Study of E+e- Collisions in the 1.5-3 GeV C.M. Energy Region Using ISR at BABAR. PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 5
Book Description
A preliminary analysis of low-energy ee− collision data produced via initial state radiation (ISR) has been performed using 22 fb−1 of BABAR data. The selection of data samples corresponding to the?+?−,?+?−, K+K−, p{bar p}, K+K−?°, 3?, 4?, 5?, 6?, 7? final states accompanied by the emitted ISR hard photon has been demonstrated. The invariant mass of the hadronic final state defines the effective collision c.m. energy, and so BABAR ISR data can be compared to the relevant direct e+e− measurements. The resulting distributions are already competitive with DCI and ADONE data in the 1.4-3.0 GeV energy range. In particular, they do not suffer from the relative normalization uncertainties observed for certain reactions when results from different experiments are combined. Eventually, such data may be used to measure the energy dependence of R, the ratio of the e+e− hadrons and e+e− →?+?− cross sections, in the low-energy regime where precise measurements will have an impact on the interpretation of the new (g-2){sub {mu}} measurements.
Author: Publisher: ISBN: Category : Languages : en Pages : 5
Book Description
A preliminary analysis of low-energy ee− collision data produced via initial state radiation (ISR) has been performed using 22 fb−1 of BABAR data. The selection of data samples corresponding to the?+?−,?+?−, K+K−, p{bar p}, K+K−?°, 3?, 4?, 5?, 6?, 7? final states accompanied by the emitted ISR hard photon has been demonstrated. The invariant mass of the hadronic final state defines the effective collision c.m. energy, and so BABAR ISR data can be compared to the relevant direct e+e− measurements. The resulting distributions are already competitive with DCI and ADONE data in the 1.4-3.0 GeV energy range. In particular, they do not suffer from the relative normalization uncertainties observed for certain reactions when results from different experiments are combined. Eventually, such data may be used to measure the energy dependence of R, the ratio of the e+e− hadrons and e+e− →?+?− cross sections, in the low-energy regime where precise measurements will have an impact on the interpretation of the new (g-2){sub {mu}} measurements.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
First results of a study of the ee− → ?+?−?+?−? process with hard photon emitted from initial state are presented. About 60000 fully reconstructed events have been selected based on 89.3 fb−1 of BABAR data. The invariant mass of the hadronic final state defines the effective collision c.m. energy, and so BABAR ISR data can be compared to the relevant direct e+e− measurements. From obtained 4? mass spectrum we evaluate e+e− → ?+?−?+?− cross section for the range of c.m.s. energy from 0.6 to 4.5 GeV. The systematic error of the cross section measurement is 5% and comparable with the best e+e− data. The cross sections for identified 2K2? and 4K final states also have been presented.
Author: Fred Jegerlehner Publisher: Springer Science & Business Media ISBN: 3540726330 Category : Science Languages : en Pages : 433
Book Description
This book reviews the present state of knowledge of the anomalous magnetic moment a=(g-2)/2 of the muon. The muon anomalous magnetic moment is one of the most precisely measured quantities in elementary particle physics and provides one of the most stringent tests of relativistic quantum field theory as a fundamental theoretical framework. It allows for an extremely precise check of the standard model of elementary particles and of its limitations.
Author: Christian W. Fabjan Publisher: Springer Nature ISBN: 3030353184 Category : Elementary particles (Physics). Languages : en Pages : 1083
Book Description
This second open access volume of the handbook series deals with detectors, large experimental facilities and data handling, both for accelerator and non-accelerator based experiments. It also covers applications in medicine and life sciences. A joint CERN-Springer initiative, the "Particle Physics Reference Library" provides revised and updated contributions based on previously published material in the well-known Landolt-Boernstein series on particle physics, accelerators and detectors (volumes 21A, B1,B2,C), which took stock of the field approximately one decade ago. Central to this new initiative is publication under full open access
Author: Eberhard Klempt Publisher: American Institute of Physics ISBN: Category : Science Languages : en Pages : 1006
Book Description
The main topic of the conference was the physics of strong interaction and the understanding of how quarks form hadrons, which are part of the atomic nucleus. The proceedings give a comprehensive overview of the present status of the physics of hadrons. Topics include: mesons, baryons, scalars, exotics, heavy quarks, theoretical concepts, hadrons in matter, and reactions. The timing of the conference was very fortunate as many new and surprising results appeared in the months before its start. The highlights were the discussions about the nature of the recently discovered arrow states.
Author: Helmuth Spieler Publisher: OUP Oxford ISBN: 0191523658 Category : Technology & Engineering Languages : en Pages : 513
Book Description
Semiconductor sensors patterned at the micron scale combined with custom-designed integrated circuits have revolutionized semiconductor radiation detector systems. Designs covering many square meters with millions of signal channels are now commonplace in high-energy physics and the technology is finding its way into many other fields, ranging from astrophysics to experiments at synchrotron light sources and medical imaging. This book is the first to present a comprehensive discussion of the many facets of highly integrated semiconductor detector systems, covering sensors, signal processing, transistors and circuits, low-noise electronics, and radiation effects. The diversity of design approaches is illustrated in a chapter describing systems in high-energy physics, astronomy, and astrophysics. Finally a chapter "Why things don't work" discusses common pitfalls. Profusely illustrated, this book provides a unique reference in a key area of modern science.
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Author: Florian Jonas
Author: Cliff Burgess
Author: Fred Jegerlehner
Author: Christian W. Fabjan
Author: Eberhard Klempt
Author: Julian Schwinger
Author: Helmuth Spieler