Recherche du Higgs dans les événements SUSY avec l'expérience ATLAS

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Higgs searches in SUSY cascade with the ATLAS detector

International audienceIn the context of Supersymmetric extensions of the Standard Model, the lightest Higgs boson can be produced via cascade decays of supersymmetric particles. We investigated the possibility of observing such events with the ATLAS detector at the LHC. We showed that, for some regions of the Minimal Super-Gravity parameter space compatibles with the last LEP searches, the lightest Higgs boson can be discovered with less than 10 fb−1, giving results competitive with standard Higgs production channels. The possibility of reconstructing the supersymmetric particles mass spectrum in these scenarios has also been studied

Prospects for SUSY Discovery and Measurements with the ATLAS Detector at the LHC

We present searches for generic SUSY models with R-parity conservation in the ATLAS detector at the LHC, based on signatures including missing transverse energy from undetected neutralinos, multiple jets and leptons or tau- and b-jets. We also show the techniques developed to reconstruct the decays of SUSY particles. We concentrate on strategies to be applied to the first inverse fb of ATLAS data

Search for a Standard Model H→ττ→ℓτh with the ATLAS detector in pp collisions at 7 TeV

The results for a search of a SM Higgs that decays to two taus, where one tau decays leptonically and the other hadronically in ATLAS data at 7TeV, corresponding to a luminosity of 4.7 fb−1, are presented. The number of observed events is consistent with the background estimation. Exclusion limits on the production cross section multiplied by the branching ratio are derived as a function of the Higgs mass

Measurement of the Z → ττ cross-section in the semileptonic channel in pp collisions at √s = 7TeV with the ATLAS detector

Tau leptons play a fundamental role in the physics program of experiments at the LHC, since they are an important signature of Higgs boson production and SUSY. The Standard Model processes W → τν and Z → ττ are standard candles for the assessment of the detector performance in identifying hadronically decaying tau leptons. The Z → ττ cross-section was measured at ATLAS in pp collisions at √s = 7TeV with the data sample collected in 2010, corresponding to 36 pb−1, demonstrating the capabilities of ATLAS to perform measurements in tau channels. The measurement in the semileptonic channel is presented

Influence of innate immunity on cancer cell stemness

Even if cancer stem cells (CSCs) represent only a small proportion of the tumor mass, they significantly account for tumor maintenance, resistance to therapies, relapse and metastatic spread, due to their increased capacity of self-renewal, multipotency, tumorigenicity and quiescence. Emerging evidence suggests that the immune contexture within the tumor microenvironment (TME) determines both the response to therapy and the clinical outcome. In this context, CSCs acquire immune evasion skills by editing immune cell functions and sculpting the immunosuppressive landscape of TME. Reciprocally, infiltrating immune cells influence CSCs self-renewal, tumorigenicity and metastasis. In this review, we summarize the immunomodulatory properties of CSCs, as well as the impact of innate immune cells on cancer cells stemness in the different phases of cancer immunoediting process and neoplastic progression

Prospects for SUSY Discovery and Measurements with the ATLAS Detector at the LHC

We present searches for generic SUSY models with R-parity conservation in the ATLAS detector at the LHC, based on signatures including missing transverse momentum from undetected neutralinos, multiple jets and leptons or b- and tau-jets. We also show the techniques developed to reconstruct the decays of SUSY particles. We concentrate on strategies to be applied to the first fb^(-1) of ATLAS data