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Title: Improved bounds on universal extra dimensions and consequences for Kaluza-Klein dark matter

Abstract

We study constraints on models with a flat universal extra dimension in which all standard model fields propagate in the bulk. A significantly improved constraint on the compactification scale is obtained from the extended set of electroweak precision observables accurately measured at LEP1 and LEP2. We find a lower bound of M{sub c}{identical_to}R{sup -1}>700(800) GeV at the 99% (95%) confidence level. We also discuss the implications of this constraint on the prospects for the direct and indirect detection of Kaluza-Klein dark matter in this model.

Authors:
 [1];  [2];  [3];  [1];  [4]
  1. Rudolf Peierls Center for Theoretical Physics, 1 Keble Road, Oxford University, Oxford OX1 3NP (United Kingdom)
  2. Fermi National Accelerator Laboratory, Theoretical Astrophysics Center, Batavia, Illinois 60510 (United States)
  3. (United Kingdom)
  4. (United States)
Publication Date:
OSTI Identifier:
20783016
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 73; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.73.095002; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; COMPACTIFICATION; DETECTION; GEV RANGE; KALUZA-KLEIN THEORY; LEP STORAGE RINGS; NONLUMINOUS MATTER; PARTICLE IDENTIFICATION; STANDARD MODEL

Citation Formats

Flacke, Thomas, Hooper, Dan, Astrophysics Department, Oxford University, Oxford OX1 3RH, March-Russell, John, and Department of Physics, University of California, Davis, California 95616. Improved bounds on universal extra dimensions and consequences for Kaluza-Klein dark matter. United States: N. p., 2006. Web. doi:10.1103/PHYSREVD.73.095002.
Flacke, Thomas, Hooper, Dan, Astrophysics Department, Oxford University, Oxford OX1 3RH, March-Russell, John, & Department of Physics, University of California, Davis, California 95616. Improved bounds on universal extra dimensions and consequences for Kaluza-Klein dark matter. United States. doi:10.1103/PHYSREVD.73.095002.
Flacke, Thomas, Hooper, Dan, Astrophysics Department, Oxford University, Oxford OX1 3RH, March-Russell, John, and Department of Physics, University of California, Davis, California 95616. Mon . "Improved bounds on universal extra dimensions and consequences for Kaluza-Klein dark matter". United States. doi:10.1103/PHYSREVD.73.095002.
@article{osti_20783016,
title = {Improved bounds on universal extra dimensions and consequences for Kaluza-Klein dark matter},
author = {Flacke, Thomas and Hooper, Dan and Astrophysics Department, Oxford University, Oxford OX1 3RH and March-Russell, John and Department of Physics, University of California, Davis, California 95616},
abstractNote = {We study constraints on models with a flat universal extra dimension in which all standard model fields propagate in the bulk. A significantly improved constraint on the compactification scale is obtained from the extended set of electroweak precision observables accurately measured at LEP1 and LEP2. We find a lower bound of M{sub c}{identical_to}R{sup -1}>700(800) GeV at the 99% (95%) confidence level. We also discuss the implications of this constraint on the prospects for the direct and indirect detection of Kaluza-Klein dark matter in this model.},
doi = {10.1103/PHYSREVD.73.095002},
journal = {Physical Review. D, Particles Fields},
number = 9,
volume = 73,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2006},
month = {Mon May 01 00:00:00 EDT 2006}
}
  • We study constraints on models with a flat 'Universal' Extra Dimension in which all Standard Model fields propagate in the bulk. A significantly improved constraint on the compactification scale is obtained from the extended set of electroweak precision observables accurately measured at LEP1 and LEP2. We find a lower bound of M{sub c} = R{sup -1} > 700 (800) GeV at the 99% (95%) confidence level. We also discuss the implications of this constraint on the prospects for the direct and indirect detection of Kaluza-Klein dark matter in this model.
  • We show that in a class of universal extra dimension models (UED), which solves both the neutrino mass and proton decay problem, an admixture of Kaluza-Klein (KK) photon and KK right-handed neutrinos can provide the required amount of cold dark matter (CDM). This model has two parameters R{sup -1} and M{sub Z{sup '}} (R is the radius of the extra space dimensions and Z{sup '} the extra neutral gauge boson of the model). Using the value of the relic CDM density, combined with the results from the cryogenic searches for CDM, we obtain upper limits on R{sup -1} of aboutmore » 400-650 GeV and M{sub Z{sup '}}{<=}1.5 TeV, both being accessible to the LHC. In some regions of the parameter space, the dark matter-nucleon scattering cross section can be as high as 10{sup -44} cm{sup 2}, which can be probed by the next round of dark matter search experiments.« less
  • If large extra dimensions exist in nature, supernova (SN) cores will emit large fluxes of Kaluza-Klein gravitons, producing a cosmic background of these particles with energies and masses up to about 100MeV. Radiative decays then give rise to a diffuse cosmic {gamma} -ray background with E{sub {gamma}}{approx}<100 MeV which is well in excess of the observations if more than 0.5%--1% of the SN energy is emitted into the new channel. For two extra dimensions we derive a conservative bound on their radius of R{approx}<0.9 x 10{sup -4} mm ; for three extra dimensions it is R{approx}<1.9 x 10{sup -7} mmmore » .« less
  • In the universal extra-dimensions models, Kaluza-Klein excitations of matter are generally produced in pairs. However, if matter lives on a fat brane embedded in a larger space, gravity-matter interactions do not obey KK number-conservation, thus making possible the production of single KK excitations at colliders. We evaluate the production rates for such excitations at the Tevatron and LHC colliders, and look for ways to detect them.
  • In models with universal extra dimensions, the isosinglet Kaluza-Klein (KK) quarks (q{sup 1}) have very narrow widths, of O(5-10) MeV, and will thus hadronize. Studies of KK quarkonia (q{sup 1}q{sup 1}) show very sharp resonances and dramatic signatures at the linear collider. In this Brief Report, we consider the possibility of detecting KK mesons (q{sup 1}q), and show that detection at a linear collider is unlikely.