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.

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 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.

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.

scholarly journals A CRITICAL LOOK AT PRECISION ELECTROWEAK DATA AT HIGH ENERGY—A HINT FOR PHYSICS BEYOND THE STANDARD MODEL?

1994 ◽  
Vol 09 (35) ◽  
pp. 3301-3312
Author(s):  
A. GURTU
Keyword(s):  
Standard Model ◽  
Pair Production ◽  
High Energy ◽  
Recent Measurement ◽  
Beyond The Standard Model ◽  
Full Data ◽  
Text Production ◽  
Basic Framework ◽  
The Standard Model ◽  
Precision Electroweak Data

High energy electroweak data, including the recent measurement of M top is analyzed within the basic framework of the standard model. While the experimentally measured value of [Formula: see text] implies a low value of M top , the rest of the data demands a much higher value. Estimates of M Higgs within the SM framework including and excluding this Rb measurement are given. Next this discrepancy is expressed in terms of a new parameter, [Formula: see text], the excess[Formula: see text] production compared to that expected from a SM fit. This parameter is determined to be (9.4 to 12.8) ± 5.0 MeV, implying an excess of over 10 000 [Formula: see text] events in each LEP experiment after the 1993 data is fully analyzed. The origin of these events could be non-minimal Higgs pair production which should be thoroughly searched for in the full data sample of ~2×106 events per LEP experiment. Unless this discrepancy eventually turns out to be a fluctuation one may be witnessing at LEP the advent of physics beyond the standard model.

scholarly journals TESTING VECTOR BOSON DOMINANCE OF ELECTROWEAK INTERACTIONS VIA e+e− ANNIHILATION INTO BOSON PAIRS

1996 ◽  
Vol 11 (13) ◽  
pp. 2293-2307
Author(s):  
V.V. KABACHENKO ◽  
YU. F. PIROGOV
Keyword(s):  
Pair Production ◽  
Linear Collider ◽  
Vector Boson ◽  
Higgs Bosons ◽  
Electroweak Interactions ◽  
Boson Pair ◽  
Polarized Beams ◽  
Boson Pair Production ◽  
Compositeness Scale

In the framework of the unified compositeness of leptons, quarks and Higgs bosons, supplemented with the hypothesis of the vector boson dominance of the SM gauge interactions, restrictions on the universal residual fermion–boson and boson–boson interactionsare investigated. Manifestations of the universal interactions in the W+W− and ZH boson pair production at the 2 TeV e+e− linear collider are studied. Definite signaturesof these interactions are exposed, and their relations to the nonstandard triple gaugeinteractions are considered. It is shown that the unified substructure could be tested atthe collider in these processes up to the compositeness scale [Formula: see text], which liesin the naturally preferred deca-TeV region. Importance of the optimal angular cutoffsand the polarized beams is found.

Tests of the standard model with lepton pair production ine + e ? reactions

1985 ◽  
Vol 27 (3) ◽  
pp. 341-349 ◽  
Author(s):  
◽  
Ch. Berger ◽  
A. Deuter ◽  
H. Genzel ◽  
W. Lackas ◽  
...  
Keyword(s):  
Standard Model ◽  
Pair Production ◽  
Lepton Pair ◽  
Lepton Pair Production ◽  
The Standard Model
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