scholarly journals Sympathetic cooling of positrons to cryogenic temperatures for antihydrogen production

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
C. J. Baker ◽  
W. Bertsche ◽  
A. Capra ◽  
C. L. Cesar ◽  
M. Charlton ◽  
...  
Keyword(s):  
High Precision ◽  
Penning Trap ◽  
Dense Plasma ◽  
Bound State ◽  
Low Energy ◽  
Cryogenic Temperatures ◽  
Sympathetic Cooling ◽  
Fundamental Symmetries ◽  
Antihydrogen Production ◽  
Neutral Antimatter

AbstractThe positron, the antiparticle of the electron, predicted by Dirac in 1931 and discovered by Anderson in 1933, plays a key role in many scientific and everyday endeavours. Notably, the positron is a constituent of antihydrogen, the only long-lived neutral antimatter bound state that can currently be synthesized at low energy, presenting a prominent system for testing fundamental symmetries with high precision. Here, we report on the use of laser cooled Be+ ions to sympathetically cool a large and dense plasma of positrons to directly measured temperatures below 7 K in a Penning trap for antihydrogen synthesis. This will likely herald a significant increase in the amount of antihydrogen available for experimentation, thus facilitating further improvements in studies of fundamental symmetries.

scholarly journals Sympathetic cooling of protons and antiprotons with a common endcap Penning trap

2017 ◽  
Vol 65 (5-6) ◽  
pp. 568-576 ◽  
Author(s):  
M. Bohman ◽  
A. Mooser ◽  
G. Schneider ◽  
N. Schön ◽  
M. Wiesinger ◽  
...  
Keyword(s):  
Penning Trap ◽  
Sympathetic Cooling

scholarly journals Renormalization group consistency and low-energy effective theories

2019 ◽  
Vol 6 (5) ◽  
Author(s):  
Jens Braun ◽  
Marc Leonhardt ◽  
Jan M. Pawlowski
Keyword(s):  
Renormalization Group ◽  
Mean Field ◽  
Bound State ◽  
Field Approximation ◽  
Low Energy ◽  
Mean Field Approximation ◽  
Quantum Field Theories ◽  
Model Calculations ◽  
Effective Models ◽  
Effective Theories

Low-energy effective theories have been used very successfully to study the low-energy limit of QCD, providing us with results for a plethora of phenomena, ranging from bound-state formation to phase transitions in QCD. These theories are consistent quantum field theories by themselves and can be embedded in QCD, but typically have a physical ultraviolet cutoff that restricts their range of validity. Here, we provide a discussion of the concept of renormalization group consistency, aiming at an analysis of cutoff effects and regularization-scheme dependences in general studies of low-energy effective theories. For illustration, our findings are applied to low-energy effective models of QCD in different approximations including the mean-field approximation. More specifically, we consider hot and dense as well as finite systems and demonstrate that violations of renormalization group consistency affect significantly the predictive power of the corresponding model calculations.

scholarly journals Dispersive analysis of the Primakoff reaction $$\gamma K \rightarrow K \pi $$

2021 ◽  
Vol 81 (3) ◽  
Author(s):  
Maximilian Dax ◽  
Dominik Stamen ◽  
Bastian Kubis
Keyword(s):  
Phase Shift ◽  
High Precision ◽  
Low Energy ◽  
Wave Phase ◽  
Dispersive Analysis ◽  
Model Independent

AbstractWe provide a dispersion-theoretical representation of the reaction amplitudes $$\gamma K\rightarrow K \pi $$ γ K → K π in all charge channels, based on modern pion–kaon P-wave phase shift input. Crossed-channel singularities are fixed from phenomenology as far as possible. We demonstrate how the subtraction constants can be matched to a low-energy theorem and radiative couplings of the $$K^*(892)$$ K ∗ ( 892 ) resonances, thereby providing a model-independent framework for future analyses of high-precision kaon Primakoff data.

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