3,945 research outputs found

    Two particle states, lepton mixing and oscillations

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    Discussions of lepton mixing and oscillations consider generally only flavor oscillations of neutrinos and neglect the accompanying charged leptons. In cases of experimental interest like pion or nuclear beta decay an oscillation pattern is expected indeed only for neutrinos if only one of the two produced particles is observed. We argue that flavor oscillations of neutrinos without detecting the accompanying lepton is a peculiarity of the two-particle states ∣lν>|l\nu> produced in pion or nuclear beta decay. Generally, an oscillation pattern is only found if both particles are detected. We discuss in a pedagogical way how this distinction of the neutrinos arises, although on the level of the Lagrangian lepton mixing does not single them out against charged leptons. As examples, we discuss the difference between the state ∣lν>|l\nu> produced by the decay of real WW boson and a WW originating from pion decay

    'Tracce'? L'"Alexandre" di Alberico da Besançon e il "Sirventese lombardesco" nel loro contesto manoscritto

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    This paper studies the role that two important Romance texts – Alberic de Besancon's Alexandre and the "Sirventese lombardesco" – play within their unique manuscript witnesses (respectively Firenze, Biblioteca Medicea Laurenziana, Pluteo 64.35 and Modena, Biblioteca Estense e Universitaria, γ.N.8.4.11-13). This specific point of view allows to better understand the meaning and the cultural significance that ancient readers gave to those texts, and it is also useful to better understand the phenomenon of adventitious transcriptions of Romance texts into Latin or vernacular manuscripts (with particular reference to the category of 'tracce')

    La lirica trobadorica nella Toscana del Duecento : canali e forme della diffusione

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    Coniugando i dati provenienti dallo studio della tradizione manoscritta a quelli desumibili dall\u2019analisi di testi particolarmente significativi, questo articolo traccia un profilo critico delle modalit\ue0 con le quali la tradizione manoscritta trobadorica si \ue8 diffusa in area toscana nel corso del Duecento. Si individua cos\ued un canale di accesso privilegiato alla regione attivo almeno dagli anni Sessanta del XIII secolo in corrispondenza dell\u2019asse Monferrato-Genova-Malaspina. In relazione a questo itinerario fondamentale si definiscono inoltre le tracce di tradizioni minoritarie e si individua un ancora pi\ufa antico sostrato di produzione trobadorica legata a quest\u2019area

    Jet and EtMiss Commissioning in ATLAS

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    A reliable reconstruction and calibration of jets and EtMiss in ATLAS is crucial to understand Standard Model Physics measurements and to discover new phenomena. In these slides it is described the step by step approach that ATLAS has adopted to reconstruct and calibrate jets and EtMiss to guarantee flexibility and robustness with first data. Main techniques are described to establish the energy scale "in-situ", which is the most challenging task forjets and EtMiss. Measuring jets and EtMiss is challenging but ATLAS has developped tools and strategies to be ready for commissioning with real collisions

    Determination of lipid requirements in black soldier fly through semi-purified diets

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    The insect market is still far from an effective upscale and, to achieve this goal, it is necessary to know the BSF dietary requirements for the production maximization. Worldwide, given the waste variability, is not always easy to identify the optimal waste-based mixture that can allow to reach the best production, in terms of quantity and quality. Due this reason, nutritional need ranges are the basic knowledge, affordable for everyone, to increase the profitability of the insect farming. The study aims to evaluate the effects of 6 semi-purified, isonitrogenous and isoenergetic diets (SPII) with increasing lipid levels (1%, L1; 1.5%, L1.5; 2.5%, L2.5; 3.5% L3.5; 4.5%, L4.5) on BSF life history traits (6 replicates/treatment and 100 larvae/replicate). The Gainesville diet was used as environmental control. Considering the whole larval stage, 4.5% lipid level guarantees better performance when compared to content lower than 2.5%. The L4.5 10-day-old larvae yielded greater when compared to the other dietary treatments. At 14 and 18 days of age, the larvae of the groups above 2.5% performed better than L1, while the L1.5 showed intermediate results. Lipid levels below 1.5% on DM, when compared to 4.5%, resulted in a smaller prepupa and pupa size. The results obtained on the adult stage do not allow the identification of a lipid levels ideal range, as in the larval stage. In conclusion, in the whole larval stage and in prepupae/pupae phases, lipid percentage lower than (or equal to) 1% have a negative effect on growth. Other research will be needed in order to evaluate lipid levels above 4.5% on DM

    HEP Applications Evaluation of the EDG Testbed and Middleware

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    Workpackage 8 of the European Datagrid project was formed in January 2001 with representatives from the four LHC experiments, and with experiment independent people from five of the six main EDG partners. In September 2002 WP8 was strengthened by the addition of effort from BaBar and D0. The original mandate of WP8 was, following the definition of short- and long-term requirements, to port experiment software to the EDG middleware and testbed environment. A major additional activity has been testing the basic functionality and performance of this environment. This paper reviews experiences and evaluations in the areas of job submission, data management, mass storage handling, information systems and monitoring. It also comments on the problems of remote debugging, the portability of code, and scaling problems with increasing numbers of jobs, sites and nodes. Reference is made to the pioneeering work of Atlas and CMS in integrating the use of the EDG Testbed into their data challenges. A forward look is made to essential software developments within EDG and to the necessary cooperation between EDG and LCG for the LCG prototype due in mid 2003.Comment: Talk from the 2003 Computing in High Energy and Nuclear Physics Conference (CHEP03), La Jolla, CA, USA, March 2003, 7 pages. PSN THCT00

    New constraints on supersymmetry using neutrino telescopes

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    We demonstrate that megaton-mass neutrino telescopes are able to observe the signal from long-lived particles beyond the Standard Model, in particular the stau, the supersymmetric partner of the tau lepton. Its signature is an excess of charged particle tracks with horizontal arrival directions and energy deposits between 0.1 and 1 TeV inside the detector. We exploit this previously-overlooked signature to search for stau particles in the publicly available IceCube data. The data shows no evidence of physics beyond the Standard Model. We derive a new lower limit on the stau mass of 320 GeV (95% C.L.) and estimate that this new approach, when applied to the full data set available to the IceCube collaboration, will reach word-leading sensitivity to the stau mass (m_{\tilde{t}} = 450GeV)

    Light from the Cosmic Frontier: Gamma-Ray Bursts

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    Gamma-Ray Bursts (GRBs) are the most powerful cosmic explosions since the Big Bang, and thus act as signposts throughout the distant Universe. Over the last 2 decades, these ultra-luminous cosmological explosions have been transformed from a mere curiosity to essential tools for the study of high-redshift stars and galaxies, early structure formation and the evolution of chemical elements. In the future, GRBs will likely provide a powerful probe of the epoch of reionisation of the Universe, constrain the properties of the first generation of stars, and play an important role in the revolution of multi-messenger astronomy by associating neutrinos or gravitational wave (GW) signals with GRBs. Here, we describe the next steps needed to advance the GRB field, as well as the potential of GRBs for studying the Early Universe and their role in the up-coming multi-messenger revolution.Comment: White paper submitted to ESA as a contribution to the deliberations on the science themes for the L2 and L3 mission opportunitie
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