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Extra Dimensions: Exploring New Frontiers in Physics

Discover the latest research on extra dimensions, including compositeness, technicolor, and Chiral e* contributions to e+e- -> γγ processes. Explore models of extra dimensions, from compactified torus to TeV scale dimensions, and learn about various methods of investigation. Updated for the 2004 edition with new data tables and minor revisions.

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Extra Dimensions: Exploring New Frontiers in Physics

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  1. CompositenessTanabashi, TerningTechnicolorTanabashi, TerningExtra DimensionsGherghetta, Kolda

  2. Technicolor/Compositeness Tanabashi & Terning • Chiral e* contribution to the (e+e- ). Tanabashi found an error in the fomula adopted by LEP2 papers (EPJC26,331 (2003) from OPAL, and EPJC28 1 (2003) from ALEPH) so we could not use these papers. • Loop-level constraint of e* (e.g. lepton g - 2). Probably should be in compositeness mini-review. • It would be useful to decide on a straw-man technicolor model.

  3. Extra Dimensions (Chris Kolda) Since 1998, the idea of extra dimensions opening up at observable scales has gained currency and generated 1000’s of papers. Several models exist, include the original case of d flat dimensions compactified on a torus, with all Standard Model fields confined to a 3-brane. (Arkani-Hamed, Dimopoulos, Dvali) Alternatives include universal extra dimensions at the TeV scale, and Randall-Sundrum extra dimensions near the Planck scale. Many different models of each class exist!

  4. Section first appeared in the 2002 edition of the RPP. • Management team changed for ‘04 edition: • Overseer: C. Kolda • Encoders: T. Gherghetta and J. March-Russell • Review by J. Hewett and J. March-Russell • Goal: Give bounds which are general enough to apply across broad spectrum of models  This is the biggest challenge for the section, since so many papers are bounds on only some highly specific scenario.

  5. The Physics of Extra Dimensions There are a number of ways to look for extra dimensions: • Deviations from Newtonian gravity at short distances. Sensitive to extra dims with radii down to about 0.2mm.(NEW TABLE) • On-shell Kaluza-Klein (KK) graviton production at a collider(ppj+G, e+e- +G)or in stellar processes (supernova cooling, etc). Astro bounds are R are extremely powerful, usually orders better than lab bounds. [This table is newly split between the cases d=2 and d>2.]

  6. Exchange of tower of KK gravitons in Standard Model processes (e+e- ,, etc). These bounds are more model-dependent since they depend on the way in which the divergences in field theories with D>4 are cut off. Bounds are given for MTT, the effective cut-off scale of the theory. Most lower bounds are in the 0.5 to 0.8 TeV range. • Direct limits on string or gravitational scale added. (NEW TABLE) • Section added for bounds related to universal extra dimensions at the TeV scale. (NEW TABLE)

  7. Several tables from 2002 edition were combined or reconfigured, and other new tables were added. A total of 31 new entries since the ’02 edition have been included in the tables for the 2004 edition. Only minor revisions (new data added) to the mini-review. For next edition more thorough changes will be made to more closely correlate text with data tables.

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