Open Charm Spectroscopy and Mass Measurements in LHCb

A study of $D^+\pi^-$, $D^0 \pi^+$ and $D^{*+}\pi^-$ final states is performed using pp collision data, corresponding to an integrated luminosity of 1.0 $fb^{-1}$, collected at a centre-of-mass energy of 7 TeV with the LHCb detector. The $D_1(2420)^0$ resonance is observed in the $D^{*+}\pi^-$ final state and the $D^*_2(2460)$ resonance is observed in the $D^+\pi^-$, $D^0 \pi^+$ and $D^{*+}\pi^-$ final states. For both resonances, their properties and spin-parity assignments are obtained. In addition, two natural parity and two unnatural parity resonances are observed in the mass region between 2500 and 2800 MeV. Further structures in the region around 3000 MeV are observed in all the $D^{*+}\pi^-$, $D^+\pi^-$ and $D^0 \pi^+$ final states. Using three- and four-body decays of $D$ mesons produced in semileptonic $b$-hadron decays, precision measurements of $D$ meson mass differences are made together with a measurement of the $D^{0}$ mass.Comment: 11 pages, 6 figures, 2 tables, to appear in the proceedings of The 6th International Workshop on Charm Physics (CHARM 2013

Open charm Spectroscopy and exotic states at LHCb

We present a summary of new experimental results on the status of the charm spectroscopy using inclusive approaches and Dalitz plot analyses of $B$ and $B_s$ decays. We also report on a new determination of the $X(3872)$ quantum numbers.Comment: To be published in the proceedings of CHARM-2015, Detroit, MI, 18-22 May 201

Safety, Efficacy and Evidence Base for Use of the Subcutaneous Implantable Cardioverter Defibrillator

The trans-venous implantable cardioverter defibrillator (TV-ICD) is effective in treating life-threatening ventricular arrhythmia and reduces mortality in high-risk patients. However, there are significant short- and long-term complications that are associated with intravascular leads. These shortcomings are mostly relevant in young patients with long life expectancy and low risk of death from non-arrhythmic causes. Drawbacks of trans-venous leads recently led to the development of the entirely subcutaneous implantable cardioverter defibrillator (S-ICD). The S-ICD does not require vascular access or permanent intravascular defibrillation leads. Therefore, it is expected to overcome many complications associated with conventional ICDs. This review highlights data on safety and efficacy of the S-ICD and is envisioned to help in identifying the role of this device in clinical practice

Three body decays of D0 and DS mesons

Results are presented on the study of three body decays of D0 -> K0s h+ h-, where h=pi/K and DS+ -> K0S K0S pi+. The data have been collected by the BaBar experiment at SLAC and are extracted from continuum e+ e- annihilations at the Upsilon(4S) energy.Comment: 11 pages, 13 postscript figues, contributed to the Proceedings of Hadron 2001, IX International Conference on Hadron Spectroscopy, Protvino, Russi

Sublinearly space bounded iterative arrays

Iterative arrays (IAs) are a, parallel computational model with a sequential processing of the input. They are one-dimensional arrays of interacting identical deterministic finite automata. In this note, realtime-lAs with sublinear space bounds are used to accept formal languages. The existence of a proper hierarchy of space complexity classes between logarithmic anel linear space bounds is proved. Furthermore, an optimal spacc lower bound for non-regular language recognition is shown. Key words: Iterative arrays, cellular automata, space bounded computations, decidability questions, formal languages, theory of computatio

The truth in a bubble the end of ‘audience democracy’ and the rise of ‘bubble democracy’.

This article sustains that the so-called ‘post-truth’ phenomenon also depends on the characteristics of the new ‘hybrid’ communicative scenario. The thesis is that this new scenario is substantially different from that of the ‘party democracy’, protagonist of significant part of the twentieth century, and from that of the ‘audience democracy’, defined by Bernard Manin in the mid-nineties. The emergence of new media entails a series of consequences, including the fragmentation of the audience into a plurality of self-referential segments, politically polarized ‘bubbles’, devoid, at least potentially, of a common communicative sphere. Taking into account such developments, the article seeks to construct the ‘ideal type’ of a ‘bubble democracy’, marked by the mistrust of institutions, fragmentation of the audience, disintermediation, homophilic tendencies, and polarization.Este artículo sostiene que el así llamado fenómeno de la “posverdad” también depende de las características del nuevo sistema de comunicación “híbrido”. La tesis es que este nuevo escenario es sustancialmente diferente a lo de la “democracia partidária”, protagonista de una parte significativa del siglo XX, y de la “democracia de audiencias”, definida por Bernard Manin a mediados de los noventa. La aparición de nuevos medios de comunicación tiene una serie de consecuencias, entre ellas la fragmentación de la audiencia en una pluralidad de segmentos auto-referenciales, “burbujas” políticamente polarizadas, desprovistas, por lo menos potencialmente, de una esfera comunicativa común. Teniendo en cuenta estos desarrollos, el artículo trata de construir el “tipo ideal” de “democracia de burbujas”, marcada por la desconfianza de las instituciones, fragmentación de la audiencia, desintermediación, tendencia a la homofilia, y la polarización

Administrators' Perceptions of the Value and Utility of State Assessment Data: A Research Study to Support Data Analysis and Student Achievement

This study examines administrator perceptions of Pennsylvania’s state assessment data. This study had three main purposes. The first purpose was to investigate the value and utility of state assessment data to inform decision making and the possibility of improving student achievement through the routine use of state assessment data. The second purpose of this study was to understand to what extent and how administrators use state assessment data to inform decisions. The third purpose was to explore what factors influence administrators’ use of state assessment data. The researcher sought to identify current data analysis practices, define strengths, describe opportunities for growth, and make recommendations for ongoing improvement. The need for this research is evident as federal and state accountability mandates have changed since the Every Student Succeeds Act was passed in 2015. Accordingly, this study provides insight for school district leaders who are seeking opportunities to develop and sustain a routine and systematic approach to analyzing and utilizing state assessment data to address student learning outcomes

Study of ϒ(1S) radiative decays to γπ+π- and γK+K-

We study the ϒ(1S) radiative decays to γπ+π- and γK+K- using data recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e+e- collider at center-of-mass energies at the ϒ(2S) and ϒ(3S) resonances. The ϒ(1S) resonance is reconstructed from the decay ϒ(nS) → π+π-ϒ(1S), n = 2, 3

Exotic Searches

The experimental information on the search for non $q \bar q$ mesons as glueballs, hybrids and multiquark states is reviewed. Candidate states which are particularly amenable to detailed study by accumulating large samples of $J/\psi$, $\eta_c$, $\chi$ decays at a $\tau$-charm factory are discussed.Comment: 25 pages, LaTex, 22 Figures (available from the authors on request), BARI-TH/94-17