1,721,139 research outputs found
On a possible EPR experiment with B-d(0)(B-d(0))over-bar pairs
No full textA very general local realistic theory of single B-d(0) mesons and of correlated B-d(0) pairs is formulated. If these pairs are produced in gamma(4S) decay, the local realistic asymmetry for observing pairs with like and unlike flavour at different proper times remarkably differs from the quantum mechanical prediction. Asymmetric B factories provide a powerful tool for the study of the EPR problem since the relative detection experiments can be shown to be capable of a time-dependent measurement precise enough to discriminate between local realism and quantum theory
The BaBar silicon-vertex tracker: Performance, running experience, and radiation-damage studies
No full textThe silicon-vertex tracker (SVT) for the BaBar Experiment at the PEP-II Asymmetric B Factory at Stanford Linear Accelerator Center (SLAC), is a five-layer double-sided ac-coupled silicon-microstrip detector. It is a crucial element for the precise measurement of the decay position of B mesons, satisfying the severe constraints imposed by the accelerator design, in terms of geometry of the interaction region and conditions of operation. In the following paper, the SVT performance is described. Radiation issues are discussed and the results of different tests aimed to study the decrease in the SVT performance due to radiation damage are presented. The alignment procedure is described, and a few BaBar physics results are presented as examples of the SVT capabilities to reconstruct decay vertices with good resolution and efficiency
Measurement of the muon stopping power in lead tungstate RID H-5657-2011 RID G-1804-2011 RID D-8853-2011 RID E-8846-2011 RID A-4009-2011 RID B-2993-2011 RID B-9140-2011 RID D-8062-2011 RID H-6210-2011
No full textA large sample of cosmic ray events collected by the CMS detector is exploited to measure the specific energy loss of muons in the lead tungstate (PbWO(4)) of the electromagnetic calorimeter. The measurement spans a momentum range from 5 GeV/c to 1 TeV/c. The results are consistent with the expectations over the entire range. The calorimeter energy scale, set with 120 GeV/c electrons, is validated down to the sub-GeV region using energy deposits, of order 100MeV, associated with low-momentum muons. The muon critical energy in PbWO(4) is measured to be 160(-6)(+5) +/- 8 GeV, in agreement with expectations. This is the first experimental determination of muon critical energy
The BaBar Silicon Vertex Tracker
No full textThe BaBar Silicon Vertex Tracker (SVT) is a five layer device, made from double-sided silicon strip detectors and read out via a custom time-over-threshold circuit, the AToM chip. The SVT is an essential part of the physics program of BaBar, and is able to reconstruct B mason decay vertices with a precision sufficient to measure time-dependent CP violating asymmetries at the PEP-II asymmetric e(+)e(-) collider. This report will give an overview of the SVT, with particular focus on the performance of the SVT, which has been taking colliding beam data since May 1999. (C) 2001 Elsevier Science B.V. All rights reserved
The BaBar silicon vertex tracker
No full textThe BaBar Silicon Vertex Tracker (SVT) is designed to provide the high-precision vertexing necessary for making measurements of CP violation at the SLAG B-Factory PEP-II. The instrument consists of five layers of double-sided silicon strip detectors and has been installed in the BaBar experiment and taking colliding beam data since May 1999. An overview of the design as well as performance and experience from the initial running will be presented. (C) 2000 Published by Elsevier Science B.V. All rights reserved
Performance of the BABAR silicon vertex tracker
No full textThe Silicon Vertex Tracker (SVT) of the BABAR experiment at the PEP-II asymmetric B factory is a five layer double sided, AC coupled silicon microstrip detector. It represents the crucial element to precisely measure the decay position of B mesons. The SVT architecture is shown and its performances, like hit resolutions and efficiencies, are described. Radiation issues are discussed and the alignment procedure for the SVT is described. As an example for the physics performance the B lifetime measurement, including B vertex reconstruction, is shown. (C) 2002 Elsevier Science B.V. All rights reserved
The design and construction of the BaBar silicon vertex tracker
No full textThe Silicon Vertex Tracker (SVT) of the BaBar experiment at the PEP-II asymmetric B factory consists of five layers of double-sided, AC-coupled silicon strip detectors. The detectors are readout with a custom IC, capable of simultaneous acquisition, digitization and transmission of data. The SVT geometry is shown and the construction phases of its modules are described in detail, with emphasis on the bending procedures needed for the arch-modules of the outer layers. (C) 2000 Elsevier Science B.V. All rights reserved
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