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Search Results: 1 - 10 of 167623 matches for " E. Hesselbach "
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CP Violation in SUSY Particle Production and Decay
Hesselbach, S.
High Energy Physics - Phenomenology , 2007,
Abstract: Recent studies about CP violation in the Minimal Supersymmetric Standard Model (MSSM) with complex parameters are reviewed. In order to unambiguously identify the CP-violating phenomena it is necessary to study CP-odd or T-odd observables. In chargino and neutralino production and decay at the International Linear Collider (ILC) triple product asymmetries and asymmetries defined via transverse beam polarization have been analyzed. It has been found that these asymmetries can be measured at the ILC in a large region of the MSSM parameter space and are thus an important tool to establish CP violation in supersymmetry.
Umgebungserfassungssystem fuer mobile Roboter (environment logging system for mobile autonomous robots)
Dirk Hesselbach
Computer Science , 2012,
Abstract: This diploma thesis describes the theoretical bases, the conception of the module and the final result of the development process in application. for the environment logging with a small mobile robot for interiors should be sketched an economical alternative to the expensive laser scanners. the structure, color or the material of the objects in the radius of action, as well as the environment brightness and illuminating are to have thereby no influence on the results of measurement.
Neutralino mass bounds at the upgraded LEP collider
F. Franke,S. Hesselbach
Physics , 1996, DOI: 10.1016/0370-2693(96)01058-1
Abstract: Assuming that no supersymmetric signature will be found at the upgraded LEP collider we derive lower bounds on the masses of the four neutralinos $\tilde{\chi}_i^0$ in the Minimal Supersymmetric Standard Model (MSSM). We consider the recently published results from the search for the light chargino $\tilde{\chi}^\pm_1$ and the next-to-lightest neutralino $\tilde{\chi}^0_2$ at LEP1.5 and study the consequences of possible future lower $\tilde{\chi}^\pm_1$ and $\tilde{\chi}^0_2$ mass limits between 65 and 95 GeV. For a chargino mass bound of 66.8 GeV at LEP1.5, a massless neutralino is not excluded for $\tan\beta < 1.2$. If either $\tan\beta > 2.3$ or the gluino mass $m_{\tilde{g}} > 160$ GeV, we find $m_{\tilde{\chi}_1^0} > 28$ GeV. A possible chargino bound $m_{\tilde{\chi}_1^\pm} > 95$ GeV at LEP2 would raise this bound to 31 GeV (for all $\tan\beta$) or 44 GeV ($\tan\beta > 2$).
Chargino-Sneutrino Production in Electron-Photon Collisions
S. Hesselbach,H. Fraas
Physics , 1996, DOI: 10.1103/PhysRevD.55.1343
Abstract: We study the production of charginos and sneutrinos in electron-photon collisions within the minimal supersymmetric standard model (MSSM). The high energy photons can be generated by Compton backscattering of intense laser pulses off one of the beams of the Next Linear Collider (NLC). This process could offer a significant opportunity to identify sneutrinos, which exclusively decay invisibly into a neutrino and the LSP, since the cross sections are two orders of magnitude higher than for the radiative production of invisible sneutrinos. For three scenarios of gaugino-higgsino mixing the cross sections and polarization asymmetries are computed and the resulting signatures are compared with the SM background.
Selectron Mass Effects in Neutralino Production
S. Hesselbach,H. Fraas
Physics , 1999,
Abstract: We study the possibility to measure the masses of the selectrons in neutralino production at an e^+ e^- linear collider with polarized beams. The cross sections and polarization asymmetries of neutralinos with gaugino character strongly depend on the masses of the exchanged selectrons. If the usual GUT relations of the selectron masses in the MSSM are relaxed large effects are possible especially in the polarization asymmetries. These can be used to determine the masses of both selectrons.
Production of singlino dominated neutralinos in extended supersymmetric models
F. Franke,S. Hesselbach
Physics , 2001, DOI: 10.1016/S0370-2693(01)01499-X
Abstract: Neutralinos with a large singlino component may appear in extended supersymmetric models with additional singlet Higgs fields. Since singlinos do not couple to (s)fermions and gauge bosons, the cross sections for the production of singlino dominated neutralinos are generally small. Within the framework of the Next-to-Minimal Supersymmetric Standard Model (NMSSM) and an E_6 inspired model we study neutralino production e^+ e^- --> neutralino_1 neutralino_2 (neutralino_1,2 neutralino_3) with a singlino dominated neutralino_2 (neutralino_3). It is shown that neutralinos with a singlino contribution up to 99 % can be produced with a cross section larger than 1 fb and may therefore be detected at a high luminosity e^+ e^- linear collider even if they are not the LSP.
Spectro-interferometry of the Be star delta Sco: Near-Infrared Continuum and Gas Emission Region Sizes in 2007
R. Millan-Gabet,J. D. Monnier,Y. Touhami,D. Gies,E. Hesselbach,E. Pedretti,N. Thureau,M. Zhao,T. ten Brummelaar
Physics , 2010, DOI: 10.1088/0004-637X/723/1/544
Abstract: We present near-infrared H and K-band spectro-interferometric observations of the gaseous disk around the primary Be star in the delta Sco binary system, obtained in 2007 (between periastron passages in 2000 and 2011). Observations using the CHARA/MIRC instrument at H-band resolve an elongated disk with a Gaussian FWHM 1.18 x 0.91 mas. Using the Keck Interferometer, the source of the K-band continuum emission is only marginally spatially resolved, and consequently we estimate a relatively uncertain K-band continuum disk FWHM of 0.7 +/- 0.3 mas. Line emission on the other hand, He1 (2.0583 micron) and Br gamma (2.1657 micron), is clearly detected, with about 10% lower visibilities than those of the continuum. When taking into account the continuum/line flux ratio this translates into much larger sizes for the line emission regions: 2.2 +/- 0.4 mas and 1.9 +/- 0.3 mas for He1 and Br gamma respectively. Our KI data also reveal a relatively flat spectral differential phase response, ruling out significant off-center emission. We expect these new measurements will help constrain dynamical models being actively developed in order to explain the disk formation process in the delta Sco system and Be stars in general.
Associated charged Higgs and W boson production in the MSSM at the LHC
Eriksson, David;Hesselbach, Stefan;Rathsman, Johan
High Energy Physics - Phenomenology , 2007,
Abstract: We investigate the associated production of charged Higgs bosons (H^\pm) and W bosons at the CERN Large Hadron Collider, using the leptonic decay H^+ -> tau^+ nu_tau and hadronic W decay, within different scenarios of the Minimal Supersymmetric Standard Model (MSSM) with both real and complex parameters. Performing a parton level study we show how the irreducible Standard Model background from W + 2 jets can be controlled by applying appropriate cuts. In the standard m_h^max scenario we find a viable signal for large tan beta and intermediate H^\pm masses (~ m_t). In MSSM scenarios with large mass-splittings among the heavy Higgs bosons the cross-section can be resonantly enhanced by factors up to one hundred, with a strong dependence on the CP-violating phases.
H^\pm W^\mp production in the MSSM at the LHC
Eriksson, David;Hesselbach, Stefan;Rathsman, Johan
High Energy Physics - Phenomenology , 2007, DOI: 10.1088/1742-6596/110/7/072008
Abstract: We investigate the viability of observing charged Higgs bosons (H^\pm) produced in association with W bosons at the CERN Large Hadron Collider, using the leptonic decay H^+ -> tau^+ nu_tau and hadronic W decay, within the Minimal Supersymmetric Standard Model. Performing a parton level study we show how the irreducible Standard Model background from W + 2 jets can be controlled by applying appropriate cuts. In the standard m_h^max scenario we find a viable signal for large tan beta and intermediate H^\pm masses (~ m_t).
Open Modular Robot Control Architecture for Assembly Using the Task Frame Formalism
Jochen Maass,Nnamdi Kohn,Juergen Hesselbach
International Journal of Advanced Robotic Systems , 2008,
Abstract: The task frame formalism allows the programmer to overcome the drawbacks of the traditional robot oriented assembly programming, moving the programmer's focus on the robot task. Additionally skill primitives contribute to a more natural programming paradigm. In this paper a robot control architecture is presented that implements both of these concepts providing a framework to easily implement new control features. Focus is put on a novel modular trajectory generator and the applied three-layered scheduling design. This architecture is based on the communication middleware MIRPA-X and has been experimentally validated on the HEXA parallel manipulator. The future use of distributed computing and runtime scheduling optimization are discussed.
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