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Showing 1 to 10 of 10 for “"Charm Quarks"”.
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Untersuchung der Produktion charmhaltiger Mesonen in der Photon-Photon-Streuung mit dem OPAL-Experiment
Die Produktion von Charm-Quarks in der Photon-Photon-Streuung wird ueber <br>den Nachweis charmhaltiger Mesonen untersucht. Die Arbeit basiert <br>auf den Daten, die mit dem OPAL-Detektor am <br>Elektron-Positron-Speicherring LEP am CERN in Genf in den Jahren <br>von 1989 bis 1998 aufgenommen …
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Measurement of the D*+- cross-section at HERMES
In this thesis, the production of charm quarks in lepton-nucleon scattering has been investigated. Open charm events are identified through the detection of D^{*+/-} mesons which are produced in the fragmentation of charm quarks. The D^{*+/-} mesons are reconstructed in the decay chain D^{*+} o D^0 …
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A next-to-leading-order calculation of proton-proton(proton-antiproton) to two jets, at least one of which contains a charm quark
… of two jets, at least one of which contains a charm quark, which is an important background to single-top production. I discuss the leading order results and their scale dependence before outlining the difficulties of an NLO calculation, and the need for treating the charm quarks as massive in …
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A measurement of the relative decay rate of the charm quark into leptons
The inclusive rate of leptons produced from charmed particle decays (from Z -> charm anticharm) has been measured using a data sample of four million hgadronic Z decays recorded by the ALEPH experiment at LEP from 1991 to 1995. The analysis uses a double-tag and is self-calibrating, i.e. it makes …
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D meson reconstruction at star using the silicon vertex tracker (svt)
… partonic matter, called the Quark-Gluon Plasma. Charm quarks are expected to be produced predominately from the initial gluon fusion in parton-parton hard scatterings. This indicates that the production of the charm occurs at the early stages of the collision. At this time the system is thought …
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Charmonium correlation and spectral functions in quenched lattice QCD at finite temperature
… thesis, we have investigated the properties of charmonium states at finite temperature in quenched QCD on isotropic lattices. The standard Wilson plaquette action for the gauge field and the non-perturbatively $cO(a)$ improved clover fermion action for charm quarks are implemented in the …
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Thomas Fermi model for mesons and new noise subtraction techniques in lattice QCD.
… energies are derived. We find that, on average, quarks only interact with antiquarks in such systems. The TF differential equation is constructed and systems with heavy-light quark content are examined. Three types of mesonic systems are defined. In the case of charm quarks, multi-charmonium, …
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Search for and studies of Quark-Gluon Plasma via dynamics and productions of heavy quarks in proton-proton and heavy ion collisions at the LHC with CMS detector
Heavy flavor quarks are sensitive to both the initial stage conditions and the subsequent in-medium evolution of nuclear collisions, and thus can provide insights to the inner workings of Quark-Gluon Plasma (QGP) in large ion collisions and the origin of the collectivity in small systems. In this …
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Analysis of Neutral D Meson Two-Body Decays to a Neutral Kaon and a Neutral Pion
Decays of neutral D mesons to final states containing K + π's could provide evidence for CP-violation from a source not accounted for in the Standard Model. Due to the interference between Cabibbo-favored and Cabibbo-suppressed transitions, a decay rate asymmetry of D0 → K0S π0 compared to D0 → …
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Exotic charm resonances and coupled-channel scattering from lattice QCD
… at low energies. The strong coupling between quarks and gluons gives rise to incredibly important phenomena, most notably the confining of quarks and gluons into composite states called hadrons, of which the proton and neutron are two examples amongst many. However, this strong coupling also …