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Grenoble, France

Semay C.,University of Mons | Buisseret F.,University of Mons | Silvestre-Brac B.,LPSC
Few-Body Systems | Year: 2011

Approximate analytical energy formulas for N-body semirelativistic Hamiltonians with one- and two-body interactions are obtained within the framework of the auxiliary field method. We first review the method in the case of nonrelativistic two-body problems. A general procedure is then given for N-body systems and applied to the case of baryons in the large-Nc limit. © 2010 Springer-Verlag. Source

Ledroit-Guillon F.,LPSC
Nuclear Physics B - Proceedings Supplements | Year: 2010

We discuss how ATLAS has been preparing for the analysis of the first fb-1 of good data at 14 TeV in view of discovering new physics beyond the Standard Model. We show some ideas developed for understanding the backgrounds and we present as realistic as possible estimates of the reach of the experiment. © 2010 Elsevier B.V. Source

Clement B.,LPSC
EPJ Web of Conferences | Year: 2013

The main purpose of these lectures is to provide the reader with the tools needed to data analysis in the framework of physics experiments. Basic concepts are introduced together with examples of application in experimental physics. The lecture is divided into two parts: probability and statistics. It is build on the introduction from "data analysis in experimental sciences" given in [1] © Owned by the authors, published by EDP Sciences, 2013. Source

Lhersonneau G.,Ganil | Malkiewicz T.,LPSC | Malkiewicz T.,Center for Science | Trzaska W.H.,JYFL
Hyperfine Interactions | Year: 2014

Cross-sections for nuclide production in fast-neutron induced fission of natural uranium are part of the input for predictions of yields of neutron-rich nuclides obtainable at Radioactive Ion Beam facilities. We first describe the neutron spectra produced according to the scheme once envisaged for SPES (protons on an enriched 13C target) and the one adopted for SPIRAL2 (deuterons on natural carbon), which both have been measured at JYFL. We then present the measurements of Z-splits in isobaric chains performed at IGISOL. When coupled with the fission cross-section and A-splits for the relevant neutron spectrum, they allow estimates of nuclide cross-sections. It looks that calculations, even those based on modern libraries, are too optimistic by about a factor of two. © 2012 Springer Science+Business Media B.V. Source

Chatterjee A.,Harish Chandra Research Institute | Drees M.,University of Bonn | Kulkarni S.,LPSC
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

In the framework of the minimal cosmological standard model, the ΛCDM model, the dark matter density is now known within an error of a few percent; this error is expected to shrink even further once PLANCK data are analyzed. Matching this precision by theoretical calculations implies that at least leading radiative corrections to the annihilation cross section of the dark matter particles have to be included. Here we compute one kind of large corrections in the context of the minimal supersymmetric extension of the Standard Model: corrections associated with two-point function corrections on chargino and neutralino (collectively denoted by χ) lines. These can be described by effective χ-fermion-sfermion and χ-χ-Higgs couplings. We also employ one-loop corrected χ masses, using a recently developed version of the on-shell renormalization scheme. The resulting correction to the predicted dark matter density depends strongly on parameter space, but it can easily reach 3%. © 2012 American Physical Society. Source

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