Study of the reaction pbar p -> phi phi from 1.1 to 2.0 GeV/c

A study has been performed of the reaction pbar p -> 4K using in-flight antiprotons from 1.1 to 2.0 GeV/c incident momentum interacting with a hydrogen jet target. The reaction is dominated by the production of a pair of phi mesons. The pbar p -> phi phi cross section rises sharply above threshold and then falls continuously as a function of increasing antiproton momentum. The overall magnitude of the cross section exceeds expectations from a simple application of the OZI rule by two orders of magnitude. In a fine scan around the xi/f_J(2230) resonance, no structure is observed. A limit is set for the double branching ratio B(xi -> pbar p) * B(xi -> phi phi) < 6e-5 for a spin 2 resonance of M = 2.235 GeV and Width = 15 MeV.Comment: 13 pages, 13 figures, 2 tables, Latex. To be published in Phys. Rev.

Twitter, Presidential Debates and Attention Economy: A Symbiosis between Television Audience and Social Media Users during Campaign Season

The year 2017 was an intense electoral year in Chile, both parliamentary and presidential. In this context, by using computer intelligence, an interdisciplinary team conducted a collection and volumetric analysis of over 3 million Twitter messages belonging to users that mentioned, at least once, any of the presidential candidates, both in the first and second voting round. Our goal was focused on analyzing the relationship between traditional media (radio and television) and Twitter, probing user interactions during the broadcast of live political shows, with emphasis on presidential debates. For this purpose, we carried out a volumetric analysis of all mentions in social media during the broadcast of live political shows to characterize the digital attention of the audience, under different parameters. Our results show that there is high user interest in the digital debate regarding presidential debates, a positive correlation between traditional media and Twitter during the broadcast of live political shows, and that, also, the latter trigger social media; furthermore, we verify the double screen phenomenon made possible by mobile platforms.El año 2017 fue un año de intensa actividad electoral en Chile, tanto parlamentaria como presidencial. En ese marco, mediante el uso de inteligencia computacional, un equipo interdisciplinario realizó una recolección y análisis volumétrico de más de 3 millones mensajes en Twitter pertenecientes a usuarios que mencionaran, al menos una vez, a alguno de los candidatos al sillón presidencial, tanto de primera como de segunda vuelta. Nuestro objetivo estuvo centrado en analizar la relación entre medios tradicionales (radio y televisión) y Twitter, explorando las interacciones de los usuarios durante la transmisión de programas políticos en vivo, con énfasis en los debates presidenciales. Para ello realizamos un análisis volumétrico de todas las menciones en la red social durante la emisión de los programas políticos en vivo para caracterizar la atención digital de la audiencia, bajo diferentes parámetros. Nuestros resultados muestran que existe un alto interés de los usuarios por debatir digitalmente en torno a los debates presidenciales, una correlación positiva entre medios tradicionales y Twitter durante la emisión de programas políticos en vivo, y que, además, estos últimos activan la red social; igualmente se verifica el fenómeno de la doble pantalla gracias al uso de plataformas móviles

The large-scale structure of globular clusters in the NGC 1052 group

Prompted by the many controversial claims involving the NGC 1052 group, including that it hosts two dark matter-free galaxies with overluminous and monochromatic globular cluster (GC) systems, here we map out the large-scale structure (LSS) of GCs over the entire group. To recover the LSS, we use archival optical CFHT imaging data. We recover two GC density maps, one based on universal photometric properties of GCs from simple stellar population models, and one based on the properties of spectroscopically confirmed GCs in DF2 and DF4 (the two dwarf galaxies with overluminous GC populations). Both selection methods reveal overdensities around the massive galaxies in the group, as well as around NGC 1052 itself, that are coincident with the positions of previously identified stellar streams and tidal features. No intragroup GCs are found connecting these structures to any of the dwarf galaxies. We find, however, two other dwarfs in the group hosting GC systems. These include RCP32 with 2 GCs with ages equivalent to the GCs around NGC 1052, and DF9 with 3 GCs with ages similar to the GCs around DF2 and DF4. We conclude that the GC distribution in the group does not strongly support any formation scenario in particular. It favours, nonetheless, scenarios relying on galaxy-galaxy interactions and on the coeval formation of GCs around the DM-free dwarf galaxies. These may include the recently proposed bullet-dwarf formation, as well as high-redshift tidal dwarf galaxy models.Comment: Accepted for publication in MNRAS. 11 pages, 5 figures, 2 table

Challenges Of Intersectionality In Gender, Science And Technology

This article reflects challenges regarding the interrelations between gender, science and technology (GST). The context of the commemorative event of 20 years of the Gender Studies Center - PAGU, was a great opportunity to conduct such a debate, allowing us to do a collective analysis of the trajectory of this field in Brazil and abroad, especially about the contributions of PAGU in the last decades. © 2016, Universidade Estadual de Campinas UNICAMP. All rights reserved.20164

Data Envelopment Analysis (D.E.A.) for urban road system performance assessment

Improving the efficiency of transport networks by enhancing road system performance, lays the foundations for the positive change process within a city, achieving good accessibility to the area and optimizing vehicle flows, both in terms of cost, management and attenuation of environmental impacts. The performance of an urban road system can be defined according to different thematic areas such as traffic flow, accessibility, maintenance and safety, for which the scientific literature proposes different measurement indicators. However variations in performance are influenced by interventions which differ from one another, such as infrastructure, management, regulation or legislation, etc.. Therefore sometimes it is not easy to understand which areas to act on and what type of action to pursue to improve road network performance. Of particular interest are the tools based on the use of synthetic macro-indicators that are representative of the individual thematic areas and are able to describe the behavior of the entire network as a function of its characteristic elements. These instruments are of major significance when they assess performance not so much in absolute terms but in relative terms, i.e. in relation to other urban areas comparable to the one being examined. Therefore the objective of the proposed paper is to compare performances of different urban networks, using a non-parametric linear programming technique such as Data Envelopment Analysis (DEA), Farrel (1957), in order to provide technical support to the policy maker in the choice of actions to be implemented to make urban road systems efficient. This work is the conclusive study of road system performance analysis using DEA. The study forms part of a research project supported by grant. PRIN-2009 prot. 2009EP3S42_003, in which the University di Cagliari is a partner with a research team comprising the authors of this paper, and which addresses performance assessment of road networks, Fancello, Uccheddu and Fadda (2013a),(2013b)

Temporal representations in human computer interaction: Designing for the lived experience of time

Temporal representations in Human Computer Interaction: is a portfolio of peer reviewed papers and media artworks representing several years of investigation, experimental making, and study into the perceptions and representation of time in digital media and Human Computer Interaction (HCI). The lived experience of time is fundamental to our understanding of the world and the work investigates the complex and contradictory nature of time and the powerful effect temporal representations have on health, well-being and perception.The investigation, methodology and outputs are based in the traditions of interdisciplinary electronic arts, technology research and digital culture. Practice-led, research through design techniques, are used as a means to explore alternative framings of temporal processes. I discuss the importance of temporal experience as a concern for contextual design and consider the models and lived experiences of time and how system-centric representations alter our perceptions of time.The papers and works (discussed in chapters 4, 5 and 6 and included in full in appendix a) cover three broad areas:Analysis and discussion of practice and language in HCI related to time;Experimental designs for temporal objects and media artworks;Finally through critical artefacts, media art and publications I discuss a new perspective on temporality in design and representation and present a framework for re-assessing how we include time in interaction design.The framework is designed to be used as a tool to support understanding of the temporality of users, or situations of use, and to assist in translating and re-framing insights into practical outputs for improved design of interactive systems. It contrasts system-centric with user-centric temporal representation, and contributes a new design methodology that is aimed at improving contextual design processes. By increasing awareness of temporal context, and the multi-dimensional nature of user’s temporality, designers can better understand user context when creating truly user centred interactive experiences

The Signatures Of Glueballs In J/ψJ/\psi Radiative Decays

Quantitative signatures of glueballs in $J/\psi$ radiative decays are discussed. Further experimental and theoretical investigations are sugessted.Comment: 6 Pages Latex file, Invited talk at 6th Intersection Conference Of Particle and Nuclear Physic

Challenges Of Intersectionality In Gender, Science And Technology

Este texto reflete sobre os avanços alcançados e desafios ainda vigentes na discussão sobre as inter-relações entre gênero, ciência e tecnologia (GC&amp;T). O contexto do evento comemorativo dos 20 anos do Núcleo de Estudos de Gênero &#8211; Pagu foi um ambiente propício para tal debate, permitindo que fizéssemos um exercício coletivo de análise sobre a trajetória desse campo temático no Brasil e no exterior e, especialmente, sobre a importante contribuição do Pagu nas últimas décadas.4