scholarly journals Electroweak precision measurements and collider probes of the standard model with large extra dimensions

1999 ◽  
Vol 61 (1) ◽  
Author(s):  
Thomas G. Rizzo ◽  
James D. Wells
Keyword(s):  
Standard Model ◽  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
Precision Measurements ◽  
The Standard Model ◽  
Electroweak Precision

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 A FB in the SMEFT: precision Z physics at the LHC

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
Víctor Bresó-Pla ◽  
Adam Falkowski ◽  
Martín González-Alonso
Keyword(s):  
Field Theory ◽  
Standard Model ◽  
Effective Field Theory ◽  
New Physics ◽  
Effective Field ◽  
Precision Measurements ◽  
Vertex Corrections ◽  
The Standard Model ◽  
Electroweak Precision

Abstract We study the forward-backward asymmetry AFB in pp → ℓ+ℓ− at the Z peak within the Standard Model Effective Field Theory (SMEFT). We find that this observable provides per mille level constraints on the vertex corrections of the Z boson to quarks, which close a flat direction in the electroweak precision SMEFT fit. Moreover, we show that current AFB data is precise enough so that its inclusion in the fit improves significantly LEP bounds even in simple New Physics setups. This demonstrates that the LHC can compete with and complement LEP when it comes to precision measurements of the Z boson properties.

scholarly journals Drell–Yan constraints on new electroweak states: LHC as a pp → ℓ+ℓ− precision machine

2017 ◽  
Vol 32 (16) ◽  
pp. 1750094 ◽  
Author(s):  
Christian Gross ◽  
Oleg Lebedev ◽  
Jose Miguel No
Keyword(s):  
Standard Model ◽  
Initial Data ◽  
Invariant Mass ◽  
Invariant Mass Distribution ◽  
Precision Measurements ◽  
Dilepton Invariant Mass ◽  
High Energies ◽  
The Standard Model ◽  
New States ◽  
Electroweak Precision

The Standard Model (SM) extensions with vector-like states which have either zero hypercharge or zero weak isospin are rather poorly constrained by the electroweak precision measurements. Such new states would however modify the running of the gauge couplings at high energies. As a result, the Drell–Yan process [Formula: see text] at the LHC places useful constraints on these models. The relevant observables include both the dilepton invariant mass distribution [Formula: see text] and the forward–backward asymmetry [Formula: see text]. We find that the LHC Run 1 data and the initial data from Run 2 surpass the sensitivity of LEP and already put meaningful constraints on the existence of such particles, which will become progressively stronger with more data.

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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