1,721,476 research outputs found
Sapore di Giappone
No full textIl 2 marzo scorso per la prima volta sono stati iniettati e fatti circolare stabilmente dei fasci di elettroni e positroni nell’acceleratore SuperKEKB del laboratorio KEK di Tsukuba, ad una settantina di km da Tokyo. L’obiettivo del programma scienti co che verrà realizzato con il rivelatore Belle II, attualmente in costruzione, è la scoperta dei segnali sfuggenti delle particelle non contemplate dalla teoria del Modello Standard, cioè la“nuova sica”. In questo articolo si cercano di sintetizzare gli obiettivi dell’esperimento e le sue caratteristiche costruttive, collocandolo nel panorama dello studio della sica del sapore
Trends in Detector R&D
Full text linkDetectors are they eyes with which we observe the physics and explore new phenomena. The development of more performing detectors is essential for future physics discoveries and requires appropriate attention, funding, and recognition. In this paper the current trends in High Energy Physics detector research and development are reviewed. Since the topic is broader than the available space, figures are not included in the paper, but can be found in the references, whose main sources are the recent instrumentation conferences [1 – 6]
CKM parameters and rare B decays
Full text linkMeasurements of the angles and sides of the unitarity triangle and of the rates of rare B meson decays are crucial for the precise determination of Standard Model parameters and are sensitive to the presence of new physics particles in the loop diagrams. In this paper the recent measurements performed in this area by BABAR and Belle will be presented. The direct measurement of the angle alpha is for the first time as precise as the indirect determination. The precision of the vertical bar V-ub vertical bar determination has improved significantly with respect to previous measurement. New limits on B -> tau nu decays are presented, as well as updated measurements on b -> s radiative transitions and a new observation of b -> d gamma transition made by Belle
MEASUREMENT OF MOS CURRENT MISMATCH IN THE WEAK INVERSION REGION
Full text linkWe have measured the current matching properties of MOS transistors operated in the weak inversion region. We measured a total of about 1400 PMOS and NMOS transistors produced in four different processes and report here the results in terms of mismatch dependence on current density, device dimensions, and substrate voltage, without using any specific model for the transistor
Frontier detectors for frontier physics - Proceedings of the 10th Pisa Meeting on Advanced Detectors - La Biodola, Isola d'Elba, Italy, May 21-27, 2006
No full textFrontier detector for frontier physics Proceedings of the 11th Pisa Meeting on Advanced Detectors La Biodola, Isola d'Elba, Italy May 24-30, 2009
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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