Difference between revisions of "Working Groups"

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;Working Groups
 
  
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=== <strong>Interference Physics</strong> ===
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=== <strong>Nuclear Physics</strong> ===
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''Coordinators: John Arrington (johna@anl.org), Charles Hyde (hyde@jlab.org)''
 
  
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* [[Interference Physics Sub-Group]]
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''Coordinator: Eric Voutier (voutier@ipno.in2p3.fr)''
  
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=== <strong>Charged Current Physics</strong> ===
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* [[e+ @ JLab Sub-Group]]
  
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''Coordinators: Yulia Furletova (yulia@jlab.org), Wally Melnitchouk (wmelnitc@jlab.org)''
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* [[e+ White Paper Sub-Group]]
  
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* [[Charged Current Physics Sub-Group]]
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* [[e+ @ eRHIC Sub-Group]]
  
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=== <strong>Test of the Standard Model</strong> ===
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=== <strong>Positron Source and Beam Physics</strong> ===
  
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''Coordinators: Marco Battaglieri (battaglieri@ge.infn.it), Xiaochao Zheng (xiaochao@virginia.edu)''
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''Coordinator: Joe Grames (grames@jlab.org)''
  
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Electromagnetic and electroweak interaction with polarized electron and positron beams may provide new possibilities to probe the existence of physics beyond the Standard Model. Comparison between a left-handed electron beam and a right-handed positron beam will provide the first measurement of a charge-conjugation violation observable, the effective electron-quark coupling <math>C_{3q}</math>. The <math>e^{\pm}</math> annihilation, on the other hand, is a promising channel in search of a U-boson or heavy photon, candidate of SM-Dark Matter interaction maediator. The combination of high energy and high intensity positron beam would provide the best reach achievable in terms of mass range and coupling constant in the invisible decay channel <math>e^{\pm}</math> to <math>\gamma U</math>. Polarization observables are here expected to leverage a significant role for suppressing background to identify the experimental physics signal of interest. The absence of right-handed CC within the SM forces the CC DIS cross section to be zero at maximum beam polarization <math>\pm 1</math> for <math>e^{-(+)}</math>. Measuring the beam longitudinal polarization sensitivity of the total CC cross section allows a natural SM test through searches for right-handed CC and setting limits on the right-handed W-boson exchange.
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* [[Positron Source and Beam Physics Sub-Group]]
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* [[Test of the Standard Model Sub-Group]]
 
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=== <strong>Positron Applications</strong> ===
 
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''Coordinators: Tony Forest (foretony@isu.edu), Farida Selim (faselim@bgsu.edu)''
 
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Positron annihilation spectroscopy (PAS) is a well-known technique for investigating the structural properties of materials. Because of the purity of the <math>2 \gamma</math> signal produced from the annihilation of positrons with atomic electrons, this technique is a very sensitive probe of material defects and constitutes an accurate method for the measurement of the momentum distribution of electrons. Nevertheless, the globally poor availability of intense positron beams at low energies (1-1000 keV) percludes efficient use of PAS. An MeV electron accelerator production of positrons, like that used in the PEPPo experiment, can easily provide two orders of magnitude greater beam intensities than the most powerful nuclear reactor based facility. Adding controlled and flexible polarization capabilities with the PEPPo technique at accelerator facilities, may constitute a technological breakthrough for PAS and help address the lack of low energy positron research facilities world-wide.
 
  
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* [[Positron Applications Sub-Group]]
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=== <strong>Physics with Low Energy Positron Beams</strong> ===
  
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=== <strong>Positron Source and Beam Physics</strong> ===
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''Coordinator: Farida Selim (faselim@bgsu.edu)''
  
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''Coordinators: Joe Grames (grames@jlab.org), Vasiliy Morozov (morozov@jlab.org)''
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* [[Low Energy Positrons Sub-Group]]
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The efficient transfer of polarization from electrons to positrons (>80%) has been demonstrated by the PEPPo experiment and offers a new pathway to use low energy polarized electron beams (10-100 MeV) to promptly produce polarized positrons suitable for acceleration. A challenging aspect of the positron injector is the optimization required to achieve the desired beam characteristics, such as beam intensity, transverse emittance (size), bunch length and energy spread (longitudinal emittance) necessary and be well-mated to the accelerator design (e.g. 12 GeV CEBAF, LERF, JLEIC). A core activity of this sub-group is to evaluate the user requirements, accelerator integration and assess the merits and risks of different schemes appropriate for JLab, in order to summarize and recommend the R&D needed for a successful positron physics program.
 
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* [[Positron Source and Beam Physics Sub-Group]]
 

Latest revision as of 05:27, 21 February 2020

Nuclear Physics

Coordinator: Eric Voutier (voutier@ipno.in2p3.fr)

Positron Source and Beam Physics

Coordinator: Joe Grames (grames@jlab.org)

Physics with Low Energy Positron Beams

Coordinator: Farida Selim (faselim@bgsu.edu)

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