Magnetization dynamics down to zero field in dilute (Cd,Mn)Te quantum wells

The evolution of the magnetization in (Cd,Mn)Te quantum wells after a short pulse of magnetic field was determined from the giant Zeeman shift of spectroscopic lines. The dynamics in absence of magnetic field was found to be up to three orders of magnitude faster than that at 1 T. Hyperfine interaction and strain are mainly responsible for the fast decay. The influence of a hole gas is clearly visible: at zero field anisotropic holes stabilize the system of Mn ions, while in a magnetic field of 1 T they are known to speed up the decay by opening an additional relaxation channel

A Shift from 2D Design Paradigm of the 19 th Century to 3D/CityGML, BIM, 3D Printing and Some of Smarter Cities in Poland

A road from paper-based-administration of the 80-ties to Smart Cities of today is being showed in this paper. Shift from paper do digital environment started with regaining of Polish independence in 1989, 26 years ago. The first e-mail from Poland was sent in 1990 year, 19 years after the first e-mail on the world of Ray Tomlinson (1971). Transfter of legal responsibilities, legal power, competences and finance from the top to local levels resulted in revolution in IT sector, which was the first commercial sector running in apost comunist country, in the 80-ties and the beginning of 90ties.Pressure for changes was visible exspecially in the biggest cities, and were initially connected with process of “mucicipalization” – i.e. – transfering of ownership of land from the state level to the level of municipalities. Signum Tempori of this time, was a process of transfer of state owned land to the city property of the City of Gdansk, where more than 30000 real estates of of the market value of 750 million US dollars were transferred and became municipal between 1992 and 1994 years. More and more LIS (Land Information Systems) and GIS (Geographic Information Systems) were implemented, without interoperability rules and standards. Lack of ability to adapt centrain common standards between State Surveying and the biggest cities resulted in appearance of more than 20 graphical applications and more then 20 textual databases applications which required later substantial efforts and costs to overcome information chaos. 10 biggest metropolitan Polish Cities spend more then 3 times than the General Office of Geodesy and Cadasrte of Poland, between 1991 and 1994. Gradual implementaion of INSPIRE Directive and the Law of National Infrastrructure of Spatial Information created unprecedented shitf from paper maps and paper records to almost all digital Poland. Expenditures of c.a. 650 million PLN were assigned to creation of digital representaion of all 34 data layers of INSPIRE Directive for the impelmentaion period of 2010 to 2019. Nevertheless, this amount has been almost doubled in the first 3 years, taking into acccount expenditures of only regional and local GIS/SDI Projects. Polish spatial and economic conditions created spatio-economic background, within which more than 65 % of GDP of Poland is located within 12 metropolitan areas, and at the same time around 67 % of Polish GDP is being generated by more than 4 million of micro or small businesses (often small “family” businesses.).Polish Spatial Planning Law of 2003 has weakened spatial planning regulation, allowing for certain “exception from the rule”, which became a new rule in itself. Basically, this “door” in the law to obtain building permint outside the borders of local development plan – resulted in issuing of more than 700 000 building permits – all located ouside territories of local spatial development plans between 2003 and 2015. Therefore we observe freely flowing process of urban sprawl on one hand and increased land consumption, expecially in the peri-urban zones of all metropolitan cities, and on the other hand, from the economic point of view – Poland has experienced unprecedented GDP growth in recent 10 or 12 years. Nevertheless several really interesting projects have been kicked-off by metropolitan cities, regions and General Survey of Poland (GUGIK). One of the most interesting projects – ISOK (Informatic System of State Protection against Extraordinary Threads) was impelmented between 2011 and 2015, at the cost of c.a. 300 million PLN, resulting in creation of laser scanning data for 92 % of territory of Poland. Continuation of this project was secured in the autumn of 2015 year, devoting budget of 189 million PLN for the project called CAPAP (acronyme from “ Centre of Spatial Analysis of Public Administration), which aim is to provide 3D model of all buildings in Poland, in compliance with CityGML LOD 2 (second Level of Detail), withing the time frame 2016 – 2018. So, all territory of Poland will become 3D in 3 years time in accordance with CityGLM LoD2 and some studies and pilot projects going in this direction are being described in this paper. Some recent exercises with 3D printing of new urban projects are being reported at the end of article

Study of Tau-pair Production in Photon-Photon Collisions at LEP and Limits on the Anomalous Electromagnetic Moments of the Tau Lepton

Tau-pair production in the process e+e- -> e+e-tau+tau- was studied using data collected by the DELPHI experiment at LEP2 during the years 1997 - 2000. The corresponding integrated luminosity is 650 pb^{-1}. The values of the cross-section obtained are found to be in agreement with QED predictions. Limits on the anomalous magnetic and electric dipole moments of the tau lepton are deduced.Comment: 20 pages, 9 figures, Accepted by Eur. Phys. J.

CP asymmetry in B→ϕKSB \to \phi K_S in a general two-Higgs-doublet model with fourth-generation quarks

We discuss the time-dependent CP asymmetry of decay $B \to \phi K_S$ in an extension of the Standard Model with both two Higgs doublets and additional fourth-generation quarks. We show that although the Standard Model with two-Higgs-doublet and the Standard model with fourth generation quarks alone are not likely to largely change the effective $\sin 2 \beta$ from the decay of $B \to \phi K_S$, the model with both additional Higgs doublet and fourth-generation quarks can easily account for the possible large negative value of $\sin 2 \beta$ without conflicting with other experimental constraints. In this model, additional large CP violating effects may arise from the flavor changing Yukawa interactions between neutral Higgs bosons and the heavy fourth generation down type quark, which can modify the QCD penguin contributions. With the constraints obtained from $b \to s \bar{s} s$ processes such as $B \to X_s \gamma$ and $\Delta m_{B_s^0}$, this model can lead to the effective $\sin 2 \beta$ to be as large as $- 0.4$ in the CP asymmetry of $B \to \phi K_S$.Comment: 13 pages, 5 figures, references added, to appear in Eur.Phys.J.

Energy dependence of Cronin momentum in saturation model for p+Ap+A and A+AA+A collisions

We calculate $\sqrt{s}$ dependence of Cronin momentum for $p+A$ and $A+A$ collisions in saturation model. We show that this dependence is consistent with expectation from formula which was obtained using simple dimentional consideration. This can be used to test validity of saturation model (and distinguish among its variants) and measure $x$ dependence of saturation momentum from experimental data.Comment: LaTeX2e, 12 pages, 8 figure

A Precise Measurement of the Tau Lifetime

The tau lepton lifetime has been measured with the e+e- -> tau+tau- events collected by the DELPHI detector at LEP in the years 1991-1995. Three different methods have been exploited, using both one-prong and three-prong tau decay channels. Two measurements have been made using events in which both taus decay to a single charged particle. Combining these measurements gave tau_tau (1 prong) = 291.8 +/- 2.3 (stat) +/- 1.5 (sys) fs. A third measurement using taus which decayed to three charged particles yielded tau_tau (3 prong) = 288.6 +/- 2.4 (stat) +/- 1.3 (sys) fs. These were combined with previous DELPHI results to measure the tau lifetime, using the full LEP1 data sample, to be tau_tau = 290.9 +/- 1.4 (stat) +/- 1.0 (sys) fs.Comment: 27 pages, 7 figure

Search for composite and exotic fermions at LEP 2

A search for unstable heavy fermions with the DELPHI detector at LEP is reported. Sequential and non-canonical leptons, as well as excited leptons and quarks, are considered. The data analysed correspond to an integrated luminosity of about 48 pb^{-1} at an e^+e^- centre-of-mass energy of 183 GeV and about 20 pb^{-1} equally shared between the centre-of-mass energies of 172 GeV and 161 GeV. The search for pair-produced new leptons establishes 95% confidence level mass limits in the region between 70 GeV/c^2 and 90 GeV/c^2, depending on the channel. The search for singly produced excited leptons and quarks establishes upper limits on the ratio of the coupling of the excited fermio

Search for lightest neutralino and stau pair production in light gravitino scenarios with stau NLSP

Promptly decaying lightest neutralinos and long-lived staus are searched for in the context of light gravitino scenarios. It is assumed that the stau is the next to lightest supersymmetric particle (NLSP) and that the lightest neutralino is the next to NLSP (NNLSP). Data collected with the Delphi detector at centre-of-mass energies from 161 to 183 \GeV are analysed. No evidence of the production of these particles is found. Hence, lower mass limits for both kinds of particles are set at 95% C.L.. The mass of gaugino-like neutralinos is found to be greater than 71.5 GeV/c^2. In the search for long-lived stau, masses less than 70.0 to 77.5 \GeVcc are excluded for gravitino masses from 10 to 150 \eVcc . Combining this search with the searches for stable heavy leptons and Minimal Supersymmetric Standard Model staus a lower limit of 68.5 \GeVcc may be set for the stau mas