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Search Results: 1 - 10 of 127 matches for " Christoffer Flensburg "
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Correlations and Fluctuations in the Initial State of high energy Heavy Ion Collisions
Christoffer Flensburg
Physics , 2011,
Abstract: Initial states of high energy heavy ion collisions are studied using a dipole model through the DIPSY event generator that dynamically includes saturation together with the fluctuations and correlations of the BFKL cascade. The eccentricities of first up to fourth moment are calculated at RHIC and LHC. Predictions are made for correlations and fluctuations in rapidity of the eccentricities, and conventional theoretical approximations are tested. A large set of initial state Au-Au, Cu-Au and Pb-Pb collisions have been generated and are published online.
Elastic and quasi-elastic $pp$ and $\gamma^\star p$ scattering in the Dipole Model
Flensburg, Christoffer;Gustafson, Gosta;Lonnblad, Leif
High Energy Physics - Phenomenology , 2008, DOI: 10.1140/epjc/s10052-009-0868-7
Abstract: We have in earlier papers presented an extension of Mueller's dipole cascade model, which includes sub-leading effects from energy conservation and running coupling as well as colour suppressed saturation effects from pomeron loops via a ``dipole swing''. The model was applied to describe the total and diffractive cross sections in $pp$ and $\gamma^*p$ collisions, and also the elastic cross section in $pp$ scattering. In this paper we extend the model to describe the corresponding quasi-elastic cross sections in $\gamma^*p$, namely the exclusive production of vector mesons and deeply virtual compton scattering. Also for these reactions we find a good agrement with measured cross sections. In addition we obtain a reasonable description of the $t$-dependence of the elastic $pp$ and quasi-elastic $\gamma^\star p$ cross sections.
Eccentricity and elliptic flow in proton-proton collisions from parton evolution
Emil Avsar,Christoffer Flensburg,Yoshitaka Hatta,Jean-Yves Ollitrault,Takahiro Ueda
Physics , 2010, DOI: 10.1016/j.physletb.2011.07.031
Abstract: It has been argued that high-multiplicity proton-proton collisions at the LHC may exhibit collective phenomena usually studied in the context of heavy-ion collisions, such as elliptic flow. We study this issue using DIPSY - a Monte Carlo event generator based on the QCD dipole model. We calculate the eccentricity of the transverse area defined by the spatial distribution of produced gluons. The resulting elliptic flow is estimated to be about 6%, comparable to the value in nucleus-nucleus collisions at RHIC and the LHC. Experimentally, elliptic flow is inferred from the azimuthal correlation between hadrons, which receives contributions from collective flow, and from various other effects referred to as "nonflow". We discuss how to identify in experiments the signal of flow in the presence of large nonflow effects.
An Enhanced Communication Model
Per Flensburg
International Journal of Digital Accounting Research , 2009,
Abstract: The concept of information is often taken for more or less granted in research about information systems. This paper introduces a model starting with Shannon and Weaver data transmission model and ends with knowledge transfer between individual persons. The model is infact an enhanced communication model giving a framework for discussing problems in the communication process. A specific feature of the model is the aim for providing design guidelines in designing the communication process. The article ends with identifying a need for develop the model further to incorporate also communication within and between organisations of different kinds.
Maike Rotzoll, Marion Hulverscheidt (Hrsg): Nie geschehen. Schreiben über die Pest. Texte aus einem medizinhistorischen Lehrexperiment [Maike Rotzoll, Marion Hulverscheidt (Hrsg): Nie geschehen. Schreiben über die Pest. Texte aus einem medizinhistorischen Lehrexperiment]
Krug, Christoffer
GMS Zeitschrift für Medizinische Ausbildung , 2012, DOI: 10.3205/zma000822
Multilepton and multiphoton signatures of supersymmetry at the LHC
Christoffer Petersson
Physics , 2014,
Abstract: Motivated by the absence of any clear signal of physics beyond the Standard Model at the LHC after Run I, we discuss one possible slight hint of new physics and one non-minimal extension of the Standard Model. In the first part we provide a tentative explanation of a small excess of multilepton events, observed by the CMS collaboration, by means of a simplified model of gauge mediated supersymmetry breaking. In the second part we discuss how the standard phenomenology of gauge mediation can be significantly modified if one makes the non-minimal assumption that supersymmetry is broken in more than one hidden sector. Such multiple hidden sector models involve light neutral fermions called pseudo-goldstini and, due to the extra decay steps they induce, where soft photons are emitted, these models give rise to multiphoton plus missing energy signatures. We discuss why the existing LHC searches are poorly sensitive to these model and we propose new searches designed to probe them.
Disappearing charged tracks in association with displaced leptons from supersymmetry
Christoffer Petersson
Physics , 2014,
Abstract: In this note we discuss a characteristic collider signature of models of gauge mediated supersymmetry breaking in which the selectron and smuon are mass-degenerate co-NLSP. In these models, all processes involving superpartners give rise to two NLSP selectrons or smuons, each of which subsequently decays to a nearly massless LSP gravitino and an electron or a muon. In a large region of the parameter space, the NLSPs travel macroscopic distances, of the order 0.1-1000 mm, before they decay. Hence, these models give rise to collider signatures involving charged tracks that end at vertices, which are inside the detector volume but displaced with respect to the original collision point, from which an electron or a muon is emitted. In order to probe this class of models we propose a search for disappearing charged tracks in association with displaced electrons or muons.
Abstraction of Dynamical Systems by Timed Automata
Rafael Wisniewski,Christoffer Sloth
Modeling, Identification and Control , 2011, DOI: 10.4173/mic.2011.2.3
Abstract: To enable formal verification of a dynamical system, given by a set of differential equations, it is abstracted by a finite state model. This allows for application of methods for model checking. Consequently, it opens the possibility of carrying out the verification of reachability and timing requirements, which by classical control methods is impossible. We put forward a method for abstracting dynamical systems, where level sets of Lyapunov functions are used to generate the partitioning of the state space. We propose to partition the state space using an entire family of functions. The properties of these functions ensure that the discrete model captures the behaviors of a dynamical system by generating appropriate equivalence classes of the states. These equivalence classes make up the partition of the state space.
The Father on Display: The House of Jean Monnet and the Construction of European Identity
Christoffer K?lvraa
Culture Unbound : Journal of Current Cultural Research , 2012,
Abstract: In the 1980s, the EC engaged in trying actively to construct a European identity, primarily through a ‘manufacturing of symbols', such as a common flag, hymn and day of celebration. A lesser-known element of this symbolic construction was the elevation of the recently deceased Jean Monnet to a position as the undisputed ‘founding father’ of Europe. The 'sanctification' of Monnet culminated in the con-version of his house – purchased by the European Parliament – into a museum of his deeds and of the European project that they served. This article seeks to ana-lyse the construction of Monnet as a founding father for EUrope, first by investi-gating the context of the acquisition of his house and the establishment of the mu-seum in the 1980s, and subsequently by analysing the present exhibition in it.
Thyasira ockelmanni (Mollusca: Bivalvia: Veneroidea), A new species of Thyasiridae from the Norwegian Sea
Rozemarijn Keuning,Christoffer Schander
Fauna Norvegica , 2010, DOI: 10.5324/fn.v30i0.640
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