821 research outputs found
Comment on the Updated CDF "Ghost" Events
In 2008 the CDF Collaboration announced the discovery of an excess of events
with two or more muons, dubbed "ghost" events for their unusual properties. In
a recent update, CDF finds that the azimuthal angle distribution between the
primary (trigger) muons is significantly more back-to-back than that of all
known sources of di-muon backgrounds. Here we show that this angular
distribution cannot be reproduced in models where the muons are produced in the
decays of relatively light X-particles: all models of this kind also predict a
much broader distribution than that found by CDF. We conclude that the CDF
measurement cannot be described via the annihilation of strongly interacting
partons, and thus seems to be in conflict with basic tenets of QCD.Comment: 5 pages, 3 figure
Determination of the CMSSM Parameters using Neural Networks
In most (weakly interacting) extensions of the Standard Model the relation
mapping the parameter values onto experimentally measurable quantities can be
computed (with some uncertainties), but the inverse relation is usually not
known. In this paper we demonstrate the ability of artificial neural networks
to find this unknown relation, by determining the unknown parameters of the
constrained minimal supersymmetric extension of the Standard Model (CMSSM) from
quantities that can be measured at the LHC. We expect that the method works
also for many other new physics models. We compare its performance with the
results of a straightforward \chi^2 minimization. We simulate LHC signals at a
center of mass energy of 14 TeV at the hadron level. In this proof-of-concept
study we do not explicitly simulate Standard Model backgrounds, but apply cuts
that have been shown to enhance the signal-to-background ratio. We analyze four
different benchmark points that lie just beyond current lower limits on
superparticle masses, each of which leads to around 1000 events after cuts for
an integrated luminosity of 10 fb^{-1}. We use up to 84 observables, most of
which are counting observables; we do not attempt to directly reconstruct
(differences of) masses from kinematic edges or kinks of distributions. We
nevertheless find that m_0 and m_{1/2} can be determined reliably, with errors
as small as 1% in some cases. With 500 fb^{-1} of data tan\beta as well as A_0
can also be determined quite accurately. For comparable computational effort
the \chi^2 minimization yielded much worse results.Comment: 46 pages, 10 figures, 4 tables; added short paragraph in Section 5
about the goodness of the fit, version to appear in Phys. Rev.
The Passage of Ultrarelativistic Neutralinos through the Matter of the Moon
I consider the prospect to use the outer layer of the Moon as a detector
volume for ultra-high energy (UHE) neutrino fluxes and the flux of the lightest
neutralino which I assume is the lightest supersymmetric particle (LSP). For
this purpose, I calculate the event rates of these fluxes for top-down
scenarios. I show that a suitable experiment for the detection of radio waves
might be able to detect sufficient event rates after a measurement period of
one year.Comment: 3 pages, 1 figure, to appear in the proceedings of 16th International
Conference on Supersymmetry and the Unification of Fundamental Interactions
(SUSY08), Seoul, Korea, June 16-21 200
About its emancipatory function and the status of interpretation in critical psychoanalysis
Indexación: Web of Science; ScieloEl psicoanálisis es una práctica plural, múltiple y abierta. Su diálogo con otras disciplinas no solamente constituye una contribución relevante al debate público contemporáneo, sino que se torna en exigencia indispensable en cuanto a su devenir como discurso interesado en librarse de la tutela o servidumbre con respecto a los saberes establecidos.
En este artículo se aborda el ejercicio del psicoanálisis ligado a la práctica crítica en su sentido estricto, función crítica asociada a la correspondiente concepción de interpretación y a la práctica interpretativa que se vuelve posible a partir de ella. En la medida en que la interpretación se pretenda reveladora, conlleva la necesidad de problematizar las relaciones de poder que la condicionan y contextualizan, por lo mismo, en este análisis se postula que una ética psicoanalítica debe considerar estos elementos en la medida en que quiera efectuar una contribución al debate contemporáneo y, en particular, al proyecto emancipador del cual forma parte.Psychoanalysis is a plural, multiple and open practice. Its dialogue with other disciplines not only constitutes a relevant contribution to the present public debate, but is an indispensable exigency towards its own future as a discourse interested in getting rid of the trusteeship or servitude of established knowledge.
In that sense, the exercise of psychoanalysis is bound to the critical practice in its strict sense. This critical function is associated to the corresponding conception of interpretation and the respective interpretative practice. Interpretation, insofar as it pretends to be truly revealing, entails the necessity to promote a judicious analysis of the relations of power that condition and contextualize it. A psychoanalytical ethics must consider these elements if it wants to make a contribution to the contemporary debate and particularly to the emancipatory project of which it is part.http://ref.scielo.org/54gcr
Das unheimliche. Presencia e incidencia de lo ominoso en el pensamiento de Freud y Foucault a propósito del problema de la interpretación y sus consecuencias para la conceptualización del sujeto.
Indexación: Revista UNABLo Ominoso es un concepto presente tanto en la obra escrita de Sigmund Freud como de Michel Foucault, susceptible de ser relacionado con una serie de conceptos «fundamentales», arraigados en las respectivas formulaciones teóricas. El presente trabajo, a partir de la consideración del concepto de interpretación, analiza sus consecuencias para la constitución subjetiva y el lugar en el cual el sujeto resultante queda ubicado con respecto al lenguaje.The Uncanny is a so much present concept in Sigmund Freud's written works as of Michel Foucault's, susceptible to be related to a series of so-called «fundamentabconcepts. established in the respective theoretical formulations. The present article, starting frorn the consideration of the concept of interpretation, analyzes its consequences for the subjective constitution and the place in which the resultant subject remains located with respect to language
Prospects for Indirect Detection of Sneutrino Dark Matter with IceCube
We investigate the prospects for indirect detection of right-handed sneutrino
dark matter at the IceCube neutrino telescope in a extension of
the MSSM. The capture and annihilation of sneutrinos inside the Sun reach
equilibrium, and the flux of produced neutrinos is governed by the
sneutrino-proton elastic scattering cross section, which has an upper bound of
pb from the mass limits in the model.
Despite the absence of any spin-dependent contribution, the muon event rates
predicted by this model can be detected at IceCube since sneutrinos mainly
annihilate into leptonic final states by virtue of the fermion charges.
These subsequently decay to neutrinos with 100% efficiency. The Earth muon
event rates are too small to be detected for the standard halo model
irrespective of an enhanced sneutrino annihilation cross section that can
explain the recent PAMELA data. For modified velocity distributions, the Earth
muon events increase substantially and can be greater than the IceCube
detection threshold of 12 events .
However, this only leads to a mild increase of about 30% for the Sun muon
events. The number of muon events from the Sun can be as large as roughly 100
events for this model.Comment: 13 pages, 9 figures, replaced to match the published version, only
minor changes: addition of one reference in section 5, correction of two
typo
Fragments: On Violence
Indexación: Web of Science; Scielo.La violencia es un fenómeno ubicuo, cambiante y polimorfo. Su análisis requiere de una metodología plural, capaz de dar cuenta de sus singularidades. Se exploran las relaciones entre la violencia, el orden y la ley, con especial consideración de sus vínculos con el lenguaje y la lengua.Violence is an ubiquitous, changing and polymorphic phenomenon. Its analysis requires a plural methodology, that reflects their peculiarities. The relationship between violence, law and order, with special consideration of the links towards language and tongues are explored.http://ref.scielo.org/znzgy
Some considerations on violence. “Beyond” words
Indexación: Web of Science; ScieloResumen
La violencia es un fenómeno contemporáneo, complejo y sobredeterminado. Su comprensión
requiere un abordaje múltiple y transdisciplinario, en el que se combinen
diferentes epistemes. Se aborda el problema de la violencia principalmente a partir de
tres ejes: Primero, su relación con el lenguaje en general y con la etimología en particular.
Segundo, su relación con la ley o el ámbito del Derecho. Tercero, su relación con el
sujeto, respectivamente, con las teorías del sujeto. Finalmente, se plantea la necesidad y
las dificultades de pensar en una alternativa cualitativamente diferente a una sociedad
violenta.Abstract
Violence is a contemporary, complex and overdetermined phenomenon. Its understanding
requires a multi- and transdisciplinary approach, which combines several
epistemes. The problem of violence is analyzed following three axes: First, its relationship
to language in general and in particular to etymology. Second, its relationship to
law or the area of law. Third, its relationship to the subject, respectively, to the theories
of the subject. Finally, the necessity and difficulty of a qualitatively different alternative
to a violent society is brought up.http://ref.scielo.org/5fkh8
¿MODERNIDAD HOLOCAUSTO?
Indexación: Web of Science; ScieloEl Holocausto a lo largo de las últimas décadas ha dado lugar a una serie de interpretaciones, en las cuales convergen disciplinas como la historiografía, la sociología, las ciencias políticas, la psicología, el psicoanálisis, etc. A través de la paulatina consolidación del correspondiente “conflicto de las interpretaciones” (Ricœur, 2003) se ha convertido en un punto nodal y sobredeterminado del debate contemporáneo. Entre los diferentes abordajes del Holocausto destaca una corriente que relaciona, de un modo por precisar, Holocausto con Modernidad. Dicha relación será revisada, al menos en algunos de sus aspectos, interrogándose sobre su exactitud y pertinencia
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