The Particle Physics Group (PDG) is an "international collaboration that reviews particle physics and related areas of Astrophysics, and compiles/analyzes data on particle properties." The Web site features the 2002 publication, The Review of Particle Physics, which is described as "the most cited publication in particle physics during the last decade." Visitors have access to summary tables and...

This Topic in Depth begins with a Web site from the Stanford Linear Accelerator Center called Theory: Quarks (1). The one-page offering contains a basic explanation of what quarks are, their masses, and how they're known to be real. Critical words within the page, such as flavor and hadron, are linked to a handy online glossary of terms. The second site is presented by the Particle Data Group of...

This Web site contains the virtual version of ScienceTunnel, a museum exhibit currently at the Museum of Science and Industry in Manchester, England. Created by the Max-Planck-Society, ScienceTunnel invites visitors to "travel through the dimensions of this world and onward to the outskirts of our knowledge." Visitors explore twelve orders of magnitude, from the composition of subatomic particles...

This website features the ALICE (A Large Ion Collider Experiment) collaboration's aim to "study the physics of strongly interacting matter at extreme energy densities, where the formation of a new phase of matter, the quark-gluon plasma, is expected." The Public section of the website features the construction plan for the detector located at CERN, which will be optimized for heavy-ion physics....

This topic in depth tackles the complex concept of antimatter. First, Wikipedia (1) provides a simple, concise explanation of antimatter and discusses scientists' successes in producing anti-atoms of hydrogen and anti-deuteron nuclei. This online encyclopedia also offers links to many of the physical terms related to the topic so that novices can easily understand the material presented. The...

ZEUS is a collaboration of 450 physicists who are operating a large particle detector at the electron-proton collider HERA at the DESY laboratory in Hamburg. Researchers can find links to the ZEUS physics groups including High Q2, Diffraction and Vector Mesons, and Heavy Flavour Physics. Along with other tasks and components, visitors can learn about the Backing Calorimeter's role in preserving...

The Interactions.org website serves as a hub for news, information, images, and links for particle physicists. Educators and students can find a sizeable image collection and short videos and animations describing the research and history of key physics institutions. Researchers can discover a global data grid and a database of talks in cosmic physics, linear collider, ethics and science, and...

The Phenomenology Institute at the University of Wisconsin-Madison pursues "a broad range of research in particle physics theory and phenomenology." At this website, users can view concise summaries of its many focuses including in neutrino physics, string theory and extra dimensions, and electroweak physics. Visitors can find links to the homepages of many of the researchers involved with the...

This Fermilab website offers physicists the chance to educate individuals about the "fundamental particles and forces of our universe." The website offers a database containing over 250 hands-on activities, special events, research participation, and other educational and outreach programs. The information can be searched by state, audience, and institution. The database offers a brief description...

Yesterday, scientists from 20 different countries working at CERN, the European Laboratory for Particle Physics, announced that, after years of work, they had created "a new state of matter." In this new state of matter, quarks, the smallest known particles, roam freely instead of being bound up into more complex particles such as protons and neutrons. By smashing heavy lead ions at temperatures...