scholarly journals Z boson decay to photon plus Kaluza-Klein graviton in large extra dimensions

2007 ◽  
Vol 2007 (11) ◽  
pp. 089-089 ◽  
Author(s):  
Benjamin C Allanach ◽  
Jordan P Skittrall ◽  
K Sridhar
Keyword(s):  
Z Boson ◽  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
Kaluza Klein

scholarly journals COSMOLOGICAL CONSTANT PROBING SHAPE MODULI THROUGH LARGE EXTRA DIMENSIONS

2006 ◽  
Vol 21 (15) ◽  
pp. 3095-3109 ◽  
Author(s):  
SATOSHI MATSUDA ◽  
SHIGENORI SEKI
Keyword(s):  
Cosmological Constant ◽  
Extra Dimensions ◽  
Vacuum Energy ◽  
Large Extra Dimensions ◽  
Casimir Energy ◽  
Wilkinson Microwave Anisotropy Probe ◽  
Extra Space ◽  
Kaluza Klein

We consider a compactification of extra dimensions and numerically calculate Casimir energy which is provided by the mass of Kaluza–Klein modes. For the extra space we consider a torus with shape moduli and show that the corresponding vacuum energy is represented as a function of the moduli parameter of the extra dimensions. By assuming that the Casimir energy may be identified with cosmological constant, we evaluate the size of extra dimensions in terms of the recent data given by the Wilkinson Microwave Anisotropy Probe (WMAP) measurement and the supernovae observations. We suggest that the observed cosmological constant may probe the shape moduli of the extra space by the study of the Casimir energy of the compactified extra dimensions.

scholarly journals Kaluza-Klein states from large extra dimensions

1999 ◽  
Vol 59 (10) ◽  
Author(s):  
Tao Han ◽  
Joseph D. Lykken ◽  
Ren-Jie Zhang
Keyword(s):  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
Kaluza Klein

scholarly journals A PROBLEM IN VIRTUAL GRAVITON EXCHANGES IN FLAT LARGE EXTRA DIMENSIONS

2010 ◽  
Vol 25 (23) ◽  
pp. 4511-4523
Author(s):  
HARUKA NAMATAME
Keyword(s):  
Cross Sections ◽  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
High Energy ◽  
Momentum Conservation ◽  
More Care ◽  
High Energy Collider ◽  
The Cross ◽  
Shell Production ◽  
Kaluza Klein

It is pointed out in a class of models with large extra dimensions that the cross-section of processes with virtual Kaluza–Klein graviton exchanges becomes either much smaller or much larger by many orders of magnitude than what is expected from that of the on-shell production of the Kaluza–Klein gravitons. We demonstrate how the problem arises using a toy model. The cause of this new problem lies in the fact that we do not have momentum conservation in the extra dimensions. To search for the signal of the large extra dimensions with high energy collider experiments, we need more care in interpreting the earlier results on the cross-sections of these processes.

SEARCHES FOR EXTRA DIMENSIONS AND Z′ BOSONS AT DØ

2005 ◽  
Vol 20 (15) ◽  
pp. 3277-3283 ◽  
Author(s):  
◽  
RYAN J. HOOPER
Keyword(s):  
Z Boson ◽  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
Z Bosons ◽  
Planck Scale ◽  
Final States ◽  
Mass Limit ◽  
Theoretical Frameworks ◽  
Final State ◽  
Dielectron Channel

We present results on the searches for Extra Dimensions and Z′ Bosons conducted at the Tevatron's DØ Detector using dielectron, diphoton, and dimuon final states. The theoretical frameworks of Large Extra Dimensions (LED), Randall-Sundrum Extra Dimensions (RS), TeV-1 Extra Dimensions, and Z′ bosons are explored in the dielectron and diphoton channels, while LED and Z′ bosons are also searched for in the dimuon final state. In the absence of signals we find lower 95% confidence level (CL) limits on the mass of a SM-like Z′ boson of 780 GeV and 680 GeV in the dielectron and dimuon channels, respectively. Furthermore, we find a lower 95% CL limit of 1.12 TeV on the TeV-1 compactification scale ( M C) in the dielectron channel. In the diEM channel and LED framework we set a lower 95% CL limit of 1.43 TeV (GRW) on the fundamental Planck scale ( M S). Using a dimuon final state we find a lower 95% CL limit of 1.1 TeV (GRW) on M S. We also find a lower 95% CL mass limit of 785 GeV on a RS graviton decaying into a dielectron or diphoton final state.

scholarly journals Cosmic cloaking of rich extra dimensions

2021 ◽  
Author(s):  
Aghil Alaee ◽  
Marcus Khuri ◽  
Hari Kunduri
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
Dimensional Theory ◽  
Hoop Conjecture ◽  
Significant Size ◽  
The Universe ◽  
Lower Dimensional ◽  
Kaluza Klein

We present arguments that show why it is difficult to see rich extra dimensions in the universe. Conditions are found where significant size and variation of the extra dimensions in a Kaluza–Klein compactification lead to a black hole in the lower-dimensional theory. The idea is based on the hoop conjecture concerning black hole existence, as well as on the observation that dimensional reduction on macroscopically large, twisted, or highly dynamical extra dimensions contributes positively to the energy density in the lower-dimensional theory and can induce gravitational collapse. A threshold for the size is postulated on the order of [Formula: see text][Formula: see text]m, whereby extra dimensions of length above this level must lie inside black holes, thus cloaking them from the view of outside observers. The threshold depends on the size of the universe, leading to speculation that in the early stages of evolution truly macroscopic and large extra dimensions would have been visible.

scholarly journals Large extra dimensions and decaying Kaluza-Klein recurrences

2003 ◽  
Vol 68 (11) ◽  
Author(s):  
R. N. Mohapatra ◽  
S. Nussinov ◽  
A. Pérez-Lorenzana
Keyword(s):  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
Kaluza Klein

scholarly journals Monopole in the Dilatonic Gauge Field Theory

2000 ◽  
Vol 53 (5) ◽  
pp. 653
Author(s):  
D. Karczewska ◽  
R. Manka
Keyword(s):  
Field Theory ◽  
Gauge Field ◽  
Extra Dimensions ◽  
Numerical Study ◽  
Large Extra Dimensions ◽  
Gauge Field Theory ◽  
Spherically Symmetric ◽  
Dilaton Field ◽  
Klein Theory ◽  
Kaluza Klein

A numerical study of static, spherically symmetric monopole solutions coupled to the dilaton field, inspired by the Kaluza–Klein theory with large extra dimensions is presented. The generalised Prasad?Sommerfield solution is obtained. We show that the monopole may also have the dilaton cloud configurations.

BOUNDS ON THE COUPLING CONSTANTS OF THE MAJORON TO TWO NEUTRINOS IN EXTRA DIMENSIONS FROM Z → νν(J) DECAY

2005 ◽  
Vol 20 (27) ◽  
pp. 6247-6257
Author(s):  
SHERIF MOUSSA ◽  
SALAH NASRI ◽  
FRANCESCO SANNINO ◽  
JOSEPH SCHECHTER
Keyword(s):  
Z Boson ◽  
Extra Dimensions ◽  
Higher Dimensions ◽  
Upper Bounds ◽  
Partial Width ◽  
Coupling Constants ◽  
Expected Increase ◽  
Kaluza Klein ◽  
The Invisible

We give an overview for the bounds of Majoron-neutrino coupling constants from supernova and accelerators. Using the accurate known value for the invisible partial width for Z boson we obtained constraints on the coupling of the Majoron to two neutrinos, for singlet Majoron model, in case of 3+1 dimensions as well as in extra dimensions, where we assumed the singlet Majoron can propagate in higher dimensions. We found that the predicted coupling constants are far below these upper bounds if a natural see-saw is adopted. Also, the expected increase in Z partial width due to many Kaluza-Klein excitations has been suppressed due to the decrease of the coupling constants.

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