scholarly journals IDENTIFYING THE CONTRIBUTIONS OF UNIVERSAL EXTRA DIMENSIONS IN THE HIGGS SECTOR AT LINEAR e+e- COLLIDERS

2008 ◽  
Vol 23 (03n04) ◽  
pp. 519-528 ◽  
Author(s):  
ANINDYA DATTA ◽  
SANTOSH KUMAR RAI
Keyword(s):  
Cross Sections ◽  
Higgs Sector ◽  
Final States ◽  
Universal Extra Dimension ◽  
Simple Analysis ◽  
Decay Properties ◽  
The Standard Model ◽  
Simple Ratio ◽  
Kaluza Klein ◽  
Production Channel

We study the dilepton–dijet signal in the dominant Higgs production channel at a linear e+e- collider. We estimate the effects of universal extra dimension (UED) by a simple analysis of the cross-sections. The heavy Kaluza–Klein excitations of the Standard Model fields in UED can significantly alter the decay properties of the Higgs boson to loop-driven final states. We show that by taking a simple ratio between cross-sections of two different final states this difference can be very easily highlighted.

scholarly journals Quark-flavor-changing Higgs decays from a universal extra dimension

2020 ◽  
Vol 35 (24) ◽  
pp. 2050141
Author(s):  
Carlos M. Farrera ◽  
Alejandro Granados-González ◽  
Héctor Novales-Sánchez ◽  
J. Jesús Toscano
Keyword(s):  
Standard Model ◽  
Extra Dimension ◽  
New Physics ◽  
Tree Level ◽  
Universal Extra Dimension ◽  
Loop Level ◽  
Flavor Changing ◽  
The Standard Model ◽  
The One ◽  
Kaluza Klein

Kaluza–Klein fields characterizing, from a four-dimensional viewpoint, the presence of compact universal extra dimensions would alter low-energy observables through effects determined by some compactification scale, [Formula: see text], since the one-loop level, thus being particularly relevant for physical phenomena forbidden at tree level by the Standard Model. This paper explores, for the case of one universal extra dimension, such new-physics contributions to Higgs decays [Formula: see text], into pairs of quarks with different flavors, a sort of decay process which, in the Standard Model, strictly occurs at the loop level. Finite results, decoupling as [Formula: see text], are calculated. Approximate short expressions, valid for large compactification scales, are provided. We estimate that Kaluza–Klein contributions lie below predictions from the Standard Model, being about 2 to 3 orders of magnitude smaller for compactification scales within [Formula: see text].

scholarly journals BOUND-STATE/ELEMENTARY-PARTICLE DUALITY IN THE HIGGS SECTOR AND THE CASE FOR AN EXCITED "HIGGS" WITHIN THE STANDARD MODEL

2013 ◽  
Vol 28 (28) ◽  
pp. 1350103 ◽  
Author(s):  
AXEL MAAS
Keyword(s):  
Elementary Particle ◽  
Standard Model ◽  
Cross Sections ◽  
Bound States ◽  
Weak Interactions ◽  
Higgs Sector ◽  
Bound State ◽  
Leading Order ◽  
Expectation Value ◽  
The Standard Model

Though being weakly interacting, QED can support bound states. In principle, this can be expected for the weak interactions in the Higgs sector as well. In fact, it has been argued long ago that there should be a duality between bound states and the elementary particles in this sector, at least in leading order in an expansion in the Higgs quantum fluctuations around its expectation value. Whether this remains true beyond the leading order is being investigated using lattice simulations, and support is found. This provides a natural interpretation of peaks in cross-sections as bound states. This would imply that (possibly very broad) resonances of Higgs and W and Z bound states could exist within the Standard Model.

scholarly journals Searches for Massive Graviton Resonances at the LHC

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
T. V. Obikhod ◽  
I. A. Petrenko
Keyword(s):  
Mass Spectrum ◽  
Cross Sections ◽  
Extra Dimensions ◽  
Production Cross ◽  
Branching Fractions ◽  
Graviton Mass ◽  
Massive Graviton ◽  
Production Processes ◽  
The Standard Model ◽  
Kaluza Klein

The Standard Model problems lead to the new theories of extra dimensions: Randall-Sundrum model, Arkani-Hamed-Dimopoulos-Dvali model, and TeV-1 model. In the framework of these models, with the help of computer program Pythia8.2, the production cross sections for Kaluza-Klein particles at various energies at the LHC were calculated. The generation of monojet events from scalar graviton emission was considered for number of extra dimensions (n=2, 4, and 6) for the energy at the LHC 14 TeV. The graviton production processes through the gluon-gluon, quark-gluon, and quark-quark fusion processes are also studied and some periodicity was found in the behavior of the graviton mass spectrum. Production cross sections multiplied by branching fractions were calculated for the massive graviton, G, within Randall-Sundrum scenario and the most probable processes of graviton decay at 13 TeV, 14 TeV, and 100 TeV were counted.

scholarly journals CONSTRAINTS ON UED KK-NEUTRINO DARK MATTER FROM MAGNETIC DIPOLE MOMENTS

2007 ◽  
Vol 16 (10) ◽  
pp. 1593-1600
Author(s):  
THOMAS FLACKE ◽  
DAVID W. MAYBURY
Keyword(s):  
Dark Matter ◽  
Magnetic Dipole ◽  
Extra Dimension ◽  
Dipole Moments ◽  
Dark Matter Candidate ◽  
Universal Extra Dimension ◽  
The Standard Model ◽  
Five Dimension ◽  
The Stability ◽  
Kaluza Klein

Generically, universal extra dimension (UED) extensions of the standard model predict the stability of the lightest Kaluza–Klein (KK) particle and hence provide a dark matter candidate. For UED scenarios with one extra dimension, we model-independently determine the size of the induced five-dimension magnetic dipole moment of the KK-neutrino, ν(1). We show that current observational bounds on the interactions of dipole dark matter place constraints on UED models with KK-neutrino dark matter.

scholarly journals THE HIGGS SECTOR ON A TWO-SHEETED SPACE–TIME

2006 ◽  
Vol 21 (22) ◽  
pp. 4519-4541 ◽  
Author(s):  
COSMIN MACESANU ◽  
KAMESHWAR C. WALI
Keyword(s):  
Standard Model ◽  
Higgs Sector ◽  
Space Time ◽  
Symmetric Model ◽  
The Standard Model ◽  
Klein Theory ◽  
Left And Right ◽  
Higgs Fields ◽  
General Gauge ◽  
Kaluza Klein

We present a general formalism based on the framework of noncommutative geometry, suitable to the study of the standard model of electroweak interactions, as well as that of more general gauge theories. Left- and right-handed chiral fields are assigned to two different sheets of space–time (a discretized version of Kaluza–Klein theory). Scalar Higgs fields find themselves treated on the same footing as the gauge fields, resulting in spontaneous symmetry breaking in a natural and predictable way. As a first test, we apply the formalism to the Standard Model, where one can predict the Higgs mass and the top Yukawa coupling. The results obtained for this case are similar with results obtained in alternate formulations. We then study the left–right symmetric model, where we show that this framework imposes interesting constraints on the type and coefficients of terms appearing in the Higgs potential.

scholarly journals THEORETICAL ASPECTS OF STANDARD-MODEL HIGGS–BOSON PHYSICS AT A FUTURE e+e-LINEAR COLLIDER

2002 ◽  
Vol 17 (11) ◽  
pp. 1457-1476 ◽  
Author(s):  
BERND A. KNIEHL
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Particle Physics ◽  
Linear Collider ◽  
Final States ◽  
Elementary Particle Physics ◽  
Decay Properties ◽  
Quantum Numbers ◽  
The Standard Model ◽  
Production Mechanisms

The Higgs boson is the missing link of the Standard Model of elementary particle physics. We review its decay properties and production mechanisms at a future e+e-linear collider and its e-e-, e±γ, and γγ modes, with special emphasis on the influence of quantum corrections. We also discuss how its quantum numbers and couplings can be extracted from the study of appropriate final states.

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 Searching for heavy Higgs in supersymmetric final states at the LHC

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Amit Adhikary ◽  
Biplob Bhattacherjee ◽  
Rohini M. Godbole ◽  
Najimuddin Khan ◽  
Suchita Kulkarni
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Supersymmetric Standard Model ◽  
Higgs Sector ◽  
Search Strategies ◽  
Final States ◽  
High Luminosity ◽  
The Standard Model ◽  
Extended Higgs Sector ◽  
Flavour Physics

Abstract In this work, we analyse and demonstrate possible strategies to explore extended Higgs sector of the Minimal Supersymmetric Standard Model (MSSM). In particular we concentrate on heavy Higgs decays to electroweakinos. We analyse the Higgs to electroweakino decays in the allowed MSSM parameter space after taking into account 13 TeV LHC searches for supersymmetric particles and phenomenological constraints such as flavour physics, Higgs measurements and dark matter constraints. We explore some novel aspects of these Higgs decays. The final states resulting from Higgs to electroweakino decays will have backgrounds arising from the Standard Model as well as direct electroweakino production at the LHC. We demonstrate explicit kinematical differences between Higgs to electroweakino decays and associated backgrounds. Furthermore, we demonstrate for a few specific example points, optimised analysis search strategies at the high luminosity LHC (HL-LHC) run. Finally, we comment on possible search strategies for heavy Higgs decays to exotic final states, where the lightest chargino is long lived and leads to a disappearing track at the LHC.

KALUZA–KLEIN MODE CORRECTIONS TO $\bar{B}\rightarrow X_s\gamma$ IN ACD MODEL

2012 ◽  
Vol 27 (05) ◽  
pp. 1250011 ◽  
Author(s):  
TIE-JUN GAO ◽  
TAI-FU FENG ◽  
JIAN-BIN CHEN
Keyword(s):  
Numerical Analysis ◽  
Standard Model ◽  
Extra Dimension ◽  
Branching Ratio ◽  
Universal Extra Dimension ◽  
The Standard Model ◽  
Acd Model ◽  
Kaluza Klein

We discuss the corrections from the Kaluza–Klein (KK) modes to the branching ratio of the rare process [Formula: see text] in extension of the standard model with a universal extra dimension, which was proposed by Appelquist, Cheng and Dobrescu (ACD). Assuming 1/R≫mW, we sum over the series composed by the KK towers, and get the decoupling result in the limit 1/R→∞. The numerical analysis indicates that the corrections from the KK-excitations to the branching ratio of [Formula: see text] is about 3.5% as 1/R = 400 GeV .

scholarly journals New results on low energy exclusive hadronic final states from BABAR

2018 ◽  
Vol 172 ◽  
pp. 04002
Author(s):  
J. William Gary
Keyword(s):  
Standard Deviation ◽  
Cross Section ◽  
Cross Sections ◽  
Particle Physics ◽  
Low Energy ◽  
Final States ◽  
Muon Anomalous Magnetic Moment ◽  
The Standard Model ◽  
Babar Experiment ◽  
Hadronic Final States

The 3.6 standard deviation discrepancy between the standard model (SM) prediction for the muon anomalous magnetic moment gμ - 2 and the corresponding experimental measurement is one of the most persistent and intriguing potential signals in particle physics for physics beyond the SM. The largest uncertainty in the SM prediction for gμ - 2 arises from the uncertainty in the measured low energy inclusive e+e- → hadrons cross section. New results from the BABAR experiment at SLAC for the e+e- → π+ π- π0 π0 and e+e- → KK ππ cross sections are presented that significantly reduce this uncertainty. New BABAR results for other low energy exclusive hadronic processes are also discussed.

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