1,946 research outputs found

    The simulation of the TOTEM inelastic telescopes in OSCAR

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    The simulation of the TOTEM inelastic telescopes T1 and T2 has been implemented in the CMS framework for the simulation OSCAR, which is based on the GEANT4 toolkit. The note describes the software packages which manage the detector simulation and which contain the geometry description. The simulation has been tested calculating the charged particle fluxes in both detectors

    TOTEM Experiment at the LHC: Status and Program

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    The TOTEM experiment (Total Cross Section Elastic Scattering and Diffraction Dissociation at the LHC) will measure the total p-p cross section at the LHC by measuring separately the elastic and inelastic rate. The TOTEM experimental apparatus accounts for two inelastic telescopes and two Roman Pot stations per side equipped with the leading proton detectors. The detectors will be placed in the forward region of CMS: the detectors of the two experiments, operated together, provide an unprecedented rapidity coverage at a hadron collider. A common program on forward physics with different LHC running scenarios is foreseen by the two collaborations; a brief description of the part concerning soft double Pomeron exchange processes is given in this article

    Dielectronic Recombination Rates In Astrophysical Plasmas

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    In this work we introduce a new expression of the plasma Dielecronic Recombination (DR) rate as a function of the temperature, derived assuming a small deformation of the Maxwell-Boltzmann distribution and containing corrective factors, in addition to the usual exponential behaviour, caused by non-linear effects in slightly non ideal plasmas. We then compare the calculated DR rates with the experimental DR fits in the low temperature region.Comment: 6 pages, 1 figure, proceedings to the "International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos - IX", 25-30 June 2006, CERN - Genev

    Measuring quantumness: from theory to observability in interferometric setups

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    We investigate the notion of quantumness based on the non-commutativity of the algebra of observables and introduce a measure of quantumness based on the mutual incompatibility of quantum states. We show that such a quantity can be experimentally measured with an interferometric setup and that, when an arbitrary bipartition of a given composite system is introduced, it detects the one-way quantum correlations restricted to one of the two subsystems. We finally show that, by combining only two projective measurements and carrying out the interference procedure, our measure becomes an efficient universal witness of quantum discord and non-classical correlations.Comment: 5 pages, 1 figur

    Simulation of diffractive and non-diffractive processes at the LHC energy with the PHYTHIA and PHOJET MC event generators

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    The predictions of the PYTHIA 6.205 and PHOJET 1.12 MC event generators for diffractive processes and minimum bias events are presented for the LHC energy. The comparison with the experimental data from the ISR, the SPS and the Tevatron is made

    Factores que condicionan la informalidad en las MYPES de abarrotes del Centro Poblado de Izcuchaca, distrito de Anta, Cusco 2019

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    Existe un flujo de actividades comerciales bastante din谩mico en el centro poblado de Izcuchaca, debido principalmente a su ubicaci贸n, donde se intersectan rutas comerciales que pasan por Abancay y Lima, es por eso que el crecimiento econ贸mico pasa desapercibido y es dif铆cil medirlo en su totalidad. Se opt贸 por observar las MYPES del sector abarrotes por ser uno de los rubros con menores barreras de ingreso y menor dificultar de establecimiento, y debido a eso es uno de los rubros que tiene a caer en la informalidad. El objetivo de esta investigaci贸n fue determinar qu茅 caracter铆sticas definen a este creciente sector de microempresas no reguladas y que trabas evitan que prospere el sector formal. Seg煤n la teor铆a, un sector informal se origina debido a las fricciones entre la legislaci贸n vigente y el sector empresarial, que no est谩 familiarizado con la misma, por lo tanto, se busc贸 estudiar el problema tanto desde la perspectiva de la poblaci贸n como desde la perspectiva del estado. Para entender el rol de ambas entidades en la problem谩tica informal, se determinaron variables que expliquen la realidad socio econ贸mico de los empresarios informales, as铆 como otras que expliquen las barreras de ingreso al sector formal. Posteriormente se cuantifico los porcentajes de mayor frecuencia en el an谩lisis de las diferentes variables con el fin de identificar las tendencias de comportamiento que tienen los agentes econ贸micos informales. Los resultados muestran que el acelerado crecimiento econ贸mico de la regi贸n ha generado una brecha de desentendimiento entre la poblaci贸n y la administraci贸n municipal, esto se debe principalmente a la falta de informaci贸n que manejan los empresarios con respecto a la formalizaci贸n de sus actividades, ya que gran parte de la poblaci贸n encuestada respondi贸 desconocer cuales son los tr谩mites requeridos para formalizar sus negocios y los costos que estos implican, por todo esto se considera la falta de informaci贸n como un factor muy relevante en la existencia del sector informal. Sin embargo, al momento de optar el funcionamiento informal tambi茅n entran en juego otros factores como las barreras burocr谩ticas, ya que la mayor铆a de la poblaci贸n encuestada respondi贸 que ve como inconveniente el tener que invertir d铆as h谩biles de trabajo para hacer seguimiento de los tramites que involucran obtener una licencia. De igual manera, el nivel educativo de los agentes econ贸micos representa un factor a considerarse en la aparici贸n de negocios informales pues se observ贸 que la poblaci贸n con estudios superiores universitarios tiene una tendencia frecuente a formalizar su negocio o por lo menos a considerar el tr谩mite como una necesidad para mejorar las condiciones de la microempresa

    CCD time-series photometry of the globular cluster NGC 5053: RR Lyrae, Blue Stragglers and SX Phoenicis stars revisited

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    We report the results of CCD VV, rr and II time-series photometry of the globular cluster NGC 5053. New times of maximum light are given for the eight known RR Lyrae stars in the field of our images and their periods are revised. Their VV light curves were Fourier decomposed to estimate their physical parameters. A discussion on the accuracy of the Fourier-based iron abundances, temperatures, masses and radii is given. New periods are found for the 5 known SX Phe stars and a critical discussion of their secular period changes is offered. The mean iron abundance for the RR Lyrae stars is found to be [Fe/H] 1.970.16\sim -1.97 \pm 0.16 and lower values are not supported by the present analysis. The absolute magnitude calibrations of the RR Lyrae stars yield an average true distance modulus of 16.120.0416.12 \pm 0.04 or a distance of 16.70.316.7 \pm 0.3 kpc. Comparison of the observational CMD with theoretical isochrones indicates an age of 12.52.012.5 \pm 2.0 Gyrs for the cluster. A careful identification of all reported Blue Stragglers (BS) and their V,IV,I magnitudes leads to the conclusion that BS12, BS22, BS23 and BS24 are not BS. On the other hand, three new BS are reported. Variability was found in seven BS, very likely of the SX Phe type in five of them, and in one red giant star. The new SX Phe stars follow established PLPL relationships and indicate a distance in agreement with the distance from the RR Lyrae stars.Comment: 21 pages, 16 figures, 11 tables. Accepted for publication in MNRA

    Triggering on Forward Physics

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    The feasibility is investigated of a dedicated trigger stream in the CMS trigger menu, with an output rate of cal O (1)~kHz on the First Level Trigger and cal O (1)~Hz on the High Level Trigger. By combining jet trigger information from the CMS calorimeter with information from the TOTEM Roman Pot detectors at 220 m distance from the interaction point, the default dijet trigger thresholds foreseen in the CMS trigger tables can be lowered substantially while respecting the CMS trigger bandwidth limits. The efficacy of the dedicated diffractive trigger stream is demonstrated for hard single-diffractive and double-Pomeron exchange events
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