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 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 SIGNATURES OF SINGLET NEUTRINOS IN LARGE EXTRA DIMENSIONS AT THE LHC

2009 ◽  
Vol 24 (28n29) ◽  
pp. 5173-5215 ◽  
Author(s):  
DOUGLAS M. GINGRICH
Keyword(s):  
Higgs Boson ◽  
Large Hadron Collider ◽  
Detailed Analysis ◽  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
Hadron Collider ◽  
Planck Scale ◽  
Neutrino Masses ◽  
The Status ◽  
Dimensional Models

It is a challenge to explain why neutrinos are so light compared to other leptons. Small neutrino masses can be explained if right-handed fermions propagate in large extra dimensions. Fermions propagating in the bulk would have implications on Higgs boson decays. If the Higgs boson is discovered at the Large Hadron Collider (LHC), a detailed analysis may reveal the presence of large extra dimensions. This paper reviews the status of large extra-dimensional models in the context of the current limits on Higgs boson masses and the fundamental Planck scale in extra dimensions.

scholarly journals Bounds on large extra dimensions from the Generalized Uncertainty Principle

2017 ◽  
Vol 32 (15) ◽  
pp. 1750082
Author(s):  
Marco Cavaglià ◽  
Benjamin Harms ◽  
Shaoqi Hou
Keyword(s):  
Black Hole ◽  
Lower Bounds ◽  
Uncertainty Principle ◽  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
Production Cross ◽  
Generalized Uncertainty Principle ◽  
Planck Scale ◽  
Minimum Length ◽  
Minimum Length Scale

The Generalized Uncertainty Principle (GUP) implies the existence of a physical minimum length scale [Formula: see text]. In this scenario, black holes must have a radius larger than [Formula: see text]. They are hotter and evaporate faster than in standard Hawking thermodynamics. We study the effects of the GUP on black hole production and decay at the LHC in models with large extra dimensions. Lower bounds on the fundamental Planck scale and the minimum black hole mass at formation are determined from black hole production cross-section limits by the CMS Collaboration. The existence of a minimum length generally decreases the lower bounds on the fundamental Planck scale obtained in the absence of a minimum length.

scholarly journals Search for Large Extra Dimensions via Single Photon plus Missing Energy Final States ats=1.96  TeV

2008 ◽  
Vol 101 (1) ◽  
Author(s):  
V. M. Abazov ◽  
B. Abbott ◽  
M. Abolins ◽  
B. S. Acharya ◽  
M. Adams ◽  
...  
Keyword(s):  
Extra Dimensions ◽  
Single Photon ◽  
Large Extra Dimensions ◽  
Final States ◽  
Missing Energy

scholarly journals OBSERVABLES FROM LARGE EXTRA DIMENSIONS

2004 ◽  
Vol 13 (07) ◽  
pp. 1453-1460
Author(s):  
SABINE HOSSENFELDER ◽  
MARCUS BLEICHER ◽  
HORST STÖCKER
Keyword(s):  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
Planck Scale ◽  
Minimal Length ◽  
Length Scale ◽  
Beyond The Standard Model ◽  
Planck Length ◽  
The Standard Model ◽  
Minimal Length Scale ◽  
Effective Theories

The existence of extra dimensions and a minimal length scale are modifications of our spacetime which are suggested by string theory. In models with additional dimensions, the Planck scale can be lowered to values accessible by future colliders and in ultra high energetic cosmic rays. Effective theories which extend beyond the standard-model by including extra dimensions and a minimal length allow the computation of observables and can be used to make testable predictions. Expected effects that arise within these models are the production of gravitons and black holes. Furthermore, the Planck length is a lower bound to the possible resolution of spacetime which might be reached soon.

MONOJET EVENTS: FROM DARK MATTER TO EXTRA DIMENSIONS, A SEARCH FOR THE EXOTICS USING THE STANDARD MODEL

2013 ◽  
Vol 28 (08) ◽  
pp. 1330012
Author(s):  
PIERRE-HUGUES BEAUCHEMIN ◽  
REYHANEH REZVANI
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Extra Dimensions ◽  
Transverse Energy ◽  
Large Extra Dimensions ◽  
High Energy ◽  
New Physics ◽  
High Transverse Momentum ◽  
Final State ◽  
The Standard Model

Monojet events consist in event topologies with a high transverse momentum jet and a large amount of missing transverse energy. They constitute a promising final state that could lead to phenomena beyond the Standard Model. The theoretical models giving rise to such a signature include the pair production of Weakly Interacting Massive Particles, as dark matter candidates, and models of large extra dimensions. Monojet events can even be used to measure the Standard Model properties of Z boson decays, provided that the precision of the analysis is high enough. Such precision can be achieved by using data-driven determinations of the Standard Model contributions to monojet events. Exotics searches for new physics in such a final state have been performed at all high energy hadronic collider experiments since SPS. The ATLAS and CMS analyses with 7 TeV LHC data provide the latest and most useful information obtained from monojet studies. Their results are presented and discussed in this review paper.

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