scholarly journals Universal Extra Dimensions at the e- e- Colliders

2003 ◽  
Vol 18 (16) ◽  
pp. 2779-2786 ◽  
Author(s):  
Hsin-Chia Cheng
Keyword(s):  
Extra Dimension ◽  
Extra Dimensions ◽  
Supersymmetric Model ◽  
Universal Extra Dimension ◽  
Missing Energy ◽  
Cascade Decay ◽  
Two Photon ◽  
Kaluza Klein

Universal Extra Dimensions (UEDs) with compactification radius near the TeV scale provide interesting phenomenology at future colliders. The collider signals of the first Kaluza-Klein (KK) level are very similar to those of a supersymmetric model with a nearly degenerate superpartner spectrum. The heavier first level KK states cascade decay to the lightest KK particles (LKP), which is neutral and stable because of KK-parity. The signatures involve missing energy and relatively soft jets and leptons which can be difficult for detection. The KK electron signal in e-e- collisions is free from the problematic two photon background therefore provides a unique opportunity for a detailed studies of the KK electrons in the Universal Extra Dimension scenario.

Bounds on Kaluza–Klein states from EWPT and direct searches at the LHC

2015 ◽  
Vol 30 (15) ◽  
pp. 1540010 ◽  
Author(s):  
Elena Accomando
Keyword(s):  
Extra Dimension ◽  
Extra Dimensions ◽  
Hadron Collider ◽  
Universal Extra Dimension ◽  
Gauge Bosons ◽  
Particle Content ◽  
Cern Large Hadron Collider ◽  
Electroweak Precision ◽  
Precision Test ◽  
Kaluza Klein

We review the present bounds on Kaluza–Klein (KK)-excitations of Standard Model gauge bosons, predicted by TeV size extra dimensions, which have been set by the ElectroWeak Precision Test (EWPT) and recently by the direct searches performed at the CERN Large Hadron Collider (LHC). Concerning the theoretical framework we present results for the Non-Universal Extra Dimension (NUED) model with matter localized at the boundaries and all gauge bosons propagating into the bulk and acquiring KK-excitations. We also discuss its simplified version, NUED(EW), where only the ElectroWeak SM gauge bosons are allowed to propagate in the extra dimension, and its next-to-minimal version ElectroWeak Universal Extra Dimension (UED)(EW) where SU(3) is localized on the brane while the SU(2)×U(1) particle content fully propagates into the bulk.

scholarly journals Quark-flavor-changing Higgs decays from a universal extra dimension

2020 ◽  
Vol 35 (24) ◽  
pp. 2050141
Author(s):  
Carlos M. Farrera ◽  
Alejandro Granados-González ◽  
Héctor Novales-Sánchez ◽  
J. Jesús Toscano
Keyword(s):  
Standard Model ◽  
Extra Dimension ◽  
New Physics ◽  
Tree Level ◽  
Universal Extra Dimension ◽  
Loop Level ◽  
Flavor Changing ◽  
The Standard Model ◽  
The One ◽  
Kaluza Klein

Kaluza–Klein fields characterizing, from a four-dimensional viewpoint, the presence of compact universal extra dimensions would alter low-energy observables through effects determined by some compactification scale, [Formula: see text], since the one-loop level, thus being particularly relevant for physical phenomena forbidden at tree level by the Standard Model. This paper explores, for the case of one universal extra dimension, such new-physics contributions to Higgs decays [Formula: see text], into pairs of quarks with different flavors, a sort of decay process which, in the Standard Model, strictly occurs at the loop level. Finite results, decoupling as [Formula: see text], are calculated. Approximate short expressions, valid for large compactification scales, are provided. We estimate that Kaluza–Klein contributions lie below predictions from the Standard Model, being about 2 to 3 orders of magnitude smaller for compactification scales within [Formula: see text].

scholarly journals EFFECTS OF UNIVERSAL EXTRA DIMENSIONS ON HIGGS SIGNALS AT LHC

2008 ◽  
Vol 23 (06) ◽  
pp. 823-834 ◽  
Author(s):  
SANTOSH KUMAR RAI
Keyword(s):  
Higgs Boson ◽  
Large Hadron Collider ◽  
Standard Model ◽  
Extra Dimension ◽  
Extra Dimensions ◽  
Hadron Collider ◽  
Beyond The Standard Model ◽  
Universal Extra Dimension ◽  
Major Focus ◽  
The Standard Model

A major focus at the Large Hadron Collider (LHC) will be on Higgs boson studies and it would be an interesting prospect to simultaneously probe for physics beyond the Standard Model in the Higgs signals. In this work we show as to what extent, the effects of universal extra dimension (UED) can be isolated at the LHC through the Higgs signals. By doing a detailed study of the different uncertainties involved in the measurement of the rates for the process pp →h →γγ, we estimate the extent to which these uncertainties can mask the effects of the contributions coming from UED.

scholarly journals PRODUCTION RATE OF SECOND KK GAUGE BOSONS IN UED MODELS AT LHC

2009 ◽  
Vol 24 (18n19) ◽  
pp. 3515-3522
Author(s):  
SHIGEKI MATSUMOTO ◽  
JOE SATO ◽  
MASATO YAMANAKA ◽  
MASATO SENAMI
Keyword(s):  
Extra Dimension ◽  
Z Boson ◽  
Crucial Role ◽  
Hadron Collider ◽  
Universal Extra Dimension ◽  
Production Rates ◽  
Gauge Bosons ◽  
Effective Lagrangian ◽  
Scale Models ◽  
Kaluza Klein

We calculate the production rates of the second Kaluza-Klein (KK) photon γ(2) and Z boson Z(2) at the LHC including all significant processes in the minimal universal extra dimension (MUED) model. For discrimination of the MUED model from other TeV scale models in hadron collider experiments, γ(2) and Z(2) play a crucial role. In order to discuss the discrimination and calculate their production rates, we derive effective Lagrangian containing KK number violating operators. We show that KK number violating processes are extremely important for the compactification scale larger than 800 GeV. We find that, with an integrated luminosity of 100 fb-1, γ(2) and Z(2) are produced 106 - 102 for the compactification scale between 400 GeV and 2000 GeV.

scholarly journals CONSTRAINTS ON UED KK-NEUTRINO DARK MATTER FROM MAGNETIC DIPOLE MOMENTS

2007 ◽  
Vol 16 (10) ◽  
pp. 1593-1600
Author(s):  
THOMAS FLACKE ◽  
DAVID W. MAYBURY
Keyword(s):  
Dark Matter ◽  
Magnetic Dipole ◽  
Extra Dimension ◽  
Dipole Moments ◽  
Dark Matter Candidate ◽  
Universal Extra Dimension ◽  
The Standard Model ◽  
Five Dimension ◽  
The Stability ◽  
Kaluza Klein

Generically, universal extra dimension (UED) extensions of the standard model predict the stability of the lightest Kaluza–Klein (KK) particle and hence provide a dark matter candidate. For UED scenarios with one extra dimension, we model-independently determine the size of the induced five-dimension magnetic dipole moment of the KK-neutrino, ν(1). We show that current observational bounds on the interactions of dipole dark matter place constraints on UED models with KK-neutrino dark matter.

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