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A summary of the VII snternational symposium on very high energy cosmic ray interactions
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PROCEEDINGS SUPPLEMENTS
Nuclear PhysicsB (Proc. Suppl.) 33A,B (1993) 191 North-Holland
A Summary of the VII International S y m p o s i u m on Very High Energy Cosmic Ray Interactions Lawrence W. Jones, Department of Physics, University of Michigan, Ann Arbor, MI 48109-1120 USA The Seventh International Symposium on Very High Energy Cosmic Ray Interactions was held at the University of Michigan during the week of June 22-27, 1992. This symposium was the seventh in a series begun in 1982. The purpose of these symposia has been to focus on the elementary particle and nuclear physics aspects of cosmic ray studies. As hadron colliders now overlap the energies where puzzling phenomena are reported from cosmic ray observations, this meeting was organized to provide a opportunity to bring theorists and experimentalists of the accelerator community together with the cosmic ray fraternity. The meeting opened with reports of Russian, Polish, Japanese, Brazilian, and Chinese emulsion chamber groups followed by further reports by traditional cosmic ray air shower and calorimeter groups, as well as theoretical talks by a broad spectrum of physicists. One day was devoted to nucleus-nucleus physics. Another day featured reports of puzzling phenomena, such as the "longflying component", a discussion of neutron primaries and a summary of point source observations which appear incompatible with gamma rays. There were discussions of new and planned facilities, such as the Yangbajing (Tibet) air shower array and a report on the Paris workshop concerned with a possible 5000 sq. km. array. Presentations also focused on new and planned accelerator facilities and experiments such as RHIC, the Tevatron DO experiment, the SSC F.A.D. concept, and prospects for diffractive physics studies at the Tevatron. Also included was a summary of existing accelerator data on forward inclusive particle production. The symposium closed with a talk by S.C.C. Ting summarizing LEP and L3 physics results and future plans. The emulsion chamber groups continue to report Centauro phenomena, Chirons, etc.; events of a character which have no analogue nor explanation in accelerator and collider experimental results Meanwhile, as exemplified in a talk
on CDF results and in Ting's talk on L3, the Standard Model predictions are being found reliable to incredible precision; QCD is working very well indeed. However, several speakers pointed out that, although the Tevatron energies overlap those where emulsion chambers see unusual phenomena, the regions of rapidity covered are almost mutually exclusive. Bjorken, in particular, discussed his ideas on chiral condensates and other novel concepts which may be manifest at extreme forward angles and still have totally escaped notice in "conventional" collider detectors. The nucleus-nucleus community seems to exhibit cohesion between the accelerator experimentalists and cosmic ray observers. In the quest for the elusive quark-gluon plasma, they agree in focusing on much longer duration balloon flights and on the Brookhaven RHIC facility as the next major steps. Inevitably, there was considerable discussion of primary composition beyond 100 TeV. New data from MACRO and elsewhere were reported, but the picture is still fuzzy, and will in all probability remain so until direct observations can be extended above a PeV, where balloon or satellite exposures of tens of square-metersteradian-years will be required. There was considerable discussion of atmospheric cascade processes by theorists and on the characteristics of interactions at energies up to 100 EeV. The perennial questions of the extent of breaking of Feynman scaling in the forward direction and the trend of the inelasticity coefficient with energy were discussed by many authors, and underscored the need for further, more comprehensive experiments, preferably at the Tevatron, up to the highest energies available. Beyond Bjorken's SSC F.A.D. concepts there was considerable informal discussion of possible forward physics experiments at the Fermilab Tevatron collider. The Proceedings of the Symposium will be published by the American Institute of Physics.
0920-5632/93/$06.00 © 1993- ElsevierSciencePublishers B.V. All rights reserved.
PROCEEDINGS SUPPLEMENTS
Nuclear PhysicsB (Proc. Suppl.) 33A,B (1993) 191 North-Holland
A Summary of the VII International S y m p o s i u m on Very High Energy Cosmic Ray Interactions Lawrence W. Jones, Department of Physics, University of Michigan, Ann Arbor, MI 48109-1120 USA The Seventh International Symposium on Very High Energy Cosmic Ray Interactions was held at the University of Michigan during the week of June 22-27, 1992. This symposium was the seventh in a series begun in 1982. The purpose of these symposia has been to focus on the elementary particle and nuclear physics aspects of cosmic ray studies. As hadron colliders now overlap the energies where puzzling phenomena are reported from cosmic ray observations, this meeting was organized to provide a opportunity to bring theorists and experimentalists of the accelerator community together with the cosmic ray fraternity. The meeting opened with reports of Russian, Polish, Japanese, Brazilian, and Chinese emulsion chamber groups followed by further reports by traditional cosmic ray air shower and calorimeter groups, as well as theoretical talks by a broad spectrum of physicists. One day was devoted to nucleus-nucleus physics. Another day featured reports of puzzling phenomena, such as the "longflying component", a discussion of neutron primaries and a summary of point source observations which appear incompatible with gamma rays. There were discussions of new and planned facilities, such as the Yangbajing (Tibet) air shower array and a report on the Paris workshop concerned with a possible 5000 sq. km. array. Presentations also focused on new and planned accelerator facilities and experiments such as RHIC, the Tevatron DO experiment, the SSC F.A.D. concept, and prospects for diffractive physics studies at the Tevatron. Also included was a summary of existing accelerator data on forward inclusive particle production. The symposium closed with a talk by S.C.C. Ting summarizing LEP and L3 physics results and future plans. The emulsion chamber groups continue to report Centauro phenomena, Chirons, etc.; events of a character which have no analogue nor explanation in accelerator and collider experimental results Meanwhile, as exemplified in a talk
on CDF results and in Ting's talk on L3, the Standard Model predictions are being found reliable to incredible precision; QCD is working very well indeed. However, several speakers pointed out that, although the Tevatron energies overlap those where emulsion chambers see unusual phenomena, the regions of rapidity covered are almost mutually exclusive. Bjorken, in particular, discussed his ideas on chiral condensates and other novel concepts which may be manifest at extreme forward angles and still have totally escaped notice in "conventional" collider detectors. The nucleus-nucleus community seems to exhibit cohesion between the accelerator experimentalists and cosmic ray observers. In the quest for the elusive quark-gluon plasma, they agree in focusing on much longer duration balloon flights and on the Brookhaven RHIC facility as the next major steps. Inevitably, there was considerable discussion of primary composition beyond 100 TeV. New data from MACRO and elsewhere were reported, but the picture is still fuzzy, and will in all probability remain so until direct observations can be extended above a PeV, where balloon or satellite exposures of tens of square-metersteradian-years will be required. There was considerable discussion of atmospheric cascade processes by theorists and on the characteristics of interactions at energies up to 100 EeV. The perennial questions of the extent of breaking of Feynman scaling in the forward direction and the trend of the inelasticity coefficient with energy were discussed by many authors, and underscored the need for further, more comprehensive experiments, preferably at the Tevatron, up to the highest energies available. Beyond Bjorken's SSC F.A.D. concepts there was considerable informal discussion of possible forward physics experiments at the Fermilab Tevatron collider. The Proceedings of the Symposium will be published by the American Institute of Physics.
0920-5632/93/$06.00 © 1993- ElsevierSciencePublishers B.V. All rights reserved.