D Meson Production In Ee Annihilation 3 7 To 7 0 Gev Total Cross Section Branching Ratio

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D Meson Production In Ee Annihilation 3 7 To 7 0 Gev Total Cross Section Branching Ratio

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Author :
language : en
Publisher:
Release Date : 1979

D Meson Production In Ee Annihilation 3 7 To 7 0 Gev Total Cross Section Branching Ratio written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.

The production of D mesons in ee− annihilation for the center-of-mass energy range 3.7 to 7.0 GeV was studied with the MARK I magnetic detector at SPEAR. A resonance was observed in the total cross section for hadron production in ee− annihilation at an energy just above the threshold for charm production. This resonance, which is named psi'', has a mass of 3772 +- 6 MeV/c2, a total width of 28 +- 5 MeV/c2, a partial width to electron pairs of 345 +- 85 eV/c2, and decays almost exclusively into D anti D pairs. The psi'' provides a rich source of background-free and kinematically well defined D mesons for study. From produced in the decay of the psi'' the masses of the D° and D/sup +/ mesons were determined to be 1863.3 +- 0.9 MeV/c2 and 1868.3 +- 0.9 MeV/c2 respectively. Also the branching fractions for D° decay to K−.pi./sup +/, anti K°.pi./sup +/.pi.− and K−.pi./sup +/.pi.−.pi./sup +/ were determined to be (2.2 +- 0.6)%, (4.0 +- 1.3)%, and (3.2 +- 1.1)% and the branching fractions for D/sup +/ decay to anti K°.pi./sup +/ and K−.pi./sup +/.pi./sup +/ to be (1.5 +- 0.60)% and (3.9 +- 1.0)%. The average number of kaons per D decay was found to be 0.52 +- 0.14 K°'s and 0.42 +- 0.12 K/sup +/'s. The rate for inclusive production of D mesons at center-of-mass energies above the psi'' was measured; it is found that it can account for most, if not all, of the observed increase in the total hadronic cross-section for center-of-mass energies above 4 GeV. The inclusive momentum and energy spectra for D's were measured at the highest available center-of-mass energy (7 GeV). The energy spectra are rapidly decreasing functions of energy with a slope similar to the slope of the charged pion spectrum at the same center-of-mass energy. This behavior suggests that the fragmentation function of the charmed quark into charmed mesons is a decreasing function of the scaling variable z = 2E/sub D//E/sub CM/. 81 references.

Nuclear Science Abstracts

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Author :
language : en
Publisher:
Release Date : 1974

Nuclear Science Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Nuclear energy categories.

Energy Research Abstracts

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Author :
language : en
Publisher:
Release Date : 1988

Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Power resources categories.

High Energy Physics Index

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Author :
language : en
Publisher:
Release Date : 1993

High Energy Physics Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Particles (Nuclear physics) categories.

Inis Atomindex

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Author :
language : en
Publisher:
Release Date : 1986

Inis Atomindex written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Nuclear energy categories.

Physics Briefs

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Author :
language : en
Publisher:
Release Date : 1992

Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Physics categories.

Soviet Journal Of Nuclear Physics

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Author :
language : en
Publisher:
Release Date : 1982

Soviet Journal Of Nuclear Physics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Nuclear physics categories.

Reflections On Experimental Science

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Author : Martin L. Perl
language : en
Publisher: World Scientific
Release Date : 1996

Reflections On Experimental Science written by Martin L. Perl and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Science categories.

This is a collection of important lecture and original articles and commentaries by Martin Perl, discoverer of the tau lepton and the third generation of elementary particles, and this year's Nobel Prize winner. This book contains a fascinating and realistic picture of experimental science based on the high energy physics research work carried out by him. Using reprints of his articles with his commentaries, the author presents the various aspects of experimental research in science: the pleasures and risks of experimental work; the pain and frustration with experiments that are useless or fail; the dreaming about experiments that were not carried out; the constant search for innovation and creativity in the work; and the special joy of discovery. The articles and commentaries range from the early days of bubble chambers and spark chambers in the 1950's to the author's present research, experiments at an electron-positron collider and a search for free quarks. The book is for the general reader as well as the scientist.

Proceedings Of Summer Institute On Particle Physics July 18 29 1983

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Author : Patricia M. McDonough
language : en
Publisher:
Release Date : 1984

Proceedings Of Summer Institute On Particle Physics July 18 29 1983 written by Patricia M. McDonough and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Dynamics categories.

Erda Energy Research Abstracts

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Author :
language : en
Publisher:
Release Date : 1983

Erda Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Power resources categories.