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: Ramona Vogt Publisher: Elsevier ISBN: 0080525369 Category : Science Languages : en Pages : 489
Book Description
This book is designed for advanced undergraduate and graduate students in high energy heavy-ion physics. It is relevant for students who will work on topics being explored at RHIC and the LHC. In the first part, the basic principles of these studies are covered including kinematics, cross sections (including the quark model and parton distribution functions), the geometry of nuclear collisions, thermodynamics, hydrodynamics and relevant aspects of lattice gauge theory at finite temperature. The second part covers some more specific probes of heavy-ion collisions at these energies: high mass thermal dileptons, quarkonium and hadronization. The second part also serves as extended examples of concepts learned in the previous part. Both parts contain examples in the text as well as exercises at the end of each chapter. - Designed for students and newcomers to the field- Focuses on hard probes and QCD- Covers all aspects of high energy heavy-ion physics- Includes worked example problems and exercises
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Author: Florian Jonas
Author: Fred Jegerlehner
Author: Cliff Burgess
Author: Christian W. Fabjan
Author: Eberhard Klempt
Author: Ramona Vogt
Author: Julian Schwinger