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Title: Resonances from two universal extra dimensions

Abstract

Standard model gauge bosons propagating in two universal extra dimensions give rise to heavy spin-1 and spin-0 particles. The lightest of these, carrying Kaluza-Klein numbers (1,0), may be produced only in pairs at colliders, whereas the (1,1) modes, which are heavier by a factor of {radical}2, may be singly produced. We show that the cascade decays of (1,1) particles generate a series of closely-spaced narrow resonances in the t{bar t} invariant mass distribution. At the Tevatron, s-channel production of (1,1) gluons and electroweak bosons will be sensitive to t{bar t} resonances up to masses in the 0.5-0.7 TeV range. Searches at the LHC for resonances originating from several higher-level modes will further test the existence of two universal extra dimensions.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
892451
Report Number(s):
FERMILAB-PUB-06-009-T
arXiv eprint number hep-ph/0601186; TRN: US0701384
DOE Contract Number:
AC02-76CH03000
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys.Rev.D74:075008,2006
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BOSONS; DIMENSIONS; FERMILAB TEVATRON; GLUONS; MASS DISTRIBUTION; PRODUCTION; S CHANNEL; STANDARD MODEL; TEV RANGE; UNINTERRUPTIBLE POWER SUPPLIES; Phenomenology-HEP

Citation Formats

Burdman, Gustavo, /Sao Paulo U., Dobrescu, Bogdan A., /Fermilab, Ponton, Eduardo, and /Columbia U.. Resonances from two universal extra dimensions. United States: N. p., 2006. Web. doi:10.1103/PhysRevD.74.075008.
Burdman, Gustavo, /Sao Paulo U., Dobrescu, Bogdan A., /Fermilab, Ponton, Eduardo, & /Columbia U.. Resonances from two universal extra dimensions. United States. doi:10.1103/PhysRevD.74.075008.
Burdman, Gustavo, /Sao Paulo U., Dobrescu, Bogdan A., /Fermilab, Ponton, Eduardo, and /Columbia U.. Sun . "Resonances from two universal extra dimensions". United States. doi:10.1103/PhysRevD.74.075008. https://www.osti.gov/servlets/purl/892451.
@article{osti_892451,
title = {Resonances from two universal extra dimensions},
author = {Burdman, Gustavo and /Sao Paulo U. and Dobrescu, Bogdan A. and /Fermilab and Ponton, Eduardo and /Columbia U.},
abstractNote = {Standard model gauge bosons propagating in two universal extra dimensions give rise to heavy spin-1 and spin-0 particles. The lightest of these, carrying Kaluza-Klein numbers (1,0), may be produced only in pairs at colliders, whereas the (1,1) modes, which are heavier by a factor of {radical}2, may be singly produced. We show that the cascade decays of (1,1) particles generate a series of closely-spaced narrow resonances in the t{bar t} invariant mass distribution. At the Tevatron, s-channel production of (1,1) gluons and electroweak bosons will be sensitive to t{bar t} resonances up to masses in the 0.5-0.7 TeV range. Searches at the LHC for resonances originating from several higher-level modes will further test the existence of two universal extra dimensions.},
doi = {10.1103/PhysRevD.74.075008},
journal = {Phys.Rev.D74:075008,2006},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}
  • Standard model gauge bosons propagating in two universal extra dimensions give rise to heavy spin-1 and spin-0 particles. The lightest of these, carrying Kaluza-Klein numbers (1,0), may be produced only in pairs at colliders, whereas the (1,1) modes, which are heavier by a factor of {radical}(2), may be singly produced. We show that the cascade decays of (1,1) particles generate a series of closely-spaced narrow resonances in the tt invariant mass distribution. At the Tevatron, s-channel production of (1,1) gluons and electroweak bosons will be sensitive to tt resonances up to masses in the 0.5-0.7 TeV range. Searches at themore » LHC for resonances originating from several higher-level modes will further test the existence of two universal extra dimensions.« less
  • We explore the properties of dark matter in theories with two universal extra dimensions, where the lightest Kaluza-Klein state is a spin-0 neutral particle, representing a six-dimensional photon polarized along the extra dimensions. Annihilation of this 'spinless photon' proceeds predominantly through Higgs boson exchange, and is largely independent of other Kaluza-Klein particles. The measured relic abundance sets an upper limit on the spinless photon mass of 500 GeV, which decreases to almost 200 GeV if the Higgs boson is light. The phenomenology of this dark matter candidate is strikingly different from Kaluza-Klein dark matter in theories with one universal extramore » dimension. Elastic scattering of the spinless photon with quarks is helicity suppressed, making its direct detection challenging, although possible at upcoming experiments. The prospects for indirect detection with gamma rays and antimatter are similar to those of neutralinos. The rates predicted at neutrino telescopes are below the sensitivity of next-generation experiments.« less
  • We study the ILC phenomenology of Kaluza-Klein (KK) modes along two universal extra dimensions compactified on the chiral square. We compute production cross sections of various (1, 0) particles at the ILC with (s){sup 1/2} = 1 TeV, focusing on decays of KK-leptons and the KK partner of the hypercharge gauge boson down to the 'spinless photon', which is the lightest KK particle. We contrast this model to one universal extra dimension with KK-photon (spin-1) and supersymmetry with neutralino (spin-1/2) or gravitino (spin-3/2) dark matter. We also investigate the discovery potential for (1, 1) KK bosons as s-channel resonances.
  • No abstract prepared.
  • We calculate the leading order corrections to the B{yields}X{sub s}{gamma} decay in the standard model with two large flat universal extra dimensions. We find that the contributions involving the exchange of Kaluza-Klein modes of the physical scalar field a{sub (kl)}{sup {+-}} depend logarithmically on the ultraviolet cutoff scale {lambda}. We emphasize that all flavor-changing neutral current transitions suffer from this problem. Although the ultraviolet sensitivity weakens the lower bound on the inverse compactification radius 1/R that follows from B{yields}X{sub s}{gamma}, the constraint remains stronger than any other available direct measurement. After performing a careful study of the potential impact ofmore » cutoff and higher-order effects, we find 1/R>650 GeV at 95% confidence level if errors are combined in quadrature. Our limit is at variance with the parameter region 1/R < or approx. 600 GeV preferred by dark matter constraints.« less