Abstract
Abstract Charm production in deep inelastic ep scattering was measured with the ZEUS detector using an integrated luminosity of 354 pb−1. Charm quarks were identified by reconstructing D ± mesons in the D ± → K ∓π±π± decay channel. Lifetime information was used to reduce combinatorial background substantially. Differential cross sections were measured in the kinematic region 5 < Q 2 < 1000 GeV2, 0.02 < y < 0.7, 1.5 < p T (D ±) < 15 GeV and |η(D ±)| < 1.6, where Q 2 is the photon virtuality, y is the inelasticity, and p T (D ±) and η(D ±) are the transverse momentum and the pseudorapidity of the D ± meson, respectively. Next-to-leading-order QCD predictions are compared to the data. The charm contribution, $ F_2^{{c\overline{c}}} $ , to the proton structure-function F 2 was extracted.
Highlights
In the analysis presented here, a charm quark in the final state was identified by the presence of a D+ meson,1 using the D+ → K−π+π+ decay
Differential cross sections were measured in the kinematic region 5 < Q2 < 1000 GeV2, 0.02 < y < 0.7, 1.5 < pT (D±) < 15 GeV and |η(D±)| < 1.6, where Q2 is the photon virtuality, y is the inelasticity, and pT (D±) and η(D±) are the transverse momentum and the pseudorapidity of the D± meson, respectively
In the kinematic range of the analysis, charged particles were tracked in the central tracking detector (CTD) [16] and the microvertex detector (MVD) [19]
Summary
In the kinematic range of the analysis, charged particles were tracked in the central tracking detector (CTD) [16] and the microvertex detector (MVD) [19]. These components operated in a magnetic field of 1.43 T provided by a thin superconducting solenoid. The transverse distance of closest approach (DCA) of tracks to the nominal vertex in XY was measured to have a resolution, averaged over the azimuthal angle, of (46 ⊕ 122/pT ) μm, with pT in GeV. The high-resolution uranium-scintillator calorimeter (CAL) [20] consisted of three parts: the forward (FCAL), the barrel (BCAL) and the rear (RCAL) calorimeters. The fractional systematic uncertainty on the measured luminosity was 1.9%
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