Simulation of Z plus Graviton/Unparticle Production at the LHC

Theories with extra dimensions have gained much interest in recent years as candidates for a possible extension of the SM. The observation of large extra dimensions through real graviton emission is one of the most popular related new phenomena. The main experimental signatures from graviton emission are production of single jet and single photon events, which have been studied in great detail. This work describes the implementation of graviton production together with either a Z or a photon in Pythia 8. The potential of using Z plus graviton production at the LHC as a complementary channel is also studied. For completeness, this work also includes the more recently proposed scenario of unparticle emission, since the effective theory of unparticles to some extent represents a generalization of the large extra dimension model.Comment: 11 pages, 7 figures; Added material; Accepted by Eur. Phys. J.

Search For Extra Dimensions At LEP

Searches for extra dimensions have been made at the four LEP experiments, ALEPH, DELPHI, L3 and OPAL, where different processes have been searched for within both the ADD and Randall-Sundrum scenarios. Since no signs of any signal have been observed the results have been used to set exclusion limits in the corresponding extra dimension models. This talk presents both individual results from the LEP experiments as well as combined results from the searches for graviton emission and virtual graviton exchange. The results are mainly based on the data recorded between the years 1998-2000, which corresponds to an integrated luminosity of 0.6 fb$^{-1}$ per experiment and center-of-mass energies from 189 up to 209 GeV.Comment: 4 pages, 4 figures. Proceedings of the 32nd International Conference on High-Energy Physics (ICHEP04), Beijing, China, 16-22 Aug 200

A Review of the Supersymmetry Searches at LEP

The searches for supersymmetric particles by the four LEP experiments, ALEPH, DELPHI, L3, OPAL, have been made for many different theoretical models and phenomenological scenarios. Since no significant signs of a SUSY signal have been observed the results have been used to set exclusion limits and to constrain the supersymmetric parameter space. This talk will focus on combined SUSY searches, within the mSUGRA framework, from the four LEP experiments. The results are based mainly on the data recorded between the years 1996-2000, which corresponds to an integrated luminosity of 2.7 fb$^{-1}$ and center-of-mass energies from 161 up to 208 GeV.Comment: 8 Pages, 9 figures, talk given at the XXXVIIIth Rencontres de Moriond: Electroweak Interactions and Unified Theories, Les Arcs, France, March 15-22, 200

Status of the Forward Physics Projects in ATLAS

The ATLAS experiment at the LHC is building several detector systems for forward physics studies and to determine the luminosity. The main forward systems consist of a Cerenkov detector called LUCID, a Zero Degree Calorimeter (ZDC) and Roman Pots which will house a scintillating fiber tracker system called ALFA. Here we report some of the forward physics activities that are foreseen in ATLAS together with the status of the related detector systems.Comment: 4 pages, 2 figures. Proceedings of the XV International Workshop on Deep-Inelastic Scattering and Related Subjects, Munich, Germany, April 200

Search for one large extra dimension with the DELPHI detector at LEP2

Single photons detected by the DELPHI experiment at LEP2 in the years 1997-2000 are used to investigate the existence of a single extra dimension in a modifed ADD scenario with slightly warped large extra dimensions. The data collected at centre-of-mass energies between 180 and 209 GeV for an integrated luminosity of ~650 pb^-1 agree with the predictions of the Standard Model and allow a limit to be set on graviton emission in one large extra dimension. The limit obtained on the fundamental mass scale MD is 1.69 TeV at 95% CL, with an expected limit of 1.71 TeV.Comment: 10 pages, 2 figures, contributed to Lepton Photon 2007, Daegu, Kore

Branching ratio measurements of the 7.12-MeV state in 16O

Knowledge of the gamma-ray branching ratios of the 7.12-MeV state of 16O is important for the extrapolation of the 12C(a,g)16O cross section to astrophysical energies. Ground state transitions provide most of the 12C(a,g)16O total cross section while cascade transitions have contributions of the order of 10-20%. Determining the 7.12-MeV branching ratio will result in a better extrapolation of the cascade and E2 ground state cross section to low energies. We report here on measurements on the branching ratio of the 7.12-MeV level in 16O.Comment: 4 pages, 5 figures. Contribution to the Eigth International Symposium on Nuclei in the Cosmo