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Title: Measurement of charmed hadron production in e±p deep inelastic scattering with the ZEUS detector
Author: Allfrey, Philip Daniel
ISNI:       0000 0001 3417 6459
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2007
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Charmed hadron production has been studied in 225 pb-1 of data collected with the ZEUS detector in the HERA-II runnning period. Studies were made in the D* → D0π → Kππ decay channel to determine the potential for the microvertex detector to improve charm signals. Integrated cross sections were measured for the decays D0 → K0sπ⁺ π⁻, D± → K0s π±, D±_s → K0s K± and Lambda±_c → Lambda0π± in the kinematic region 5< Q² < 1000 GeV², 0.02 < y < 0.7, 1.5 < pT(D,Lambda_c) < 20.0 GeV, -1.6 < pseudorapidity(D, Lambda_c) < 1.6. The D0 cross section was additionally measured down to pT(D0) > 1.0 GeV. Differential cross sections as a function of Q², x, pT(D) and pseudorapidity(D) were measured for the D0, D±, and D_s± channels. The measurements were compared to next-to-leading order (NLO) QCD calculations, and good agreement found for all variables in all channels over the measured kinematic region. The strangeness-suppression factor, gamma_s = D_s±/(D± + D0), was measured and found to be in good agreement with values previously measured at HERA and elsewhere, and with the DJANGOH and RAPGAP Monte Carlo. The ratio of charmed baryons to mesons, Lambda_c±/(D± + D0), was measured and also found to be in good agreement with Monte Carlo.
Supervisor: Walczak, Roman Sponsor: Commonwealth Scholarship
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Particle physics ; charmed hadron production ; strangeness-suppression factor ; baryon-to-meson ratio