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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The cross sections for charm production in continuum e e annihilation near 10 GeV and near 30 GeV are presented. With the latest values for the D-mesons decay branching ratios, about 70% of the charm quarks end up in the D or D/sup +-/ mesons. There is no evidence for a charm deficit. The relative production of the vector and pseudoscalar mesons is in accord with the expectations of spin counting. Measurements of the D* decay angular distribution show that the vector mesons are primarily produced with equal populations in all helicity states, although there is some evidence for D* alignment for the highest D* momenta in the 10 GeV data. 13 refs., 4 figs., 1 tab.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The cross sections for charm production in continuum e e annihilation near 10 GeV and near 30 GeV are presented. With the latest values for the D-mesons decay branching ratios, about 70% of the charm quarks end up in the D or D/sup +-/ mesons. There is no evidence for a charm deficit. The relative production of the vector and pseudoscalar mesons is in accord with the expectations of spin counting. Measurements of the D* decay angular distribution show that the vector mesons are primarily produced with equal populations in all helicity states, although there is some evidence for D* alignment for the highest D* momenta in the 10 GeV data. 13 refs., 4 figs., 1 tab.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Results are presented on the analysis of charm D Production from 300 pb−1 of data taken with the HRS Detector at PEP. The electroweak asymmetry is -8.4 +- 3.6% and R (D + D*) = 1.57 +- 0.17. Fragmentation functions for D°, D, D* production and the results of a search for the D** are given. 10 refs., 9 figs.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Inclusive)psi) production in ee/sup)minus/) annihilation at 29 GeV has been measured with the Mark II detector. The)psi) cross section is found to be 1.1)+- ) 0.5)+- ) 0.4 pb. An upper limit of 0.02 sigma/sub .mu mu./ is obtained for other sources of)psi) production.)eta) production has also been investigated, using the .gamma gamma. decay mode. The)eta) fragmentation function has been measured and found to be in good agreement with the Lund model prediction.)eta)' production has been measured for the first time in high energy ee/sup)minus/) annihilation. A search for D/sub s//sup)+-/) decays into)eta) .pi./sup)+-/) and)eta)' .pi./sup)+-/) has been performed and evidence has been found for both decay modes at the 3 sigma level. 11 refs., 5 figs.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Evidence is presented that a new particle, a narrow resonance of mass 1865 MeV/c2, and its associated excited state can be identified with the (D°, D/sup +/) and (D*°, D*/sup +/) doublets of charm theory. The D production in e−e/sup +/ annihilation and various properties of the decay modes are considered. 54 references. (JFP).
Author: Antonio L. Zichichi Publisher: Springer Science & Business Media ISBN: 146133506X Category : Science Languages : en Pages : 1098
Book Description
During August 1980 a group of 85 physicists from 57 laboratories in 21 countries met in Erice for the 18th Course of the International School of Subnuclear Physics. The countries represented were Argentina, Austria, Belgium, Bulgaria, Canada, China, Colombia, Czechoslovakia, the Federal Republic of Germany, France, Hungary, Israel, Italy, Japan, the Netherlands, Poland, Spain, Switzerland, the United Kingdom, the United States of America, and Yugoslavia. The School was sponsored by the Italian Ministry of Public Education (MFI) , the Italian Ministry of Scientific and Technological Research (MRST) , the Regional Sicilian Government (ERS), and the Weizmann Institute of Science. The programme of the School was mainly devoted to a review of the very low energy corner where we are all working at present, and to a discussion of what the future could be for subnuclear physics before the end of this century. On the theoretical front, the highlight of this Course was the lectures by S. Adler on the non-local U(2) gauge theory. The non locality at the colour-level should disappear at the colour-singlet level -- where all particles we know of exist and should the- fore not scare those who do not like the idea of giving up this basic principle of quantum field theory: locality. On the other hand, the great dream of producing the world where we live, starting from the simplest symmetry group U(2), now seems to have a good chance of becoming a reality.
Author: Helmut Satz Publisher: Springer Science & Business Media ISBN: 3642239072 Category : Science Languages : en Pages : 245
Book Description
The thermodynamics of strongly interacting matter has become a profound and challenging area of modern physics, both in theory and in experiment. Statistical quantum chromodynamics, through analytical as well as numerical studies, provides the main theoretical tool, while in experiment, high-energy nuclear collisions are the key for extensive laboratory investigations. The field therefore straddles statistical, particle and nuclear physics, both conceptually and in the methods of investigation used. This course-tested primer addresses above all the many young scientists starting their scientific research in this field, providing them with a general, self-contained introduction that emphasizes in particular the basic concepts and ideas, with the aim of explaining why we do what we do. To achieve this goal, the present text concentrates mainly on equilibrium thermodynamics: first, the fundamental ideas of strong interaction thermodynamics are introduced and then the main concepts and methods used in the study of the physics of complex systems are summarized. Subsequently, simplified phenomenological pictures, leading to critical behavior in hadronic matter and to hadron-quark phase transitions are introduced, followed by elements of finite-temperature lattice QCD leading to the important results obtained in computer simulation studies of the lattice approach. Next, the relation of the resulting critical behavior to symmetry breaking/restoration in QCD is clarified before the text turns to the study of the QCD phase diagram. The presentation of bulk equilibrium thermodynamics is completed by studying the properties of the quark-gluon plasma as new state of strongly interacting matter. The final chapters of the book are devoted to more specific topics which arise when nuclear collisions are considered as a tool for the experimental study of QCD thermodynamics.
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Author: Gianpaolo Bellini
Author: Raymond Edward Frey
Author: Petros-Afentoulis Rapidis
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Author: Antonio L. Zichichi
Author: Helmut Satz
Author: Betty Puifun Kwan