The twelfth Advanced Study Institute (ASI) on Techniques and Con cepts of High Energy Physics was held at the Hotel on the Cay in St. Croix, U.S. Virgin Islands in June 2002. The Institute attracted 11 lecturers and 42 advanced PhD students and recent PhD recipients in experimental particle physics from 14 different countries. The scientific program covered a broad sweep of topics that are expected to remain of interest for many years to come. The topics in this volume complement those in earlier volumes (published by Kluwer) and should be of interest to many physicists. The main financial support for the Institute was provided by the Scientific Affairs Division of the North Atlantic Treaty Organization (NATO). The Institute was eo-sponsored by the U.S. Department of Energy (DOE), the Fermi National Accelerator Laboratory (Fermilab), the U.S. National Science Foundation (NSF), the Florida State Univer sity (FSU) - Offices of the Provost and the Dean of Arts and Sciences, the Department of Physics and the FSU High Energy Physics Group - and the Institute for Theoretical and Experimental Physics (ITEP, Moscow)."

The eleventhAdvancedS tudyInstitute(ASI) on Techniquesand Con- ceptsof High Energy Physics marks thetransitionfrom anextraordinary centuryof scienceto one thatwill surely bring wonderswe can scarcely imagine.It also marks a transitionfrom its founder,theinimitableTom Ferbel,to its newdirectors . We are honoredto have beenasked to con- tinue the venerabletraditionthat Tom established. The school is his distinctivecreation , and will always bearhis mark. The 2000 meetingwas held at the Hotel on the Cay in St. Croix. It is an ideal location: sufficientlysecluded to inspire a vigorous but informal intellectualatmosphere,yet closeenough to the main island to afford opportunitiesto mingle with the locals and partakeof their hospitality.Altogether 76 physicistsboth young, and not so young, par- ticipatedfrom 18 count r ies . Forthe first time, this meetingattract ed a substantialnumber of studentsfrom EasternEurope, all of whom were warmly welcomed.The bulk of thefinancialsupportfor themeetingwas providedby the ScientificAffairs Division of the North Atlantic Treaty Organization(NATO). The ASI was co-sponsoredby the U .S. Depart- ment of Energy (DOE) , by the Fermi National Ac celeratorLaboratory (Fermilab), by the U.S . NationalS cien ceFoundation(NSF ), the Univer- sity of Rochester , Florida State University (FSU) and the Institutefor Theoreticaland ExperimentalPhysics (ITEP , Moscow). As is the tradition , the scientificprogramwas designedfor advanced graduatestudentsand recentPhD recipientsin experimentalparticle physics. The present volume covers topics that updateand comple- ment those published (by Plenum and Kluw er) for the first ten ASIs. The materi al in this volume shou ld be of interest to a wide audience of physicists.

The twelfth Advanced Study Institute (ASI) on Techniques and Con cepts of High Energy Physics was held at the Hotel on the Cay in St. Croix, U.S. Virgin Islands in June 2002. The Institute attracted 11 lecturers and 42 advanced PhD students and recent PhD recipients in experimental particle physics from 14 different countries. The scientific program covered a broad sweep of topics that are expected to remain of interest for many years to come. The topics in this volume complement those in earlier volumes (published by Kluwer) and should be of interest to many physicists. The main financial support for the Institute was provided by the Scientific Affairs Division of the North Atlantic Treaty Organization (NATO). The Institute was eo-sponsored by the U.S. Department of Energy (DOE), the Fermi National Accelerator Laboratory (Fermilab), the U.S. National Science Foundation (NSF), the Florida State Univer sity (FSU) - Offices of the Provost and the Dean of Arts and Sciences, the Department of Physics and the FSU High Energy Physics Group - and the Institute for Theoretical and Experimental Physics (ITEP, Moscow)."

The eleventhAdvancedS tudyInstitute(ASI) on Techniquesand Con- ceptsof High Energy Physics marks thetransitionfrom anextraordinary centuryof scienceto one thatwill surely bring wonderswe can scarcely imagine.It also marks a transitionfrom its founder,theinimitableTom Ferbel,to its newdirectors . We are honoredto have beenasked to con- tinue the venerabletraditionthat Tom established. The school is his distinctivecreation , and will always bearhis mark. The 2000 meetingwas held at the Hotel on the Cay in St. Croix. It is an ideal location: sufficientlysecluded to inspire a vigorous but informal intellectualatmosphere,yet closeenough to the main island to afford opportunitiesto mingle with the locals and partakeof their hospitality.Altogether 76 physicistsboth young, and not so young, par- ticipatedfrom 18 count r ies . Forthe first time, this meetingattract ed a substantialnumber of studentsfrom EasternEurope, all of whom were warmly welcomed.The bulk of thefinancialsupportfor themeetingwas providedby the ScientificAffairs Division of the North Atlantic Treaty Organization(NATO). The ASI was co-sponsoredby the U .S. Depart- ment of Energy (DOE) , by the Fermi National Ac celeratorLaboratory (Fermilab), by the U.S . NationalS cien ceFoundation(NSF ), the Univer- sity of Rochester , Florida State University (FSU) and the Institutefor Theoreticaland ExperimentalPhysics (ITEP , Moscow). As is the tradition , the scientificprogramwas designedfor advanced graduatestudentsand recentPhD recipientsin experimentalparticle physics. The present volume covers topics that updateand comple- ment those published (by Plenum and Kluw er) for the first ten ASIs. The materi al in this volume shou ld be of interest to a wide audience of physicists.