scholarly journals PAIR PRODUCTION OF TAU SNEUTRINOS AT LINEAR COLLIDERS

2011 ◽  
Vol 26 (24) ◽  
pp. 1783-1796
Author(s):  
V. ARI ◽  
O. ÇAKIR
Keyword(s):  
Standard Model ◽  
Pair Production ◽  
Parameter Space ◽  
Linear Collider ◽  
Beam Polarization ◽  
Supersymmetric Extension ◽  
The Standard Model ◽  
Linear Colliders ◽  
Integrated Luminosity

The pair production of tau sneutrinos in e+e- collisions and their subsequent decays are studied in a framework of the supersymmetric extension of the standard model. We present an analysis for the parameter space (branching versus mass) with the beam polarization capability. The tau sneutrino can be observed up to a mass of 1 TeV if the branching is around 0.35 at the linear collider with [Formula: see text] and integrated luminosity of 1 ab-1.

Probing space–time noncommutativity in the top quark pair production at e+e- collider

2014 ◽  
Vol 29 (27) ◽  
pp. 1450156 ◽  
Author(s):  
Ravi S. Manohar ◽  
J. Selvaganapathy ◽  
Prasanta Kumar Das
Keyword(s):  
Standard Model ◽  
Pair Production ◽  
Top Quark ◽  
Linear Collider ◽  
Standard Model Prediction ◽  
Orientation Angle ◽  
Laboratory Frame ◽  
The Standard Model ◽  
Rapidity Distributions ◽  
Azimuthal Asymmetries

The forward–backward asymmetry observed in the top quark pair production at the Fermilab Tevatron points toward the existence of beyond the standard model physics. We have studied the top quark pair production [Formula: see text] in the TeV energy electron–positron linear collider to the leading order of the noncommutative parameter Θμν in the noncommutative standard model. We have made a detailed laboratory frame analysis of the time-averaged cross-section, polar, azimuthal angular distributions, transverse momentum and rapidity distributions, polar (forward–backward) and azimuthal asymmetries of the top-quark pair production in the presence of earth's rotation. We investigated their dependence on the orientation angle of the noncommutative vector η and the noncommutative scale Λ and found that those deviates from the standard model distributions significantly. The azimuthal distribution which is flat in the standard model deviates largely for η = π/2 and Λ = 700 GeV at the fixed machine energy E com = 1000 GeV . We found that the polar distribution deviates largely from the standard model distribution for η = π/2 and Λ = 500 GeV . The azimuthal asymmetry Aϕ which is zero in the standard model can be as large as 4% for Λ = 500 GeV and η = π/2 at the fixed machine energy E com = 1000 GeV . Assuming that the future TeV linear collider will observe Aϕ = ±0.01 we find Λ≤750(860) GeV corresponding to η = π/2. Similarly, corresponding to polar asymmetry A FBz = 0.5078 (which deviates from the standard model prediction by 1%), we find Λ≤760 GeV at the fixed machine energy E com = 1000 GeV for η = π/2.

scholarly journals Possible bilepton resonances in like-sign pairs

2019 ◽  
Vol 34 (10) ◽  
pp. 1950076 ◽  
Author(s):  
Claudio Corianò ◽  
Paul H. Frampton
Keyword(s):  
Standard Model ◽  
Pair Production ◽  
Model Prediction ◽  
Standard Model Prediction ◽  
Mass Range ◽  
Entire Mass Range ◽  
Large Ratio ◽  
The Standard Model ◽  
Integrated Luminosity

We consider pair production of bileptons Y[Formula: see text]Y[Formula: see text] at the LHC for the presently accumulated integrated luminosity of 150/fb. It is shown that the entire mass range 800 GeV [Formula: see text]M(Y) [Formula: see text] 2000 GeV can be successfully searched. A bilepton resonance will have an exceptionally large ratio of signal to background because the Standard Model prediction is so infinitesimal. A 5[Formula: see text] discovery is quite feasible.

scholarly journals SELECTRON SEARCHES IN e−e− SCATTERING

1996 ◽  
Vol 11 (09) ◽  
pp. 1585-1590 ◽  
Author(s):  
FRANK CUYPERS
Keyword(s):  
Standard Model ◽  
Pair Production ◽  
Linear Collider ◽  
Operating Mode ◽  
Simple Analysis ◽  
Large Sample ◽  
Polarized Beams ◽  
The Standard Model

We review the pair-production and decay of selectrons in e−e− collisions and show how the standard model backgrounds can be virtually eliminated with polarized beams. The exceedingly simple analysis involved and the large sample of background-free supersymmetric events make this linear collider operating mode ideal for discovering selectrons and measuring the mass of the lightest neutralino.

scholarly journals Pair production of new heavy leptons with U(1)′ charge at linear colliders

2014 ◽  
Vol 29 (11n12) ◽  
pp. 1450055 ◽  
Author(s):  
V. Arı ◽  
O. Çakır ◽  
S. Kuday
Keyword(s):  
Standard Model ◽  
Pair Production ◽  
Cross Sections ◽  
Production Cross ◽  
Center Of Mass ◽  
Mass Range ◽  
Mixing Parameter ◽  
The Standard Model ◽  
Linear Colliders ◽  
Heavy Leptons

We study the pair production of new heavy leptons within a new U(1)′ symmetry extension of the Standard Model. Because of the new symmetry, the production and decay modes of the new heavy leptons would be different from those of three families of the standard model. The pair production cross-sections depending on the mixing parameter and the mass of heavy leptons have been calculated for the center-of-mass energies of 0.5 TeV, 1 TeV and 3 TeV. The accessible ranges of the parameters have been obtained for different luminosity projections at linear colliders. The search can be performed within the range of mixing parameter -1<x<-0.35 and 0.05<x<1, given that the heavy lepton mass Ml′ = 400 GeV at [Formula: see text] and L int = 100 fb -1. We find the sensitivity to the range of mixing parameter -1<x<1 for the mass range Ml′<800 GeV at [Formula: see text] and L int = 100 fb -1.

scholarly journals The influence of the scalar unparticle on the W-pair production at ILC in the Randall–Sundrum model

2020 ◽  
Vol 35 (25) ◽  
pp. 2050217
Author(s):  
Dang Van Soa ◽  
Bui Thi Ha Giang
Keyword(s):  
Standard Model ◽  
Pair Production ◽  
Cross Sections ◽  
Production Cross ◽  
The Standard Model ◽  
Linear Colliders ◽  
The Cross ◽  
Scaling Dimension

An attempt is made to present the contribution of the scalar unparticle on some scattering processes in the Randall–Sundrum (RS) model. We have evaluated the contribution of the scalar unparticle on the W-pair production cross-sections at International Linear Colliders (ILC). The results indicate that at the low values of the scaling dimension and the bounds on scale [Formula: see text] are around few TeV, the cross-sections are much enhanced, which is quite comparable with the W-production in the Standard Model and hence it is worthwhile to explore in future colliders.

scholarly journals 126 GeV HIGGS BOSON PAIR PRODUCTION AT THE LINEAR COLLIDER IN THE NONCOMMUTATIVE SPACE–TIME

2013 ◽  
Vol 28 (01) ◽  
pp. 1350004 ◽  
Author(s):  
PRASANTA KUMAR DAS ◽  
ABHISHODH PRAKASH
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Pair Production ◽  
Cross Section ◽  
Linear Collider ◽  
Noncommutative Space ◽  
Tree Level ◽  
Boson Pair ◽  
Boson Pair Production ◽  
The Standard Model

We study the 126 GeV Higgs boson pair production through e+e- collision in the noncommutative extension of the standard model using the Seiberg–Witten map of this to the first order of the noncommutative parameter Θμν. The process is forbidden in the standard model at the tree level. We study the time-averaged cross-section of the pair production at TeV scale linear collider and investigate the sensitivity of the cross-section on the orientation angle η and the noncommutative scale Λ. We found that Λ lies in the range 0.5 TeV–1.0 TeV, which can be reached by the upcoming linear collider.

SINGLE PRODUCTION OF THE GAUGE BOSONS VIA eγ COLLISION AT THE HIGH ENERGY e+e- LINEAR COLLIDERS

2012 ◽  
Vol 27 (21) ◽  
pp. 1250119
Author(s):  
CHONG-XING YUE ◽  
JIE-NIAN DAI ◽  
JIAO ZHANG ◽  
JING GUO
Keyword(s):  
Standard Model ◽  
Linear Collider ◽  
High Energy ◽  
New Physics ◽  
Gauge Bosons ◽  
The Standard Model ◽  
Linear Colliders ◽  
The Future ◽  
Single Production

The eγ collider is better suited to study single production of the gauge bosons. In this paper, we first consider the contributions of the three-site Higgsless (3SHL) model and the left–right twin Higgs (LRTH) model to the standard model (SM) processes eγ→eZ and eγ→νeW, and then study single production of the new neutral and charged gauge bosons predicted by these two models via eγ collision in the future high energy e+e- linear collider experiments. We find that the correction effects of 3SHL model on the processes eγ→eZ and eγ→νeW might be detected in the future, while this is not the case for the LRTH model. The process eγ→eZ' can give rise to different signatures in the 3SHL and LRTH models and thus can be used to distinguish these two kinds of new physics models at the high energy e+e- linear colliders.

MEASURING THE CHARGINO MIXING PARAMETERS OF THE MINIMAL SUSY EXTENSION OF THE STANDARD MODEL AT e+e− COLLIDERS IN THE TEV REGION

1989 ◽  
Vol 04 (04) ◽  
pp. 845-855 ◽  
Author(s):  
A. LEIKE
Keyword(s):  
Standard Model ◽  
Pair Production ◽  
Susy Particle ◽  
Supersymmetric Extension ◽  
Mixing Parameters ◽  
The Standard Model ◽  
Polarized Beam ◽  
Minimal Supersymmetric Extension

It is proposed to measure the parameters of the chargino mixing of the minimal supersymmetric extension of the standard model by chargino pair production at e+e− colliders with TeV energies. Some information about the lightest SUSY particle and its mass can be gained. With a polarized beam the minimal SUSY extension of the Standard model could be ruled out.

scholarly journals Flavour Anomalies in a U(1) SUSY Extension of the SM

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 191
Author(s):  
Alexander Bednyakov ◽  
Alfiia Mukhaeva
Keyword(s):  
Standard Model ◽  
Parameter Space ◽  
Gauge Boson ◽  
New Physics ◽  
Low Energy ◽  
Effective Theory ◽  
The Standard Model ◽  
Meson Mixing ◽  
Additional Anomaly ◽  
Lepton Flavour

Flavour anomalies have attracted a lot of attention over recent years as they provide unique hints for possible New Physics. Here, we consider a supersymmetric (SUSY) extension of the Standard Model (SM) with an additional anomaly-free gauge U(1) group. The key feature of our model is the particular choice of non-universal charges to the gauge boson Z′, which not only allows a relaxation of the flavour discrepancies but, contrary to previous studies, can reproduce the SM mixing matrices both in the quark and lepton sectors. We pay special attention to the latter and explicitly enumerate all parameters relevant for our calculation in the low-energy effective theory. We find regions in the parameter space that satisfy experimental constraints on meson mixing and LHC Z′ searches and can alleviate the flavour anomalies. In addition, we also discuss the predictions for lepton-flavour violating decays B+→K+μτ and B+→K+eτ.

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