LBL-91 Revised UC-414 August 1994 CURRENT EXPERIMENTS IN ELEMENTARY PARTICLE PHYSICS Particle Data Group H. Galic Stanford Linear Accelerator Cent'r, Stanford University, Stanford, CA 94305 USA F.E. Armstrong (Technical Associate) Particle Data Group, Lawrence Berkeley Laboratory, Berkeley, CA 94720, USA B. von Przewoski Indiana University Cyclotron Facility, Bloomington , IN 47408'. USA V.I. Klyukhin, Yu.G. Ryabov Institute for High Energy Physics, RU-142284 Protvino, Moscow Region, Russia S.V. Bilak, N.S. Illarionova Institute of Theoretical and Experimental Physics, RU-117259 Moscow, Russia O. B. Van Dyck Los Alamos National Laboratory, Los Alamos, NM 87545, USA R. Frosch Paul Schemer Institute, CH-5232 Villigen PSI, Switzerland F. Lehar DPhPE-SEPh, CEN Saclay, F-91190 Gif-sur-Yvette, France Y. Oyanagi Faculty of Sciences, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan Abstract - This report contains summaries of 568 current and recent experiments in elementary particle physics. Experiments that finished taking data before 1988 are excluded. Included are experiments at BEPC (Beijing), BNL, CEBAF, CERN, CESR, DESY, FNAL, INS (Tokyo), ITEP (Moscow), IUCF (Bloomington), KEK, LAMPF, Novosibirsk, PNPI (St. Petersburg), PSI, Saclay, Serpukhov, SLAC, and TRIUMF, and also several underground and underwater experiments. Instructions are given for remote searching of the computer database (maintained under the SLAC/SPIRES system) that contains the summaries. The publication of this report is supported by the Director, Office of Energy Research, Office of High Energy and Nuclear Physics, Division of High Energy Physics of the U.S. Department of Energy under Contract No. DE-AC03- 76SF00098, and by the U.S. National Science Foundation under Agreement No. PHY-9320551. Partial funding to cover the cost of the publication is also provided by an implementing arrangement between the governments of Japan (Morhusho) and the United States (DOE) on cooperative research and development. H. Galic is partially supported by the Particle Data Group, and partially by the U.S. Department of Energy under Contract No. DE-AC03-76SF00515. EASIER DISTRIBUTION OF TH.S DOCUMENT IS UNLIMITED ii TABLE OF CONTENTS Introduction 1 Searching the EXPERIMENTS computer database 3 Indices to the summaries Beam-target momentum 7 Spokesperson 14 Abbreviations used in the summaries Journals 20 Kinematic variables 21 Accelerators 21 Detectors 22 Summaries of experiments BEPC (Beijing) 25 BNI 25 CEBAF 43 CERN 53 CESR 83 DESY 85 FNAL 88 INS (Tokyo) 106 ITEP (Moscow) 110 IUCF (Bloomington) 116 KEK 120 LAMPF 126 Novosibirsk 133 PNPI (St. Petersburg) 134 PSI 135 Saclay 140 Serpukhov 147 SLAC 156 TRIUMF 161 Underground/Underwater 169 iii iv INTRODUCTION This report contains summaries of 568 approved current and recent experiments in elementary particle physics. A glance at the summaries in the body of the report will show the kind of information given. Experiments at the following laboratories are included: BEPC (Beijing) LAMPF (Los Alamos) BNL (Brookhaven) Novosibirsk (Inst, of Nucl. Phys.) CEBAF (Newport News) PNPI (Nucl. Phys. Inst., St. Petersburg) CERN (Geneva) PSI (Paul Scherrer Inst., Villigen) CESR (Cornell U.) SATURNE (Saclay) DESY (Hamburg) Serpukhov (Inst, of High Energy Phys.) FNAL (Batavia) SLAC (Stanford U.) INS (Inst, for Nucl. Study, Tokyo) TRIUMF (Vancouver) ITEP (Inst, of Theor. & Exp. Phys., Moscow) Underground experiments IUCF (Indiana U.) Underwater experiments KEK (Tsukuba) We exclude experiments for which the data collection was completed before 1988. The rationale for thus including many rather old experiments is that many of them are still producing papers; note that a summary includes a list of journal papers resulting from the experiment. We also exclude experiments mostly of interest to nuclear physicists, dealing with nuclear levels or other nuclear-structure measurements. There are of course experiments at the fuzzy borderline between particle and nuclear physics, and we have tried to make sensible choices about what experiments to include here. Sources of information — Our first information about an experiment usually comes from the proposal for the experiment. Then we follow the progress of the experiment as best we can in laboratory reports such as "Experiments at CERN." Finally, a few months before an edition of this report is to appear, we send copies of the summaries of the experiments to the spokespersons for checking and updating. If a reply is received — as was the case in more than two-thirds of the experiments — there is a "*' " next to the spokesperson on the summary. Since current experiments are often in flux, we rely heavily on these replies to be up to date: no • by the spokesperson means the summary may be inaccurate or incomplete. (For a handful of experiments, we verified our information with a local member of the experiment, not the spokesperson, but for simplicity put a v by the spokesperson. For experiments with more than one spokesperson, all the spokespersons are checked even if only one of them replied.) Computer database -- This report is produced from a computer database maintained at SLAC under the SPIRES database management system. The database, named EXPERIMENTS, also contains information from earlier editions of this report about many experiments completed before 1988 (going back to about 1975, and including experiments at Argonne and Rutherford). See page 3 for a guide to using the EXPERIMENTS database via the remote server QSPIRES and World-Wide-Web (WWW). Summaries — Each summary lists several dates related to the experiment: the date of the proposal, the approval date, and when the data-taking began and was completed. The title of the proposal and the most recent list of participants are given. The detector used in the experiment is identified either by a generic name (e.g., counter) or by a widely known acronym (e.g., SLD). The most important reactions and particles studied and the beam energy or momentum are listed where known. A brief comment describing the apparatus and the main goals of the experiment may follow. A summary ends with a list of any journal articles on results or instrumentation of 1 the experiment and a list of related experiments, similar either by methods used or by a subject of study. Where known, an e-mail contact address and the WWW uniform resource locator (URL) are given. Abbreviations — To keep the summaries brief, abbreviations are used to indicate journals, kinematic variables, accelerators, and detectors. The abbreviations are usually obvious but are defined near the beginning of the report. The abbreviated forms are needed for searching the EXPERIMENTS database online. Acknowledgments — M. Doran, G. Harigel and M. Varela Diaz (CERN), P. Yamin (BNL), J. Parker (Fermilab), and D. Buckle (CEBAF) kindly provided computer files with data on ex­ periments from their respective institutions. We thank G.S. Wagman (LBL) for his help with processing the database. We also thank the hundreds of spokespersons who took the time to reply to our inquiries. Comments and requests — We invite comments pointing out omissions, obscurities, out- of-date information, and errors. We also encourage spokespersons to send us proposals and letters of intent of their future experiments. Comments and other material should be sent to: EXPERIMENTS (c/o H. Galic) SLAC Library, Mail-Stop 82 SLAC, P.O. Box 4349 Stanford, CA 94309, USA e-mail: [email protected] Requests for additional copies of this report from the Americas, Australasia, and the Far East should go to: EXPERIMENTS Particle Data Group (50-308) Lawrence Berkeley Laboratory Berkeley, CA 94720, USA Requests from other areas should go to: CERN Scientific Information Service CH-1211 Geneva 23 Switzerland 2 SEARCHING THE "EXPERIMENTS" DATABASE VIA QSPIRES SERVER AND WWW The summaries of current and many earlier experiments related to particle physics are contained in a computer database called EXPERIMENTS, maintained at SLAC under the SPIRES database management system. You can access the EXPERIMENTS database even if you do not have a computer account at SLAC. In the first part of the section we discuss the e-mail searching of the database via the remote server QSPIRES. Note that authorization for QSPIRES searching is no longer required. An extensive Guide to QSPIRES is available from the SLAC Publication Department (see the address below). In the second part of the section we describe the access to EXPERIMENTS via a hypermedia-based Internet tool for accessing information worldwide, the World-Wide-Web (WWW). Some other computer-reachable sources of interest to experimental physicists are mentioned in the concluding paragraphs. E-mail QSPIRES searching — You may reach the QSPIRES server at SLAC through e-mail, by sending a message to [email protected] or to [email protected] . Leave the subject line in the header of your letter empty, and send only one search request per letter. A search request should have the form < your-search-command > (IN EXPERIMENTS for example, FIND TITLE SPIN TRANSFER (IN EXPERIMENTS QSPIRES will answer through e-mail as soon as it gets your message. Even if a search result is zero, you will still receive an answer ("No records found which match search criteria"). If, on the contrary, a search result contains too many records, QSPIRES may send you a warning to reformulate your request by adding more criteria. It is in your best interest to avoid ordering too many records: big files travel relatively slowly and may even get lost at some gateways. Therefore, be sure that your search request is as detailed as possible by combining several search criteria. For example, change the above command by adding the accelerator's name, FIN TITLE SPIN TRANSFER AND AC TRIUMF (IN EXPERIMENTS If you add the word 'RESULT' after the phrase '(IN EXPERIMENTS' , the server will send you only the information on the number of retrieved records, but not the records themselves.