109,661 research outputs found
New Physics at the LHC. A Les Houches Report: Physics at TeV Colliders 2009 - New Physics Working Group
No full textAnalysis of pion production data measured by HADES in proton-proton collisions at 1.25 GeV
No full textBaryon resonance production in proton-proton collisions at a kinetic beam energy of 1.25GeV is investigated. The multi-differential data were measured by the HADES Collaboration. Exclusive channels with one pion in the final state (npπ+ and ppπ0 were put to extended studies based on various observables in the framework of a one-pion exchange model and with solutions obtained within the framework of a partial wave analysis (PWA) of the Bonn-Gatchina group. The results of the PWA confirm the dominant contribution of the Δ(1232), yet with a sizable impact of the N (1440) and non-resonant partial waves
Les Houches 2013: Physics at TeV Colliders: New Physics Working Group Report
No full textWe present the activities of the "New Physics" working group for the "Physics at TeV Colliders" workshop (Les Houches, France, 3--21 June, 2013). Our report includes new computational tool developments, studies of the implications of the Higgs boson discovery on new physics, important signatures for searches for natural new physics at the LHC, new studies of flavour aspects of new physics, and assessments of the interplay between direct dark matter searches and the LHC
Muon g-2 and dark matter suggest nonuniversal gaugino masses: SU (5)×A4 case study at the LHC
No full textWe argue that in order to account for the muon anomalous magnetic moment g-2, dark matter and LHC data, nonuniversal gaugino masses Mi at the high scale are required in the framework of the minimal supersymmetric standard model. We also need a right-handed smuon μR with a mass around 100 GeV, evading LHC searches due to the proximity of a neutralino χ10 several GeV lighter which allows successful dark matter. We discuss such a scenario in the framework of an SU(5) grand unified theory (GUT) combined with A4 family symmetry, where the three 5 representations form a single triplet of A4 with a unified soft mass mF, while the three 10 representations are singlets of A4 with independent soft masses mT1,mT2,mT3. Although mT2 (and hence μR) may be light, the muon g-2 and relic density also requires light M1≃250 GeV, which is incompatible with universal gaugino masses due to LHC constraints on M2 and M3 arising from gaugino searches. After showing that universal gaugino masses M1/2 at the GUT scale are excluded by gluino searches, we provide a series of benchmarks which show that while M1=M2≪M3 is in tension with 8 and 13 TeV LHC data, M1<M2≪M3 is currently allowed. Even this scenario is almost excluded by the tension between the muon g-2, relic density, dark matter direct detection and LHC data. We focus on a region of parameter space that has not been studied in detail before being characterized by low Higgsino mass μ≈-300 GeV, as required by the muon g-2. The LHC will be able to fully test this scenario with the upgraded luminosity via muon-dominated tri- and dilepton signatures resulting from Higgsino-dominated χ1±χ20 and χ1+χ1- production.</p
Observation of J/ψ-pair production in pp collisions at √s=7 TeV
No full textThe production of J/ψ pairs in proton–proton collisions at a centre-of-mass energy of 7 TeV has been observed using an integrated luminosity of 37.5 pb−1 collected with the LHCb detector. The production cross-section for pairs with both J/ψ in the rapidity range 2 < yJ/ψ < 4.5 and transverse momentum pJ/ψ T <10 GeV/c is σJ/ψJ/ψ =5.1±1.0±1.1 nb, where the first uncertainty is statistical and the second systematic
Bibliographie Hilarion G. Petzold 1958 – 2009 mit Anhang als Einführung
No full textDieses Archiv enthält die Gesamtbibliographie der Werke des Autors nebst einiger Texte „Über H. G. Petzold“ im Schlussteil der Bibliographie sowie einen Anhang mit einer Einführung in die Architektur des Werkes in seinem wissenslogischen Aufbau als Ausarbeitung seines „Tree of Science Modells“ (2007).This archive contains the complete bibliography of the author and some texts about H. G. Petzold, moreover an epilogue with an introduction to the architecture of the works in its epistemological structure and composition and as an elaborations of Petzold’s „Tree of Science Modell (2007).https://www.fpi-publikation.de/polyloge/01-2009-petzold-h-g-gesamtbibliographie-h-g-petzold-1958-2009-updating-november2009/peerReviewedpublishedVersio
The approaches of Russian orientalists E. A. Belyaev, I. M. Filshtinsky and O. G. Bolshakov to the Umayyad caliphs
No full textDoktora TeziEmevîler dönemi, İslâm tarihinin önemli safhalarından biridir. Hz. Peygamber ve Hulefâ-i Râşidîn devrine özgü olan seçim esaslı yönetim anlayışından ilk olarak Emevîler vazgeçmiş, hilâfeti saltanata dönüştürmeleri sebebiyle yönetimleri tartışma konusu oluşmuştur. Emevîler hakkında mevcut bilgilerin büyük ölçüde Abbâsî dönemi müellifleri tarafından aktarılması, bu döneme dair önyargılı değerlendirmelerin ortaya çıkmasına yol açmıştır. Çağdaş araştırmalar, bu önyargılı yaklaşımın varlığını açıkça ortaya koymaktadır. Benzer şekilde Rus oryantalizminin de Emevîler üzerine yapılan çalışmalara özel dikkat gösterdiği görülmektedir. Bu çalışmada, Rus oryantalistlerin Emevî halifelerine dair yaklaşımları incelenmiştir. Araştırma giriş ve üç bölümden oluşmaktadır. Giriş bölümünde, Rus oryantalizminin oluşumu ve gelişimi ele alınmış, Rus oryantalistleri E. A. Belyaev, I. M. Filshtinsky ve O. G. Bolshakov hakkında genel bilgiler verilmiştir. Birinci bölümde, adı geçen üç Rus oryantalistin Emevî Devleti’nin kuruluşuna, Süfyânîler dönemine ve Süfyânî iktidarının sona ermesine dair görüşleri incelenmiştir. İkinci bölümde, Emevîler’in yükseliş devri çerçevesinde Abdülmelik b. Mervân ve Velîd b. Abdülmelik’e dair değerlendirmelerine yer verilmiştir. Üçüncü bölümde ise Emevîler’in Velîd b. Abdülmelik’ten sonraki dönemleri ve yıkılışına ilişkin görüşleri ele alınmıştır.The Umayyad period represents one of the most significant phases in Islamic history. The Umayyads were the first to abandon the election-based system of governance characteristic of the Prophet and the Rightly Guided Caliphs, transforming the caliphate into a hereditary monarchy. This transformation has been the subject of considerable debate. Since much of the information on the Umayyads was transmitted by Abbasid-era authors, historical assessments of this period often bear traces of bias, a tendency also evident in modern scholarship. Russian orientalism, in particular, has devoted special attention to the study of the Umayyads. This thesis examines the approaches of Russian orientalists toward the Umayyad caliphs. The research is structured into an introduction and three main chapters. The introduction discusses the formation and development of Russian orientalism and provides general information about E. A. Belyaev, I. M. Filshtinsky and O. G. Bolshakov. The first chapter analyzes the views of Russian orientalists on the establishment of the Umayyad State, the Sufyanid period, and the end of Sufyanid rule. The second chapter focuses on the rise of Umayyad power, with particular attention to Abd al-Malik b. Marwan and Walid b. Abd al-Malik. The third chapter explores perspectives on the later Umayyad period following Walid b. Abd al-Malik and the eventual downfall of the dynasty
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Rapport VIb.5. Méthode de simulation des écosystèmes marins ; effets des rejets sur la dynamique de ces derniers
No full textDeterministic mathematical model, applicable to the investigation of discharges into the sea (Pichot and Runfol 1975). Description of the dissolved nutrients, phgtoplancton-zooplancton and dissolved organic matters evolution ; limits of deterministic models. Statement on Belyaev’s method for the marine ecosystems simulation, that substitutes a qualitative and probabilistic discreet description for the quantitative continuous solutions of deterministic models.Modèle mathématique déterministe applicable à l’étude des rejets en mer (Pichot et Runfola, 1975) ; description de l’évolution des nutrients dissous, du phytoplancton, du zooplancton et des matières organiques dissoutes ; limitation des modèles déterministes. Exposé de la méthode de Belyaev pour la simulation des écosystèmes marins ; elle substitue aux solutions continues quantitatives des modèles déterministes, une description discrète qualitative et probabiliste.Belyaev Vladimir, Pichot G. Rapport VIb.5. Méthode de simulation des écosystèmes marins ; effets des rejets sur la dynamique de ces derniers. In: La mécanique des fluides et l'environnement. Prévision et maîtrise de la qualité de l'eau et de l'air. Compte rendu des quatorzièmes journées de l'hydraulique. Paris, 7-9 septembre 1976. Tome 2, 1977
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