52 (bitnet) [email protected] (internet)
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