198483386
A Silicon-Tungsten Electromagnetic Calorimeter with Integrated Electronics for the International Linear Collider
We present an update of the development of an electromagnetic calorimeter for the Silicon Detector concept for a future linear electron-positron collider. After reviewing the design criteria and related simulation studies, we discuss progress in the research and development of the detector. This concept has from the outset made the case for highly integrated electronic readout with small (1 mm) readout gaps in order to maintain a small Moliere radius for electromagnetic showers and to avoid active heat removal. We now have fully functioning 1024-channel readout chips which have been successfully bonded to 15 cm silicon sensors. We present initial results from these assemblies.
120038155
A measurement of the S- and P-wave content of antiproton annihilation at rest into two pions in liquid deuterium
Abstract Based on our measurement of the ratio f(π − π 0 p ) f(π + π − n ) =2.07±0.05 for antiproton annihilation at rest in liquid deuterium, we find that S-wave annihilation of the antiproton on the proton or neutron into ππ is dominant. We quote a 95% confidence level upper limit of 8% for P-wave annihilation into ππ.
118620496
Observation of narrow lines in the spectra of charged mesons produced in antiproton-proton annihilation at rest
62137856
Org.Lcsim: Event Reconstruction in Java
Maximizing the physics performance of detectors being designed for the International Linear Collider, while remaining sensitive to cost constraints, requires a powerful, efficient, and flexible simulation, reconstruction and analysis environment to study the capabilities of a large number of different detector designs. The preparation of Letters Of Intent for the International Linear Collider involved the detailed study of dozens of detector options, layouts and readout technologies; the final physics benchmarking studies required the reconstruction and analysis of hundreds of millions of events. We describe the Java-based software toolkit (org.lcsim) which was used for full event reconstruction and analysis. The components are fully modular and are available for tasks from digitization of tracking detector signals through to cluster finding, pattern recognition, track-fitting, calorimeter clustering, individual particle reconstruction, jet-finding, and analysis. The detector is defined by the same xml input files used for the detector response simulation, ensuring the simulation and reconstruction geometries are always commensurate by construction. We discuss the architecture as well as the performance.
8455143
mesh2gdml: From CAD to Geant4
As particle detectors and physics analyses become more complex, the need for more detailed simulations of the detector response becomes increasingly important. Traditionally, two-dimensional engineering drawings have been interpreted by physicists who then implement approximations to the individual parts in software simulation packages. This process requires a high level of experience in both the abstraction of the physical volumes as well as the implementation in code, and is prone to error. mesh2gdml is a program which allows three-dimensional tesselated geometrical volumes to be converted into a format which the Geant4 simulation toolkit can import directly. This provides a pathway for simulating the response of detector elements which have been designed in CAD programs without having to write any code.
17009280
Extra Dimensions: 3D and Time in PDF Documentation
High energy physics is replete with multi-dimensional information which is often poorly represented by the two dimensions of presentation slides and print media. Past efforts to disseminate such information to a wider audience have failed for a number of reasons, including a lack of standards which are easy to implement and have broad support. Adobe's Portable Document Format (PDF) has in recent years become the de facto standard for secure, dependable electronic information exchange. It has done so by creating an open format, providing support for multiple platforms and being reliable and extensible. By providing support for the ECMA standard Universal 3D (U3D) file format in its free Adobe Reader software, Adobe has made it easy to distribute and interact with 3D content. By providing support for scripting and animation, temporal data can also be easily distributed to a wide audience. In this talk, we present examples of HEP applications which take advantage of this functionality. We demonstrate how 3D detector elements can be documented, using either CAD drawings or other sources such as GEANT visualizations as input. Using this technique, higher dimensional data, such as LEGO plots or time-dependent information can be included in PDF files. In principle, a complete event display, with full interactivity, can be incorporated into a PDF file. This would allow the end user not only to customize the view and representation of the data, but to access the underlying data itself.
117291086
Measurement of the charged kaon mass with the MIPP RICH
The currently accepted value of the charged kaon mass is 493.677 {+-} 0.013 MeV (26 ppm). It is a weighted average of six measurements, most of which use kaonic atom X-ray energy techniques. The two most recent and precise results dominate the average but differ by 122 ppm. Inconsistency in the data set needs to be resolved, preferably using independent techniques. One possibility uses the Cherenkov effect. A measurement of the charged kaon mass using this technique is presented. The data was taken with the Main Injector Particle Production experiment at Fermi National Accelerator Laboratory using a tagged beam of protons, kaons, and pions ranging in momentum from 37 GeV/c to 63 GeV/c. The measured value is 491.3 {+-} 1.7 MeV. This is within 1.4{sigma} of the current value. An improvement in precision by a factor of 35 would make this technique competitive for resolving the ambiguity in the X-ray data.
120065376
Improvements to MINOS CCQE Analysis
The MINOS experiment has the world's largest data set of neutrino interactions in the 1–10 GeV energy range. In addition, the data are neutrino interactions on iron, allowing us to explore the nuclear effects on neutrino scattering. We present two improvements to the MINOS charged current quasi‐elastic analysis presented at NuInt 2009 [1]: a background correction function extracted from two resonance enhanced selections, and an improved fit procedure that includes event samples selected by looking for the recoil proton.