1,721,834 research outputs found
Recent results on top-quark physics by CMS
No full textThe article reports a selection of recent results on top-quark physics by the CMS experiment at the CERN Large Hadron Collider. Results on inclusive and differential cross sections, as well as measurements of properties of the top quark, are reported
Results on the CKM Parameter from the BaBar and Belle Experiments
No full textThis report presents a review of recent results for the determination of the parameter β(φ1) of the Cabibbo-Kobayashi-Maskawa matrix through the measurement of time-dependent CP asymmetries in B-meson decays by the BaBar and Belle experiments
Recent results on charmonium physics
No full textThe large data samples accumulated by the Belle, BaBar, BES and CLEO experiments and the experiments at the Tevatron allow to shed new light on the properties of states with c (c) over bar content, and possibly access to new spectroscopies beyond the conventional charmonium picture, is at hands. A selection of recent results on charmonium physics is reported in this paper
HadronicBdecays at BaBar
No full textThe large integrated luminosity collected by the BaBar detector at the SLAC PEP-II e+e− B-Factory offers an excellent opportunity for the study of hadronic B-meson decays. A selection of recent results reported by BaBar is presented: a full amplitude analysis of B decays to the vector-vector final states phiK*, branching fraction measurements and study of decay dynamics in B decays to proton-antiproton pairs and a light hadron, and branching fraction measurements of B decays to the charmonium states ηc and hc and K or K* meson
Hadron spectroscopy at BABAR
No full textThe high integrated luminosity collected by the BABAR detector at the SLAC PEP-II e
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B-Factory offers an excellent opportunity for the study of heavy-quark spectroscopy. A selection of the most recent results reported by BABAR will be presented, focussing on recently observed states with both open- and hidden-charm content
Bottomonium results by BABAR
No full textBy using data collected in e+e- collisions at center-of-mass energies corresponding to the Y resonances of bottomonium, the BABAR experiment reported several new measurements on states with bb content. A selection of recent results is reported here
Measurement of the weak mixing angle using the forward-backward asymmetry of Drell-Yan events in pp collisions at 8 TeV
No full text: A measurement is presented of the effective leptonic weak mixing angle ( sin2θeffl ) using the forward-backward asymmetry of Drell-Yan lepton pairs ( μμ and e e ) produced in proton-proton collisions at s=8TeV at the CMS experiment of the LHC. The data correspond to integrated luminosities of 18.8 and 19.6fb-1 in the dimuon and dielectron channels, respectively, containing 8.2 million dimuon and 4.9 million dielectron events. With more events and new analysis techniques, including constraints obtained on the parton distribution functions from the measured forward-backward asymmetry, the statistical and systematic uncertainties are significantly reduced relative to previous CMS measurements. The extracted value of sin2θeffl from the combined dilepton data is sin2θeffl=0.23101±0.00036(stat)±0.00018(syst)±0.00016(theo)±0.00031(parton distributions in proton)=0.23101±0.00053
Analysis of tectonic structures on the Martian surface: a contribution to the understanding of the crustal dichotomy
No full textPolyphase tectonics on Mars: Insight from the Claritas Fossae
No full textThe Claritas Fossae (CF) is an elongated system of scarps and depressions >900 km long, representing the western boundary of the Thaumasia Region to the south of the Tharsis volcanic province. Although there is general agreement on the tectonic nature of such major physiographic feature, the processes that led to its formation are still debated. This study aims to better understand the tectonic evolution of the CF by combining two methodologies: kinematic numerical modelling and structural mapping. Through kinematic numerical modelling, we reproduce the present-day long-wavelength topography (hundreds of kilometres) at CF along four across-strike topographic profiles through the activity of a crustal listric normal fault. We observe that the modelled fault reaches the base of the crust, located at 80 km of depth, without changes in its listric geometry, suggesting a rather homogeneous thick crust. The accuracy of the results is based on the calculated mean misfit between the Martian and modelled topography. In two of the four profiles, the misfit is locally relatively higher, suggesting that the normal dip-slip component alone hardly explains the entire tectonic setting. Through structural mapping, we explore the depressions and scarps that feature the entire study area. We identify four sets of lineaments with different kinematics. The angular and crosscutting relationships between the sets suggest a Riedel-type arrangement within a dextral strike-slip shear zone. Thus, we propose a tectonic evolutionary model of the CF that involves a polyphase evolution made up of a Noachian-Early Hesperian right-lateral strike-slip phase followed by a Late Hesperian-Early Amazonian transtensional reactivation characterised by a significant normal dip-slip component. Our results suggest that the tectonics on Mars were not exclusively single or longterm deformations and that multiple subsequent tectonic events may have contributed to the present-day settin
Hierarchical-agglomerative clustering analysis of geomorphic features applied to tectonic investigation of terrestrial planets: An example from Claritas Fossae, Mars
No full textA hierarchical-agglomerative clustering workflow is proposed to investigate
regions on planetary surfaces. This algorithm comprises two primary steps: (i) calculating the dissimilarity between each object and (ii) grouping objects using a hierarchical clustering method. The efficiency of the workflow hinges on two critical parameters that require careful selection: the attributes for grouping
objects and the number of clusters for interpretation. We applied this approach to tectonic lineaments in the Claritas Fossae (CF) region on Mars, a complex area significantly shaped by tectonic activity. Our analysis considered three
attributes of these lineaments: (i) azimuthal direction, (ii) length, and (iii) centroid position. The optimal number of clusters was determined using the Silhouette index (S), which assesses the robustness of the clustering results.
Our objectives were twofold: (i) to replicate the distribution of lineament sets obtained from classical geostatistical analysis of their azimuthal orientation and (ii) to refine the subdivision by varying combinations of the three attributes. Our results provide crucial insights into the geo-tectonic evolution of CF, supporting the hypothesis of a tectonic evolution characterised by a polyphase history. In addition, we demonstrate how the method is capable of effectively identified areas with varying intensities of brittle deformation
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