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Persistent URL http://purl.org/net/epubs/work/29688
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Record Id 29688
Title The First Measure of Relative Partonic Contributions in DIS at HERA using an Average Hadronic Charge
Abstract High Energy Deep Inelastic Scattering events at the H1 detector at the HERA collider are used for analysis in the current region of the Briet frame. The analysis is concerned with extracting a correlation between the hadrons produced by the fragmentation of a struck parton in DIS events and with that struck parton-gauss charge. We define a fragmentation variable, xp = 2ph/Q, where Q is the four-momentum transfer between the lepton and the struck quark, and ph is the momentum that a hadron, h, possesses. The hadronic tracks are weighted according to their momenta, so that more energetic tracks have a bigger weight. The entire data-sample is normalised by an average weight. We further define a variable Cj, to be a normalised momentum-weighted charge sum of the whole hadronic system for a given event. The Cj distributions show nodal structure at points corresponding to net charges of -1,0,+1. To emphasise this behaviour, we take the ratio of the distribution-gauss mean to its standard deviation, and maximise it with respect to an initiating quark. The method outlined in this analysis may be used to provide a statistical method of decomposing proton structure functions into partonic structure functions. Consistency checks on this method are also presented in this thesis. The method-gauss reliability was high, and was robust under all performed tests. Further analysis using the Mandelstam variable s(circumflex) i.e. the invariant centre-of-mass energy of the hard sub-process, was performed in the hope that it would provide information about the difference kinematics used in the various Monte Carlo simulations to model some classes of physics events e.g. Boson-Gluon Fusion, QCD-Compton. Splitting the sample into two sub-groups (one with high s(circumflex), where we are clearly in the perturbative QCD region; the other low s(circumflex)) provided no further information than already obtained in an inclusive treatment. An investigation of events having different classes of Cj = 0.0 also provided no additional information. The method described in this thesis can be used to extract the relative partonic contributions in DIS at HERA and the results obtained are presented.
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Language English (EN)
Type Details URI(s) Local file(s) Year
Thesis RAL Theses RAL-TH-1998-018. 1998. 1998