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T: Fachverband Teilchenphysik

T 211: Schwere Quarks I

T 211.7: Vortrag

Dienstag, 6. März 2007, 18:15–18:30, INF 327 SR 1

Double tagging of heavy quarks with a D* and a muon at HERA — •Angela Lucaci-Timoce — DESY FH1, Notkestr. 85, 22607 Hamburg

Heavy quark production is investigated in the H1 experiment at the HERA collider in DESY, Hamburg. Photoproduction events with Q²<1  GeV² are selected, in which the electron is scattered at small angles. The heavy quarks are tagged by reconstructing a D^* meson with p_t≥ 1.5 GeV in the central region of the detector: |η(D^*)| < 1.5, in the decay channel D^*→ Kππ_s. Additional information is obtained by detecting also a muon coming from the decay of heavy hadrons.

Charge and azimuthal angle correlations between the D^* and the muon are used to determine the charm and beauty contributions to the data. Kinematic variables of the D^*µ system (transverse momentum p_t(D^*µ), pseudorapidity η(D^*µ), rapidity y(D^*µ) and azimuthal angle Δφ(D^*µ)) are defined as an approximation of the heavy quark pair variables. The mean D^*µ transverse momentum seems to be sensitive to different QCD evolution equations: DGLAP, implemented in Pythia Monte Carlo, and CCFM, in Cascade.

Results obtained from the 226 pb⁻¹ data from the HERA I and II run periods will be presented.