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.

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 Total cross sections of eγ → $$ eX\overline{X} $$ processes with X = μ, γ, e via multiloop methods

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Roman N. Lee ◽  
Alexey A. Lyubyakin ◽  
Vyacheslav A. Stotsky
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Elliptic Integral ◽  
High Energy ◽  
Calculation Methods ◽  
Complete Elliptic Integral ◽  
Total Cross Sections ◽  
Multiloop Calculation ◽  
The Cross ◽  
Analytical Expressions

Abstract Using modern multiloop calculation methods, we derive the analytical expressions for the total cross sections of the processes e−γ →$$ {e}^{-}X\overline{X} $$ e − X X ¯ with X = μ, γ or e at arbitrary energies. For the first two processes our results are expressed via classical polylogarithms. The cross section of e−γ → e−e−e+ is represented as a one-fold integral of complete elliptic integral K and logarithms. Using our results, we calculate the threshold and high-energy asymptotics and compare them with available results.

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

DIFFRACTION AND VECTOR MESON PRODUCTION

2004 ◽  
Vol 19 (07) ◽  
pp. 1099-1110 ◽  
Author(s):  
Y. YAMAZAKI
Keyword(s):  
Vector Meson ◽  
Energy Dependence ◽  
Cross Sections ◽  
Meson Production ◽  
High Energy ◽  
Vector Meson Production ◽  
Diffractive Process ◽  
The Cross

A review is given of the measurements of the diffractive process in recent years from two high-energy colliders, the HERA ep collider and the Tevatron [Formula: see text] collider. The energy dependence of the cross sections and the factorisation properties of diffractive processes are discussed.

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 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.

ANALYTIC EXPRESSIONS OF CROSS SECTIONS, ASYMMETRIES AND W DENSITY MATRICES FOR e+e− → W+W− WITH GENERAL THREE-BOSON COUPLINGS

1993 ◽  
Vol 08 (19) ◽  
pp. 3285-3320 ◽  
Author(s):  
G. GOUNARIS ◽  
J. LAYSSAC ◽  
G. MOULTAKA ◽  
F. M. RENARD
Keyword(s):  
Cross Sections ◽  
High Energy ◽  
Spin Density Matrix ◽  
Matrix Elements ◽  
Density Matrices ◽  
Independent Analysis ◽  
Analytic Expressions ◽  
Complete Set ◽  
Model Independent ◽  
High Energy Collider

We establish explicit analytic expressions for the e+e− → W+W− cross sections, asymmetries and W± spin density matrix elements in terms of the complete set of anomalous three-boson couplings. This should be useful for performing a model-independent analysis of LEP 2 or future high energy collider data. Sensitivities to the various three-boson couplings are discussed and possible ways to disentangle their effects are proposed.

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