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Search Results: 1 - 10 of 121 matches for " Marquet "
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Particle production and saturation at RHIC and LHC
Marquet, Cyrille
High Energy Physics - Phenomenology , 2008,
Abstract: The Color Glass Condensate picture of the nuclear wave function at small-x successfully predicted the suppressed production of high-pT particles at forward rapidities in deuteron-gold collisions at RHIC. This triggered more efforts which resulted in theoretical improvements and predictions for different observables which will provide further phenomenological tests. I review recent theoretical developments and discuss the resulting predictions.
Forward inclusive dijet production and azimuthal correlations in pA collisions
Marquet, Cyrille
High Energy Physics - Phenomenology , 2007, DOI: 10.1016/j.nuclphysa.2007.09.001
Abstract: We derive forward inclusive dijet production in the scattering of a dilute hadron off an arbitrary dense target, whose partons with small fraction of momentum x are described by a Color Glass Condensate. Both multiple scattering and non-linear QCD evolution at small-x are included. This is of relevance for measurements of two-particle correlations in the proton direction of proton-nucleus collisions at RHIC and LHC energies. The azimuthal angle distribution is peaked back to back and broadens as the momenta of the measured particles gets closer to the saturation scale.
Hard diffraction and the Color Glass Condensate
Marquet, Cyrille
High Energy Physics - Phenomenology , 2007,
Abstract: Following the Good-and-Walker picture, hard diffraction in the high-energy/small-x limit of QCD can be described in terms of eigenstates of the scattering matrix off a Color Glass Condensate. From the CGC non-linear evolution equations, it is then possible to derive the behavior of diffractive cross-sections at small $x.$ I discuss recent results, in particular the consequences of the inclusion of Pomeron loops in the evolution.
A unified description of diffractive deep inelastic scattering with saturation
Marquet, Cyrille
High Energy Physics - Phenomenology , 2007, DOI: 10.1103/PhysRevD.76.094017
Abstract: We propose a new description of inclusive diffraction in deep inelastic scattering (DIS). The diffractive structure functions are expressed in the dipole picture and contain heavy-quark contributions. The dipole scattering amplitude, a saturation model fitted on inclusive DIS data, features a saturation scale Q_s(x) larger than 1 GeV for x=10^{-5}. The q\bar{q}g contribution to the diffractive final state is modeled in such a way that both the large-Q^2 and small-beta limits are implemented. In the regime xpom<0.01 in which saturation is expected to be relevant, we obtain a parameter-free description of the HERA data with chi^2/points=1.2.
Heavy-quark energy loss in pQCD and SYM plasmas
Marquet, Cyrille
High Energy Physics - Phenomenology , 2008, DOI: 10.1140/epjc/s10052-009-1014-2
Abstract: We consider heavy-quark energy loss and pT-broadening in a strongly-coupled N=4 Super Yang Mills (SYM) plasma, and the problem of finite-extend matter is addressed. When expressed in terms of the appropriate saturation momentum, one finds identical parametric forms for the energy loss in pQCD and SYM theory, while pT-broadening is radiation dominated in SYM theory and multiple scattering dominated in pQCD.
Saisir les corps en image, les offrir en pature : photographes et photographies obscènes sous le Second Empire, d’après les archives de la police des m urs (1852-1870), master 2 d’histoire contemporaine, Université Paris Diderot - Paris 7 (dir. Gabrielle Houbre)
Benjamin Marquet
Genre & Histoire , 2012,
Abstract:
The Matter-Antimatter Concept Revisited
Marquet P.
Progress in Physics , 2010,
Abstract: In this paper, we briefly review the theory elaborated by Louis de Broglie who showed that in some circumstances, a particle tunneling through a dispersive refracting material may reverse its velocity with respect to that of its associated wave (phase velocity): this is a consequence of Rayleigh's formula defining the group velocity. Within his Double Solution Theory, de Broglie re-interprets Dirac's aether concept which was an early attempt to describe the matter-antimatter symmetry. In this new approach, de Broglie suggests that the (hidden) sub-quantum medium required by his theory be likened to the dispersive and refracting material with identical properties. A Riemannian generalization of this scheme restricted to a space-time section, and formulated within an holonomic frame is here considered. This procedure is shown to be founded and consistent if one refers to the extended formulation of General Relativity (EGR theory), wherein pre-exists a persistent field.
Couple parental – couple conjugal, multiparenté – multiparentalité Parental Couple - Conjugal couple, Multi-parentage – Multi-parentality. Reflections on Naming the Transformations Occurring in the Contemporary Family
Jacques Marquet
Recherches Sociologiques et Anthropologiques , 2011, DOI: 10.4000/rsa.244
Abstract: Au cours du dernier siècle, et plus singulièrement encore au cours des cinquante dernières années, la famille a connu des transformations majeures. Le champ de la famille a alors vu appara tre une multitude de termes traduisant l’émergence de ces réalités nouvelles, mais aussi, et peut-être surtout, leur progressive reconnaissance sociale, ou à tout le moins, la mise à l’agenda des questions soulevées par celles-ci. Dans cet article, à partir de deux paires de concepts émergents (couple parental et couple conjugal d’une part, pluriparenté et pluriparentalité d’autre part), nous proposons quelques réflexions sur les potentialités et les limites des catégories d’intelligibilité produites et diffusées par les chercheurs en sciences sociales. In the course of the last century, and still more singularly in the last fifty years, the family has undergone major transformations. The domain of the family has thus seen the appearance of a multitude of terms revealing the emergence of these new realities, but also and perhaps especially, their progressive social recognition or, at the very least, the questions they raise being placed on the social agenda. In this article, starting from two pairs of emerging concepts (parental couple and conjugal couple on the one hand, and multi-parentage and multi-parentality on the other), we propose some reflections on the potentialities and limits of the categories of intelligibility produced and popularized by researchers in the social sciences.
An Extended Theory of General Relativity Unifying the Matter-Antimatter States
Patrick Marquet
Applied Physics Research , 2011, DOI: 10.5539/apr.v3n1p60
Abstract: This paper follows one of our earlier publications detailing an extended theory of General Relativity (GR) with two types of curvatures. In this framework, we first extend the Riemannian spinor theory in the formalism of A.Lichnerowicz. We then suggest that the non vanishing covariant derivative of the metric tensor linked to the extra curvature of our extended GR theory, be related to the trace of a specific Hermitean matrix. In the Riemannian theory, this matrix reduces to the classical gamma matrix that is precisely designed to distinguish the spin one half fields from its anti Fermionic counterpart. Our extended General Relativity theory therefore appears as unifying the Fermion-anti Fermion field states, and would legitimate the hidden medium concept introduced by Louis de Broglie in his attempt to explain the matter-antimatter symmetry.
An improved approximation for the moist-air entropy potential temperature $θ_s$
Pascal Marquet
Physics , 2015,
Abstract: The moist-air entropy is defined in Marquet (QJRMS 2011, arXiv:1401.1097) by $\boxed{s = s_{ref} + c_{pd} \: \ln(\theta_{s})}$ in terms of two constant values ($s_{ref}$, $c_{pd}$) and a potential entropy temperature denoted by $\theta_s$. It is shown in Marquet (2011) that a quantity denoted by $({\theta}_{s})_1$ plays the role of a leading order approximation of ${\theta}_{s}$. The aim of this note is to demonstrate in a more rigorous way that $({\theta}_{s})_1$ is indeed the leading order approximation of ${\theta}_{s}$, and to derive a second order approximation which may be used in computations of values, gradients or turbulent fluxes of moist-air entropy. Some impacts of this second order approximation are described in this brief version of a note to be submitted to the QJRMS.
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