Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"Neutralino"”.
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Higher order and CP-violating effects in the neutralino and Higgs boson sectors of the MSSM
Complete one-loop results are presented for neutralino and Higgs decay processes of the form chi^0_i->chi^0_j h_a and h_a->chi^0_i chi^0_j in the MSSM with CP-violating parameters. An on-shell renormalisation scheme is developed for the chargino–neutralino sector that consistently takes into …
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Improvements in Upper Limits of the Neutralino-Proton Cross Section through use of Model-Independent Nuclear Form Factors.
Theoretical calculations of neutralino cross sections with various nuclei are of great interest to direct dark matter searches such as CDMS, EDELWEISS, ZEPLIN, and other experiments. These cross sections and direct detection rates are generally computed with standard, one or two parameter …
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Phenomenological aspects of the E6SSM
… the E6SSM with a particular focus on the inert neutralino sector of the model and on the dark matter implications. The E6SSM is a string theory inspired supersymmetric extension to the Standard Model with an E6 grand unification group. The model provides a solution to the hierarchy problem of …
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A search for Z = -1 dark matter annihilation products in cosmic rays with AMS-01
… and is termed dark matter. The supersymmetric neutralino provides an interesting dark matter candidate, which may self-annihilate in our galaxy, producing particles visible in the cosmic ray spectrum. During a ten day space shuttle flight, the AMS-01 detector recorded over 100 million cosmic …
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Search For Trilepton Resonances From R-Parity Violating Chargino Decays In The B−l Mssm
… and the associated production of charginos and neutralinos in the B−L Minimal Supersymmetric Standard Model with spontaneous R-parity violation. The chargino and neutralino each decay via R-parity violating couplings to a charged lepton or neutrino and a W, Z, or Higgs boson. This analysis …
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Symbolic computation of electron-proton to slepton-squark scattering cross sections based on a left-right supersymmetric extension of the standard model
… model is presented. The Feynman diagrams for the neutralino-quark-squark and chargino-quark-squark are written down, and the production of sleptons and squarks resulting from the t-channel exchange of neutralinos and charginos in electron-proton scattering is analyzed. The symbolic programming …
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Search for antideuterons and strangelets in cosmic rays with AMS-01
… in cosmic rays could be a signal for neutralino dark matter annihilation, primordial black hole evaporation and other interesting processes. No DÌ nuclei were found, and a flux limit is estimated. We also present the results of preliminary strangelet search. Some interesting effects …
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TRACKING THE INVISIBLE. A SEARCH FOR SUPERSYMMETRIC HIGGSINOS WITH THE ATLAS DETECTOR.
… analyses target the production of charginos and neutralinos near the electroweak scale and with mass splittings in the range $0.3-1.5$ GeV. Owing to the small mass differences, the heavier neutralino and chargino are relatively long-lived and decay into low-momentum charged pions, which are …
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Dark Matter Annihilation and the Observed Positron Excess
… to generate supersymmetric models in which the neutralino is the dark matter, we find that no models generated in this study match the excess as seen by PAMELA and Fermi.
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Search for Direct Top Squark Pair Production via the Fully Hadronic Final State from proton-proton Collisions at sqrt(s) = 13 TeV
… mass differences between the top squark and the neutralino, and a “high ∆m” analysis targeting topologies typical for larger mass splittings. Using data collected during operations in 2015 corresponding to an integrated luminosity of 12.9 /fb, no significant excess of events above the expected …
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Holly Pacey and the Half-Spin Particles: Searching for new physics with leptons at the ATLAS experiment
… chargino masses up to 410 GeV for a massless neutralino. This was surpassed by the second search, resulting in world-leading exclusion limits on this process, up to 420 GeV, as well as excluding direct slepton production with slepton masses up to 700 GeV and chargino pair production decaying …
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Extending the Reach of Searches for Staus, Charginos and Neutralinos with the ATLAS Experiment at the Large Hadron Collider
… supersymmetric particles; staus, charginos and neutralinos, using the 139 fb⁻¹ of data collected with the ATLAS experiment at the Large Hadron Collider between 2015 and 2018. Searches for three different production modes of these particles are considered, with new approaches for each that …
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A search for signatures of dark matter in the AMS-01 electron and antiproton spectrum
… Particles (WIMPs), such as the supersymmetric neutralino, various theories predict that their annihilation in the galaxy can give rise to anomalous features in the otherwise smooth spectra of charged cosmic rays. Up to now searches for these spectral anomalies have focused largely on …
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Dark matter, inflation and baryogenesis in supersymmetric extensions of the standard model
… is put on exploring the regions, where the neutralino (χe 0 1 ) dark matter (DM), gauge invariant inflation and electroweak baryogenesis could coexist. We chose a few benchmark points within the minimal supersymmetric SM (MSSM) with non–universal Higgs masses to illustrate how the allowed …
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Search for Long-Lived Neutral Particles in Final States with Delayed Photon and Missing Transverse Energy from Proton-Proton Collisions Using the CMS detector.
… of the SPS8 benchmark GMSB model and show that neutralinos with mean lifetime, $\tau_{\PSneutralinoOne} \leq 45$ns, and mass, $m_{\PSneutralinoOne} \leq 300$GeV/c^{2}, or effective Supersymmetry breaking energy scale, $\Lambda \leq 220TeV$, are ruled out of existence at 95\% $CL_{S}$ confidence …
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A Search for Sleptons with Intermediate Lifetimes in e+e- Collisions at sqrt(s)=189-209 GeV
… indirekte Produktion ueber Paar-Erzeugung von Neutralinos, Charginos und, im Falle des Staus, Selektronen und Smyonen) wurden beruecksichtigt. In dem untersuchten Datensatz bei sqrt(s)=189-209GeV mit einer integrierten Luminositaet von etwa 600 pb^(-1) wurde keine Evidenz fuer die Existenz von …
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Scalable parallel simulation of small-scale structures in cold dark matter
… of structure formation. The current limits on neutralino detection experiments assume a Maxwell-Boltzmann velocity distribution and smooth spatial distribution of dark matter.
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Machine learning based searches for new physics at the ATLAS experiment
… – the lightest chargino and the lightest neutralino. Using a boosted decision tree to perform multiclass classification, separate regions in phase space can be defined that are enriched in either signal or a certain background. These regions are used to search for the supersymmetric …
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Theoretical and experimental approaches to the dark energy and the cosmological constant problem.
… and for a massless, weakly interacting, lightest neutralino, lower limits on the gluino mass from 1440 to 1600 GeV are obtained, significantly extending previous limits.
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