Recent BABAR Results on Two-photon Physics PDF Download
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Languages : en
Pages : 4
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Author:
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ISBN:
Category :
Languages : en
Pages : 4
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Category :
Languages : en
Pages : 6
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The authors present measurements of the [gamma][gamma]* → [pi]° transition form factor for the momentum transfer range Q2 = 4-40 GeV2 and the [gamma][gamma]* → [eta]{sub c} transition form factor for the range Q2 = 2-50 GeV2. The results of the measurement of the [eta]{sub c} mass, total and two-photon widths are also presented.
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Languages : en
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We present a measurement of the total width[Lambda][sub tot][sup[eta][sub c]] and mass M[sub[eta][sub c]] of the[eta][sub c] meson with the BABAR detector at the PEP-II B-factory at SLAC. The results based on a data sample of 88 fb[sub -1] are[Lambda][sub tot][sup[eta][sub c]]= (33.3[+-] 2.5(stat.)[+-] 0.8(sys.))MeV/c[sup 2] and M[sub[eta][sub c]]= (2983.3[+-] 1.2[+-] 1.8) MeV/c[sup 2]. An enhancement observed around 3.63 GeV/c[sup 2] can be interpreted as an evidence for the[eta][sub c](2S) state. In addition a preliminary measurement of the[tau] lepton lifetime using 30.2 fb[sup -1] is described. The measured[tau] lifetime is:[tau][sub[tau]]= (290.8[+-] 1.5(stat.)[+-] 1.6(syst.)) fs.
Author: Jacob Grunhaus
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Category :
Languages : de
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Author: Alexander I Studenikin
Publisher: World Scientific
ISBN: 9814480940
Category : Science
Languages : en
Pages : 439
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This volume brings together the latest developments within a wide spectrum of topics in particle physics. Covering both theoretical and experimental aspects, areas such as neutrino and astroparticle physics, tests of the Standard Model and beyond, heavy quark physics, non-perturbative QCD, quantum gravity effects and cosmology, physics at the future accelerators, etc. are discussed.
Author: H. P. Paar
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Category :
Languages : en
Pages : 14
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Category :
Languages : en
Pages : 24
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Recent experimental results in two-photon physics are reviewed. Possibilities for future experimentation at high [gamma][gamma] collision energies are discussed. 95 refs., 12 figs., 7 tabs.
Author: Johann K. Bienlein
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Languages : de
Pages :
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Author: Hermann Kolanoski
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Category :
Languages : de
Pages : 44
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Author: F Kapusta
Publisher: World Scientific
ISBN: 981455040X
Category :
Languages : en
Pages : 358
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Book Description
Two-photon physics, i.e. photon-photon collisions in electron-positron colliders, a relatively new field in elementary particle physics, has become very popular in the last 20 years. Many experiments have been performed in this field, and the theoretical implications (in particular in quantum chromodynamics) have been studied in much detail. Nine international workshops devoted to two-photon physics have taken place between 1973 and 1992.This meeting was particularly timely, since a new generation of electron-positron colliders is presently being built or planned. These colliders will involve a large spectrum of beam energies, but their common characteristics should be a high particle flux (luminosity). This should allow for measuring many new phenomena as well as for studying known processes with much higher precision than before. Particularly promising is the prospect of building a dedicated high-energy photon collider; this should become possible using a laser technique allowing for the “conversion” of a linear electron beam into a photon beam.Over 60 physicists (both experimentalists and theorists), mainly from European countries (France, Britain, Italy, Germany, Russia, as well as Sweden and Switzerland), discussed these new possibilities at the above meeting. Over 30 talks were presented and many extended debates took place.
