arXiv subjects

Gudrid Moortgat-Pick

Publications and source records attributed to Gudrid Moortgat-Pick.

78 records · Page 5Linked to original sources

arXiv2004

Motivation for polarised $e^-$ and $e^+$ Beams

A future Linear Collider is well suited for discovering physics beyond the Standard Model, for revealing the structure of the underlying physics as well as for performing high precision tests of the Standard Model. The use of polarised beams will be one of the powerful tools for reaching these goals. This paper highlights some recent studies of having both beams simultaneously polarised which allows to use longitudinally as well as transversely polarised beams.

hep-ph↗

arXiv2004

Synergy of combined LHC and LC Analyses in Susy Searches

We present a case study for the synergy of combined LHC and LC analyses in Susy searches where simultaneous running of both machines is very important. In case that only light non-coloured Susy particles are accessible at a Linear Collider with an initial energy of $\sqrt{s}=500$ GeV, the precise analysis at the LC nevertheless leads to an accurate Susy parameter determination. This allows the prediction of heavy Susy particles. Providing these LC results as input for LHC analyses could be crucial for the identification of signals resulting in a direct measurement of the heavy neutralinos. These results provide an important consistency test of the underlying model. Furthermore, feeding back the LHC results into LC analyses leads to an improvement in the parameter determination.

hep-ph↗

arXiv2003

Prototype for an Undulator-based Source for Polarised Positrons: International Polarised Positron Collaboration: Project E-166

The full exploitation of the physics potential of a future Linear Collider requires the development of polarised positron beams. A very promising scheme for the technical realisation is the use of helical undulators, generating circular polarised photons of several MeV which are then converted in a thin target to longitudinally polarised positrons. The experiment E-166 tests this scheme. It uses the low-emittance 50-GeV electron beam at the Final Focus Test Beam (FFTB) at SLAC, passing through a 1 meter-long helical undulator. The flux and polarisation of the undulator photons as well as the properties of the positrons will be measured and will be compared with simulations.

hep-ph↗

arXiv2003

A Future Linear Collider with polarised beams: Searches for New Physics

There exists a world--wide consensus for a future $e^+e^-$ Linear Collider in the energy range between $\sqrt{s}=500--1000$ GeV as the next large facility in HEP. The Linear Collider has a large physics potential for the discovery of new physics beyond the Standard Model and for precision studies of the Standard Model itself. It is well suited to complement and extend the physics program of the LHC. The use of polarised beams at a Linear Collider will be one of the powerful tools. In this paper some highlights of searches for physics beyond the Standard Model at a future Linear Collider with polarised $e^-$ and $e^+$ beams are summarised.

hep-ph↗

arXiv2002

Disentangling fundamental MSSM Parameters: Light Gaugino/Higgsino System

In order to reveal the underlying structure of Supersymmetry one has to determine the low--energy parameters without assuming a specific SUSY breaking scheme. In this paper we show a procedure how to determine M_1, Φ_{M_1}, M_2, μ, Φ_μ and \tanβeven in the case when only light charginos \tildeχ^{\pm}_1 and neutralinos \tildeχ^0_1, \tildeχ^0_2 would be accessible at the first stage of a future Linear Collider with polarized beams.

hep-ph↗

arXiv2001

Physics Opportunities with Polarized e- and e+ Beams at TESLA

Beam polarization at e+ e- linear colliders will be a powerful tool for high precision analyses. Often it is assumed that the full information from polarization effects is provided by polarization of the electron beam and no further information can be obtained by the simultaneous polarization of the positrons. In this paper we point out the advantages of polarizing both beams, and summarize the polarization-related results of the Higgs, Electroweak, QCD, SUSY and Alternative Theories working groups of the ECFA/DESY workshop for a planned linear collider operating in the energy range sqrt{s}= 500-800 GeV.

hep-ph↗