Precision measurement of orthopositronium decay rate using SiO2 powder
نویسندگان
چکیده
منابع مشابه
Precision Measurement of Orthopositronium Decay Rate Using SiO2 Powder
The intrinsic decay rate of orthopositronium formed in SiO2 powder is measured using the direct 2γ correction method such that the time dependence of the pick-off annihilation rate is precisely determined using high energy-resolution germanium detectors. As a systematic test, two different types of SiO2 powder are used with consistent findings. The intrinsic decay rate of orthopositronium is fo...
متن کاملMeasurement of Orthopositronium Decay Rate Using SiO2 Powder: Integration of Thermalization into Time Spectrum Fitting Procedure
The intrinsic decay rate of orthopositronium (o-Ps) formed in SiO2 powder was measured using a modified method which determined the time dependence of the pick-off annihilation rate using high-energyresolution germanium detectors. That is, the main systematic error due to thermalization was accounted for and integrated into the time spectrum fitting procedure. The averaged value was found to be...
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Positronium, the bound state of an electron and positron, is an excellent laboratory to test our understanding of Quantum Electrodynamics of bound states. Although in the majority of cases the agreement between theory and experiment is very good, the case of orthopositronium (o-Ps) decay into three photons is outstanding, since the theoretical predictions differ by about 6 standard deviations f...
متن کاملOrder α 2 corrections to the decay rate of orthopositronium
Order α 2 corrections to the decay rate of orthopositronium are calculated in the framework of nonrelativistic QED. The resulting contribution is found to be in significant disagreement with one set of experimental measurements, though another experiment is in agreement with theory. The discrepancy between theory and experiment for the decay rate of orthopositronium has long been one of the out...
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In models of Randall-Sundrum type orthopositronium (o − P s) can disappear due to tunnelling into additional dimension(s). The experimental signature of this effect is the invisible decay of orthopositronium. We point out that this process may occur at a rate within two or three orders of magnitude of the present experimental upper limit. We discuss this in details and stress that the existence...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2003
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2003.08.018