Beyond the Standard Model Higgs at LHC

Models of Beyond the Standard Model (BSM) physics, like the Minimal Supersymmetric Standard Model (MSSM), often involve an extended Higgs sector, giving rise to extra neutral or charged Higgs bosons. The discovery reach expected from simulation studies for such additional Higgs particles is presented for the ATLAS, CMS and FP420 detectors at the LHC. Emphasis is put on production and decay modes involving heavy flavour b and tau particles, which are enhanced in large regions of BSM parameter space. The LHC experiments are indeed particularly well equipped to tackle final states containing heavy flavour.Comment: Parallel talk at ICHEP08, Philadelphia, USA, July 2008. 4 pages, 4 figure

Supersymmetry Searches with ATLAS and CMS

Highlights are presented of current searches for supersymmetry produced in proton-proton collisions at the LHC, operating at sqrt(s)=7TeV. Searches with missing transverse energy are summarized from both the ATLAS and CMS experiments. A wide range of final states is covered, including recent searches with photons, leptons, and purely hadronic final states. Future developments are anticipated with extra focus on exclusive searches in electroweak and third-generation supersymmetry production.Comment: Contribution to the proceedings of the Rencontres de Moriond EW 201

Search for Dark Matter at CMS

The results are presented from searches with the CMS experiment for directly-produced dark matter particles. All these searches use the full LHC Run-I dataset of ~20/fb of proton-proton collisions at 8TeV centre-of-mass energy. Final states with a monojet, monophoton, and monolepton signature are considered, as well as processes with dark-matter particles produced in association with top quarks. Most of these results have been interpreted using an effective field theory approach, while first results are also reported with simplified models.Comment: ICHEP2014 Proceeding

Observability of Same-Charge Lepton Topologies in Fully Leptonic Top Quark Pair Events in CMS

At the Large Hadron Collider di-leptonic ttbar+jets events can be selected with a relatively high signal-to-noise ratio and efficiency, with background events produced via Standard Model diagrams. Within the clean sample of these events, both isolated leptons have an opposite electric charge. In several models beyond the Standard Model tt/tbartbar+jets topologies are predicted, kinematically similar to the Standard Model ttbar+jets signature, where both leptons have an equal electric charge. Such a signal of new physics can be diluted by the mis-identification of the leptons or their electric charge in Standard Model ttbar+jets events. The observability of an excess of same-charge di-lepton signals above the mis-reconstruction of the Standard Model background is presented, assuming the same topology. With an integrated luminosity of 30/fb, a same-charge di-lepton signature of pp->tt/tbartbar events with a cross section larger than 1.2pb is visible in the measurement of the ratio between same-charge and opposite-charge lepton pair events

Directory publishers looking over the fence

Report on the European Association of Directory and Database Publishers (EADP) spring conference held in Barcelona, 8-9 May 2008. This European professional organisation of yellow page and business directory publishers is increasingly becoming a database publishers organisation. Its members realize that although they still are strong at the local level, they have to evolve from paper to new electronic products in order to compete with global search engines

Simplified SIMPs and the LHC

The existence of Dark Matter (DM) in the form of Strongly Interacting Massive Particles (SIMPs) may be motivated by astrophysical observations that challenge the classical Cold DM scenario. Other observations greatly constrain, but do not completely exclude, the SIMP alternative. The signature of SIMPs at the LHC may consist of neutral, hadron-like, trackless jets produced in pairs. We show that the absence of charged content can provide a very efficient tool to suppress dijet backgrounds at the LHC, thus enhancing the sensitivity to a potential SIMP signal. We illustrate this using a simplified SIMP model and present a detailed feasibility study based on simulations, including a dedicated detector response parametrization. We evaluate the expected sensitivity to various signal scenarios and tentatively consider the exclusion limits on the SIMP elastic cross section with nucleons.Comment: 18 pages, 7 figure

Discovery potential for Higgs bosons beyond the SM

The discovery potential of the CMS detector for the MSSM neutral and charged Higgs bosons at the LHC is presented based on studies with full detector simulation and event reconstruction of the principal discovery channels.Comment: Prepared for International Europhysics Conference on High Energy Physics (EPS-HEP2007), Manchester, England, 19-25 Jul 200

Singlet-Doublet Dark Matter Freeze-in: LHC displaced signatures versus cosmology

We study the Singlet-Doublet dark matter model in the regime of feeble couplings, where the dark matter abundance is obtained via the freeze-in mechanism. As a consequence of the small couplings, the heavier particles in the model are long-lived with decay length at typical scales of collider experiments. We analyse the collider signatures of the model, characterised by displaced $h$ and $Z$ bosons plus missing momentum, employing current LHC searches for displaced vertices and missing energy to significantly constrain the parameter space of the model. We also take into account the cosmological bounds relevant for our light dark matter candidate arising from Lyman-$\alpha$ forest constraints. Our analysis emphasises the interplay between displaced signatures at the LHC and cosmology for dark matter candidates whose relic abundance is obtained through the freeze-in mechanism.Comment: 42 pages, 14 figures; v2: minor discussions, clarifications, and references adde

Local search replaces the classic telephone directory

The publishers of yellow pages and business directories are suffering strong competition from the internet and are forced to seek new ways of income, taking refuge in local markets and more personalized services to their users