Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2019 ( 146 )

2018 ( 224 )

2017 ( 206 )

2016 ( 288 )

Custom range...

Search Results: 1 - 10 of 119624 matches for " T. Schlüter "
All listed articles are free for downloading (OA Articles)
Page 1 /119624
Display every page Item
The exotic eta'pi- Wave in 190 GeV pi-p --> pi-eta'p at COMPASS
T. Schlüter,for the COMPASS Collaboration
Physics , 2011,
Abstract: A sample of 35,000 events of the type pi-p --> eta'pi-p_slow (eta' --> eta pi-pi+, eta --> gamma gamma) with -t>0.1 GeV^2/c^2 was selected from COMPASS 2008 data for a partial-wave analysis. We study the broad P_+ structure known from previous experiments at lower energies, in particular its phase motion relative to the D_+-wave near the a_2(1320) mass and relative to a broad D_+-wave structure at higher mass. We also find the a_4(2040). We compare kinematic plots for the eta'pi^- and eta pi- final states.
Odd and Even Partial Waves of ηπ^- and η'π^- in 191 GeV/c π^-p
T. Schlüter,for the COMPASS collaboration
Physics , 2014,
Abstract: In the year 2008 COMPASS recorded diffractive events of the signature \pi^-(191 GeV) p --> X_fast p. We present results of the analysis of the subsystems X = \eta(')\pi^-. Besides the known resonances a_2(1320), a_4(2040), we study the properties of the spin-exotic P+ wave, and all other natural-exchange partial waves up to spin J = 6. We find a striking difference between the two final states: whereas the even partial waves J = 2, 4, 6 in the two systems are related by phase-space factors, the odd partial waves are relatively suppressed in the \eta\pi^- system. The relative phases between the even waves appear identical whereas the phase between the D and P waves behave quite differently, suggesting different resonant and non-resonant contributions in the two odd-angular-momentum systems. Branching ratios and parameters of the well-known resonances a_2 and a_4 are measured.
Comment on "Material Evidence of a 38 MeV Boson"
J. Bernhard,J. M. Friedrich,T. Schlüter,K. Sch?nning,for the COMPASS Collaboration
Physics , 2012,
Abstract: In the recent preprint 1202.1739 it was claimed that preliminary data presented by COMPASS at recent conferences confirm the existence of a resonant state of mass 38 MeV decaying to two photons. This claim was made based on structures observed in two-photon mass distributions which however were shown only to demonstrate the purity and mass resolution of the {\pi}0 and {\eta} signals. The additional structures are understood as remnants of secondary interactions inside the COMPASS spectrometer. Therefore, the COMPASS data do not confirm the existence of this state.
Resonances of the systems π-ηand π-η' in the reactions π-p --> π-ηp and π-p --> π-η' p at COMPASS
T. Schlüter,D. Ryabchikov,W. Dünnweber,M. Faessler,for the COMPASS Collaboration
Physics , 2012,
Abstract: We describe partial-wave analyses of the systems \pi-\eta and \pi-\eta' produced in interactions of a \pi- beam (190 GeV/c) with a liquid hydrogen target. The data were recorded during the 2008 COMPASS run, where a slow recoiling proton (|t|>0.1 GeV^2) was required by the trigger. We compare analyses of the \pi-\eta and \pi-\eta' data. Significant contributions can be attributed to the resonances a_2(1320), observed in the D_+-wave, and a_4(2040), observed in the G_+-wave. Between the two systems, we find similar compositions of the even partial waves D_+ and G_+ after taking phase-space factors into account, but a much enhanced P_+-wave in \pi-\eta'. Relative phase-differences indicate a large incoherent contribution of in the P_+-wave of the \eta'\pi- system, but other interpretations are not excluded. The known resonances a_2(1320), a_4(2040) and their parameters could be extracted from the data; their branchings are found to roughly agree with predictions from \eta\eta' mixing.
Regina G. Schlüter
Tourismos : an International Multidisciplinary Journal of Tourism , 2011,
Abstract: Rural tourism is gaining new fans all the time, especially in those countries that have not been blessed with the natural resources necessary for a beach holiday industry, or that don't have a sufficiently significant cultural heritage to generate large waves of tourists. However the peacefulness of the countryside, the communing with nature and the chance to indulge in some traditional rural activities are not enough for a lot of people. As a result, people are increasingly turning to gastronomy as an important complement of this type of tourism and as a means of promoting rural development by offering traditional cuisine to tourists. This paper sets out a brief description of this phenomenon based on a study conducted in Tomás Jofré, in Argentina, of the risks which a tourist strategy, apparently risk-free and without any negative consequences, can create for a tourist destination.
Uma pré-historia do turismo no Brasil: recrea es aristocráticas e lazeres burgueses (1808 -1850)
Regina G. Schlüter
Estudios y perspectivas en turismo , 2008,
Turismo y cultura
Regina G. Schlüter
Estudios y perspectivas en turismo , 2005,
A survey on independence-based Markov networks learning
Federico Schlüter
Computer Science , 2011, DOI: 10.1007/s10462-012-9346-y
Abstract: This work reports the most relevant technical aspects in the problem of learning the \emph{Markov network structure} from data. Such problem has become increasingly important in machine learning, and many other application fields of machine learning. Markov networks, together with Bayesian networks, are probabilistic graphical models, a widely used formalism for handling probability distributions in intelligent systems. Learning graphical models from data have been extensively applied for the case of Bayesian networks, but for Markov networks learning it is not tractable in practice. However, this situation is changing with time, given the exponential growth of computers capacity, the plethora of available digital data, and the researching on new learning technologies. This work stresses on a technology called independence-based learning, which allows the learning of the independence structure of those networks from data in an efficient and sound manner, whenever the dataset is sufficiently large, and data is a representative sampling of the target distribution. In the analysis of such technology, this work surveys the current state-of-the-art algorithms for learning Markov networks structure, discussing its current limitations, and proposing a series of open problems where future works may produce some advances in the area in terms of quality and efficiency. The paper concludes by opening a discussion about how to develop a general formalism for improving the quality of the structures learned, when data is scarce.
Large-Area Sandwich Veto Detector with WLS Fibre Readout for Hadron Spectroscopy at COMPASS
T. Schlüter,W. Dünnweber,K. Dhibar,M. Faessler,R. Geyer,J. -F. Rajotte,Z. Roushan,H. W?hrmann
Physics , 2011, DOI: 10.1016/j.nima.2011.05.069
Abstract: A sandwich detector composed of scintillator and steel-covered lead layers was introduced in the fixed-target COMPASS experiment at CERN for vetoing events not completely covered by the two-stage magnetic spectrometer. Wavelength shifting fibres glued into grooves in the scintillator tiles serve for fast read-out. Minimum ionizing particles impinging on the $2 \textrm{m} \times 2 \textrm{m}$ detector outside of a central hole, sparing the spectrometer's entry, are detected with a probability of 98%. The response to charged particles and photons is modeled in detail in Monte Carlo calculations. Figures of merit of the veto trigger in $190 \textrm{GeV}/c$ $\pi^- + p$ (or nucleus) experiments are an enrichment of exclusive events in the recorded data by a factor of 3.5 and a false-veto probability of 1%.
El turismo en los pueblos rurales de argentina: ?Es la gastronomía una opción de desarrollo?
Navarro,Fernando; Schlüter,Regina;
Estudios y perspectivas en turismo , 2010,
Abstract: tourism in small rural communities of argentina. can gastronomy be an option for development? small rural communities close to argentine's main cities aim to gain benefit from tourists and visitors for the day developing different products. this paper makes a special reference to the small towns located near the city of buenos aires, in particular to tomás jofré, which aim to bring together stillness, rural heritage un local culinary in order to find a place in the market. it has been observed that not withstanding their attractions, gastronomy is still the main reason to visit this places and that the simple act of "eating" brings with it a sequence of negative impacts which have to bee addressed in order to avoid that tourist stop visiting.
Page 1 /119624
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.