| 1. |
- Angelopoulos, Angelos, et al.
(författare)
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Dispersion relation analysis of the neutral kaon regeneration amplitude in carbon
- 1999
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Ingår i: European Physical Journal C. - : Springer Berlin/Heidelberg. - 1434-6044 .- 1434-6052. ; 10:1, s. 19-25
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Tidskriftsartikel (refereegranskat)abstract
- We apply a forward dispersion relation to the regeneration amplitude for kaon scattering on 12" style="position: relative;" tabindex="0" id="MathJax-Element-1-Frame" class="MathJax">12C using all available data. The CPLEAR data at low energies allow the determination of the net contribution from the subthreshold region which turns out to be much smaller than earlier evaluations, solving a long standing puzzle.
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| 2. |
- Angelopoulos, A., et al.
(författare)
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K 0–KÌ„0 mass and decay-width differences : CPLEAR evaluation
- 1999
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Ingår i: Physics Letters B. - : Elsevier. - 0370-2693 .- 1873-2445. ; 471:2, s. 332-338
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Tidskriftsartikel (refereegranskat)abstract
- The CPT-violation parameters Re(δ) and Im(δ) determined recently by CPLEAR are used to evaluate the K0– mass and decay-width differences, as given by the difference between the diagonal elements of the neutral-kaon mixing matrix (M−iΓ/2). The results – GeV and GeV – are consistent with CPT invariance. The CPT invariance is also shown to hold within a few times 10−3–10−4 for many of the amplitudes describing neutral-kaon decays to different final states.
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| 3. |
- Angelopoulos, Angelos, et al.
(författare)
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K0⇋ KÌ„0 transitions monitored by strong interactions : a new determination of the K L–K S mass difference
- 2001
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Ingår i: Physics Letters B. - : Elsevier. - 0370-2693 .- 1873-2445. ; 503:1, s. 49-57
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Tidskriftsartikel (refereegranskat)abstract
- The CPLEAR set-up (modified) has been used to determine the KL–KS mass difference by a method where neutral-kaon strangeness oscillations are monitored through kaon strong interactions, rather than semileptonic decays, thus requiring no assumptions on CPT invariance for the decay amplitudes. The result, Δm=(0.5343±0.0063stat±0.0025syst)×1010ℏ/s, provides a valuable input for CPT tests.
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| 4. |
- Angelopoulos, Angelos, et al.
(författare)
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Physics at CPLEAR
- 2003
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Ingår i: Physics Reports. - : Elsevier. ; 374:3, s. 165-270
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Tidskriftsartikel (refereegranskat)abstract
- LEAR offered unique opportunities to study the symmetries which exist between matter and antimatter. At variance with other approaches at this facility, CPLEAR was an experiment devoted to the study of CP, T and CPT symmetries in the neutral-kaon system. A variety of measurements allowed us to determine with high precision the parameters which describe the time evolution of the neutral kaons and their antiparticles, including decay amplitudes, and the related symmetry properties. Limits concerning quantum-mechanical predictions (EPR, coherence of the wave function) or the equivalence principle of general relativity have been obtained. An account of the main features of the experiment and its performances is given here, together with the results achieved.
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| 5. |
- Apostolakis, A, et al.
(författare)
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A determination of the CP violation parameter η+- from the decay of strangeness-tagged neutral kaons
- 1999
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Ingår i: Physics Letters B. - : Elsevier. - 0370-2693 .- 1873-2445. ; 458:4, s. 545-552
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Tidskriftsartikel (refereegranskat)abstract
- LEAR offered unique opportunities to study the symmetries which exist between matter and antimatter. At variance with other approaches at this facility, CPLEAR was an experiment devoted to the study of CP, T and CPT symmetries in the neutral-kaon system. A variety of measurements allowed us to determine with high precision the parameters which describe the time evolution of the neutral kaons and their antiparticles, including decay amplitudes, and the related symmetry properties. Limits concerning quantum-mechanical predictions (EPR, coherence of the wave function) or the equivalence principle of general relativity have been obtained. An account of the main features of the experiment and its performances is given here, together with the results achieved.
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| 6. |
- Apostolakis, A., et al.
(författare)
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Measurement of the energy dependence of the form factor f+ in K 0 e3 decay
- 2000
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Ingår i: Physics Letters B. - : Elsevier. - 0370-2693 .- 1873-2445. ; 473:1, s. 186-192
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Tidskriftsartikel (refereegranskat)abstract
- Neutral-kaon decays to πeν were analysed to determine the q2 dependence of the K0e3 electroweak form factor f+. Based on 365612 events, this form factor was found to have a linear dependence on q2 with a slope λ+=0.0245±0.0012stat±0.0022syst.
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| 7. |
- Baranto, Adad, 1966, et al.
(författare)
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Acute chest pain in a top soccer player due to thoracic disc herniation
- 2009
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Ingår i: Spine (Phila Pa 1976). - 1528-1159. ; 34:10
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Tidskriftsartikel (refereegranskat)abstract
- STUDY DESIGN: Case report. OBJECTIVE: An unusual and previously not reported case of upper thoracic disc herniation combined with acute chest pain, is presented. SUMMARY OF BACKGROUND DATA: Disc herniation in the thoracic spine is rare. There are only a few cases of thoracic disc herniation in top athletes presented in the literature. The clinical presentation of a thoracic disc herniation can vary widely depending on its location and morphologic characteristics. Clinically, the acute symptoms may be severe. METHODS: A 24-year-old soccer player with acute left-sided chest pain that started in the middle of a soccer game has been followed clinically and with MRI examinations for 3 years. RESULTS: MRI of the thoracic spine showed a left-sided paramedial disc herniation at T2-T3 level and the right-sided paramedial disc herniation at T3-T4 level. The player was prescribed initial rest and subsequent physical rehabilitation. He had no further symptoms during rehabilitation to full training, and could resume play and remained symptom free for the rest of the season.The following season, the player experienced a similar sudden thoracic pain episode during training. This time the chest pain was right-sided. A new MRI of the thoracic spine showed unchanged findings. The initial rehabilitation was similar to the one used in the first episode. After 15 months with no symptoms during normal life the player was allowed to increase the intensity of training gradually and after 2 years the patient played soccer at elite level again. However, 3 years later the symptoms relapsed and the player ended his career after another rehabilitation period. CONCLUSION: In conclusion, it is important to consider thoracic disc herniation as acute chest pain in athletes and that the long-term prognosis of this entity is not always good.
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| 8. |
- Cahn, R N, et al.
(författare)
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Detective quantum efficiency dependence on x-ray energy weighting in mammography
- 1999
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Ingår i: Medical physics. - Medical physics : Wiley. - 0094-2405. ; 26:12, s. 2680-2683
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Tidskriftsartikel (refereegranskat)abstract
- An evaluation of the dependence of detective quantum efficiency (DQE) on the incident energy spectrum has been made for mammography. The DQE dependence on the energy spectrum has been evaluated for energy-integrating detectors, photon-counting detectors, and detectors that measure the energy of each photon. To isolate the effect of the x-ray energy spectrum the detector has been assumed to be ideal, i.e., all noise sources are assumed to be zero except for quantum fluctuations. The result shows that the improvement in DQE, if the energy-integrating detector is compared to a single-photon counting detector, is of the order of 10%. Comparing the energy-integrating detector and the detector measuring the energy for each photon the improvement is around 30% using a molybdenumanodespectrum typical in mammography. It is shown that the optimal weight factors to combine the data in the case the energy is measured are very well approximated if the weight factors are proportional to E−3." style="position: relative;" tabindex="0" id="MathJax-Element-1-Frame" class="MathJax">E−3. Another conclusion is that in calculating the DQE, a detector should be compared to one that uses ideal energy weighting for each photon since this provides the best signal-to-noise ratio. This has generally been neglected in the literature.
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| 9. |
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| 10. |
- Iacobaeus, Christian, et al.
(författare)
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A novel portal imaging device for advanced radiation therapy
- 2001
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Ingår i: Nuclear Science, IEEE Transactions on. - Nuclear Science, IEEE Transactions on : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9499 .- 1558-1578. ; 48:4, Part 2, s. 1496-1502
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