1,915 research outputs found
Measurement of the Differential Production Cross Section of W Bosons and Charge Asymmetry at �s = 7 TeV with the ATLAS Detector
No full textThis document presents a measurement of the production cross section of W
bosons and of its charge asymmetry in proton-proton collisions at a centre of mass energy of 7 TeV with the ATLAS detector. These measurements provide information on the momentum fraction of the protons carried by the partons contributing to the W production and therefore allow to better understand the parton distribution functions of the proton.
The W candidate events are selected in the W�enu decay mode. The LAr electromagnetic calorimeter plays an important role in the detection of electrons and the author has worked on the on-line energy reconstruction in the LAr detectors. A subject which is treated in some detail is the evaluation of the charge misidentification rates for electrons and positrons. This is a key ingredient for charge related measurements such as the W charge asymmetry.
In this document, the W production cross section times the branching ratio is studied inclusively, as a function of the lepton pseudorapidity and as a double differential measurement as a function of the lepton pseudorapidity and transverse energy. The charge asymmetry measurement is presented as a function of the lepton pseudorapidity and as a double differential measurement as well. The data were recorded by the ATLAS detector in 2011 and correspond to 4.7 fb�1
Heavy Particle Towers and Nonlocal QFT
No full textA number of gravitation-motivated theories, as well as theories with new
coloured fermions predict heavy particle towers with spectral densities
growing faster than , a characteristic of nonlocalizable
theories. It is shown that if a light scalar, like the Higgs boson, interacts
strongly with a heavy scalar particle tower with exponentially rising
degeneracy, then the local low-energy theory is equivalent to an effective
nonlocal scalar QFT. For energies approaching the nonlocality scale
, the scalar propagator and scattering amplitudes are
modified by nonlocal factors of the form . The
double-Higgs production measurement at the LHC is proposed as a highly
sensitive probe of nonlocality at the electroweak scale.Comment: 8 pages, 1 figur
“EX PAGANIS CHRISTIANOS ESSE PATRAVIT”: КОГО ВІДПРАВИВСЯ ХРИСТИЯНІЗУВАТИ НІТРАНСЬКИЙ ЄПИСКОП ВІХІНГ?
No full textThe article is dedicated to the problem of determination of geographical frames of the missionary activity of Wiching, the Bishop of Nitra, after his ordination in Rome by the Pope John VIII in 880. Based on the cross-analysis of the hagiographical texts, epistolary sources and other narratives of the late 9th – the first half of the 10th century, as well as some individual archaeological evidences, the author tries to reconstruct the nature of the church-political relations between the state of the Great Moravian prince Sviatopluk and the neighboring gentes in the last quarter of the 9th century and to determine, who was that “neophita gens” (mentioned in the letter of the Bavarian episcopate to the Pope John IX) to whom, by the will of Sviatopluk and the Pope John VIII, the newly ordained Bishop Wiching went on a mission. Despite the fact that the population of the territories, newly conquered or incorporated by the Great Moravian prince, was not always pagan or neophyte, Sviatopluk’s expansionist policy of the outlined period was mainly accompanied by Christianization or evangelistic missions conducted by the clergy from the Moravian archdiocese of Methodius and his suffragans. To achieve this goal the Great Moravian ruler, with the direct support of the papacy, initiated the process of institutionalization of church and religious centers, whose task was to convert the population of the newly conquered territories. Among such ecclesiastical structures the Diocese of Nitra, headed by Wiching, the suffragan of the Archbishop Methodius, was founded. The author comes to conclusion, that the mission of the last one in the first years after receiving the episcopal rank in Rome in 880 was directed to the lands of the Tysa basin, conquered by Sviatopluk around 881/882 and perfectly fit into the context of the expansionist policy of the Greater Moravian ruler.
Keywords: The Diocese of Nitra, the Bavarian episcopate, Wiching, “neophita gens”, the Bulgarians, the Tysa River basin.Стаття присвячена проблемі визначення географічних меж місіонерської діяльності нітранського єпископа Віхінга після його висвячення у Римі папою Іоаном VIII у 880 р. Шляхом перехресного аналізу агіографічних текстів, епістолярних джерел та інших наративів кінця ІХ – першої половини Х ст., а також окремих археологічних пам’яток автор намагається реконструювати харатер церковно-політичних взаємин держави великоморавського князя Святоплука останньої чверті ІХ ст. із сусідніми gentes і визначити, ким був згаданий у листі баварського єпископату до папи Іоана ІХ “neophita gens”, до котрого, з волі Святоплука та папи Іоана VIII, відправився з місією нововисвячений єпископ Віхінг. Незважаючи на те, що населення новозавойованих чи інкорпорованих великоморавським князем територій не завжди було язичницьким чи неофітським, експансійна політика Святоплука зазначеного періоду переважно супроводжувалася християнізаційними, або ж євангелізаційними місіями духівництва з моравського архієпископства Мефодія та його суфраганів, одним з яких і був нітранський єпископ Віхінг. Автор приходить до висновку, що місія останнього у перші роки після отримання єпископського сану у Римі у 880 р. скеровувалася на землі Потисся, завойованого Святоплуком близько 881/882 р. і цілком вписувалася у контекст експансійної політики правителя Великої Моравії.
Ключові слова: Нітранське єпископство, баварський єпископат, Віхінг, “neophita gens”, болгари, Потисся
Author Correction: A portrait of the Higgs boson by the CMS experiment ten years after the discovery
No full textIn the version of this article initially published, CMS Collaboration author names, affiliations and acknowledgements were omitted and have now been included in the HTML and PDF versions of the articl
Search for a CP-odd Higgs boson decaying to Zh in pp collisions at root s=8 TeV with the ATLAS detector
No full textSee paper for full list of authors – 13 pages plus author list + cover pages (30 pages total), 5 figures, 2 tables, submitted to Phys. Lett. B, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-06/International audienceA search for a heavy, CP-odd Higgs boson, , decaying into a boson and a 125 GeV Higgs boson, , with the ATLAS detector at the LHC is presented. The search uses proton--proton collision data at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3 fb. Decays of CP-even bosons to or pairs with the boson decaying to electron or muon pairs are considered, as well as decays with the boson decaying to neutrinos. No evidence for the production of an boson in these channels is found and the 95% confidence level upper limits derived for \sigma (gg\rightarrow A) \times \mbox{BR}(A \rightarrow Zh) \times \mbox{BR}(h \rightarrow f\bar{f}) are 0.098--0.013 pb for and 0.57--0.014 pb for in a range of 220--1000 GeV. The results are combined and interpreted in the context of two-Higgs doublet models
Modellierung ultrarelativistischer Schwerionenkollisionen mit der Quark-Molekulardynamik qMD
No full textThis thesis presents a model for the dynamical description of deconfined quark matter created in ultra-relativistic heavy ion collisions, treating quarks and antiquarks as classical point particles subject to a colour-dependent, Cornell-type potential interaction. The model provides a dynamical handle for hadronization via the recombination of quarks and antiquarks in colour neutral clusters. Gluons are not included explicitly in the model,but are described in an effective manner by the means of the potential interaction. The model includes four different quark flavours (up, down, strange and charm) and uses current masses for the quarks. The dynamical evolution of a system of colour charges subject to the Hamiltonian equations of motion of the model yields the formation of colour neutral clusters of quarks and antiquarks, which are subject only to a small remaining interaction, the strong interquark potential notwithstanding. These clusters can be mapped onto hadrons and hadronic resonances. Thus, the model allows a dynamical description of quarks degrees of freedom in heavy ion collisions, including a recombination scheme for hadronization. The thermal properties of the model turn pout to be very satisfying. The model shows a transition from a confining phase to a deconfined phase with rising temperature, going hand in hand with a softest point in the equation of state and a rise of energy density and pressure to the Stefan-Boltzmann limit of a gas of quarks and antiquarks. Moreover, the potential interaction is screened in the deconfined phase. For the dynamical description of ultra-relativistic heavy ion collision, the qMD model is coupled to UrQMD as a generator for its initial conditions. In this way, a fully dynamical description of the expansion and hadronization of the fireball created in such collisions can be achieved. Non-equilibrium aspects of the expansion dynamics and hadronization by recombination of quarks and antiquarks are discussed in detail, and a comparison with experimental data of collisions at the CERN-SPS is presented. The big advantage of the qMD model is the possibility to study cluster formation, including exotic clusters, and fluctuations in a dynamical manner. As an example, event-by-event fluctuations in electric charge are studied. Such fluctuations have been proposed as a clear criterion to distinguish a deconfined system from a hadrons gas. However, experimental data show hadron gas fluctuation measures even at RHIC, where deconfinement is taken for granted. We will see how the dynamics of quark recombination washes out the quark-gluon plasma signal in the fluctuation criterion. Moreover, we will discuss briefly the problem of entropy at recombination. In a second application, the formation of exotic hadronic clusters, larger than usual mesons and baryons, is studied. Such clusters could provide new measures for the thermalization and homogenization of a deconfined gas of colour charges. Moreover, number estimates for exotic clusters from recombination are considerably lower than corresponding predictions from thermal models, providing a clear difference between statistical hadronization and hadronization via quark recombination. A detailed analysis is provided for pentaquark candidates such as the Theta-Plus. It turns out that the distribution of exotic states over strangeness, isospin, and spin could provide a sensitive measure for thermalization and decorrelation in the deconfined quark phase, if it could be measured.Diese Arbeit behandelt das molekulardynamische Simulationsmodell qMD (Quark-Molekulardynamik), das im Zusammenhang mit der Untersuchung der Hadronisierung eines Quark-Gluon-Plasmas zur Berücksichtigung des Farbfreiheitsgrades der elementaren Materie verwendet wird. Das qMD-Modell leistet eine dynamische Beschreibung der Bildung von Hadronen über die Rekombination von Quarks und Antiquarks. In der Quark-Molekulardynamik qMD werden Quarks und Antiquarks als klassische, relativistische Punktteilchen behandelt, die eine Farbladung tragen und über ein langreichweitiges Cornell-Potential wechselwirken. Diese Potentialwechselwirkung trägt den Gluonfreiheitsgraden Rechnung: Gluonen werden nicht explizit als Teilchen behandelt. Es werden vier verschiedene Quarkflavours (up, down, strange und charm) mit ihren Strommassen berücksichtigt. Es zeigt sich, daß die dynamische Entwicklung eines Systems von Farbladungen zur Ausbildung farbneutraler Cluster führt. Diese unterliegen trotz der enormen Stärke der Farbpaarpotentiale einer nur noch sehr schwachen Restwechselwirkung und können daher als Hadronen angesehen werden. Hadronisierung kann dann dynamisch beschrieben werden, indem jedem farbneutralen Cluster ein Hadron oder eine hadronische Resonanz zugeordnet wird. Im thermischen Gleichgewicht weist das qMD-Modell einen Übergang zwischen einer Phase mit Clusterbildung und Farbeinschluß bei tiefen Temperaturen und einer Phase frei beweglicher Farbladungen bei hohen Temperaturen und/oder Dichten auf, wie er von stark wechselwirkender Materie erwartet wird. An diesem Übergang wird die Zustandsgleichung weich, während Energiedichte und Druck der frei beweglichen Farbladungen ansteigen und sich bei hohen Temperaturen dem Stefan-Boltzmann-Grenzwert eines idealen Gases annähern. Es folgt die Anwendung des qMD-Modells auf die Beschreibung ultrarelativistischer Schwerionenkollisionen. Der Anfangszustand für die Quarkdynamik wird dabei durch das hadronische Transportmodell UrQMD bereitgestellt. Das so initialisierte Gas von Farbladungen expandiert und bildet farbneutrale Cluster, die auf Hadronen abgebildet werden. Das qMD-Modell erlaubt einen vollen Zugriff auf die dreidimensionale raumzeitliche Entwicklung des Systems einschließlich der vollständigen Phasenraumverteilungen. Es zeigt sich, daß die dabei ablaufenden dynamischen Prozesse im allgemeinen nicht dem thermischen Gleichgewicht folgen. Ein Vergleich von Resultaten der qMD-Simulationen mit Meßdaten für Schwefel-Gold-Kollisionen belegt, daß das qMD-Modell Phasenraumverteilungen der Hadronen im Endzustand der Kollision sehr gut wiedergibt. Die wirkliche Stärke des qMD-Modells liegt in dem Zugriff auf die Dynamik der Quark- und Antiquarkfreiheitsgrade. Es eignet sich daher hervorragend zur Untersuchung von Fluktuationen in der Quarkphase und deren Schicksal während der Hadronisierung sowie zur dynamischen Beschreibung der Bildung farbneutraler Cluster, einschließlich sogenannter exotischer hadronischer Zustände. So wird das Problem der ereignisweisen Fluktuationen der elektrischen Ladung als Nachweiskriterium für das Quark-Gluon-Plasma im Rahmen von qMD behandelt. Es zeigt sich, daß die Hadronisierung auf dem Wege der Clusterbildung und Rekombination Fluktuationssignale auslöscht, die eigentlich für ein Quark-Gluon-Plasma erwartet werden. Dies deckt sich mit dem experimentellen Befund, daß auch bei höchsten Energien wider Erwarten anhand der Ladungsfluktuationen kein Hinweis auf die Quarkphase drittelzahliger Ladungen gefunden werden konnte. Das Thema exotischer Hadronen hat durch den kürzlichen, wenn auch strittigen Nachweis des Pentaquark-Zustandes Theta-Plus großes Interesse erfahren. Ausgehend von der Idee, daß die Hadronisierung eines Quark-Gluon-Plasmas durch die Rekombination von farbneutralen Clustern ein günstiges Umfeld für die Entstehung solcher höherer Multiplett-Zustände liefert, wird die Bildung von Clustern aus bis zu sechs Quarks oder Antiquarks untersucht. Hieraus kann eine Abschätzung für die Zahl der zu erwartenden Zustände gewonnen werden. Die Verteilung der exotischen Zustände über Seltsamkeit, Isospin und Spin zeigt, daß diese, so sie denn meßbar wäre, einen empfindlichen Sensor für die Thermalisierung und den Verlust von Korrelationen in der Quark-Phase bereitstellen könnte
Grec 2087
No full textALEXANDER rhetor. De figuris sententiarum et elocutionisAMMONIUS, Hermiæ filius. Commentarius in Porphyrii isagogeANASTASIUS Sinaïta (S.). Excerpta et fragmentaARISTOTELES. ExcerptaBIBLE. Historia V. TestamentiCHRYSOMALLUS. De humilitatis necessitateCONSTANTINUS Manasses. ChroniconHERMOGENES. FragmentaMANUEL Comnenus. Encomium Manuelis ComneniPSELLUS (Michael). Commentarius in Canticum canticorumPSELLUS (Michael). De rebus theologicis, physicis et moralibusPSELLUS (Michael). Opuscula varia, theologica, physica, grammatica, etcTHEODORUS Prodromus. Encomia varia Manuelis Comneni et versus in eumTRYPHON grammaticus. De tropisNumérisation effectuée à partir d'un document de substitution.(1) Ammonii commentarius in Porphyrii isagogen ; — (67) S. Anastasii Sinaïtæ fragmentum ; — (68) Series imperatorum CP. a Constantino magno usque ad Andronicum seniorem, versibus ; — (68 v°) Series patriarcharum CP. usque ad Leonem Stypiotam ; — (69) Varia de zodiaco, luna, etc ; — (70 v°) De veris Dei adoratoribus responsio ; — (71) Michaelis Pselli de rebus theologicis, physicis et moralibus responsiones, cap. CCV ; — (120 v°) ejusdem solutio dubii a paganis circa necessitatem incarnationis Christi propositi ; — (122) Chrysomalli opusculum de humilitatis necessitate ; — (123) Anonymi chronicon breve e V. Testamento, usque ad Theodorum Lascarim : Τῷ πα ἔτει Μωσέως... ; — (126 v°) Versus de zodiaco ; — (127) Constantini Manassis chronicon, usque ad Nicephorum Botaniatam ; — (211 v°) Theodori Prodromi versus ad Manuelem Comnenum, adversus Persas proficiscentem ; — (217) ejusdem encomia varia Manuelis Comneni ; — (222) Michaelis Pselli commentarius in Canticum canticorum ; — (256) Tryphonis opusculum de tropis ; — (244) Hermogenis fragmenta ; — (247 v°) Alexandri opusculum de figuris sententiarum et elocutionis ; — (258) Aristotelis libri de anima excerptaFontebl.-Reg. 3089
Metodología para el diseño del programa de las asignaturas inglés IX e inglés X de quinto año de la carrera de medicina
No full textThis research starts from the problem observed in the development of the teaching-educational process in the subjects: "English Language IX and X" in 5th academic year of medical studies; which are parts of the cycles of English Language with specific purposes for medical students. The problem consists of teaching-learning methods and on the organizational ways of the subjects mentioned, which limit the achievement of the instructive objectives, since the medical graduates have difficulties practicing their profession in English language when they are abroad offering medical services. Through the application of several research scientific methods, the design of the syllabus could be analyzed, finding difficulties in the teaching-learning method, as well as in the development of special organizational ways of the teaching-educational process, that being appropriately used, the problem might be solved. The objective of the research was to design a methodology to draw up a syllabus to the teaching of these subjects with scientific bases following linguistic, psychological, pedagogical, sociological and philosophical theories that support the principles of such syllabus. The psycho-pedagogical theories used to support the design and the implications of this syllabus were also considered.Esta investigación parte del problema que se manifiesta en el desarrollo del proceso docente-educativo en las asignaturas Inglés IX e Inglés X correspondiente al quinto año de la carrera de Medicina y que forman parte del ciclo de idioma inglés con fines específicos en dicha carrera. El problema consiste en que el método de enseñanza-aprendizaje y las formas organizativas de las asignaturas antes mencionadas limitan el cumplimiento de los objetivos instructivos de las mismas, ya que los estudiantes egresados de nuestro centro presentan dificultades para ejercer su profesión en idioma inglés cuando prestan sus servicios asistenciales en el extranjero. Mediante la aplicación de varios métodos de investigación científica se pudo establecer que el diseño del programa de estas asignaturas presenta deficiencias al no utilizarse un método adecuado de enseñanza-aprendizaje, así como formas organizativas especiales del proceso docente-educativo en el desarrollo de este, que de ser utilizadas, darían solución al problema antes mencionado. El objetivo de la investigación realizada fue diseñar una metodología para la elaboración de un programa para la enseñanza de estas asignaturas, que estuviera fundamentado científicamente en teorías lingüísticas, psicológicas, pedagógicas, sociológicas y filosóficas de las que emanaran principios que sustentaran dicho programa. En el presente trabajo se presentan las teorías psicopedagógicas utilizadas para la fundamentación del diseño y las implicaciones que tienen para el mismo
- …
