Search for Large Extra Dimensions Using the DØ detector

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 860-862
Author(s):  
◽  
Amber Boehnlein
Keyword(s):  
Standard Model ◽  
Invariant Mass ◽  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
Complete Agreement ◽  
Electron Pairs ◽  
Mass Distributions ◽  
The Standard Model ◽  
Lower Limits ◽  
Kaluza Klein

We have searched for the effects of Kaluza Klein gravitons predicted in theories of large spatial extra dimensions (LED). Analyzing angular and invariant mass distributions of photon and electron pairs in 127 pb -1 of data, we find complete agreement with expectations from the Standard Model. There were no anomalous events found that are characteristic of virtual graviton exchange. We set lower limits on the compactification scale of large extra dimensions between 1.0 and 1.4 TeV for the number of extra dimensions between 2 and 7.

scholarly journals Physics Beyond The Standard Model: Experimental

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 92-103 ◽  
Author(s):  
R. L. Culbertson
Keyword(s):  
Standard Model ◽  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
High Energy ◽  
Higgs Bosons ◽  
Beyond The Standard Model ◽  
The Standard Model ◽  
Model Independent

The search for physics beyond the Standard Model includes Technicolor particles, Higgs Bosons, compositeness, many variations of Supersymmetry, large extra dimensions, model-independent searches for anomalies, and other topics. This article reports a subset of these ongoing searches at the high-energy colliders, Tevatron, HERA and LEP.

FROM EXTRA-DIMENSIONS: MULTIPLE BRANE SCENARIOS AND THEIR CONTENDERS

2010 ◽  
Vol 25 (32) ◽  
pp. 5817-5845
Author(s):  
IGNATIOS ANTONIADIS
Keyword(s):  
Standard Model ◽  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
Particle Accelerators ◽  
Mass Hierarchy ◽  
Beyond The Standard Model ◽  
Microgravity Experiments ◽  
The Standard Model

We first discuss the problem of mass hierarchy and review briefly the main Beyond the Standard Model (BSM) proposals. We then describe the framework of strings, branes and large extra dimensions and give the main experimental predictions in both particle accelerators and microgravity experiments testing gravity at short distances. Finally, we present some models based on intersecting branes and discuss the issue of Standard Model embedding.

scholarly journals Possible effects of the large extra dimensions on ZZW production at the LHC

2014 ◽  
Vol 29 (31) ◽  
pp. 1450153 ◽  
Author(s):  
Chong Chen ◽  
Lei Guo ◽  
Wen-Gan Ma ◽  
Ren-You Zhang ◽  
Xiao-Zhou Li ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Extra Dimensions ◽  
Selection Criteria ◽  
Large Extra Dimensions ◽  
Hadron Collider ◽  
Leading Order ◽  
Event Selection ◽  
The Standard Model ◽  
Kaluza Klein

We investigate the possible large extra dimensions (LED) effects induced by the Kaluza–Klein (KK) gravitons up to the QCD next-to-leading order (NLO) on ZZW production at the large hadron collider (LHC). The integrated cross-sections and some kinematic distributions are presented in both the Standard Model (SM) and the LED model. The numerical results demonstrate that the NLO QCD corrections are sizeable and remarkably reduce the leading order (LO) LED effect depending strongly on the phase space. The NLO LED relative discrepancies of the total cross-section could become sizable for the ZZW production, if we apply proper event selection criteria. We find that the LO result overestimates the LED effect and is insufficient to provide a believable theoretical prediction.

scholarly journals Kaluza-Klein FIMP dark matter in warped extra-dimensions

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Nicolás Bernal ◽  
Andrea Donini ◽  
Miguel G. Folgado ◽  
Nuria Rius
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Early Universe ◽  
Extra Dimensions ◽  
The Standard Model ◽  
Massive Particles ◽  
Warped Extra Dimensions ◽  
Relic Abundance ◽  
First Time ◽  
Kaluza Klein

Abstract We study for the first time the case in which Dark Matter (DM) is made of Feebly Interacting Massive Particles (FIMP) interacting just gravitationally with the standard model particles in an extra-dimensional Randall-Sundrum scenario. We assume that both the dark matter and the standard model are localized in the IR-brane and only interact via gravitational mediators, namely the graviton, the Kaluza-Klein gravitons and the radion. We found that in the early Universe DM could be generated via two main processes: the direct freeze-in and the sequential freeze-in. The regions where the observed DM relic abundance is produced are largely compatible with cosmological and collider bounds.

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.

scholarly journals SIGNATURES OF EXTRA DIMENSIONS AT eγ AND γγ COLLIDERS

2000 ◽  
Vol 15 (16) ◽  
pp. 2613-2622
Author(s):  
HOOMAN DAVOUDIASL
Keyword(s):  
Standard Model ◽  
Quantum Gravity ◽  
Cross Sections ◽  
Extra Dimensions ◽  
Linear Collider ◽  
Large Extra Dimensions ◽  
Gravity Theory ◽  
Weak Scale ◽  
Effective Gravity ◽  
The Standard Model

We study the processes γe→γe and γγ→γγ, in the context of the proposal for Weak Scale Quantum Gravity (WSQG) with large extra dimensions. With an ultraviolet cutoff MS~1 TeV for the effective gravity theory, the cross sections obtained for these processes at the Next Linear Collider (NLC), with the eγ an γγ options, deviate from the predictions of the Standard Model significantly. Our results suggest that, for typical proposed NLC energies and luminosities, the predictions of WSQG can be tested in the range 1 TeV≲MS≲10 TeV, making eγ an γγ colliders important tools for probing WSQG.

Single- and Multi-Photon Events with Missing Energy in e+e- Collisions at LEP

2005 ◽  
Vol 20 (15) ◽  
pp. 3273-3276 ◽  
Author(s):  
◽  
MARAT GATAULLIN
Keyword(s):  
Standard Model ◽  
Direct Measurement ◽  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
Light Neutrino ◽  
Beyond The Standard Model ◽  
Missing Energy ◽  
Species Status ◽  
Neutrino Production ◽  
The Standard Model

A brief review of searches for physics beyond the Standard Model using single- and multi-photon events with missing energy at LEP is given here. These include searches for supersymmetry, large extra dimensions, and anomalous neutrino production. Recent results from all four LEP experiments are presented, including improved limits on the new scale of gravity for models with large extra dimensions and the most precise direct measurement of the number of light neutrino species. Status and prospects of the LEP combined searches are also discussed.

scholarly journals EXPERIMENTAL RESULTS ON SEARCHES BEYOND THE STANDARD MODEL

2007 ◽  
Vol 22 (30) ◽  
pp. 5513-5522
Author(s):  
ELISABETTA GALLO
Keyword(s):  
Transverse Momentum ◽  
Standard Model ◽  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
Experimental Results ◽  
Beyond The Standard Model ◽  
Missing Transverse Momentum ◽  
The Standard Model

Recent results for direct searches for physics beyond the Standard Model are reviewed. The results include Tevatron II data up to 1.2 fb-1 and HERA results up to 350 pb-1. Searches for Supersymmetry, for compositeness and for large extra dimensions are presented. The excess of events with an isolated lepton and high missing transverse momentum at HERA is discussed.

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