QCD transition temperature: full staggered result

We conclude our investigations on the QCD cross-over transition temperatures with 2+1 staggered flavours and one-link stout improvement. We extend our previous two studies [Phys. Lett. B643 (2006) 46, JHEP 0906:088 (2009)] by choosing even finer lattices (N_t=16) and we work again with physical quark masses. These new results [for details see JHEP 1009:073,2010] support our earlier findings. We compare them with the published results of the hotQCD collaboration. All these results are confronted with the predictions of the Hadron Resonance Gas model and Chiral Perturbation Theory for temperatures below the transition region. Our results can be reproduced by using the physical spectrum. The findings of the hotQCD collaboration can be recovered only by using a distorted spectrum. This analysis provides a simple explanation for the observed discrepancy in the transition T between our and the hotQCD collaborations.Comment: presented at the XXVIII. International Symposium on Lattice Field Theory, June 14-19,2010, Villasimius, Sardinia Ital

Recent results on the Equation of State of QCD

We report on a continuum extrapolated result (arXiv:1309.5258) for the equation of state (EoS) of QCD with $N_f=2+1$ dynamical quark flavors and discuss preliminary results obtained with an additional dynamical charm quark ($N_f=2+1+1$). For all our final results, the systematics are controlled, quark masses are set to their physical values, and the continuum limit is taken using at least three lattice spacings corresponding to temporal extents up to $N_t=16$.Comment: Conference proceedings: The 32nd International Symposium on Lattice Field Theory - Lattice 2014, June 23-28, 2014, Columbia University, New York, New Yor

Transition temperature and the equation of state from lattice QCD, Wuppertal-Budapest results

The QCD transition is studied on lattices up to $N_t=16$. The chiral condensate is presented as a function of the temperature, and the corresponding transition temperature is extracted. The equation of state is determined on lattices with $N_t=6,8,10$ and at some temperature values with $N_t=12$. The pressure and the trace anomaly are presented as functions of the temperature in the range 100 ...1000 MeV . Using the same configurations we determine the continuum extrapolated phase diagram of QCD on the $\mu-T$ plane for small to moderate chemical potentials. Two transition lines are defined with two quantities, the chiral condensate and the strange quark number susceptibility.Comment: 4 pages, 2 figures, Proceedings for Quark Matter 201

Two-flavor QCD at finite temperature and chemical potential in a functional approach

We summarize recent results obtained in the Dyson-Schwinger formalism to study the chiral and deconfinement phase transitions of quenched and unquenched QCD at finite temperature and chemical potential. In the quenched case we compare SU(2) and SU(3) gauge theories by taking lattice data for the gluon as an input for the quark Dyson-Schwinger equation. As compared to previous investigations we find a clearer distinction between the second order transition of the two-color theory and the (weak) first order transition of the three-color gauge theory. We then extend this study to unquenched QCD at finite chemical potential by taking matter effects to the gluon into account and investigate the order of the chiral phase transition and the behavior of the deconfinement transition. What we find are coinciding phase transitions up to a critical endpoint which is located at large chemical potential.Comment: 7 pages, 5 figures, contribution to the proceedings of the International School of Nuclear Physics, Erice 201

Cultura constructiva y vivienda progresiva. El caso de “Los Almendros”, Portoviejo – Ecuador

Popular constructive culture (PCC) transforms cities under procedures that can be seen as poorly planned and deregulated; the buildings show processes of renovation, adaptation, re-functionalization, and construction changes. Observing the case of edification in "Los Almendros" (1971-1975) in the city of Portoviejo-Ecuador, the article proposes a linear evaluation of triple purpose: 1. habitability, 2. quality-economy and 3. progressivity. The results obtained showed that the socio-spatial process determined a habitability index of 53.7%, with an optimization of the architectural design, it was improved to 71.5% and with an investment of 25% less than the annual costs and on the progressivity assessment, a functional adaptation of the building was obtained that adjusts to the variation of the family nucleus. That is simple strategies, typical of the PCC, that consider habitability, better economy, and progressiveness, allow buildings   with positive impacts on the quality of life of the inhabitants. Keywords: Constructive culture; habitability; progressiveness; Portoviejo.La cultura constructiva popular (CCP) transforma las ciudades bajo lógicas que pueden verse como poco planificadas y desregularizadas; las edificaciones muestran procesos de renovación, adaptación, refuncionalización y cambios constructivos. Observando el caso de las edificaciones de “Los Almendros” (1971-1975) de la ciudad de Portoviejo-Ecuador, el artículo plantea una evaluación lineal de triple propósito: 1. habitabilidad, 2. calidad-economía y 3. Progresividad. Los resultados obtenidos demostraron que el proceso socio espacial determinó un índice de habitabilidad de 53,7%, con una optimización del diseño arquitectónico se mejoró a un 71,5%, con una inversión del 25% menor a los costos anuales y sobre la valoración de progresividad, se obtuvo una adaptación funcional de la edificación que se ajusta a la variación del núcleo familiar. Es decir, estrategias simples, propias de la CCP, que consideren habitabilidad, calidad-economía y progresividad, permiten mejores edificaciones con impactos positivos en la calidad de vida de los habitantes. Palabras clave: Cultura constructiva; habitabilidad; progresividad; Portoviejo. Abstract Popular constructive culture (PCC) transforms cities under procedures that can be seen as poorly planned and deregulated; the buildings show processes of renovation, adaptation, re-functionalization, and construction changes. Observing the case of edification in "Los Almendros" (1971-1975) in the city of Portoviejo-Ecuador, the article proposes a linear evaluation of triple purpose: 1. habitability, 2. quality-economy and 3. progressivity. The results obtained showed that the socio-spatial process determined a habitability index of 53.7%, with an optimization of the architectural design, it was improved to 71.5% and with an investment of 25% less than the annual costs and on the progressivity assessment, a functional adaptation of the building was obtained that adjusts to the variation of the family nucleus. That is simple strategies, typical of the PCC, that consider habitability, better economy, and progressiveness, allow buildings   with positive impacts on the quality of life of the inhabitants. Keywords: Constructive culture; habitability; progressiveness; Portoviejo. Información del manuscrito:Fecha de recepción: 03 de mayo de 2021.Fecha de aceptación: 28 de junio de 2021.Fecha de publicación: 09 de julio de 2021

Is there still any Tc mystery in lattice QCD? Results with physical masses in the continuum limit III

The present paper concludes our investigations on the QCD cross-over transition temperatures with 2+1 staggered flavours and one-link stout improvement. We extend our previous two studies [Phys. Lett. B643 (2006) 46, JHEP 0906:088 (2009)] by choosing even finer lattices ($N_t$=16) and we work again with physical quark masses. The new results on this broad cross-over are in complete agreement with our earlier ones. We compare our findings with the published results of the hotQCD collaboration. All these results are confronted with the predictions of the Hadron Resonance Gas model and Chiral Perturbation Theory for temperatures below the transition region. Our results can be reproduced by using the physical spectrum in these analytic calculations. The findings of the hotQCD collaboration can be recovered by using a distorted spectrum which takes into account lattice discretization artifacts and heavier than physical quark masses. This analysis provides a simple explanation for the observed discrepancy in the transition temperatures between our and the hotQCD collaborations.Comment: 25 pages, 10 figures and 3 table

Performance of the CMS Cathode Strip Chambers with Cosmic Rays

The Cathode Strip Chambers (CSCs) constitute the primary muon tracking device in the CMS endcaps. Their performance has been evaluated using data taken during a cosmic ray run in fall 2008. Measured noise levels are low, with the number of noisy channels well below 1%. Coordinate resolution was measured for all types of chambers, and fall in the range 47 microns to 243 microns. The efficiencies for local charged track triggers, for hit and for segments reconstruction were measured, and are above 99%. The timing resolution per layer is approximately 5 ns

Performance and Operation of the CMS Electromagnetic Calorimeter

The operation and general performance of the CMS electromagnetic calorimeter using cosmic-ray muons are described. These muons were recorded after the closure of the CMS detector in late 2008. The calorimeter is made of lead tungstate crystals and the overall status of the 75848 channels corresponding to the barrel and endcap detectors is reported. The stability of crucial operational parameters, such as high voltage, temperature and electronic noise, is summarised and the performance of the light monitoring system is presented