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Showing 1 to 20 of 152 for “"Charm"”.
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Towards an old charm
When we build unconsciously and we build as a habit, only then we lose the essence of architecture
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Nonleptonic decays of charm mesons
Amplitude analyses of the $D\sp{+}$, $D\sbsp{s}{+}\ \to\ K\sp{+}K\sp{-}\pi\sp{+}$ and $D\sp{+}$, $D\sbsp{s}{+}\ \to\ \pi\sp{+}\pi\sp{+}\pi\sp{-}$ Dalitz plots are presented using data collected by the Fermilab high energy photoproduction experiment E687. Our data are fit to a model consisting of a …
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Distributed dense linear algebra operations with Charm++
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-12-01
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A node-based approach to charm-FFT
… 3D FFT library was explored. The FFT library, Charm-FFT empowered by Charm++, was redesigned to utilize larger number of nodes while aiming to reduce the number of necessary communications between its components during its computations. Instead of decomposing the input FFT grid into the …
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Production of charm mesons by high energy neutrons
"The charmed mesons D""'±, DO, and D; have been observed in neutron-nucleus collisions at the FNAL Tevatron. A sample of 134 ± 19 events was investigated in the decay D""'±-+ D°1r± with the subsequent decay mode D°-+ K+ K-. The cross section per nucleon for D""'±, at most probable energy ...;s = 35 …
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Spectroscopy of exotic charm mesons from lattice QCD
… exotic mesons has been growing every year in the charm sector and the theoretical understanding of them is often conflicted amongst the community. Some possible explanations include hybrid mesons where the quark-antiquark pair is coupled to a gluonic excitation, compact tetraquarks where four …
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Search For Cp Violation In Singly Cabibbo-Suppressed Charm Decays
… $CP$ violation has not yet been observed in the Charm sector; however, the BaBar experiment now has extremely large data samples of charged D mesons which may have the sensitivity to make such a measurement. The CP asymmetry will be measured by studying the asymmetry of the Dalitz plot for …
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Exotic charm resonances and coupled-channel scattering from lattice QCD
… resonances (unstable hadrons) containing charm quarks, with a focus on exotic hadrons. These are hadrons that cannot be described by simple quark-antiquark or three-quark configurations -- a model that works well for low-energy and stable (under the strong force) hadrons. We investigate …
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Measurement of Open Charm in 158 AGeV/c Pb-Au Collisions
… oberen Grenze für die Produktionsrate von Open Charm Mesonen in 158 AGeV/c Pb-Au Kollisionen mit dem CERES Spektrometer bei einer Zentralität von 7%. Es wird die Entwicklung einer Rekonstruktionsmethode für Sekundärteilchen vorgestellt, die auf der Rekonstruktion des Zerfallsvertex beruht. Die …
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Leistungsmerkmale des HERA-B Vertexdetektors und Suche nach semileptonischen Charm-Zerfällen
… des bbar-Wirkungsquerschnittes und Studien der Charmonium-Produktion vorsieht, wird die Unterdrückung von doppelt semileptonisch zerfallendem offenen Charm (ccbar->mu+mu-) relativ zu direkt produzierten J/Psi-Mesonen (J/Psi->mu+mu-) durch Ereignisfilter und Analyseschnitte bestimmt. Es zeigt …
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Measurements of Charm Meson Production in 10.5 GeV Electron -Positron Annihilations
A study of charm meson production in e+ e- gamma* → cc¯ events at s = 10.5 GeV is presented. Included are measurements of the fragmentation distributions of D+s and D*+s , the vector to pseudoscalar production ratio for Ds, and the D*+ spin alignment. A description of the new trigger …
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Measurements of Charm Meson Production in 10.5 GeV Electron-Positron Annihilations
Submitted by Jesse Garrison (jagarris@illinois.edu) on 2012-01-12T20:39:01Z No. of bitstreams: 1 2000_johnson.pdf: 3447638 bytes, checksum: df5cb10ed87740c1ce63288a2ef68f4b (MD5)
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Beauty meson to double open charm decays with the LHCb detector
Measurements of beauty meson to double open charm decays are presented. These measurements use data collected in proton-proton collisions by the LHCb detector at the Large Hadron Collider (LHC) between 2011 and 2018. Firstly a search for sixteen rare decays of the $B_c^+$ meson to two charm mesons …
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Open and Hidden Charm Mesons at Finite Temperature from Anisotropic Lattice QCD
… its large mass and long thermalisation time, the charm quark is an excellent tool with which to probe the plasma. In this thesis I study the dissociation of open and hidden charm mesons. Lattice QCD provides a non-perturbative means of studying the spectral quantities of charmed mesons. The …
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Determination of the charm- and beauty-quark masses from QCD sum rules
… are used in order to determine the on-shell charm- and beauty-quark masses. After confronting the experimental data in the charmonium and bottonium systems with theory, we obtain mc = 1.46 ± 0.07 GeV and mb = 4.70 ± 0.07 GeV. The error is due to the uncertainties in the values of Λ and the …
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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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