Duhr C.,Durham University |
Fuks B.,CNRS Hubert Curien Multi-disciplinary Institute
Computer Physics Communications | Year: 2011
We describe an additional module for the Mathematica package FeynRules that allows for an easy building of any N=1 supersymmetric quantum field theory, directly in superspace. After the superfield content of a specific model has been implemented, the user can study the properties of the model, such as the supersymmetric transformation laws of the associated Lagrangian, directly in Mathematica. While the model dependent parts of the latter, i.e., the soft supersymmetry-breaking Lagrangian and the superpotential, have to be provided by the user, the model independent pieces, such as the gauge interaction terms, are derived automatically. Using the strengths of the FeynRules program, it is then possible to derive all the Feynman rules associated to the model and implement them in all the Feynman diagram calculators interfaced to FeynRules in a straightforward way. Program summary: Program title: "FeynRules" Catalogue identifier: AEDI-v1-1 Program summary URL: http://cpc.cs.qub.ac.uk/ summaries/AEDI-v1-1.html Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html No. of lines in distributed program, including test data, etc.: 46 491 No. of bytes in distributed program, including test data, etc.: 381 582 Distribution format: tar.gz Programming language: Mathematica Computer: Platforms on which Mathematica is available Operating system: Operating systems on which Mathematica is available Classification: 11.1, 11.6 Catalogue identifier of previous version: AEDI-v1-0 Journal reference of previous version: Comput. Phys. Comm. 180 (2009) 1614 Does the new version supersede the previous version?: No Nature of problem: Study of the properties of N=1 supersymmetric field theories using the superfield formalism, derivation of the associated Lagrangians. Solution method: We use the FeynRules package and define internally the N=1 superspace. Then, we implement a module allowing to: Perform the Grassmann variable series expansion so that any superfield expression can be developed in terms of the component fields. The resulting expression is thus suitable to be treated by the FeynRules package directly.Execute a set of operations associated to the superspace, such as the superderivatives of an expression or the calculation of its supersymmetric transformation laws. Reasons for new version: This is an interim update to the FeynRules-1.4 (AEDI-v1-0), package which includes a new superspace module. Further modules will be added in the future and eventually published as FeynRules-1.6. Summary of revisions: This revised version contains, in addition to the core program, the superfield module of FeynRules. Restrictions: Superfields related to spin 3/2 and 2 particles are not implemented. Unusual features: All calculations in the internal routines are performed completely. The only hardcoded core is the Grassmann variable algebra. Running time: It depends on the user's purposes. The extraction of a Lagrangian in terms of the component fields may take a few minutes for a complete model with complex mixing between the fields. © 2011 Elsevier B.V. All rights reserved.
Thierry B.,French National Center for Scientific Research |
Thierry B.,CNRS Hubert Curien Multi-disciplinary Institute
Philosophical Transactions of the Royal Society B: Biological Sciences | Year: 2013
The evolutionary study of social systems in non-human primates has long been focused on ecological determinants. The predictive value of socioecological models remains quite low, however, in particular because such equilibrium models cannot integrate the course of history. The use of phylogenetic methods indicates that many patterns of primate societies have been conserved throughout evolutionary history. For example, the study of social relations in macaques revealed that their social systems are made of sets of correlated behavioural traits. Some macaque species are portrayed by marked social intolerance, a steep dominance gradient and strong nepotism, whereas others display a higher level of social tolerance, relaxed dominance and a weaker influence of kinship. Linkages between behavioural traits occur at different levels of organization, and act as constraints that limit evolutionary responses to external pressures. Whereas these constraints can exert strong stabilizing selection that opposes the potential changes required by the ecological environment, selective mechanisms may have the potential to switch thewhole social system from one state to another by acting primarily on some key behavioural traits that could work as pacemakers. © 2013 The Author(s) Published by the Royal Society. All rights reserved.
Conte E.,Upper Alsace University |
Fuks B.,CNRS Hubert Curien Multi-disciplinary Institute |
Serret G.,CNRS Hubert Curien Multi-disciplinary Institute
Computer Physics Communications | Year: 2013
We present MadAnalysis 5, a new framework for phenomenological investigations at particle colliders. Based on a C++ kernel, this program allows us to efficiently perform, in a straightforward and user-friendly fashion, sophisticated physics analyses of event files such as those generated by a large class of Monte Carlo event generators. MadAnalysis 5 comes with two modes of running. The first one, easier to handle, uses the strengths of a powerful Python interface in order to implement physics analyses by means of a set of intuitive commands. The second one requires one to implement the analyses in the C++ programming language, directly within the core of the analysis framework. This opens unlimited possibilities concerning the level of complexity which can be reached, being only limited by the programming skills and the originality of the user. © 2012 Elsevier B.V. All rights reserved.
Conesa del Valle Z.,CERN |
Conesa del Valle Z.,CNRS Hubert Curien Multi-disciplinary Institute
Nuclear Physics A | Year: 2013
Heavy-flavor hadron production studies in Pb-Pb collisions at √sNN=2.76TeV with the 2010 and 2011 data samples are presented. The measurements are performed with the ALICE detector in various decay channels and in a wide kinematic range. Heavy-flavor hadrons exhibit a suppression in the most central Pb-Pb collisions that amounts to a factor 3-5 for p T ~ 8-10 GeV/c. The second harmonic of the azimuthal distribution Fourier decomposition, v2, is non-zero for non-central collisions at intermediate p T (~3 GeV/c). © 2013 CERN.
Le Maho Y.,CNRS Hubert Curien Multi-disciplinary Institute
Nature Methods | Year: 2014
Investigating wild animals while minimizing human disturbance remains an important methodological challenge. When approached by a remote-operated vehicle (rover) which can be equipped to make radio-frequency identifications, wild penguins had significantly lower and shorter stress responses (determined by heart rate and behavior) than when approached by humans. Upon immobilization, the rover—unlike humans—did not disorganize colony structure, and stress rapidly ceased. Thus, rovers can reduce human disturbance of wild animals and the resulting scientific bias. © 2014 Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.
Billard I.,CNRS Hubert Curien Multi-disciplinary Institute
Handbook on the Physics and Chemistry of Rare Earths | Year: 2013
Ionic Liquids are of great interest in all fields of chemistry and material science. Apart from their "green" properties, their radioresistance and fantastic chemical versatility offer a new playground to nuclear chemists and others in view of liquid/liquid extraction of RE and actinides. Following a brief summary of RE and An liquid/liquid extraction by use of molecular solvents, the author reviews and discusses the main properties of ionic liquids that are of importance to liquid/liquid extraction. Then, the various ways ionic liquids are used for the extraction/separation of RE and An are critically reviewed and discussed. Focus is on mechanism and highlight is put on differences between ionic liquids and molecular solvents. © 2013 Elsevier B.V..
Sieja K.,CNRS Hubert Curien Multi-disciplinary Institute |
Nowacki F.,CNRS Hubert Curien Multi-disciplinary Institute
Physical Review C - Nuclear Physics | Year: 2010
Recent progress in experimental techniques allows us to study very exotic systems like neutron-rich nuclei in the vicinity of Ni78. The spectroscopy of this region can nowadays be studied theoretically in the large scale shell model calculations. In this work, we perform a shell model study of odd copper nuclei with N=40-50, in a large valence space with the Ca48 core, using a realistic interaction derived from the CD-Bonn potential. We present the crucial importance of the proton core excitations for the description of spectra and magnetic moments, which are for the first time correctly reproduced in theoretical calculations. Shell evolution from Ni68 to Ni78 is discussed in detail. A weakening of the Z=28 gap when approaching the N=50 shell closure, suggested by the experimental evidence, is confirmed in the calculations. © 2010 The American Physical Society.
Hippolyte B.,CNRS Hubert Curien Multi-disciplinary Institute
Acta Physica Polonica B | Year: 2012
Strange quark and particle production is studied at the LHC with unprecedented high beam energies in both heavy-ion and proton-proton collisions: on the one hand, strangeness is used for investigating chemical equilibration and bulk properties; on the other hand, strange particles contribute to probe different kinematical domains, from the one where collective phenomena are at play up to the region dominated by pQCD-calculable processes. We highlight the suitability of the ALICE experiment for this topic, presenting our latest measurements and comparing them to models.
Fuks B.,CNRS Hubert Curien Multi-disciplinary Institute
International Journal of Modern Physics A | Year: 2012
Thanks to the latest development in the field of Monte Carlo event generators and satellite programs allowing for a straightforward implementation of any beyond the Standard Model theory in those tools, studying the property of any softly-broken supersymmetric theory is become an easy task. We illustrate this statement in the context of two nonminimal supersymmetric theories, namely the Minimal Supersymmetric Standard Model with R-parity violation and the Minimal R-symmetric Supersymmetric Standard Model and choose to probe interaction vertices involving a nonstandard color structure and the sector of the top quark. We show how to efficiently implement these theories in the MATHEMATICA package FEYNRULES and use its interfaces to Monte Carlo tools for phenomenological studies. For the latter, we employ the latest version of the MADGRAPH program. © 2012 World Scientific Publishing Company.
Beck C.,CNRS Hubert Curien Multi-disciplinary Institute
Journal of Physics: Conference Series | Year: 2013
With the recent availability of state-of-the-art radioactive ion beams, there has been a renew interest in the investigation of nuclear reactions with heavy ions near the Coulomb barrier. The role of inelastic and transfer channel couplings in fusion reactions induced by stable heavy ions can be revisited. Detailed analysis of recent experimental fusion cross sections by using standard coupled-channel calculations is first discussed. Multi-neutron transfer effects are introduced in the fusion process below the Coulomb barrier by analyzing 32S+90,96Zr as benchmark reactions. The enhancement of fusion cross sections for 32S+96Zr is well reproduced at sub-barrier energies by NTFus code calculations including the coupling of the neutrontransfer channels following the Zagrebaev semi-classical model. Similar effects for 40Ca+90Zr and 40Ca+96Zr fusion excitation functions are found. The breakup coupling in both the elastic scattering and in the fusion process induced by weakly bound stable projectiles is also shown to be crucial. In the second part of this work, full coupled-channel calculations of the fusion excitation functions are performed by using the breakup coupling for the more neutron-rich reaction and for the more weakly bound projectiles. We clearly demonstrate that Continuum-Discretized Coupled-Channel calculations are capable to reproduce the fusion enhancement from the breakup coupling in 6Li+59Co.