scholarly journals POLARIZED POSITRONS AT A FUTURE LINEAR COLLIDER AND THE FINAL FOCUS TEST BEAM

2005 ◽  
Vol 20 (31) ◽  
pp. 7423-7432 ◽  
Author(s):  
◽  
ACHIM W. WEIDEMANN
Keyword(s):  
Electron Beam ◽  
Linear Collider ◽  
Test Beam ◽  
Polarized Electrons ◽  
Radiation Length ◽  
Test Electron ◽  
Demonstration Experiment ◽  
Desirable Feature ◽  
Polarized Photons ◽  
Future Linear Collider

Polarized positrons in addition to polarized electrons are a highly desirable feature of future linear e+e-colliders. The motivation for polarized positrons, and a demonstration experiment for the undulator-based production of polarized positrons are reviewed. This experiment ('E-166') uses the 50 GeV Final Focus Test electron beam at SLAC with a 1 m-long helical undulator to make ≈ 10MeV polarized photons. These photons are then converted in a thin (≈ 0.5 radiation length) target into positrons (and electrons) with about 50% polarization.

scholarly journals POLARIMETRY AT A FUTURE LINEAR COLLIDER — HOW PRECISE?

2000 ◽  
Vol 15 (16) ◽  
pp. 2529-2536
Author(s):  
M. WOODS
Keyword(s):  
Electron Beam ◽  
Standard Model ◽  
Linear Collider ◽  
Polarization State ◽  
New Physics ◽  
Polarization Dependence ◽  
Electron Polarization ◽  
Compton Polarimetry ◽  
The Asymmetry ◽  
Future Linear Collider

At a future linear collider, a polarized electron beam will play an important role in interpreting new physics signals. Backgrounds to a new physics reaction can be reduced by choice of the electron polarization state. The origin of a new physics reaction can be clarified by measuring its polarization-dependence. This paper examines some options for polarimetry with an emphasis on physics issues that motivate how precise the polarization determination needs to be. In addition to Compton polarimetry, the possibility of using Standard Model asymmetries, such as the asymmetry in forward W-pairs, is considered as a possible polarimeter. Both e+e- and e-e- collider modes are considered.

scholarly journals Plasma Lens Backgrounds at a Future Linear Collider

2003 ◽  
Vol 18 (16) ◽  
pp. 2857-2869
Author(s):  
Achim W. Weidemann ◽  
P. Chen ◽  
C.-K. Ng
Keyword(s):  
Linear Collider ◽  
Interaction Region ◽  
Interaction Processes ◽  
Linear Colliders ◽  
Beam Parameters ◽  
Event Rates ◽  
Different Sources ◽  
Detector Technology ◽  
Future Linear Collider

A 'plasma lens' might be used to enhance the luminosity of future linear colliders. However, its utility for this purpose depends largely on the potential backgrounds that may be induced by the insertion of such a device in the interaction region of the detector. In this note we identify different sources of such backgrounds, calculate their event rates from the elementary interaction processes, and evaluate their effects on the major parts of a hypothetical Next Linear Collider (NLC) detector. For plasma lens parameters which give a factor of seven enhancement of the luminosity, and using the NLC design for beam parameters as a reference, we find that the background yields are fairly high, and require further study and improvements in detector technology to avoid their impact.

scholarly journals Probing wrong-sign Yukawa couplings at the LHC and a future linear collider

2014 ◽  
Vol 89 (11) ◽  
Author(s):  
P. M. Ferreira ◽  
Rui Santos ◽  
John F. Gunion ◽  
Howard E. Haber
Keyword(s):  
Linear Collider ◽  
Yukawa Couplings ◽  
Wrong Sign ◽  
Future Linear Collider
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