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1. ICD-VAD Compatibility, Could You End up with a Deaf ICD after VAD Implantation?

Author: James Nadel, S. Baldinger, N. Kaufmann, Bruno Schnegg, Desiree Robson, Thomas Meredith, Christopher S. Hayward, and O. Wigger
Subjects: Pulmonary and Respiratory Medicine, Transplantation, medicine.medical_specialty, business.industry, Defibrillation, medicine.medical_treatment, Guideline, medicine.disease, Lower threshold, Ventricular assist device, Heart failure, Ventricular fibrillation, Medicine, Communication problem, Surgery, In patient, Cardiology and Cardiovascular Medicine, business, Intensive care medicine
Abstract: Purpose Most heart failure patients undergoing ventricular assist device (VAD) implantation are managed with guideline-based therapy including the implantation of defibrillation capable device (ICD). Prior to surgery, programming allowing therapy with lower threshold could be lifesaving. After surgery, the defibrillator should be reprogrammed to protect the patient against painful, unnecessary shocks, as the circulation will be supported even in ventricular fibrillation. Difficulties in interrogation of ICD in patients with both HeartMate-II and HeartMate3 devices have been previously reported, related to the VAD-produced electromagnetic interference. Most cases result in a problem of communication between the ICD and the corresponding interrogating console. Methods An electronic search was performed to identify all articles and abstracts published on the topic until July 2019. To the list, we added one case from our clinical experience as well as manufacturer described cases of incompatibility. Results We identified 473 publications. Fourteen publications were ultimately included. Those publications described 22 patients with device interrogation issues post VAD implantation. To regain control of the device complete replacement of the ICD/CRT/PM was performed in 10 patients, and in one the implantation side was changed. In 11 cases a shielding technique was successfully utilized. From the data, we can extract the names of 14 devices with a documented communication problem. There were no reported cases of adverse interaction between HeartWare and ICDs. Conclusion Given the reported VAD-associated EMI interaction with ICD interrogation due to interruption of the handshake-signal to initiate ICD interrogation, it is likely all the variants of one specific ICD (1 lead, 2 lead, CRT) will also suffer from the same problem. More ex-vivo research is needed to better understand the phenomenon, and clinicians and patients with the listed ICDs need to be aware of the potential loss of ICD control with HM2 or HM3.
Published: 2020
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2. Observation of an Unexpected Hardening in the Spectrum of GRB 021206

Author: Claudia Wigger, O. Wigger, Eric C. Bellm, and Wojtek Hajdas
Subjects: Physics, Space and Planetary Science, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Hardening (metallurgy), FOS: Physical sciences, Astronomy and Astrophysics, Black-body radiation, Astrophysics, Gamma-ray burst, Power law, Spectral line
Abstract: GRB 021206 is one of the brightest GRBs ever observed. Its prompt emission, as measured by RHESSI, shows an unexpected spectral feature. The spectrum has a peak energy of about 700 keV and can be described by a Band function up to 4.5 MeV. Above 4.5 MeV, the spectrum hardens again, so that the Band function fails to fit the whole RHESSI energy range up to 17 MeV. Nor does the sum of a blackbody function plus a power law, even though such a function can describe a spectral hardening. The cannonball model on the other hand predicts such a hardening, and we found that it fits the spectrum of GRB 021206 perfectly. We also analysed other strong GRBs observed by RHESSI, namely GRBs 020715, 021008, 030329, 030406, 030519B, 031027, 031111. We found that all their spectra can be fit by the cannonball model as well as by a Band function., 41 pages, 13 figures; submitted to ApJ
Published: 2008
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3. transitions monitored by strong interactions: a new determination of the KL–KS mass difference

Author: R. Le Gac, M. Schafer, P.-R. Kettle, J. R. Fry, R. Gamet, D. Zimmerman, A. Muller, L. Sakeliou, Per Carlson, L. Tauscher, A. Ealet, P. Bargassa, D. Zavrtanik, H.-J. Gerber, P. Bloch, P. Pavlopoulos, M.B. Chertok, P. Weber, F. Blanc, Sotirios Vlachos, T. Ruf, B. L. Roberts, K. Jon-And, Marcin Wladyslaw Wolter, G. Polivka, Panagiotis Kokkas, J. Derre, A. Angelopoulos, B. Pagels, Andrej Filipcic, M. Mikuž, D. Francis, Nikolaos Manthos, Lukas A. Schaller, W. Fetscher, O. Wigger, Jeffrey Boone Miller, E. Gabathuler, R. Rickenbach, Mats Danielsson, F. Henry-Couannier, C. Thibault, M. Fidecaro, O. Behnke, A. Haselden, F. Montanet, C. Eleftheriadis, A. Benelli, F. Leimgruber, A. Schopper, C.W.E. van Eijk, T. Nakada, P.J. Hayman, Michael C. Carroll, Marc Dejardin, R.W. Hollander, I. Papadopoulos, G. Backenstoss, V. Bertin, Elie Aslanides, R. Kreuger, C. Touramanis, Igor Mandić, A. Go, G. Marel, T. Schietinger, F. Touchard, and E. Cawley
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Amplitude, CPT symmetry, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Strangeness, Nuclear Experiment
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.
Published: 2001
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4. K0– mass and decay-width differences: CPLEAR evaluation

Author: V. Bertin, M. Schafer, L. Tauscher, P. Bloch, R. Le Gac, M. Wolter, E. Cawley, R. Kreuger, Marc Dejardin, F. Touchard, C. Eleftheriadis, P. Weber, A. Haselden, I. Mandić, J. R. Fry, Panagiotis Kokkas, B.L. Roberts, O. Behnke, W. Fetscher, D. Francis, T. Nakada, G. Marel, I. Papadopoulos, A. Angelopoulos, K. Jon-And, F. Leimgruber, A. Schopper, S. Vlachos, F. Montanet, P.J. Hayman, O. Wigger, A. Go, A. Ealet, D. Zimmerman, P.-R. Kettle, P. Carlson, A. Filipčič, T. Ruf, A. Apostolakis, F. Henry-Couannier, M. Fidecaro, R.W. Hollander, Jeffrey Boone Miller, Elie Aslanides, N. Manthos, C. Thibault, Michael C. Carroll, J. Derre, G. Polivka, D. Zavrtanik, P. Pavlopoulos, A. Muller, C. Touramanis, R. Gamet, F. Blanc, H.-J. Gerber, L.A. Schaller, Mats Danielsson, B. Pagels, A. Benelli, C.W.E. van Eijk, E. Gabathuler, R. Rickenbach, T. Schietinger, M.B. Chertok, G. Backenstoss, P. Bargassa, and M. Mikuž
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Matrix (mathematics), Amplitude, CPT symmetry, Quantum mechanics, Diagonal
Abstract: The CPT-violation parameters Re(δ) and Im(δ) determined recently by CPLEAR are used to evaluate the K0– K 0 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 – (M K 0 K 0 −M K 0 K 0 )=(−1.5±2.0)×10 −18 GeV and (Γ K 0 K 0 −Γ K 0 K 0 )=(3.9±4.2)×10 −18 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.
Published: 1999
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5. Pion correlations and resonance effects in annihilation at rest

Author: C. Touramanis, R. Le Gac, P. Weber, J. R. Fry, V. Bertin, Elie Aslanides, E. Cawley, A. Benelli, C.W.E. van Eijk, P. Pavlopoulos, A. Haselden, F. Montanet, R.W. Hollander, L. Tauscher, M.B. Chertok, Jeffrey Boone Miller, F. Touchard, K. Jon-And, P.-R. Kettle, W. Fetscher, A. Muller, T. Ruf, M.P. Locher, E. Gabathuler, Mats Danielsson, R. Rickenbach, F. Henry-Couannier, A. Ealet, T. Schietinger, F. Blanc, M. Schafer, I. Papadopoulos, Sotirios Vlachos, A. Angelopoulos, Nikolaos Manthos, B. Pagels, Panagiotis Kokkas, Igor Mandić, Danilo Zavrtanik, L. Faravel, P. Bloch, A. Go, M. Fidecaro, G. Backenstoss, C. Thibault, C. Eleftheriadis, Marc Dejardin, Michael C. Carroll, T. Nakada, Per Carlson, R. Kreuger, G. Polivka, A. Apostolakis, G. Marel, D. Zimmerman, Andrej Filipcic, H.-J. Gerber, Lukas A. Schaller, Marcin Wladyslaw Wolter, O. Wigger, J. Derre, O. Behnke, B.L. Roberts, F. Leimgruber, A. Schopper, P.J. Hayman, M. Mikuž, D. Francis, V.E. Markushin, R. Gamet, and P. Bargassa
Subjects: Nuclear physics, Rest (physics), Physics, Correlation, Nuclear and High Energy Physics, Particle physics, Pion, Annihilation, Invariant mass, Function (mathematics), Resonance (particle physics), Event (particle physics)
Abstract: We study ππ correlations in the exclusive reactions p p → 2π + 2π − and p p → 2π + 2π − π 0 at rest with complete reconstruction of the kinematics for each event. A new analysis technique has been developed which is model independent. With this new technique, which relies on double-differential distributions, no reference sample is needed to extract the correlation signal. The correlations are studied as a function of the four-pion invariant mass.
Published: 1999
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6. Determination of the T- and CPT-violation parameters in the neutral-kaon system using the Bell–Steinberger relation and data from CPLEAR

Author: G. Polivka, Michael C. Carroll, D. Zavrtanik, F. Touchard, M. Wolter, E. Cawley, T. Ruf, C. Touramanis, R. Kreuger, A. Apostolakis, L. Sakeliou, C. Thibault, A. Haselden, P. Weber, G. Marel, O. Behnke, P. Bargassa, L. Tauscher, F. Henry-Couannier, E. Gabathuler, R. Rickenbach, P. Pavlopoulos, J. Derre, C. Eleftheriadis, S. Vlachos, R.W. Hollander, A. Go, F. Leimgruber, P. Carlson, V. Bertin, T. Schietinger, A. Schopper, M.B. Chertok, P.J. Hayman, B.L. Roberts, C.W.E. van Eijk, R. Le Gac, M. Mikuž, E. Aslanides, A. Ealet, Panagiotis Kokkas, J. R. Fry, M. Schafer, Mats Danielsson, I. Papadopoulos, G. Backenstoss, K. Jon-And, P. Bloch, M. Fidecaro, I. Mandić, L.A. Schaller, A. Muller, A. Benelli, D. Francis, N. Manthos, H.-J. Gerber, O. Wigger, R. Gamet, D. Zimmerman, P.-R. Kettle, Jeffrey Boone Miller, F. Blanc, B. Pagels, A. Filipčič, T. Nakada, Marc Dejardin, W. Fetscher, F. Montanet, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CPLEAR, Lorgeril, Jocelyne, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Unitarity, 010308 nuclear & particles physics, media_common.quotation_subject, Value (computer science), 01 natural sciences, Asymmetry, Matrix (mathematics), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment, Mixing (physics), media_common
Abstract: Data from the CPLEAR experiment, together with the most recent world averages for some of the neutral-kaon parameters, were constrained with the Bell--Steinberger (or unitarity) relation, allowing the T-violation parameter $\ree$ and the CPT-violation parameter $\imd$ of the neutral-kaon mixing matrix to be determined with an increased accuracy: $\ree = (164.9 \pm 2.5)\times 10^{-5}$, $\imd = ( 2.4 \pm 5.0)\times 10^{-5}$. Moreover, the constraint allows the CPT-violation parameter for the neutral-kaon semileptonic decays, $\rey$, to be determined for the first time. The $\Delta S \neq \Delta Q$ parameters $\rexm$ and $\imxp$ are given with an increased accuracy. The quantity $\mathrm{Re}(y~+~x_-)$, which enters the T-violation CPLEAR asymmetry previously published, is determined to be $(0.2 \pm 0.3)\times 10^{-3}$. The value obtained for $\red$ is in agreement with the one resulting from a previous unconstrained fit and has a slightly smaller error.
Published: 1999
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7. First direct observation of time-reversal non-invariance in the neutral-kaon system

Author: Claudio Santoni, P.-R. Kettle, T. Nakada, Lukas A. Schaller, Danilo Zavrtanik, P. Bloch, R. Gamet, Sotirios Vlachos, Andrej Filipcic, A. Muller, Mats Danielsson, O. Behnke, A. Angelopoulos, V. Bertin, H.-J. Gerber, D. Zimmerman, L. Faravel, M. Fidecaro, M. Schafer, F. Leimgruber, L. Tauscher, P. Carlson, A. Schopper, P. Bargassa, E. Gabathuler, R. Rickenbach, A. Haselden, Jeffrey Boone Miller, P.J. Hayman, C. Thibault, G. Backenstoss, F. Montanet, M. Mikuž, D. Francis, Marcin Wladyslaw Wolter, A. Ealet, T. Ruf, J. Derre, P. Pavlopoulos, P. Weber, R.W. Hollander, C. Eleftheriadis, O. Wigger, R. Le Gac, M.B. Chertok, Nikolaos Manthos, A.J.P.L. Policarpo, Panagiotis Kokkas, E. Aslanides, I. Papadopoulos, K. Jon-And, Stef. Charalambous, J. R. Fry, F. Blanc, G. Polivka, B.L. Roberts, B. Pagels, W. Fetscher, C. Touramanis, F. Henry-Couannier, A. Benelli, C.W.E. van Eijk, Igor Mandić, A. Go, Marc Dejardin, Michael C. Carroll, T. Schietinger, R. Kreuger, A. Apostolakis, G. Marel, E. Cawley, and F. Touchard
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, media_common.quotation_subject, High Energy Physics::Phenomenology, Nuclear Theory, Direct observation, Charge (physics), Strangeness, Asymmetry, Decay time, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment, media_common, Lepton
Abstract: We report on the first observation of time-reversal symmetry violation through a comparison of the probabilities of K 0 transforming into K0 and K0 into K 0 as a function of the neutral-kaon eigentime t. The comparison is based on the analysis of the neutral-kaon semileptonic decays recorded in the CPLEAR experiment. There, the strangeness of the neutral kaon at time t=0 was tagged by the kaon charge in the reaction p p → K ± π ∓ K 0 ( K 0 ) at rest, whereas the strangeness of the kaon at the decay time t=τ was tagged by the lepton charge in the final state. An average decay-rate asymmetry 〈 R( K 0 t=0 → e + π − ν t=τ )−R( K 0 t=0 → e − π + ν t=τ ) R( K 0 t=0 → e + π − ν t=τ )+R( K 0 t=0 → e − π + ν t=τ ) 〉=(6.6±1.3 stat ±1.0 syst )×10 −3 was measured over the interval 1 τ S τ S , thus leading to evidence for time-reversal non-invariance.
Published: 1998
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8. Search for CP violation in the decay of tagged and K0 to π0π0π0

Author: F. Touchard, C. Touramanis, T. Schietinger, P. Weber, M.B. Chertok, M. Fidecaro, R. Le Gac, L. Faravel, O. Wigger, S. Vlachos, A. Apostolakis, J. R. Fry, L.A. Schaller, A. Benelli, C.W.E. van Eijk, G. Backenstoss, F. Henry-Couannier, V. Bertin, M. Schafer, N. Manthos, T. Nakada, O. Behnke, A. Angelopoulos, L. Tauscher, P. Bargassa, C. Thibault, Jeffrey Boone Miller, R. Kreuger, Mats Danielsson, G. Polivka, M. Mikuž, I. Mandić, F. Leimgruber, A. Schopper, E. Gabathuler, R. Rickenbach, J. Derre, G. Marel, F. Blanc, M. Wolter, E. Cawley, Elie Aslanides, A. Filipčič, Panagiotis Kokkas, B. L. Roberts, A. Haselden, D. Zimmerman, P.J. Hayman, W. Fetscher, P. Carlson, B. Pagels, Michael C. Carroll, I. Papadopoulos, K. Jon-And, P.-R. Kettle, P. Bloch, F. Montanet, D. Zavrtanik, A. Ealet, R. Gamet, R.W. Hollander, P. Pavlopoulos, T. Ruf, D. Francis, Marc Dejardin, A. Go, C. Eleftheriadis, A. Muller, and H.-J. Gerber
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Amplitude, Branching fraction, CPT symmetry, media_common.quotation_subject, Order (group theory), CP violation, Asymmetry, media_common
Abstract: The CPLEAR experiment measured the eigentime-dependent asymmetry in the rates of initially tagged K 0 and K 0 decaying to π 0 π 0 π 0 in order to study the interference between the CP-violating K S and the CP-conserving K L decay amplitudes. Without assuming CPT invariance, we obtain for the CP-violation parameter η 000 the values Re( η 000 )=0.18±0.14 stat. ±0.06 syst. and Im( η 000 )=0.15±0.20 stat. ±0.03 syst. . Requiring Re( η 000 ) to be equal to Re(ϵ) we obtain Im( η 000 )=−0.05±0.12 stat. ±0.05 syst. . The corresponding upper limit for the branching ratio of the K S →π 0 π 0 π 0 decay is deduced to be B K S →π 0 π 0 π 0 −5 at the 90% confidence level.
Published: 1998
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9. An EPR experiment testing the non-separability of the wave function

Author: M. Schafer, B.L. Roberts, Igor Mandić, V. Bertin, Elie Aslanides, P. Weber, R. Ferreira-Marques, W. Fetscher, H.-J. Gerber, Nikolaos Manthos, P.-R. Kettle, A. Benelli, C.W.E. van Eijk, C. Touramanis, Danilo Zavrtanik, Panagiotis Kokkas, A. Go, A. Muller, R. Kreuger, R. Le Gac, T. Nakada, G. Polivka, Jeffrey Boone Miller, P. Bloch, Marcin Wladyslaw Wolter, Ph. Schune, T. Schietinger, L. Tauscher, J. Derre, J. R. Fry, F. Blanc, A.J.P.L. Policarpo, A. Haselden, A. Ealet, Sotirios Vlachos, Lukas A. Schaller, C. Kochowski, Andrej Filipcic, G. Marel, T. Ruf, F. Henry-Couannier, B. Pagels, E. Gabathuler, M. Mikuž, D. Francis, R. Rickenbach, O. Behnke, P. Pavlopoulos, R.W. Hollander, M. Fidecaro, F. Leimgruber, A. Schopper, Ch Yèche, P.J. Hayman, M.B. Chertok, Marc Dejardin, G. Chardin, R. Gamet, I. Papadopoulos, P. Bargassa, K. Jon-And, O. Wigger, G. Backenstoss, Claude Guyot, Per Carlson, C. Thibault, A. Apostolakis, C. Eleftheriadis, Michael C. Carroll, E. Hubert, A. Cody, F. Touchard, E. Cawley, and F. Montanet
Subjects: Physics, Nuclear and High Energy Physics, symbols.namesake, Particle physics, Factorization, Detector, Strong interaction, symbols, EPR paradox, Function (mathematics), Strangeness
Abstract: The EPR-type strangeness correlation in the K0 system produced in the reaction at rest has been tested using the CPLEAR detector. The strangeness was tagged via strong interaction with absorbers away from the creation point. The results are consistent with the QM non-separability of the wave function and exclude a spontaneous wave-function factorisation at creation (CL >99.99%). http://www.sciencedirect.com/science/article/B6TVN-3TCVWTV-3P/1/15e4df323d79f1e3a0585a106b160a36
Published: 1998
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10. Direct determination of two-pion correlations for pp→ 2π+2π− annihilation at rest

Author: Ioannis Evangelou, O. Wigger, L. Sakeliou, Per Carlson, Panagiotis Kokkas, W. Fetscher, F. Henry-Couannier, Ch Yèche, Sotirios Vlachos, G. Chardin, V.E. Markushin, M.B. Chertok, G. Backenstoss, Danilo Zavrtanik, A. Angelopoulos, H.-J. Gerber, M.P. Locher, K. Jon-And, L. Tauscher, D. Garreta, P. Weber, J. Pinto da Cunha, C. Thibault, P. Sanders, E. Machado, C. Eleftheriadis, Nikolaos Manthos, R. Gamet, A. Go, R. Le Gac, A. Liolios, O. Behnke, A.J.P.L. Policarpo, Mats Danielsson, E. Gabathuler, R. Rickenbach, P. Bargassa, Marcin Wladyslaw Wolter, E. Hubert, A. Benelli, C.W.E. van Eijk, J. Derre, F. Leimgruber, A. Schopper, Igor Mandić, M. Fidecaro, Stef. Charalambous, J. R. Fry, P. Bloch, P.J. Hayman, Jeffrey Boone Miller, A. Haselden, V. Bertin, A. Soares, D. Zimmerman, G. Polivka, Elie Aslanides, T. Ruf, Lukas A. Schaller, Michael C. Carroll, A. Apostolakis, M. Schafer, L. Faravel, C. Touramanis, R.W. Hollander, F. Blanc, Frixos A Triantis, P. Pavlopoulos, Marc Dejardin, B.L. Roberts, I. Papadopoulos, R. Kreuger, T. Schietinger, P.-R. Kettle, B. Pagels, G. Marel, A. Muller, M. Mikuž, T. Nakada, D. Francis, A. Ealet, R. Ferreira-Marques, E. Cawley, A. Cody, Andrej Filipcic, E. van Beveren, F. Touchard, João Carvalho, and F. Montanet
Subjects: Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Skyrmion, Nuclear Theory, Charge (physics), Radius, Momentum, Nuclear physics, Pion, Symmetrization, Nuclear Experiment, Engineering (miscellaneous), Event (particle physics)
Abstract: We study ππ correlations in the exclusive reaction pp → 2π+2π− at rest measured by the CPLEAR experiment. Avoiding the introduction of an arbitrary reference sample, we analyse differential distributions for equal charge pion pairs removing the phase-space factor event by event. A peak at small relative momenta is most pronounced for large total momentum of the pair. The physical implications of bosonic symmetrization for the properties of the pion source, in particular its radius, are briefly discussed. The two extremes considered are the chaotic Hanbury-Brown-Twiss mechanism and the coherent Skyrmion model.
Published: 1998
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11. Measurement of the CP-violation parameter η00 using tagged and K0

Author: F. Leimgruber, Lukas A. Schaller, A. Schopper, E. Hubert, R. Kreuger, L. Faravel, P.J. Hayman, R. Ferreira-Marques, O. Wigger, Ch Yèche, V. Bertin, G. Marel, Elie Aslanides, P. Pavlopoulos, A. Go, D. Zimmerman, C. Touramanis, Mats Danielsson, Frixos A Triantis, Sotirios Vlachos, Ioannis Evangelou, Andrej Filipcic, T. Ruf, R. Le Gac, W. Fetscher, L. Sakeliou, A. Angelopoulos, J. Pinto da Cunha, A. Muller, C. Thibault, A. Benelli, C.W.E. van Eijk, E. Gabathuler, R. Rickenbach, R. Gamet, Per Carlson, F. Henry-Couannier, A. Haselden, Igor Mandić, C. Eleftheriadis, P. Bloch, Nikolaos Manthos, B. L. Roberts, Panagiotis Kokkas, A. Liolios, A. Ealet, João Carvalho, F. Montanet, F. Blanc, T. Nakada, P.R. Kettle, L. Tauscher, J. R. Fry, A.J.P.L. Policarpo, R.W. Hollander, Michael C. Carroll, B. Pagels, E. Machado, T. Schietinger, Danilo Zavrtanik, M.B. Chertok, Jeffrey Boone Miller, Marc Dejardin, K. Jon-And, M. Mikuž, D. Francis, P. Sanders, M. Fidecaro, P. Weber, M. Schafer, P. Bargassa, G. Chardin, A. Apostolakis, G. Backenstoss, D. Garreta, I. Papadopoulos, Stef. Charalambous, H.-J. Gerber, G. Polivka, E. van Beveren, F. Touchard, Marcin Wladyslaw Wolter, J. Derre, E. Cawley, A. Cody, and O. Behnke
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Complete data, media_common.quotation_subject, CP violation, Asymmetry, media_common
Abstract: The CP-violation parameter \etazero\ is determined through the eigentime-dependent asymmetry in the rates of initially tagged \kzerob\ and \kzero\ decaying to \pizero \pizero. From the analysis of the complete data set we obtain the values $ \absetazero = [2.47 \pm 0.31_{\mbox{stat.}} \pm 0.24_{\mbox{syst.}}] \times 10^{-3} $ and $ \phizero = 42.0^0 \pm 5.6_{\mbox{stat.}}^0 \pm 1.9_{\mbox{syst.}}^0 % \pm 0.3_{\mbox{$\Delta$m}}^0 . $
Published: 1998
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12. Measurement of CP,T and CPT violation parameters in the Neutral Kaon system at CPLEAR

Author: Andrej Filipcic, D. Francis, Marko Mikuz, A. Benelli, C.W.E. van Eijk, T. Schietinger, R. Le Gac, M. Fidecaro, C. Touramanis, Claude Guyot, E. Cawley, Ph. Schune, João Carvalho, F. Montanet, Frixos A Triantis, S. Vlachos, R. Ferreira-Marques, A. Ealet, P. Bloch, Ioannis Evangelou, Ch Yèche, B. Eckart, Elie Aslanides, F. Blanc, L. Sakeliou, J. R. Fry, C. Santoni, P. Kokkas, C. Kochowski, Marcin Wladyslaw Wolter, I. Papadopoulos, A. Haselden, E. van Beveren, A. Apostolakis, J. Derre, F. Touchard, T. Ruf, B. Pagels, O. Wigger, F. Leimgruber, Igor Mandić, D. Garreta, W. Fetscher, G. Polivka, R.W. Hollander, A. Go, R. Rickenbach, R. Gamet, A. Cody, T. Alhalel, M. Carroll, H.-J. Gerber, O. Behnke, A. Soares, J. Pinto da Cunha, P.R. Kettle, L. Tauscher, C. Felder, Mats Danielsson, R. Adler, E. Machado, P. Fassnacht, E. Hubert, A.J.P.L. Policarpo, A. Schopper, F. Henry-Couannier, D. Zimmerman, P. Carlson, P.J. Hayman, P. Sanders, Marc Dejardin, M.B. Chertok, Jeffrey Boone Miller, P. Weber, E. Gabathuler, V. Bertin, A. Angelopoulos, K. Jon-And, M. Schafer, P. Bargassa, Christopher Bee, Danilo Zavrtanik, R. Kreuger, G. Marel, Michael C. Carroll, L. Faravel, Lukas A. Schaller, T. Nakada, G. Chardin, P. Paylopoulos, G. Backenstoss, Stef. Charalambous, Nikolaos Manthos, A. Liolios, C. Thibault, B. L. Roberts, and C. Eleftheriadis
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Secondary education, Large Hadron Collider, Planck scale, CPT symmetry, Information storage, symbols.namesake, symbols, High Energy Physics::Experiment, Quantum, Research method, Coherence (physics)
Abstract: The CPLEAR experiment at CERN measures the time dependent decay rate asymmetries of initially pure K0 and K 0 states to study CP,T and CPT symmetries in the neutral kaon system. The latest results on η+−, Δm and x are reported, as well as direct tests of T violation and CPT violation in K0- K 0 oscillations. Our results are consistent with CPT invariance and allow for an improved limit on the K0- K 0 mass difference. Further, a possible loss of quantum coherence of the neutral kaon system has been tested to a level near the Planck scale.
Published: 1997
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13. The CPLEAR-Experiment at CERN

Author: Christopher Bee, Marcin Wladyslaw Wolter, G. Chardin, J. Derre, Mats Danielsson, G. Backenstoss, Ch Yèche, R. Adler, A. Go, B. Eckart, T. Schietinger, A.J.P.L. Policarpo, A. Apostolakis, T. Alhalel, M.B. Chertok, Stef. Charalambous, A. Soares, P. Fassnacht, R. Le Gac, H.-J. Gerber, L. Faravel, D. Garreta, C. Felder, J. R. Fry, K. Jon-And, P. Bargassa, G. Polivka, Lukas A. Schaller, E. Hubert, W. Fetscher, P.R. Kettle, L. Tauscher, A. Haselden, E. Machado, Ph. Schune, D. Francis, Jeffrey Boone Miller, F. Henry-Couannier, A. Ealet, T. Ruf, O. Behnke, Claudio Santoni, Andrej Filipcic, R.W. Hollander, Marc Dejardin, Nikolaos Manthos, Danilo Zavrtanik, D. Zimmerman, Claude Guyot, F. Leimgruber, P. Pavlopoulos, A. Liolios, João Carvalho, F. Montanet, A. Schopper, M. Fidecaro, P. Weber, T. Nakada, P.J. Hayman, J. Pinto Dacunha, R. Ferreira-Marques, P. Sanders, M. Mikuz, I. Papadopoulos, R. Kreuger, Panagiotis Kokkas, O. Wigger, F. Blanc, C. Kochowski, R. Gamet, Ioannis Evangelou, G. Marel, B. Pagels, L. Sakeliou, M. Schafer, Per Carlson, Michael C. Carroll, C. Thibault, B. L. Roberts, C. Eleftheriadis, E. van Beveren, Sotirios Vlachos, F. Touchard, A. Angelopoulos, Igor Mandić, A. Cody, E. Gabathuler, R. Rickenbach, V. Bertin, Elie Aslanides, C. Touramanis, Frixos A Triantis, A. Benelli, C.W.E. van Eijk, E. Cawley, and P. Bloch
Subjects: Nuclear physics, Rest (physics), Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Large Hadron Collider, High Energy Physics::Phenomenology, Measure (physics), High Energy Physics::Experiment, Atomic and Molecular Physics, and Optics
Abstract: The CPLEAR experiment uses tagged K0 and K0 produced in pp annihilation at rest to measure CP-, T- and CPT-violation parameters in the neutral kaon system. The results of these measurements and some implications are reported.
Published: 1997
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14. An upper limit for the branching ratio of the decay Ks → e+e−

Author: A. Angelopoulos, A. Apostolakis, E. Aslanides, G. Backenstoss, P. Bargassa, O. Behnke, A. Benelli, V. Bertin, F. Blanc, P. Bloch, P. Carlson, M. Carroll, J. Carvalho, E. Cawley, S. Charalambous, G. Chardin, M.B. Chertok, A. Cody, M. Danielsson, M. Dejardin, J. Derre, A. Ealet, C. Eleftheriadis, I. Evangelou, L. Faravel, R. Ferreira-Marques, W. Fetscher, M. Fidecaro, A. Filipčič, D. Francis, J. Fry, E. Gabathuler, R. Gamet, D. Garreta, H.-J. Gerber, A. Go, A. Haselden, P.J. Hayman, F. Henry-Couannier, R.W. Hollander, E. Hubert, K. Jon-And, P.-R. Kettle, P. Kokkas, R. Kreuger, R. Le Gac, F. Leimgruber, A. Liolios, E. Machado, I. Mandić, N. Manthos, G. Marel, M. Mikuž, J. Miller, F. Montanet, A. Muller, T. Nakada, B. Pagels, I. Papadopoulos, P. Pavlopoulos, J. Pinto da Cunha, A. Policarpo, G. Polivka, R. Rickenbach, B.L. Roberts, T. Ruf, L. Sakeliou, P. Sanders, M. Schäfer, L.A. Schaller, T. Schietinger, A. Schopper, A. Soares, L. Tauscher, C. Thibault, F. Touchard, C. Touramanis, F. Triantis, E. Van Beveren, C.W.E. Van Eijk, S. Vlachos, P. Weber, O. Wigger, M. Wolter, C. Yeche, D. Zavrtanik, and D. Zimmerman
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, High signal intensity, Branching fraction, CP violation, Limit (mathematics)
Abstract: A search for the decay KS → e+e− was performed within the framework of the CPLEAR experiment. Full event reconstruction together with e/π separation allowed powerful background rejection and high signal acceptance. The analysis of the complete set of data yields the result: BR(KS → e+e−) < 1.4 × 10−7 (90% CL), an improvement on the current experimental limit by a factor of 20.
Published: 1997
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15. Upper limit for the branching ratio of KS → e+e− decay

Author: P. Bargassa, O. Behnke, Christopher Bee, Ch Yèche, B. Eckart, A. Haselden, P. Pavlopoulos, P. Sanders, F. Leimgruber, A. Schopper, Sotirios Vlachos, T. Alhalel, R. Adler, R.W. Hollander, P. Weber, A. Angelopoulos, P.J. Hayman, H.-J. Gerber, A. Go, W. Fetscher, P. Fassnacht, R. Le Gac, Panagiotis Kokkas, R. Ferreira-Marques, C. Eleftheriadis, Mats Danielsson, A. Soares, J. R. Fry, F. Henry-Couannier, C. Touramanis, J. Pinto da Cunha, E. Hubert, Ph. Schune, M. Miku, Michael C. Carroll, D. Garreta, I. Mandié, M.B. Chertok, Lukas A. Schaller, L. Faravel, T. Ruf, A. Ealet, Frixos A Triantis, K. Jon-And, Claudio Santoni, O. Wigger, Marcin Wladyslaw Wolter, J. Derre, Danilo Zavrtanik, P.R. Kettle, L. Tauscher, D. Zimmerman, D. Francis, A.J.P.L. Policarpo, A. Apostolakis, João Carvalho, F. Montanet, E. Machado, Claude Guyot, Jeffrey Boone Miller, A. Benelli, C.W.E. van Eijk, T. Nakada, Ioannis Evangelou, R. Gamet, F. Blanc, L. Sakeliou, C. Kochowski, V. Bertin, M. Schafer, Elie Aslanides, B. Pagels, R. Kreuger, Per Carlson, E. Gabathuler, R. Rickenbach, G. Marel, Marc Dejardin, P. Bloch, Nikolaos Manthos, A. Liolios, I. Papadopoulos, C. Felder, T. Schietinger, A. Filipĉič, G. Chardin, E. Cawley, M. Fidecaro, G. Backenstoss, A. Cody, C. Thibault, B. L. Roberts, E. van Beveren, F. Touchard, Stef. Charalambous, and G. Polivka
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle decay, Meson, Branching fraction, Quantum mechanics, Hadron, Elementary particle, Limit (mathematics), Atomic and Molecular Physics, and Optics, Calorimeter, Boson
Abstract: A measurement of the branching ratio for K s → e + e − decay was performed with the CPLEAR detector at LEAR. Full event reconstruction together with calorimeter e/π separation allowed for powerful background rejection and high signal acceptance. Analysis of data taken up to 1994 yields the result: Br(K s → e + e − ) −7 (90 % CL).
Published: 1997
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16. Experimental measurement of the ratio in antiproton annihilations at rest in gaseous hydrogen at 15 and 27 bar

Author: Ioannis Evangelou, C. Thibault, L. Sakeliou, R. Gamet, A. Soares, C. Eleftheriadis, Per Carlson, A. Cody, R. Kreuger, E. van Beveren, F. Touchard, M. Schafer, Jeffrey Boone Miller, E. Cawley, P.-R. Kettle, A. Go, Lukas A. Schaller, T. Alhalel, G. Marel, Ch Yèche, M. Mikuž, A. Muller, B. Eckart, C. Touramanis, D. Francis, Stef. Charalambous, L. Tauscher, Frixos A Triantis, H.-J. Gerber, Mats Danielsson, Ph. Schune, I. Papadopoulos, E. Machado, A. Ealet, M. Fidecaro, R. Ferreira-Marques, F. Blanc, P. Fassnacht, G. Polivka, Rr. Adler, C. Kochowski, Claudio Santoni, P. Pavlopoulos, D. Garreta, Danilo Zavrtanik, E. Hubert, T. Ruf, M.B. Chertok, B. Pagels, L. Faravel, J. Pinto da Cunha, B.L. Roberts, D. Zimmerman, João Carvalho, K. Jon-And, F. Montanet, A. Benelli, C.W.E. van Eijk, Panagiotis Kokkas, Michael C. Carroll, P. Sanders, W. Fetscher, P. Weber, Marc Dejardin, G. Chardin, Marcin Wladyslaw Wolter, J. Derre, A. Haselden, T. Nakada, R. Le Gac, G. Backenstoss, A.J.P.L. Policarpo, C. Felder, V. Bertin, A. Apostolakis, R.W. Hollander, Elie Aslanides, J. R. Fry, Sotirios Vlachos, F. Henry-Couannier, A. Angelopoulos, Andrej Filipcic, Nikolaos Manthos, A. Liolios, Claude Guyot, P. Bargassa, Christopher Bee, Igor Mandić, O. Behnke, F. Leimgruber, A. Schopper, P.J. Hayman, O. Wigger, T. Schietinger, P. Bloch, E. Gabathuler, and R. Rickenbach
Subjects: Physics, Nuclear and High Energy Physics, Annihilation, Antiproton, Gaseous hydrogen, Atomic physics
Abstract: The ratio R between the branching fractions of p p → K S K S and p p → K S K L for antiprotons annihilating at rest in gaseous hydrogen at 27 bar pressure was measured with the CPLEAR detector to be R(27 bar) = 0.037 ± 0.002. The fraction of P-wave annihilation at rest at this target density was deduced to be 0.45 ± 0.06. A value of R was also measured at 15 bar, with less statistics, yielding R(15 bar) = 0.041 ± 0.009.
Published: 1997
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17. Results of CPLEAR

Author: Ioannis Evangelou, Ch Yèche, B. Eckart, L. Sakeliou, O. Behnke, Nikolaos Manthos, W. Fetscher, F. Henry-Couannier, F. Blanc, P.R. Kettle, L. Tauscher, F. Leimgruber, R. Kreuger, P. Fassnacht, A. Liolios, E. Machado, R. Gamet, A. Schopper, E. Hubert, C. Kochowski, P. Sanders, P.J. Hayman, P. Weber, Elie Aslanides, Christopher Bee, B. Pagels, G. Marel, R. Ferreira-Marques, T. Schientinger, D. Zimmerman, M. Mikuz, T. Ruf, E. van Beveren, A. Apostolakis, Claudio Santoni, P. Carlson, A.J.P.L. Policarpo, R. Le Gac, F. Touchard, Mats Danielsson, R. Adler, C. Touramanis, V. Bertin, D. Garreta, Marc Dejardin, Michael C. Carroll, Frixos A Triantis, D. Francis, I. Papadopoulos, João Carvalho, M. Schafer, F. Montanet, J. R. Fry, M.B. Chertok, A. Cody, Sotirios Vlachos, A. Go, I. Mandlic, K. Jon-And, A. Angelopoulos, Lukas A. Schaller, P. Pavlopoulos, J. Pinto da Cunha, A. Soares, A. Haselden, Jeffrey Boone Miller, E. Cawley, P. Bargassa, Ph. Schune, R.W. Hollander, Danilo Zavrtanik, A. Ealet, A. Benelli, C.W.E. van Eijk, G. Chardin, M. Fidecaro, Andrej Filipcic, C. Felder, G. Backenstoss, Claude Guyot, Panagiotis Kokkas, T. Nakada, Stef. Charalambous, G. Polivka, C. Thibault, B. L. Roberts, C. Eleftheriadis, E. Gabathuler, R. Rickenbach, L. Faravel, P. Bloch, T. Alhalel, H.-J. Gerber, O. Wigger, Marcin Wladyslaw Wolter, and J. Derre
Subjects: Nuclear physics, Rest (physics), Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Measure (physics), Atomic and Molecular Physics, and Optics
Abstract: The CPLEAR experiment uses tagged K 0 and K 0 produced in pp annihilation at rest to measure CP-, T- and CPT-violation parameters in the neutral kaon system. The results of these measurements and some implications are reported.
Published: 1997
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18. Measurement of η+− with the CPLEAR experiment

Author: C. Thibault, Andrej Filipcic, B. L. Roberts, C. Eleftheriadis, Claude Guyot, L. Faravel, M.B. Chertok, T. Ruf, Ch Yèche, B. Eckart, Claudio Santoni, K. Jon-And, J. Pinto da Cunha, Danilo Zavrtanik, P. Sanders, T. Schietinger, R. Le Gac, João Carvalho, F. Montanet, T. Alhalel, P. Bloch, M. Schafer, G. Chardin, A. Haselden, G. Backenstoss, Jeffrey Boone Miller, H.-J. Gerber, J. R. Fry, W. Fetscher, Stef. Charalambous, R.W. Hollander, G. Polivka, P.R. Kettle, L. Tauscher, O. Behnke, A. Go, Sotirios Vlachos, A. Benelli, C.W.E. van Eijk, M. Fidecaro, E. Machado, Marcin Wladyslaw Wolter, J. Derre, F. Blanc, F. Henry-Couannier, A. Soares, A. Angelopoulos, A. Apostolakis, Mats Danielsson, R. Adler, E. Gabathuler, P. Fassnacht, C. Kochowski, D. Francis, D. Garreta, Nikolaos Manthos, R. Rickenbach, F. Leimgruber, A. Schopper, A. Liolios, C. Touramanis, P.J. Hayman, T. Nakada, B. Pagels, Igor Mandić, R. Gamet, E. Hubert, C. Felder, Frixos A Triantis, P. Pavlopoulos, Christopher Bee, A.J.P.L. Policarpo, R. Ferreira-Marques, O. Wigger, M. Miku, P. Weber, D. Zimmerman, V. Bertin, Elie Aslanides, Ioannis Evangelou, Marc Dejardin, Panagiotis Kokkas, L. Sakeliou, Lukas A. Schaller, P. Bargassa, Per Carlson, R. Kreuger, I. Papadopoulos, G. Marel, Michael C. Carroll, Ph. Schune, A. Ealet, E. van Beveren, F. Touchard, A. Cody, and E. Cawley
Subjects: Systematic error, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Computer science, Statistics, Measure (mathematics), Atomic and Molecular Physics, and Optics
Abstract: The CPLEAR experiment at CERN uses time-dependent decay-rate asymmetries between K 0 and K 0 to measure η +− . The analysis and the systematic errors are discussed. The preliminary results from all our data are φ +− = 43.5 0 ± 0.5 0 stat ± 0.5 syst ± 0.4 Δm and | η +−| = (2.316 ± 0.025 stat ± 0.028 syst ± 0.009 τ S ) × 10 −3 . The dominant part in the systematic error of φ +− is due to the regeneration correction. A dedicated experiment was performed to reduce this error considerably.
Published: 1997
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19. The CPLEAR detector at CERN

Author: K. Philippoussis, H. Verweij, G. Backenstoss, P. Bloch, G. Kesseler, A. Haselden, Andrej Filipcic, P. Pavlopoulos, F. Louis, D. Damianoglou, E. Rozaki, Panagiotis Kokkas, Dominique Durand, P.-R. Kettle, M. Bonnet, F. Bal, H.U. Johner, Claude Guyot, M. Steinacher, P. Petit, T. Alhalel, R.W. Hollander, Andras Kerek, Ch Yèche, D.A. Troster, L. Faravel, M. Mikuž, D. Francis, O. Behnke, B. Eckart, Sp. Dedoussis, J. Duclos, K. Sarigiannis, C. Engster, J.P. Bard, E. Gabathuler, M. Dedieu, R. Rickenbach, T. Ruf, Mats Danielsson, R. Adler, N. Dudragne, C. Jacobs, C.P. Marin, P. Weber, Ph. Schune, E. Machado, M. Schafer, V. Bertin, P.F. Harrison, H.-J. Gerber, F. Leimgruber, A. Schopper, K. Jansson, H. Martin, Christopher Bee, L. Sacks, Ioannis Evangelou, W.G. Heyes, P. Gumplinger, M. Dodgson, R. Le Gac, A. Ealet, T. Nakada, H. Postma, E. Hazen, L. Sakeliou, R. Daniel, Ch. Bula, E. Aslanides, Nikolaos Manthos, P Harrison, P.J. Hayman, W. Albrecht, F. Nanni, M. Chardalas, Per Carlson, H. Tschopp, M.B. Chertok, A. Liolios, D. Lecouturier, Ch. Rhême, D. Garreta, J.C. Michau, W. Fetscher, C. Witzig, J. R. Fry, M. Fidecaro, P. Fassnacht, A. Benelli, C.W.E. van Eijk, Christer Fuglesang, G. S. Varner, A. Go, E. Hubert, M. Dröge, K. Jon-And, S. Tatsis, Claudio Santoni, Marc Dejardin, B.L. Roberts, Lukas A. Schaller, A. Calzas, F. Blanc, U. Mall, D. King, R. Gamet, C. Touramanis, T. Geralis, D. Guyon, C. Kochowski, N. Karkour, D. Zimmerman, T. Klados, Frixos A Triantis, Danilo Zavrtanik, F. Henry-Couannier, C. Felder, D. Barraca, B. Pagels, A. Soares, D. Linget, João Carvalho, F. Montanet, L. Tauscher, P. Dechelette, P. Tsilimigras, B. Lofstedt, K. Kontek, Marcin Wladyslaw Wolter, P. Sanders, I. Papadopoulos, J. Derre, F. Pelucchi, P. Maley, O. Wigger, B. van Koningsveld, Jeffrey Boone Miller, A.J.P.L. Policarpo, D. Geiss, T. Lawry, H. Wendler, G. Chardin, Jean-Louis Faure, J. Kern, C. Thibault, C. Eleftheriadis, Stef. Charalambous, D. Warner, G. Polivka, Michael C. Carroll, R. Kreuger, A. Apostolakis, G. Marel, I. Tsamouranis, P. Charra, Sotirios Vlachos, A. Angelopoulos, J. Pinto da Cunha, A. Onofre, T. Schietinger, J. Bennet, Igor Mandić, A. Dijksman, J.P. Vanuxem, Y. Gally, R. Ferreira-Marques, E. van Beveren, F. Touchard, J. A. P. Da Silva, A. Cody, B. Dinkespiller, E. Cawley, E. Watson, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), CPLEAR, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Lorgeril, Jocelyne
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Large Hadron Collider, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Cherenkov detector, Detector, Tracking (particle physics), 7. Clean energy, 01 natural sciences, Particle identification, law.invention, Nuclear physics, Time of flight, law, Antiproton, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Detectors and Experimental Techniques, 010306 general physics, Instrumentation
Abstract: The CPLEAR collaboration has constructed a detector at CERN for an extensive programme of CP-, T- and CPT-symmetry studies using ${\rm K}^0$ and $\bar{\rm K}^0$ produced by the annihilation of $\bar{\rm p}$'s in a hydrogen gas target. The ${\rm K}^0$ and $\bar{\rm K}^0$ are identified by their companion products of the annihilation ${\rm K}^{\pm} \pi^{\mp}$ which are tracked with multiwire proportional chambers, drift chambers and streamer tubes. Particle identification is carried out with a liquid Cherenkov detector for fast separation of pions and kaons and with scintillators which allow the measurement of time of flight and energy loss. Photons are measured with a lead/gas sampling electromagnetic calorimeter. The required antiproton annihilation modes are selected by fast online processors using the tracking chamber and particle identification information. All the detectors are mounted in a 0.44 T uniform field of an axial solenoid of diameter 2 m and length 3.6 m to form a magnetic spectrometer capable of full on-line reconstruction and selection of events. The design, operating parameters and performance of the sub-detectors are described.}
Published: 1996
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20. Measurement ofCP violation parameters and test ofCPT invariance with$$\overline {K^0 } $$ and K0 at LEARand K0 at LEAR

Author: Lukas A. Schaller, Danilo Zavrtanik, R. Le Gac, L. Tauscher, E. Machado, Nikolaos Manthos, A. Liolios, L. Faravel, P. R. Kettle, F. Blanc, Marc Dejardin, P. Sanders, A. Go, Sp. Dedoussis, A.J.P.L. Policarpo, C. Kochowski, J. R. Fry, W. Fetscher, A. Cody, Ph. Schune, G. S. Varner, A. Ealet, M. Schafer, J. Duclos, B. Pagels, E. Rozaki, R. Kreuger, A. Haselden, C. Thibault, I. Papadopoulos, G. Marel, T. Nakada, P. Pavlopoulos, B. L. Roberts, V. Bertin, C. Felder, Claudio Santoni, Andrej Filipcic, Elie Aslanides, C. Eleftheriadis, R.W. Hollander, Michael C. Carroll, João Carvalho, F. Montanet, Mats Danielsson, R. Adler, P. Weber, F. Henry-Couannier, Claude Guyot, A. Apostolakis, O. Wigger, O. Behnke, D. Garreta, F. Leimgruber, Ch Yèche, E. van Beveren, B. Eckart, F. Touchard, Frixos A Triantis, P.J. Hayman, E. Cawley, R. Gamet, Stef. Charalambous, T. Ruf, Marko Mikuz, Marcin Wladyslaw Wolter, J. Derre, G. Polivka, A. Benelli, C.W.E. van Eijk, R. Ferreira-Marques, Ioannis Evangelou, Ch. Bula, L. Sakeliou, J. Pinto da Cunha, M. Fidecaro, Per Carlson, G. Chardin, Jean-Louis Faure, G. Backenstoss, K. Sarigiannis, P. Fassnacht, Panagiotis Kokkas, A. Onofre, Igor Mandić, Christopher Bee, D. Francis, E. Hubert, T. Alhalel, A. Schopper, E. Gabathuler, R. Rickenbach, H.-J. Gerber, Sotirios Vlachos, D. Zimmerman, A. Angelopoulos, M. Chardalas, M.B. Chertok, K. Jon-And, A. Soares, C. Touramanis, Jeffrey Boone Miller, and P. Bloch
Subjects: Physics, Nuclear physics, Particle physics, Large Hadron Collider, Overline, Homogeneous space, Parity (physics), General Agricultural and Biological Sciences
Abstract: The CPLEAR experiment at CERN studies theCP, T andCPT symmetries in the neutral-kaon system by measuring the rate asymmetries between the decays of initially pure K0 and $$\overline {K^0 } $$ states. Using data taken between 1990 and mid 1994, precise measurements of |η+-|,φ +- and Δm are reported. The comparison of φ+- the superweak phase gives one of the most sensitive tests ofCPT invariance and leads to a new limit on the $$K^0 - \overline {K^0 } $$ mass difference.
Published: 1996
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21. Observation of the CP-conserving Ks → π+π−π0 decay amplitude

Author: L. Faravel, P. Carlson, W. Fetscher, H. Postma, F. Henry-Couannier, O. Behnke, D. Garreta, M. Mikuž, L. Sacks, F. Leimgruber, Ioannis Evangelou, A. Schopper, D. Francis, C. Witzig, J. Duclos, R. Ferreira-Marques, Mats Danielsson, R. Adler, P.J. Hayman, P.F. Harrison, Andrej Filipcic, J. Derre, P.-R. Kettle, H.U. Johner, E. Gabathuler, R. Rickenbach, P. Gumplinger, Ch Yèche, Stef. Charalambous, B. Eckart, O. Wigger, L. Tauscher, L. Sakeliou, C. Touramanis, R. Le Gac, Claude Guyot, F. Blanc, T. Ruf, E. Machado, J. K. Bienlein, Frixos A Triantis, R. Gamet, Philippe Bloch, P. Pavlopoulos, Ph. Schune, G. Polivka, C. Kochowski, E. Aslanides, L.A. Schaller, Panagiotis Kokkas, K. Jansson, A. Ealet, T. Geralis, B.L. Roberts, M. Chardalas, M.B. Chertok, B. Pagels, Sotirios Vlachos, Danilo Zavrtanik, K. Jon-And, A. Angelopoulos, Claudio Santoni, G. Backenstoss, P. Fassnacht, R. Kreuger, A. Haselden, J. R. Fry, J. Pinto da Cunha, E. Rozaki, E. Hubert, A. Benelli, C.W.E. van Eijk, D.A. Troster, Sp. Dedoussis, Marcin Wladyslaw Wolter, F. Pelucchi, João Carvalho, F. Montanet, D. Zimmerman, Jeffrey Boone Miller, G. S. Varner, R.W. Hollander, C. Fuglesang, A. Onofre, M. Schafer, T. Lawry, Nikolaos Manthos, C. Felder, T. Alhalel, V. Bertin, T. Schietinger, Ch. Bula, M. Dodgson, A. Go, H.-J. Gerber, W.G. Heyes, A. Soares, A. Liolios, G. Chardin, Jean-Louis Faure, M. Fidecaro, A. Apostolakis, J. Bennet, I. Papadopoulos, C. Thibault, P. Maley, G. Marel, T. Nakada, P. Sanders, C. Eleftheriadis, Igor Mandić, A.J.P.L. Policarpo, P. Weber, Marc Dejardin, Michael C. Carroll, Christopher Bee, A. Cody, K. Sarigiannis, E. Cawley, E. van Beveren, and F. Touchard
Subjects: Physics, Nuclear and High Energy Physics, Amplitude, Branching fraction, Quantum mechanics, Phase space, Zero (complex analysis), Atomic physics, Interference (wave propagation)
Abstract: The interference between CP-conserving Ks and K L → π + π − π 0 decay amplitudes was observed by studying the decay rate asymmetries between initial K 0 and K 0 separately for the phase space regions E CM ( π + ) > E CM ( π − ) and E CM ( π + ) E CM ( π − ). For the parameter λ we found Re(λ) = 0.036 ± 0.010(stat.) −0.003 +0.002 (syst.) and Im(λ) consistent with zero, leading to a branching ratio B = [4.1 −1.9 +2.5 (stat.) −0.6 +0.5 (syst.)] × 10 −7 for the CP-conserving K S → π + π − π 0 decay.
Published: 1996
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22. Evaluation of the phase of the CP violation parameter η+− and the KL - KS mass difference from a correlation analysis of different experiments

Author: Ch Yèche, B. Eckart, M. Mikuž, D. Francis, Igor Mandić, J. Derre, P. Fassnacht, C. Touramanis, E. van Beveren, F. Touchard, Frixos A Triantis, R. Gamet, L.A. Schaller, A. Haselden, O. Wigger, R. Ferreira-Marques, Christopher Bee, J. Pinto da Cunha, P. Carlson, W. Fetscher, E. Hubert, A. Cody, T. Schietinger, R.W. Hollander, L. Tauscher, C. Felder, F. Henry-Couannier, V. Bertin, Andrej Filipcic, D. Garreta, E. Machado, D. Zimmerman, Claudio Santoni, Ph. Schune, Jeffrey Boone Miller, Mats Danielsson, R. Adler, T. Nakada, Claude Guyot, A. Ealet, Michael C. Carroll, T. Ruf, L. Faravel, João Carvalho, A. Benelli, C.W.E. van Eijk, M.B. Chertok, E. Cawley, F. Montanet, K. Jon-And, P. Pavlopoulos, Marcin Wladyslaw Wolter, Danilo Zavrtanik, G. Backenstoss, G. Chardin, F. Blanc, O. Behnke, E. Gabathuler, R. Rickenbach, P.-R. Kettle, C. Kochowski, Panagiotis Kokkas, Ioannis Evangelou, F. Leimgruber, A. Schopper, B. Pagels, A. Go, R. Kreuger, L. Sakeliou, Marc Dejardin, P.J. Hayman, Nikolaos Manthos, A. Soares, A. Apostolakis, G. Marel, Sotirios Vlachos, A. Liolios, C. Thibault, B.L. Roberts, P. Sanders, A. Angelopoulos, M. Fidecaro, C. Eleftheriadis, A.J.P.L. Policarpo, H.-J. Gerber, I. Papadopoulos, Stef. Charalambous, G. Polivka, M. Schafer, P. Weber, R. Le Gac, E. Aslanides, J. R. Fry, G. S. Varner, and Philippe Bloch
Subjects: Physics, Nuclear and High Energy Physics, Quantum mechanics, Phase (matter), Correlation analysis, Analytical chemistry, CP violation
Abstract: The best estimation of ϕ +− (the phase of the CP violation parameter η +− ) and of Δm (the K L - K S mass difference) is obtained by averaging the results of different experiments, taking into account the different correlation, existing for most of the experiments, between the measurement of ϕ +− and Δm . Including the recent measurements, we obtain the average values 〈Δm〉 = (530.7 ± 1.3) × 10 7 ħ/s and 〈 ϕ +− 〉 = 43.82° ± 0.63°. This value of ϕ +− is in good agreement with the superweak phase ϕ SW = 43.49° ± 0.08°.
Published: 1996
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23. Measurement of the CP violation parameter η+− using tagged K0 and 0

Author: M. Chardalas, M.B. Chertok, K. Jon-And, T. Alhalel, R. Le Gac, M. Schafer, A. Haselden, C. Thibault, J. Bennet, Andrej Filipcic, R.W. Hollander, Claudio Santoni, C. Felder, P. Carlson, Mats Danielsson, R. Adler, W. Fetscher, T. Nakada, Igor Mandić, R. Ferreira-Marques, E. Cawley, C. Eleftheriadis, E. Aslanides, J. R. Fry, João Carvalho, F. Montanet, H.U. Johner, Claude Guyot, P.F. Harrison, H.-J. Gerber, F. Henry-Couannier, W.G. Heyes, G. S. Varner, P.-R. Kettle, V. Bertin, L. Tauscher, Ch Yèche, B. Eckart, O. Wigger, L. Faravel, P. Sanders, E. Machado, J. Derre, Panagiotis Kokkas, D. Garreta, G. Policarpo, D. Gamet, Stef. Charalambous, C. Touramanis, J. K. Bienlein, Nikolaos Manthos, B.L. Roberts, Ch. Bula, Frixos A Triantis, O. Behnke, A. Liolios, A. Cody, L. Sacks, Philippe Bloch, M. Dodgson, Marc Dejardin, F. Leimgruber, Sp. Dedoussis, G. Polivka, Sotirios Vlachos, A. Schopper, M. Fidecaro, T. Schietinger, H. Postma, T. Geralis, A. Benelli, C.W.E. van Eijk, P.J. Hayman, Danilo Zavrtanik, A. Go, A. Angelopoulos, Ph. Schune, G. Backenstoss, Marcin Wladyslaw Wolter, J. Pinto da Cunha, I. Papadopoulos, P. Weber, A. Ealet, F. Pelucchi, T. Lawry, J. Duclos, E. van Beveren, F. Touchard, P. Maley, A. Soares, M. Mikuž, D. Francis, P. Pavlopoulos, A. Onofre, T. Ruf, R. Gamet, K. Jansson, G. Chardin, Jean-Louis Faure, L.A. Schaller, E. Rozaki, C. Witzig, K. Sarigiannis, F. Blanc, C. Kochowski, Christopher Bee, B. Pagels, Jeffrey Boone Miller, C. Fuglesang, Ioannis Evangelou, R. Kreuger, E. Gabathuler, R. Rickenbach, P. Gumplinger, A. Apostolakis, G. Marel, L. Sakeliou, Michael C. Carroll, P. Fassnacht, E. Hubert, D. Zimmerman, and D.A. Troster
Subjects: Nuclear physics, Physics, Semileptonic decay, Nuclear and High Energy Physics, media_common.quotation_subject, CP violation, Asymmetry, media_common
Abstract: The CP violation parameter η+− is determined through the eigentime-dependent asymmetry in the rates of initially tagged K0 and K 0 decaying to π+π−. The obtained values are |η+−| = (2.312 ± 0.043stat. ± 0.030syst. ± 0.011τs) × 10−3 and Φ+− = 42.7° ± 0.9stat.° ± 0.6syst.° ± 0.9Δm° with Δ = (527.4 ± 2.9) × 10 7 h gs −1 measured in the same experiment using the semileptonic decay channel.
Published: 1995
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24. Inclusive measurement of $$\bar p$$ annihilation at rest in gaseous hydrogen to final states containingρ andf 2

Author: R. Le Gac, E. Aslanides, J. R. Fry, P. Bloch, G. S. Varner, P. Sanders, J.C. Dousse, T. Alhalel, Christopher Bee, Mats Danielsson, R. Adler, A. Haselden, Ioannis Evangelou, O. Wigger, R.W. Hollander, M. Chardalas, M.B. Chertok, K. Jon-And, P. Gumplinger, L. Sakeliou, A.J.P.L. Policarpo, L. Faravel, H.-J. Gerber, Jeffrey Boone Miller, Stef. Charalambous, Per Carlson, T. Nakada, W. Fetscher, J. K. Bienlein, K. Sarigiannis, E. Gabathuler, L. Sacks, R. Richkenbach, D.A. Troster, W.G. Heyes, C.W.E. van Eijk, G. Polivka, A. Go, H. Postma, Christer Fuglesang, R. Gamet, Nikolaos Manthos, P. Fassnacht, Sp. Dedoussis, Ch. Bula, M. Schafer, A. Liolios, Lukas A. Schaller, P. Pavlopoulos, F. Henry-Couannier, A. Soares, C. Touramanis, Marcin Wladyslaw Wolter, C. Witzig, P. Weber, J. Bennet, J. Derre, M. Fidecaro, P. F. Harrisch, F. Pelucchi, Frixos A Triantis, B. Eckart, A. Angelopoulos, J. Pinto da Cunha, D. Zimmerman, C. Thibault, O. Behnke, C. Kochowski, T. Lawry, M. Mikuž, D. Francis, T. Geralis, B. L. Roberts, Danilo Zavrtanik, B. Pagels, C. Eleftheriadis, A. Schopper, R. Ferreira-Marques, P. Maley, Andras Kerek, P.J. Hayman, Igor Mandić, Francois Touchard, A. Onofre, Panagiotis Kokkas, C. Felder, C. Yeche, V. Bertin, P.R. Kettle, L. Tauscher, G. Chardin, Jean-Louis Faure, E. Machado, D. Garreta, J. Kern, G. Backenstoss, R. Kreuger, A. Apostolakis, Andrej Filipcic, H.U. Johner, Claude Guyot, A. Cody, S. Vlachos, G. Marel, E. Cawley, J. Duclos, T. Ruf, K. Jansson, E. van Beveren, Marc Dejardin, E. Rozaki, M. Dodgson, Claudio Santoni, João Carvalho, F. Montanet, Ph. Schune, and A. Ealet
Subjects: Physics, Annihilation, Physics and Astronomy (miscellaneous), Hydrogen, Meson, Gaseous hydrogen, chemistry.chemical_element, Elementary particle, Nuclear physics, chemistry, Antiproton, Quantum field theory, Atomic physics, Engineering (miscellaneous)
Abstract: Antiproton annihilation at rest in gaseous hydrogen (16 bar pressure) to the final states ρ(770)X andf2(1270)X, whereX stands for one or more neutral mesons, has been studied at LEAR using the CPLEAR detector. Relative branching ratios are given forX =π0,2π0, 3π0 ω in the ρ case, and forX =π0, η in thef2 case. The annihilation channel$\bar pp \to \rho 3\pi ^0 $ has not been measured before. The fraction of P-wave annihilation is deduced from the ratiof2π0/ρπ0 to be 0.38±0.07, in good agreement with the result previously obtained by CPLEAR from the ratioK+K-/π+π-.
Published: 1995
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25. Bose-Einstein correlations in $$\bar p$$ p annihilations at rest

Author: P. Fassnacht, P. Sanders, A.J.P.L. Policarpo, Claudio Santoni, O. Behnke, K. Jon-And, A. Schopper, A. Haselden, P.J. Hayman, Jeffrey Boone Miller, M. Mikuž, D. Francis, L. Faravel, K. Sarigiannis, João Carvalho, F. Montanet, D. Zimmerman, C. Touramanis, E. van Beveren, R.W. Hollander, E. Rozaki, Christopher Bee, P. Weber, R. Gamet, B. Eckart, Frixos A Triantis, L. Tauscher, R. Le Gac, F. Touchard, Andras Kerek, E. Machado, L.A. Schaller, E. Aslanides, T. Nakada, L. Sacks, H. Postma, C. Fuglesang, T. Geralis, A. Apostolakis, J. Bennet, R. Kreuger, J. Duclos, T. Ruf, Igor Mandić, M. Dodgson, J. R. Fry, G. S. Varner, Danilo Zavrtanik, K. Jansson, A. Cody, Philippe Bloch, Ioannis Evangelou, P. Carlson, W. Fetscher, P. Gumplinger, L. Sakeliou, P. Maley, Sp. Dedoussis, S. Vlachos, C. Felder, D.A. Troster, C. Witzig, C. Yeche, M. Chardalas, G. Marel, F. Henry-Couannier, M.B. Chertok, M. Schafer, E. Cawley, C.W.E. van Eijk, P. Pavlopoulos, Marc Dejardin, V. Bertin, R. Ferreira-Marques, Mats Danielsson, R. Adler, P.F. Harrison, Ph. Schune, A. Ealet, C. Kochowski, B. Pagels, A. Go, Andrej Filipcic, H.U. Johner, Claude Guyot, A. Soares, C. Thibault, C. Eleftheriadis, G. Chardin, Jean-Louis Faure, D. Garreta, J. Kern, G. Backenstoss, Ch. Bula, M. Fidecaro, Panagiotis Kokkas, Stef. Charalambous, G. Polivka, P.-R. Kettle, Nikolaos Manthos, A. Liolios, Marcin Wladyslaw Wolter, J. Derre, F. Pelucchi, A. Angelopoulos, T. Lawry, E. Gabathuler, R. Rickenbach, J.C. Dousse, T. Alhalel, J. Pinto da Cunha, H.-J. Gerber, A. Onofre, W.G. Heyes, O. Wigger, J. K. Bienlein, and B.L. Roberts
Subjects: Physics, Nuclear physics, Correlation function (statistical mechanics), Particle physics, Pion, Physics and Astronomy (miscellaneous), Antiproton, Symmetrization, Elementary particle, Bose–Einstein correlations, Wave function, Engineering (miscellaneous), Exponential function
Abstract: Two-charged-pion correlations were studied in$\bar p$p(→2π*2π−nπ0,n≥0) annihilations at rest with the CPLEAR detector at the Low-Energy Antiproton Ring (LEAR). A strong enhancement was found in the production of pairs of like-sign pions with a small value of the relative fourmomentumQ, with respect to pairs of unlike-sign pions. The observed enhancement was interpreted as a consequence of the Bose-Einstein symmetrization of the two-pion wave function. The data are well represented by a correlation function parametrized as a double-Gaussian; an exponential parametrization is also statistically acceptable. The value of the correlation strength is found to be >1. The high-quality large data samples together with the ability for K± identification and final-state separation allowed the study of systematic effects impacting on theQ dependence of the correlation function and on the extracted space parameters of the pion sources.
Published: 1994
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26. Two pion Bose-Einstein correlations in p annihilations at rest

Author: G. Chardin, Jean-Louis Faure, D. Garreta, J. Kern, G. Backenstoss, C. Thibault, C. Eleftheriadis, Ch Yèche, Francois Touchard, B. Eckart, Stef. Charalambous, Christer Fuglesang, G. Polivka, J. Pinto da Cunha, H. Postma, K. Sarigiannis, Sp. Dedoussis, R. Le Gac, J. R. Fry, P. Gumplinger, Andras Kerek, J. Duclos, M. Dejardin, A. Go, Ph. Schune, M. Schafer, T. Ruf, M. Chardalas, A. Onofre, A. Soares, R. Kreuger, A. Ealet, Kerstin Jon-And, Christopher Bee, K. Jansson, Nikolaos Manthos, P. Pavlopoulos, Ioannis Evangelou, G. S. Varner, A. Liolios, A. Schopper, B.L. Roberts, P.J. Hayman, J.P. Miller, E. van Beveren, T. Nakada, R. Garnet, Ch. Bula, P.R. Kettle, L. Tauscher, C. Witzig, V. Bertin, W. Fetscher, E. Machado, O. Wigger, Elie Aslanides, J. K. Bienlein, M. Fidecaro, M. Van den Putte, A. Alhalel, J.C. Dousse, P. Fassnacht, S. Vlachos, O. Wolter, G. Marel, J. Bennet, E. Cawley, Marko Mikuz, A. Apostolakis, Mats Danielsson, D.A. Troester, H.-J. Gerber, R. Adler, Igor Mandić, Danilo Zavrtanik, E. Gabathuler, R. Rickenbach, D. Zimmerman, E. Rozaki, W.G. Heyes, C. Kochowski, P. Carlson, R. Ferreira-Marques, B. Pagels, David Francis, C.W.E. van Eijk, P. Sanders, S. Szilagyi, Theodoros Geralis, A. Angelopoulos, P.F. Harrison, A.J.P.L. Policarpo, P. Bloch, J. Derre, Panagiotis Kokkas, F. Pelucchi, P. Weber, C. Touramanis, R.W. Hollander, Frixos A Triantis, T. Lawry, L.A. Schaller, Claudio Santoni, Andrej Filipcic, H.U. Johner, João Carvalho, F. Montanet, Claude Guyot, C. Felder, M. Dodgson, P. Maley, L. Sakeliou, L. Faravel, and L. Sacks
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Pion, Large Hadron Collider, Nuclear Theory, Detector, High Energy Physics::Experiment, Bose–Einstein correlations, Multiplicity (chemistry), Nuclear Experiment
Abstract: Bose-Einstein (BE) correlations between like-sign charged pions were studied in pp annihilations at rest into four-prong events, using data taken with the CPLEAR detector at LEAR (CERN). A strong enhancement was found in the production of pairs of like-sign pions of similar momenta, with respect to the pairs of unlike-sign pions. The observed BE- enhancement was used to extract the values for the strength λ of the effect and the radius r of the pion emitting source. The extracted value of λ >l is of relevant importance and clearly does not depend on the assumed parametrization of the correlation function. The influence of the normalization and fitting procedure, the detector resolution, the resonances production and decay and the neutral-pion multiplicity cuts, on the size of the pion source and the strength of the effect was investigated.
Published: 1993
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27. Physics at CPLEAR

Author: Andrej Filipcic, M. Mikuž, D. Francis, A.J.P.L. Policarpo, P. Bloch, O. Behnke, P. Weber, F. Leimgruber, A. Schopper, M. Schafer, G. Polivka, P.J. Hayman, M. Fidecaro, R. Ferreira-Marques, P.-R. Kettle, P. Bargassa, A. Haselden, O. Wigger, A. Muller, E. Gabathuler, R. Rickenbach, R. Le Gac, P. Pavlopoulos, F. Blanc, Igor Mandić, T. Schietinger, E. Aslanides, Ch Yèche, A. Ealet, Danilo Zavrtanik, C. Thibault, C. Eleftheriadis, A. Go, J. R. Fry, B. Pagels, Marc Dejardin, C. Touramanis, H.-J. Gerber, Michael C. Carroll, T. Ruf, R. Gamet, I. Papadopoulos, L. Sakeliou, Panagiotis Kokkas, Jeffrey Boone Miller, Per Carlson, V. Bertin, R. Kreuger, D. Zimmerman, A. Apostolakis, G. Marel, Nikolaos Manthos, B. L. Roberts, W. Fetscher, A. Benelli, C.W.E. van Eijk, Marcin Wladyslaw Wolter, J. Derre, F. Henry-Couannier, G. Backenstoss, Sotirios Vlachos, A. Angelopoulos, R.W. Hollander, Mats Danielsson, M.B. Chertok, K. Jon-And, Lukas A. Schaller, C.P. Bee, T. Nakada, E. Cawley, F. Touchard, F. Montanet, L. Tauscher, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CPLEAR, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Damoiseaux, Magali
Subjects: Physics, Particle physics, Antiparticle, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, General relativity, Time evolution, General Physics and Astronomy, 01 natural sciences, Symmetry (physics), symbols.namesake, Antimatter, 0103 physical sciences, symbols, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], CP violation, EPR paradox, 010306 general physics, Coherence (physics)
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 , and 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. http://www.sciencedirect.com/science/article/B6TVP-47F7DN6-2/1/21e8338e47f0a67bf401b4882a11ceee
Published: 2003

28. Pion Correlations and Resonance Effects in ppbar Annihilation to 4pi0 at Rest

Author: P. Weber, O. Kortner, V.E. Markushin, M.P. Locher, and O. Wigger
Subjects: Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Resonance, FOS: Physical sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Pion, Pi, Invariant mass, High Energy Physics::Experiment, Invariant (mathematics), Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: We study pi0pi0 correlations in the exclusive reaction ppbar -> 4pi0 at rest with complete reconstruction of the kinematics for each event. The inclusive distribution shows a dip at small invariant mass of the pion pair while a small enhancement in the double differential distribution is observed for small invariant masses of both pion pairs. Dynamical models with resonances in the final state are shown to be consistent with the data while the stochastic HBT mechanism is not supported by the present findings., 17 pages, 12 figures
Published: 2002

29. STUDIES OF THE CP, T AND CPT SYMMETRIES IN THE NEUTRAL KAON SYSTEM

Author: G. Polivka, W. Fetscher, T. Nakada, C. Thibault, B. L. Roberts, G. Backenstoss, T. Ruf, Francois Touchard, L. Faravel, Marko Mikuz, Sotirios Vlachos, F. Henry-Couannier, F. Blanc, A. Angelopoulos, C. Eleftheriadis, Kerstin Jon-And, Nikolaos Manthos, Danilo Zavrtanik, A. Benelli, C.W.E. van Eijk, R. Le Gac, B. Pagels, M. Fidecaro, V. Bertin, Marcin Wladyslaw Wolter, R. Gamet, J. Derre, Lukas A. Schaller, Andrej Filipcic, A. Muller, M. Schafer, O. Wigger, J. R. Fry, A. Go, A. Apostolakis, E. Gabathuler, R. Kreuger, J. S. Miller, R. Rickenbach, David Francis, Ioannis Papadopoulos, O. Behnke, H.-J. Gerber, Elie Aslanides, Marc Dejardin, F. Leimgruber, A. Schopper, P.J. Hayman, P. Pavlopoulos, D. Zimmerman, Michael C. Carroll, C. Touramanis, P. Weber, P. Carlson, P. Bloch, Panagiotis Kokkas, F. Montanet, Igor Mandić, T. Schietinger, G. Marel, E. Cawley, Mats Danielsson, P.R. Kettle, L. Tauscher, P. Bargassa, A. Haselden, A. Ealet, R.W. Hollander, M.B. Chertok, Lorgeril, Jocelyne, M. Campbell, J.M. Qian, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CPLEAR, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Homogeneous space, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published: 2000
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30. Measurement of the energy dependence of the form factor f+ in K0e3 decay

Author: M. Schafer, M. Wolter, E. Gabathuler, R. Rickenbach, P. Weber, E. Cawley, S. Vlachos, R. Le Gac, P. Bloch, I. Mandić, J. R. Fry, T. Schietinger, M.B. Chertok, M. Mikuž, T. Ruf, F. Blanc, Marc Dejardin, D. Zimmerman, P. Carlson, G. Backenstoss, B. Pagels, T. Nakada, P. Kokkas, A. Apostolakis, F. Montanet, Michael C. Carroll, D. Zavrtanik, P. Pavlopoulos, I. Papadopoulos, K. Jon-And, G. Polivka, A. Haselden, L. Tauscher, Jeffrey Boone Miller, N. Manthos, R. Kreuger, M. Fidecaro, A. Ealet, A. Filipčič, R.W. Hollander, G. Marel, L.A. Schaller, O. Wigger, P. Bargassa, C. Thibault, Mats Danielsson, O. Behnke, C. Eleftheriadis, A. Go, F. Leimgruber, A. Schopper, P.J. Hayman, F. Touchard, W. Fetscher, F. Henry-Couannier, A. Muller, A. Benelli, H.-J. Gerber, C.W.E. van Eijk, C. Touramanis, J. Derre, Elie Aslanides, P.-R. Kettle, R. Gamet, D. Francis, B. L. Roberts, V. Bertin, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CPLEAR, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Electroweak interaction, Form factor (quantum field theory), Of the form, 01 natural sciences, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Particle Physics - Experiment, Energy (signal processing)
Abstract: Neutral-kaon decays to [pi]e[nu] were analysed to determine the q2 dependence of the K0e3 electroweak form factor f+. Based on 365 612 events, this form factor was found to have a linear dependence on q2 with a slope [lambda]+=0.0245±0.0012stat±0.0022syst. http://www.sciencedirect.com/science/article/B6TVN-414F7YB-Y/1/f9d5dd66c27d4f9264d1cec6fac93c68
Published: 2000

31. First direct observation of time-reversal violation

Author: R. Le Gac, J. R. Fry, H.-J. Gerber, P. Bloch, T. Nakada, F. Montanet, O. Behnke, C. Eleftheriadis, M.B. Chertok, E. Gabathuler, R. Rickenbach, F. Leimgruber, A. Schopper, Kerstin Jon-And, Nikolaos Manthos, P. Pavlopoulos, M. Mikuž, M. Fidecaro, A. Apostolakis, W. Fetscher, P.J. Hayman, R. Gamet, P. Weber, P. Bargassa, C. Touramanis, A. Muller, Ioannis Papadopoulos, T. Ruf, F. Henry-Couannier, P.R. Kettle, L. Tauscher, Marcin Wladyslaw Wolter, Lukas A. Schaller, J. Derre, Panagiotis Kokkas, G. Marel, F. Blanc, A. Go, E. Cawley, Mats Danielsson, O. Wigger, T. Schietinger, David Francis, Sotirios Vlachos, Elie Aslanides, J. S. Miller, A. Angelopoulos, B. Pagels, Marc Dejardin, A. Benelli, C.W.E. van Eijk, A. Haselden, A. Ealet, Igor Mandić, R.W. Hollander, Michael C. Carroll, R. Kreuger, D. Zimmerman, P. Carlson, Danilo Zavrtanik, V. Bertin, M. Schafer, G. Backenstoss, Andrej Filipcic, G. Polivka, C. Thibault, B. L. Roberts, and Francois Touchard
Subjects: Physics, Nuclear physics, Particle physics, Positron, Pion, media_common.quotation_subject, Charge (physics), Electron, Strangeness, Neutrino, Asymmetry, Lepton, media_common
Abstract: Using its unique capability of strangeness tagging at K0 production in pp→K∓π±K0(K0) and at decay with the lepton charge in semileptonic decays CPLEAR measured the semileptonic decay-rate asymmetry R(K0→e+π−ν)−R(K0→e−π+ν)R(K0→e+π−ν)+R(K0→e−π+ν). The asymmetry, fitted over the eigentime interval 1–20 τS, yielded a non-zero result of (6.6±1.3stat±1.1syst)×10−3. A thorough phenomenological anaylsis identifies T violation in K0 mixing and/or CPT violation in semileptonic decays as possible interpretations. A confrontation with world data on neutral kaon decays, however, excludes the latter with sufficient precision to establish the result as the first direct observation of time reversal non-invariance.
Published: 2000
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32. Pion correlations and resonance effects in $$\bar pp$$ annihilation at rest to 2π+2π-π0

Author: Marc Dejardin, C. Eleftheriadis, O. Wigger, A. Go, Panagiotis Kokkas, W. Fetscher, C. Thibault, B. L. Roberts, M.B. Chertok, Danilo Zavrtanik, T. Schietinger, R. Garnet, O. Behnke, K. Jon-And, F. Henry-Couannier, M. Schafer, A. Apostolakis, P. Bargassa, F. Leimgruber, A. Schopper, E. Cawley, E. Gabathuler, R. Rickenbach, Nikolaos Manthos, P. Pavlopoulos, Mats Danielsson, L. Farave, R. Kreuger, P.J. Hayman, M. Fidecaro, Jeffrey Boone Miller, G. Backenstoss, P.R. Kettle, L. Tauscher, D. Francis, H.-J. Gerber, Andrej Filipcic, I. Papadopoulos, L. Sakeliou, Igor Mandić, A. Haselden, T. Ruf, A. Muller, G. Polivka, G. Marel, Per Carlson, P. Bloch, F. Touchard, R.W. Hollander, A. Ealet, F. Blanc, V.E. Markushin, Marcin Wladyslaw Wolter, J. Derre, Michael C. Carroll, D. Zimmerman, B. Pagels, M.P. Locher, Sotirios Vlachos, R. Le Gac, J. R. Fry, P. Weber, F. Montanet, Marko Mikuz, A. Benelli, C.W.E. van Eijk, C. Touramanis, Lukas A. Schaller, T. Nakada, V. Bertin, and Elie Aslanides
Subjects: Nuclear physics, Physics, Particle physics, Annihilation, Pion, Physics and Astronomy (miscellaneous), Resonance, Dalitz plot, Invariant mass, State (functional analysis), Invariant (mathematics), Engineering (miscellaneous), Bar (unit)
Abstract: We study ππ correlations in the exclusive reaction $$\bar pp \to 2\pi ^ + 2\pi ^ - \pi ^0 $$ at rest with complete reconstruction of the kinematics for each event. Inclusive and differential distributions properly normalized show an enhancement for small invariant masses M ++,M -- of like-pion pairs. An even stronger enhancement is seen for the double differential distributions for low pion-pair masses. The signal is strongest when the π0 energy is large and much weaker when this energy is small. Dynamical models with resonances in the final state are confronted with the data. For the kinematic situation where the ρ3π channel is important the simulation predicts a large pion correlation for the double differential density, qualitatively explaining the observed bahaviour. The stochastic HBT mechanism is not supported by these findings for the exclusive annihilation reaction studied.
Published: 1999
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33. A determination of the CP violation parameter eta(+-) from the decay of strangeness-tagged neutral kaons

Author: T. Nakada, R. Le Gac, E. Aslanides, M. Wolter, T. Ruf, J. R. Fry, E. Cawley, C. Thibault, A. Haselden, A. Muller, V. Bertin, A. Ealet, R. Kreuger, R.W. Hollander, M. Schafer, H.-J. Gerber, F. Blanc, G. Polivka, A. Apostolakis, G. Marel, A. Go, Marc Dejardin, P. Weber, B. Pagels, S. Vlachos, C. Eleftheriadis, Michael C. Carroll, F. Touchard, P.-R. Kettle, D. Zavrtanik, P. Pavlopoulos, Jeffrey Boone Miller, L. Tauscher, W. Fetscher, N. Manthos, A. Filipčič, O. Wigger, O. Behnke, F. Leimgruber, A. Schopper, G. Backenstoss, P.J. Hayman, A. Benelli, Panagiotis Kokkas, C.W.E. van Eijk, Ch Yèche, F. Henry-Couannier, D. Francis, I. Papadopoulos, K. Jon-And, I. Mandić, R. Gamet, C. Touramanis, M. Fidecaro, D. Zimmerman, P. Carlson, L.A. Schaller, B.L. Roberts, L. Sakeliou, P. Bargassa, J. Derre, M. Mikuž, Mats Danielsson, T. Schietinger, M.B. Chertok, E. Gabathuler, R. Rickenbach, F. Montanet, and P. Bloch
Subjects: Physics, Nuclear and High Energy Physics, Antiparticle, Particle physics, cplear, General relativity, Time evolution, Strangeness, Symmetry (physics), Nuclear physics, Antimatter, CP violation, High Energy Physics::Experiment, Particle Physics - Experiment, Coherence (physics)
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.
Published: 1999

34. Measurement of the $K_{L}-K_{S}$ mass difference using semileptonic decays of tagged neutral kaons

Author: D. Garreta, M. Mikuž, F. Touchard, L. Tauscher, Marc Dejardin, L. Faravel, J. Derre, F. Pelucchi, A. Benelli, E. Machado, T. Schietinger, M. Chardalas, M.B. Chertok, R. Le Gac, Jeffrey Boone Miller, C. Felder, P. Weber, E. Aslanides, C. Touramanis, Christer Fuglesang, T. Lawry, Frixos A Triantis, K. Sarigiannis, Christopher Bee, H. Postma, A. Cody, Sp. Dedoussis, J. R. Fry, T. Geralis, P. Fassnacht, R. Ferreira-Marques, Panagiotis Kokkas, Claudio Santoni, G. S. Varner, Ch Yèche, F. Henry-Couannier, B. Eckart, C. Witzig, B.L. Roberts, I. Mandić, T. Nakada, G. Backenstoss, L. Sacks, I. Papadopoulos, E. Hubert, A. Filipčič, F. Blanc, A. Haselden, João Carvalho, K. Jon-And, D.A. Troster, O. Wigger, C. Kochowski, J. Duclos, Ch. Bula, T. Alhalel, B. Pagels, C.W.E. van Eijk, M. Dodgson, V. Bertin, M. Schafer, A. Go, D. Zimmerman, E. van Beveren, J. K. Bienlein, R.W. Hollander, W. Fetscher, T. Ruf, F. Montanet, R. Gamet, E. Rozaki, Ph. Schune, A. Soares, K. Jansson, O. Behnke, H.-J. Gerber, M. Fidecaro, W.G. Heyes, Mats Danielsson, R. Adler, F. Leimgruber, A. Schopper, S. Vlachos, P. Sanders, C. Thibault, P Harrison, M. Wolter, P.J. Hayman, P. Maley, A. Liolios, L.A. Schaller, J. Bennet, E. Cawley, Ioannis Evangelou, D. Francis, P. Gumplinger, L. Sakeliou, A.J.P.L. Policarpo, N. Manthos, E. Gabathuler, R. Rickenbach, P. Pavlopoulos, R. Kreuger, A. Apostolakis, G. Marel, A. Ealet, Michael C. Carroll, D. Zavrtanik, P. Bloch, H.U. Johner, Claude Guyot, P.-R. Kettle, C. Eleftheriadis, A. Angelopoulos, J. Pinto da Cunha, A. Onofre, P. Carlson, G. Chardin, Jean-Louis Faure, Stef. Charalambous, and G. Polivka
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Full data, Particle Physics - Experiment
Abstract: We report on a new measurement of the K L –K S mass difference Δm using the CPLEAR full data sample of neutral-kaon decays to e πν . The result is Δm =(0.5295±0.0020 stat ±0.0003 syst )×10 10 ℏ/s. It includes earlier data reported in R. Adler et al., CPLEAR Collaboration, Phys. Lett. B 363 (1995) 237. A measurement of the ΔS = ΔQ violating parameter Re( x ) is also obtained.
Published: 1998

35. Upper limit for the branching ratio of K[sub S]→e[sup +]e[sup −] decay

Author: J. Pinto da Cunha, C. Eleftheriadis, Mats Danielsson, W. Fetscher, F. Montanet, E. Machado, E. Hubert, A.J.P.L. Policarpo, A. Apostolakis, A. Benelli, C.W.E. van Eijk, P.R. Kettle, L. Tauscher, F. Henry-Couannier, D. Zimmerman, A. Muller, O. Behnke, J. S. Miller, P. Weber, P. Carlson, M. Mikuž, M.B. Chertok, R. Le Gac, C. Thibault, F. Leimgruber, João Carvalho, A. Schopper, B. L. Roberts, P. Pavlopoulos, Marc Dejardin, Elie Aslanides, P.J. Hayman, Andrej Filipcic, E. van Beveren, T. Nakada, F. Blanc, A. Go, Sotirios Vlachos, Marcin Wladyslaw Wolter, J. Derre, O. Wigger, B. Pagels, A. Soares, T. Ruf, C. Touramanis, A. Angelopoulos, J. R. Fry, A. Haselden, Michael C. Carroll, Francois Touchard, R. Gamet, Frixos A Triantis, Kerstin Jon-And, C. Yeche, A. Ealet, R. Kreuger, G. Chardin, Nikolaos Manthos, P. Bargassa, A. Liolios, R.W. Hollander, H.-J. Gerber, D. Garreta, G. Backenstoss, P. Bloch, Lukas A. Schaller, Ioannis Evangelou, David Francis, L. Sakeliou, Igor Mandić, G. Marel, E. Cawley, A. Cody, L. Faravel, Panagiotis Kokkas, T. Schietinger, R. Ferreira-Marques, Ioannis Papadopoulos, M. Fidecaro, Stef. Charalambous, G. Polivka, P. Sanders, Danilo Zavrtanik, V. Bertin, M. Schafer, E. Gabathuler, and R. Rickenbach
Subjects: Nuclear physics, Physics, Particle physics, Positron, Branching fraction, Detector, Electron, Limit (mathematics), Particle identification, Calorimeter, Event reconstruction
Abstract: A measurement of the branching ratio for KS→e+e− decay was performed with the CPLEAR detector at LEAR. Full event reconstruction together with calorimeter e/π separation allowed for powerful background rejection and high signal acceptance. The analysis on the complete set of data yields the result: BR(KS→e+e−)
Published: 1998
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36. CPLEAR results on the CP parameters of neutral kaons decaying to $\pi^+ \pi^- \pi^0$

Author: R. Le Gac, E. Aslanides, C. Touramanis, J. R. Fry, L. Tauscher, Frixos A Triantis, E. Machado, I. Papadopoulos, O. Behnke, L. Faravel, G. Backenstoss, Stef. Charalambous, G. Polivka, F. Leimgruber, A. Schopper, P.J. Hayman, M. Schafer, J. Pinto da Cunha, Igor Mandić, A. Benelli, C.W.E. van Eijk, E. Cawley, P. Weber, Nikolaos Manthos, Sotirios Vlachos, A. Go, Andrej Filipcic, A. Liolios, A. Angelopoulos, G. Chardin, P. Pavlopoulos, Claude Guyot, D. Garreta, P. Fassnacht, E. Hubert, P. Sanders, C. Felder, Mats Danielsson, R. Adler, Panagiotis Kokkas, A.J.P.L. Policarpo, V. Bertin, W. Fetscher, Marc Dejardin, T. Ruf, C. Thibault, H.-J. Gerber, O. Wigger, C. Eleftheriadis, Christopher Bee, Michael C. Carroll, M. Fidecaro, M. Mikuž, M.B. Chertok, Danilo Zavrtanik, D. Zimmerman, A. Cody, D. Francis, R. Kreuger, K. Jon-And, Marcin Wladyslaw Wolter, J. Derre, A. Apostolakis, F. Henry-Couannier, G. Marel, Claudio Santoni, T. Schietinger, Ioannis Evangelou, P. Bargassa, R. Gamet, Ch Yèche, B.L. Roberts, B. Eckart, L. Sakeliou, A. Haselden, P.-R. Kettle, João Carvalho, F. Montanet, R.W. Hollander, A. Muller, E. van Beveren, Ph. Schune, Per Carlson, A. Ealet, F. Touchard, R. Ferreira-Marques, T. Nakada, Lukas A. Schaller, A. Soares, F. Blanc, C. Kochowski, B. Pagels, Jeffrey Boone Miller, P. Bloch, E. Gabathuler, R. Rickenbach, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CPLEAR, Lorgeril, Jocelyne, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Complete data, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Branching fraction, Order (ring theory), 01 natural sciences, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], CP violation, 010306 general physics, Particle Physics - Experiment
Abstract: The CPLEAR experiment measured time-dependent decay-rate asymmetries of \PKz\ and \PaKz\ decaying to \pipmz\ in order to study the interference between the decay amplitudes of \PKzS\ --- either CP-violating or CP-conserving --- and the CP-conserving \PKzL\ decay amplitude. From the analysis of the complete data set we find for the CP-violating parameter \etapmz , % % $ \reeta = \left( -2 \pm 7 \mbox{\rm \ stat.\ } ^{+4}_{-1} \mbox{\rm \ syst.} \right) \times 10^{-3} , $ $ \imeta = \left( -2 \pm 9 \mbox{\rm \ stat.\ } ^{+2}_{-1} \mbox{\rm \ syst.} \right) \times 10^{-3} $ % % and for the CP-conserving parameter \lampmz , % % $ \relam = \left(+28 \pm 7 \mbox{\rm \ stat.\ } \pm 3 \mbox{\rm \ syst.} \right) \times 10^{-3} , $ $ \imlam = \left( -10 \pm 8 \mbox{\rm \ stat.\ } \pm 2 \mbox{\rm \ syst.} \right) \times 10^{-3}. $ % % From the latter, the branching ratio of the CP-conserving $\PKzS \rightarrow \pipmz $ decay is deduced to be % % $ \mathrm{B} = \left( 2.5 ^{+1.3}_{-1.0} \mathrm{\ stat.\ } ^{+0.5}_{-0.6} \mathrm{\ syst.\ } \right) \times 10^{-7}.
Published: 1997

37. CPLEAR experiment at CERN: Measurement of CP, T and CPT in the neutral kaon system

Author: B. Eckart, C. Touramanis, J. R. Fry, Jeffrey Boone Miller, F. Blanc, Mats Danielsson, Sotirios Vlachos, T. Ruf, R. Adler, Frixos A Triantis, C. Kochowski, B. Pagels, L. Faravel, A. Angelopoulos, M. Mikuž, Marc Dejardin, E. Gabathuler, R. Rickenbach, O. Wigger, J. Pinto da Cunha, A. Haselden, P. Bloch, A. Benelli, C.W.E. van Eijk, A.J.P.L. Policarpo, A. Ealet, W. Fetscher, R.W. Hollander, G. Chardin, A. Muller, P. Weber, M.B. Chertok, D. Garreta, Ph. Schune, G. Backenstoss, Patrick Fassnacht, Lukas A. Schaller, F. Henry-Couannier, Stef. Charalambous, Ioannis Evangelou, Ioannis Papadopoulos, O. Behnke, M. Fidecaro, G. Polivka, R. Gamet, F. Leimgruber, Michael C. Carroll, A. Schopper, P.J. Hayman, Igor Mandić, P. Pavlopoulos, David Francis, R. Kreuger, Elie Aslanides, Claudio Santoni, C. Thibault, T. Nakada, L. Sakeliou, B. L. Roberts, C. Eleftheriadis, T. Schietinger, C. Felder, João Carvalho, Francois Touchard, C. Yeche, R. Ferreira-Marques, Panagiotis Kokkas, P.R. Kettle, L. Tauscher, Andrej Filipcic, Claude Guyot, E. Hubert, Kerstin Jon-And, Nikolaos Manthos, D. Zimmerman, A. Liolios, P. Carlson, F. Montanet, Christopher Bee, A. Go, A. Soares, P. Sanders, E. Machado, P. Bargassa, Danilo Zavrtanik, V. Bertin, M. Schafer, A. Apostolakis, R. Le Gac, Marcin Wladyslaw Wolter, E. van Beveren, J. Derre, A. Cody, H.-J. Gerber, G. Marel, E. Cawley, Lorgeril, Jocelyne, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CPLEAR, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Semileptonic decay, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], CPT symmetry, Branching fraction, media_common.quotation_subject, Nuclear Theory, High Energy Physics::Phenomenology, Strangeness, 7. Clean energy, Asymmetry, Nuclear physics, Pion, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, media_common, Lepton
Abstract: Using strangeness tagging at production time, CPLEAR measures K0/K0 time-dependent asymmetries in pionic and semileptonic kaon decays. From those, a set of parameters describing CP, T and CPT violation in neutral kaon mixing and decay can be determined. Strangeness tagging at decay time with the lepton charge allows for time-reversal violation to be directly observed with a significance of more than three standard deviations. The precision on each of the CPT violation parameters is discussed. The mass equality of the K0 and K0 is tested within 4.×10−19 GeV.
Published: 1997
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38. First observation of a particle-antiparticle asymmetry in the decay of neutral kaons into $\pi^{0}\pi^{0}$

Author: L. Faravel, K. Sarigiannis, L. Sacks, Michael C. Carroll, V. Bertin, D.A. Troster, M. Schafer, J. Bennet, Panagiotis Kokkas, Igor Mandić, O. Behnke, F. Montanet, Christopher Bee, Jeffrey Boone Miller, Elie Aslanides, G. Marel, E. Cawley, P. Weber, Ch. Bula, J. Duclos, C. Thibault, T. Schietinger, M. Fidecaro, Patrick Fassnacht, T. Alhalel, F. Leimgruber, A. Schopper, T. Ruf, B. L. Roberts, P. Sanders, Marko Mikuz, J. Pinto da Cunha, P. Pavlopoulos, Ioannis Papadopoulos, K. Jansson, M. Dodgson, Lukas A. Schaller, W. Fetscher, P.R. Kettle, L. Tauscher, R. Kreuger, A. Benelli, C.W.E. van Eijk, Theodoros Geralis, E. Gabathuler, R. Rickenbach, Marc Dejardin, A. Apostolakis, G. S. Varner, R. Ferreira-Marques, P.J. Hayman, H.-J. Gerber, Francois Touchard, C. Touramanis, David Francis, Ph. Schune, Danilo Zavrtanik, A. Cody, Frixos A Triantis, Sotirios Vlachos, Sp. Dedoussis, C. Eleftheriadis, R. Gamet, A. Go, W.G. Heyes, T. Nakada, John R. Fry, A. Angelopoulos, F. Henry-Couannier, E. Rozaki, A. Soares, G. Chardin, Jean-Louis Faure, Christer Fuglesang, Claudio Santoni, A. Onofre, A.J.P.L. Policarpo, D. Garreta, G. Backenstoss, B. Eckart, João Carvalho, Stef. Charalambous, G. Polivka, C. Felder, R. Le Gac, Kerstin Jon-And, Nikolaos Manthos, C. Yeche, A. Liolios, Marcin Wladyslaw Wolter, O. Wigger, J. Derre, Eef van Beveren, T. Lawry, J. K. Bienlein, P. Bloch, A. Haselden, A. Ealet, R.W. Hollander, Mats Danielsson, R. Adler, M. Chardalas, M.B. Chertok, P. Maley, Ioannis Evangelou, P. Gumplinger, L. Sakeliou, E. Hubert, D. Zimmerman, P. Carlson, E. Machado, Paul Fraser Harrison, F. Blanc, C. Kochowski, Andrej Filipcic, H.U. Johner, B. Pagels, Claude Guyot, H. Postma, F. Pelucchi, and C. Witzig
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, media_common.quotation_subject, Hadron, Elementary particle, Strangeness, Asymmetry, Nuclear physics, Particle decay, Pion, CP violation, Particle Physics - Experiment, media_common
Abstract: CP violation has been observed as a time-dependent rate asymmetry between the decays ${⩈erline K}^0 ⌝ghtarrow ≪^{0} ≪^{0}$ and K0 → π0π{0}, where the neutral kaons are produced with definite and individually known strangeness in ${⋏r p}p ⌝ghtarrow{⩈erline K}^0 K^+≪^- $ or pp → K0 K− π+. A special technique for the data analysis has been developed. The values obtained for ϕ00 and ¦ η00¦ are in agreement with those of previous measurements of CP violation.
Published: 1995

39. Measurement of K$_{L}$-K$_{S}$ mass difference using semileptonic decays of tagged neutral kaons

Author: R. Adler, T. Alhalel, A. Angelopoulos, A. Apostolakis, E. Aslanides, G. Backenstoss, C.P. Bee, O. Behnke, A. Benelli, J. Bennet, V. Bertin, J.K. Bienlein, F. Blanc, P. Bloch, C. Bula, P. Carlson, M. Carroll, J. Carvalho, E. Cawley, S. Charalambous, M. Chardalas, G. Chardin, M.B. Chertok, A. Cody, M. Danielsson, S. Dedoussis, M. Dejardin, J. Derre, M. Dodgson, J. Duclos, A. Ealet, B. Eckart, C. Eleftheriadis, I. Evangelou, L. Faravel, P. Fassnacht, J.L. Faure, C. Felder, R. Ferreira-Marques, W. Fetscher, M. Fidecaro, A. Filipčič, D. Francis, J. Fry, C. Fuglesang, E. Gabathuler, R. Gamet, D. Garreta, T. Geralis, H.-J. Gerber, A. Go, P. Gumplinger, C. Guyot, P.F. Harrison, A. Haselden, P.J. Hayman, F. Henry-Couannier, W.G. Heyes, R.W. Hollander, E. Hubert, K. Jansson, H.U. Johner, K. Jon-And, P.-R. Kettle, C. Kochowski, P. Kokkas, R. Kreuger, T. Lawry, R. Le Gac, F. Leimgruber, A. Liolios, E. Machado, P. Maley, I. Mandić, N. Manthos, G. Marel, M. Mikuž, J. Miller, F. Montanet, T. Nakada, A. Onofre, B. Pagels, I. Papadopoulos, P. Pavlopoulos, F. Pelucchi, J. Pinto da Cunha, A. Policarpo, G. Polivka, H. Postma, R. Rickenbach, B.L. Roberts, E. Rozaki, T. Ruf, L. Sacks, L. Sakeliou, P. Sanders, C. Santoni, K. Sarigiannis, M. Schäfer, L.A. Schaller, T. Schietinger, A. Schopper, P. Schune, A. Soares, L. Tauscher, C. Thibault, F. Touchard, C. Touramanis, F. Triantis, D.A. Tröster, E. Van Beveren, C.W.E. Van Eijk, G. Varner, S. Vlachos, P. Weber, O. Wigger, C. Witzig, M. Wolter, C. Yeche, D. Zavrtanik, and D. Zimmerman
Subjects: Nuclear and High Energy Physics, Particle Physics - Experiment
Published: 1995

40. CP, T, and CPT tests in neutral Kaon decays using tagged K0, K0at LEAR

Author: L. Faravel, C.W.E. van Eijk, E. Hubert, K. Sarigiannis, T. Alhalel, O. Behnke, H.-J. Gerber, Danilo Zavrtanik, G. Marel, Sp. Dedoussis, Marcin Wladyslaw Wolter, J. Derre, F. Montanet, Christopher Bee, G. Chardin, Jean-Louis Faure, D. Zimmerman, T. Lawry, E. Cawley, V. Bertin, D.A. Troster, F. Leimgruber, R. Le Gac, P. Carlson, A. Schopper, E. van Beveren, F. Blanc, C. Kochowski, M. Mikuž, L. Sacks, D. Garreta, G. Backenstoss, M. Schafer, J. S. Miller, Ioannis Evangelou, B. Pagels, P.J. Hayman, Panagiotis Kokkas, P. Gumplinger, L. Sakeliou, E. Machado, Michael C. Carroll, Marc Dejardin, Stef. Charalambous, B. Eckart, J. R. Fry, H. Postma, Elie Aslanides, F. Pelucchi, J. Duclos, P.R. Kettle, L. Tauscher, G. Polivka, Patrick Fassnacht, Ch. Bula, C. Witzig, Ph. Schune, A. Onofre, Sotirios Vlachos, C. Touramanis, T. Ruf, R. Kreuger, Andrej Filipcic, P. Sanders, M. Fidecaro, A. Angelopoulos, W. Fetscher, Frixos A Triantis, T. Nakada, A. Go, K. Jansson, J. Pinto da Cunha, Kerstin Jon-And, Nikolaos Manthos, C. Thibault, A. Soares, B. L. Roberts, C. Eleftheriadis, C. Felder, A. Liolios, R. Gamet, H.U. Johner, Claudio Santoni, Claude Guyot, C. Yeche, T. Geralis, F. Henry-Couannier, Lukas A. Schaller, E. Rozaki, O. Wigger, Francois Touchard, J. Bennet, A.J.P.L. Policarpo, R. Ferreira-Marques, P. Weber, João Carvalho, David Francis, Igor Mandić, A. Cody, M. Dodgson, E. Gabathuler, R. Rickenbach, P. Maley, P. Pavlopoulos, A. Apostolakis, P. Bloch, A. Haselden, A. Ealet, R.W. Hollander, M. Chardalas, M.B. Chertok, Mats Danielsson, and R. Adler
Subjects: Nuclear physics, Physics, Particle physics, Large Hadron Collider, media_common.quotation_subject, Strangeness, Asymmetry, media_common
Abstract: The CPLEAR experiment at CERN measures particle‐antiparticle asymmetries of strangeness‐tagged K0, K0 decays to two‐pion, three‐pion, and semileptonic final states. The technique of CPLEAR is an alternative approach to previous CP‐violation studies. It provides complementary information with different systematics and gives access to novel measurements. The precision of the CP‐violation parameters η+− for π+π−, η+−0 for π+π−π0 and of the T‐violation parameter eT for π±e∓ν will be discussed for the data taken between 1990–1992.
Published: 1995
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41. A study of T violation via the semileptonic decays of neutral kaons in CPLEAR

Author: E. Gabathuler, Stef. Charalambous, R. Rickenbach, L. Tauscher, M. Mikuž, G. Polivka, P. Sanders, E. Machado, A.J.P.L. Policarpo, I. Evangelou, R. Ferreira-Marques, Panagiotis Kokkas, B. Eckart, S. Szilagyi, P.F. Harrison, E. Rozaki, Ph. Schune, P. Fassnacht, J. Bennet, C. Witzig, A. Ealet, A. Schopper, K. Sarigiannis, H. J. Johner, H. Postma, M. Van den Putte, Sp. Dedoussis, Andrej Filipcic, C. Thibault, A. Go, P. Bloch, T. Geralis, Danilo Zavrtanik, R. Gamet, C. Eleftheriadis, Elie Aslanides, A. Apostolakis, P.J. Hayman, Igor Mandić, R. Kreuger, L.A. Schaller, J. Duclos, B.L. Roberts, D. Zimmerman, Christopher Bee, P.-R. Kettle, Jeffrey Boone Miller, P. Carlson, Claude Guyot, Francois Touchard, V. Bertin, D.A. Troster, C. Felder, A. Soares, Mats Danielsson, R. Adler, Ch. Bula, T. Ruf, O. Wigger, C.W.E. van Eijk, Andras Kerek, M. Schafer, C. Yeche, J. Pinto da Cunha, G. Chardin, Jean-Louis Faure, W. Fetscher, K. Jansson, D. Garreta, J. Kern, C. Kochowski, J. K. Bienlein, G. Backenstoss, M. Fidecaro, J.C. Dousse, T. Alhalel, B. Pagels, C. Touramanis, M. Dejardin, Christer Fuglesang, Frixos A Triantis, E. van Beveren, R.W. Hollander, Kerstin Jon-And, P. Gumplinger, M. Chardalas, Nikolaos Manthos, R. Le Gac, H.-J. Gerber, A. Onofre, P. Pavlopoulos, A. Liolios, P. Maley, W.G. Heyes, A. Angelopoulos, Marcin Wladyslaw Wolter, J. Derre, F. Pelucchi, T. Lawry, S. Vlachos, G. Marel, E. Cawley, J. R. Fry, G. S. Varner, L. Sakeliou, L. Faravel, L. Sacks, P. Weber, Claudio Santoni, João Carvalho, F. Montanet, M. Dodgson, T. Nakada, David Francis, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CPLEAR, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], CP violation, 010306 general physics, 01 natural sciences
Abstract: The method for studying semileptonic neutral kaon decays at CPLEAR is presented together with a preliminary data analysis. For the first time a direct determination of T violation is shown to be possible and low statistics results are given. From the same data the K(L)-K(S) mass difference, DELTAm, the CP violation parameter of K(S), epsilon(S), and the parameter x testing the DELTAS = DELTAQ rule are also obtained. Nuclear Physics A
Published: 1992

42. Recent results on CP violation from the CPLEAR experiment

Author: E. Rozaki, E. Aslanides, L. Faravel, Marc Dejardin, P. Weber, Christer Fuglesang, J. Derre, Nikolaos Manthos, P Harrison, R. Le Gac, E. Machado, Ch Yèche, B. Eckart, J. Pinto da Cunha, M. Chardalas, A. Liolios, H. Postma, T. Nakada, J. Duclos, D. Zimmerman, L. Sacks, C. Bula, G. Burgun, T. Ruf, R. Ferreira-Marques, J. Bennet, E. Gabathuler, P. Maley, C. Guyot, A. Apostolakis, V. Bertin, P.-R. Kettle, G. Backenstoss, F. Pelucchi, K. Jansson, F. Montanet, H.U. Johner, P. Fassnacht, A. Schopper, P. Gumplinger, Andras Kerek, S. Szilagyi, T. Lawry, A. Onofre, P.J. Hayman, Ludwig Tauscher, C. Felder, D.A. Troester, Mats Danielsson, R. Adler, C. Witzig, W. Fetscher, J.C. Dousse, T. Alhalel, O. Wigger, Ioannis Evangelou, C.W.E. van Eijk, M. W. Wolter, Theodoros Geralis, L. Sakeliou, A. Go, H.-J. Gerber, J. K. Bienlein, F. Touchard, Per Carlson, C. Touramanis, E. Cawley, C. Kochowski, Philippe Bloch, Frixos A Triantis, W.G. Heyes, A. Ealet, B. Pagels, J. Kern, R.W. Hollander, S. Dedoussis, David Francis, Ph. Schune, K. Jon-And, M. Mikuz, I. Mandić, Jeffrey Boone Miller, Sotirios Vlachos, M. Schafer, R. Gamet, A. Angelopoulos, L.A. Schaller, R. Kreuger, Claudio Santoni, G. Marel, A. Filipčič, João Carvalho, Danilo Zavrtanik, P. Sanders, S. Charalambous, A.J.P.L. Policarpo, G. Varner, M. Dodgson, C. Thibault, C. Eleftheriadis, Jean-Louis Faure, D. Garreta, G. Polivka, R.L. Roberts, K. Sarigiannis, J. R. Fry, P. Pavlopoulos, M. Van den Putte, Christopher Bee, R. Rickenbach, M. Fidecaro, Panagiotis Kokkas, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Morales A., CPLEAR, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Antiparticle, Meson, 010308 nuclear & particles physics, Strangeness, 7. Clean energy, 01 natural sciences, Atomic and Molecular Physics, and Optics, Nuclear physics, Particle decay, Pair production, Pion, Antimatter, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], CP violation, High Energy Physics::Experiment, 010306 general physics
Abstract: The CPLEAR experiment is aiming at precise CP violation tests using initially pure K0- and K0BAR beams from the intense source provided by the annihilation of the LEAR pBAR-beam in hydrogen. The strangeness tagging efficiency and the systematic errors have been studied and found to be in agreement with the design specifications. The measurement of the differential time asymmetry of the pi+pi- decays allowed the direct observation of differences in the decay rates of particles and antiparticles.The CP violating parameters were determined as \eta+/-\ = (2.32 +/- 0.14) . 10(-3) and phi+/- = 42.3-degrees +/- 4.4-degrees. First results in the reconstruction and analysis of the neutral kaon decays into two neutral pions and the K(e)3 decay are presented. Nuclear Physics B
Published: 1992

43. A determination of the CPT violation parameter Re(δ)from the semileptonic decay of strangeness-tagged neutral kaons

Author: A. Angelopoulos, A. Apostolakis, E. Aslanides, G. Backenstoss, P. Bargassa, O. Behnke, A. Benelli, V. Bertin, F. Blanc, P. Bloch, P. Carlson, M. Carroll, E. Cawley, M.B. Chertok, M. Danielsson, M. Dejardin, J. Derre, A. Ealet, C. Eleftheriadis, L. Faravel, W. Fetscher, M. Fidecaro, A. Filipčič, D. Francis, J. Fry, E. Gabathuler, R. Gamet, H.-J. Gerber, A. Go, A. Haselden, P.J. Hayman, F. Henry-Couannier, R.W. Hollander, K. Jon-And, P.-R. Kettle, P. Kokkas, R. Kreuger, R. Le Gac, F. Leimgruber, I. Mandić, N. Manthos, G. Marel, M. Mikuž, J. Miller, F. Montanet, A. Muller, T. Nakada, B. Pagels, I. Papadopoulos, P. Pavlopoulos, G. Polivka, R. Rickenbach, B.L. Roberts, T. Ruf, M. Schäfer, L.A. Schaller, T. Schietinger, A. Schopper, L. Tauscher, C. Thibault, F. Touchard, C. Touramanis, C.W.E. Van Eijk, S. Vlachos, P. Weber, O. Wigger, M. Wolter, D. Zavrtanik, and D. Zimmerman
Subjects: Physics, Semileptonic decay, Nuclear physics, Nuclear and High Energy Physics, Decay time, Particle physics, Zero (complex analysis), High Energy Physics::Experiment, Production (computer science), Strangeness, Full sample, Particle Physics - Experiment, Order of magnitude
Abstract: We have improved by two orders of magnitude the limit currently available for the CPT violation parameter \red . To this purpose we have analyzed the full sample of neutral-kaon decays to \semi\ recorded in the CPLEAR experiment, where the strangeness of the neutral kaons was tagged at production and decay time. An appropriate function of the measured decay rates, including information from the analysis of \pip\pim\ decay channel, gives directly \red . The result $\red = (3.0 \pm 3.3_\mathrm{{stat}} \pm 0.6_\mathrm{{syst}}) \times 10^{-4}$ is compatible with zero. Values for the parameters $\imd$, $\rexm$ and $\imxp$ were also obtained.

44. Recent results of the CPLEAR experiment

Author: H. Postma, J.C. Dousse, T. Alhalel, H.-J. Gerber, W.G. Heyes, J. Duclos, B. Eckart, T. Ruf, K. Jansson, Marcin Wladyslaw Wolter, J. Derre, F. Pelucchi, T. Lawry, B.L. Roberts, Kerstin Jon-And, Nikolaos Manthos, A. Liolios, Jeffrey Boone Miller, P. Weber, R. Ferreira-Marques, S. Szilagyi, L. Sakeliou, P.F. Harrison, M. Chardalas, P. Gumplinger, Lukas A. Schaller, G. Chardin, Jean-Louis Faure, A. Go, J. Pinto da Cunha, Andras Kerek, P. Sanders, M. Van den Putte, D. Garreta, J. Kern, P. Bloch, Marko Mikuz, Ch. Bula, G. Backenstoss, Christopher Bee, P. Fassnacht, M. Dejardin, A. Apostolakis, A. Soares, W. Fetscher, P.J. Hayman, M. Fidecaro, A.J.P.L. Policarpo, David Francis, C.W.E. van Eijk, D. Zimmerman, P. Carlson, O. Wigger, Theodoros Geralis, A. Onofre, E. Gabathuler, E. Rozaki, R. Rickenbach, R. Kreuger, Christer Fuglesang, C. Touramanis, R. Gamet, R. Le Gac, Frixos A Triantis, V. Bertin, D.A. Troster, C. Witzig, J. R. Fry, R.W. Hollander, Panagiotis Kokkas, T. Nakada, G. S. Varner, J.K. Bielein, K. Sarigiannis, G. Marel, E. Cawley, J. Bennet, Elie Aslanides, Igor Mandić, Mats Danielsson, R. Adler, C. Thibault, P. Pavlopoulos, A. Angelopoulos, A. Schopper, C. Kochowski, C. Eleftheriadis, B. Pagels, S. Vlachos, Francois Touchard, E. van Beveren, Stef. Charalambous, Ph. Schune, A. Ealet, G. Polivka, L. Faravel, L. Sacks, M. Schafer, Claudio Santoni, Andrej Filipcic, João Carvalho, F. Montanet, I. Evangelou, H.U. Johner, Claude Guyot, P. Maley, P.R. Kettle, L. Tauscher, Danilo Zavrtanik, E. Machado, Sp. Dedoussis, M. Dodgson, C. Felder, C. Yeche, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CPLEAR, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, 0103 physical sciences, Measure (physics), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, 01 natural sciences
Abstract: The CPLEAR experiment at CERN has been designed to measure CP and T violating effects in the neutral kaon system by observing particle-antiparticle asymmetries. The motivation and the physics program of CPLEAR is presented and first analyses of the K0,K0BAR to pi+pi-, pi0pi0 and pi+pi-pi0 decays are discussed. Special emphasis is given to the recent results of the measurement of the CP violating parameters phi+- and eta+- based on first data taken in 1990/1991. Nuclear Physics A

45. Measurement of the neutral kaon regeneration amplitude in carbon at momenta below 1 GeV/c

Author: A. Haselden, R. Le Gac, L. Faravel, R. Ferreira-Marques, T. Nakada, G. Chardin, J. R. Fry, Ch Yèche, R.W. Hollander, G. Backenstoss, F. Blanc, B. Pagels, Jeffrey Boone Miller, J. Pinto da Cunha, Nikolaos Manthos, C. Thibault, M.B. Chertok, Marc Dejardin, D. Garreta, A. Liolios, C. Eleftheriadis, R. Gamet, K. Jon-And, P.-R. Kettle, Stef. Charalambous, Andrej Filipcic, Lukas A. Schaller, G. Polivka, A. Muller, W. Fetscher, A. Apostolakis, M. Mikuž, I. Papadopoulos, E. Hubert, Danilo Zavrtanik, D. Francis, P. Weber, Mats Danielsson, A. Ealet, João Carvalho, F. Montanet, F. Henry-Couannier, L. Tauscher, D. Zimmerman, P. Bargassa, B.L. Roberts, Ioannis Evangelou, A. Go, A. Soares, L. Sakeliou, E. Machado, Per Carlson, Sotirios Vlachos, O. Wigger, A. Angelopoulos, O. Behnke, F. Leimgruber, A. Schopper, P.J. Hayman, Marcin Wladyslaw Wolter, J. Derre, H.-J. Gerber, R. Kreuger, G. Marel, Igor Mandić, P. Pavlopoulos, Michael C. Carroll, T. Schietinger, T. Ruf, M. Schafer, E. Gabathuler, R. Rickenbach, Panagiotis Kokkas, P. Sanders, V. Bertin, Elie Aslanides, A. Benelli, C.W.E. van Eijk, C. Touramanis, Frixos A Triantis, A.J.P.L. Policarpo, E. van Beveren, F. Touchard, M. Fidecaro, P. Bloch, A. Cody, and E. Cawley
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Amplitude, chemistry, Nuclear Theory, chemistry.chemical_element, Interference (wave propagation), Nuclear Experiment, Carbon, Particle Physics - Experiment
Abstract: The neutral kaon regeneration amplitude in carbon at momenta between 250 and 750 MeV/c was determined by measuring the interference of inherent and coherently regenerated K-S amplitudes. This interference appears in the rates of initially pure (tagged) K-0 and (K) over bar(0) decaying to pi(+)pi(-) after crossing a carbon absorber. (C) 1997 Published by Elsevier Science B.V. Physics Letters B

46. Reply to La Via and colleagues.

Author: Berger D, Wigger O, Bachmann KF, and Bloechlinger S
Published: 2023
Full Text: View/download PDF

47. The effects of positive end-expiratory pressure on cardiac function: a comparative echocardiography-conductance catheter study.

Author: Berger D, Wigger O, de Marchi S, Grübler MR, Bloch A, Kurmann R, Stalder O, Bachmann KF, and Bloechlinger S
Subjects: Catheters, Diastole, Echocardiography, Humans, Heart Ventricles, Positive-Pressure Respiration
Abstract: Background: Echocardiographic parameters of diastolic function depend on cardiac loading conditions, which are altered by positive pressure ventilation. The direct effects of positive end-expiratory pressure (PEEP) on cardiac diastolic function are unknown., Methods: Twenty-five patients without apparent diastolic dysfunction undergoing coronary angiography were ventilated noninvasively at PEEPs of 0, 5, and 10 cmH 2 O (in randomized order). Echocardiographic diastolic assessment and pressure-volume-loop analysis from conductance catheters were compared. The time constant for pressure decay (τ) was modeled with exponential decay. End-diastolic and end-systolic pressure volume relationships (EDPVRs and ESPVRs, respectively) from temporary caval occlusion were analyzed with generalized linear mixed-effects and linear mixed models. Transmural pressures were calculated using esophageal balloons., Results: τ values for intracavitary cardiac pressure increased with the PEEP (n = 25; no PEEP, 44 ± 5 ms; 5 cmH 2 O PEEP, 46 ± 6 ms; 10 cmH 2 O PEEP, 45 ± 6 ms; p < 0.001). This increase disappeared when corrected for transmural pressure and diastole length. The transmural EDPVR was unaffected by PEEP. The ESPVR increased slightly with PEEP. Echocardiographic mitral inflow parameters and tissue Doppler values decreased with PEEP [peak E wave (n = 25): no PEEP, 0.76 ± 0.13 m/s; 5 cmH 2 O PEEP, 0.74 ± 0.14 m/s; 10 cmH 2 O PEEP, 0.68 ± 0.13 m/s; p = 0.016; peak A wave (n = 24): no PEEP, 0.74 ± 0.12 m/s; 5 cmH 2 O PEEP, 0.7 ± 0.11 m/s; 10 cmH 2 O PEEP, 0.67 ± 0.15 m/s; p = 0.014; E' septal (n = 24): no PEEP, 0.085 ± 0.016 m/s; 5 cmH 2 O PEEP, 0.08 ± 0.013 m/s; 10 cmH 2 O PEEP, 0.075 ± 0.012 m/s; p = 0.002]., Conclusions: PEEP does not affect active diastolic relaxation or passive ventricular filling properties. Dynamic echocardiographic filling parameters may reflect changing loading conditions rather than intrinsic diastolic function. PEEP may have slight positive inotropic effects., Clinical Trial Registration: https://clinicaltrials.gov/ct2/show/NCT02267291 , registered 17. October 2014., (© 2022. The Author(s).)
Published: 2022
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48. [CME: Heart Failure- Overview, Clinical Manifestation, Diagnosis and Management].

Author: Kerov A, Meier A, Wigger O, and Linka A
Subjects: Biomarkers, Hospitalization, Humans, Peptide Fragments, Switzerland, Heart Failure diagnosis, Heart Failure etiology, Heart Failure therapy, Natriuretic Peptide, Brain
Abstract: CME: Heart Failure- Overview, Clinical Manifestation, Diagnosis and Management Abstract. Heart failure is one of the most common diseases in internal medicine with estimated more than 10 million patients in Europe. Another 10 million people suffer from myocardial insufficiency without symptoms. Along with injuries and pathologies of the musculoskeletal system, heart failure is one of the most common causes for hospitalization also in Switzerland. This article provides a brief overview of this common disease. Diagnostic tools as well as therapy options will be discussed.
Published: 2022
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49. [Pharmacological therapy of heart failure with reduced ejection fraction].

Author: Wieser M, Rhyner D, Martinelli M, Suter T, Schnegg B, Bösch C, Wigger O, Dobner S, and Hunziker L
Subjects: Adrenergic beta-Antagonists adverse effects, Aminobutyrates adverse effects, Aminobutyrates therapeutic use, Angiotensin Receptor Antagonists adverse effects, Angiotensin-Converting Enzyme Inhibitors adverse effects, Benzazepines adverse effects, Benzazepines therapeutic use, Biphenyl Compounds, Cardiac Output, Low diagnosis, Cardiac Output, Low mortality, Combined Modality Therapy, Diuretics adverse effects, Diuretics therapeutic use, Drug Combinations, Drug Therapy, Combination, Heart Failure diagnosis, Heart Failure mortality, Humans, Ivabradine, Life Style, Mineralocorticoid Receptor Antagonists adverse effects, Mineralocorticoid Receptor Antagonists therapeutic use, Tetrazoles adverse effects, Tetrazoles therapeutic use, Valsartan adverse effects, Valsartan therapeutic use, Adrenergic beta-Antagonists therapeutic use, Angiotensin Receptor Antagonists therapeutic use, Angiotensin-Converting Enzyme Inhibitors therapeutic use, Cardiac Output, Low drug therapy, Heart Failure drug therapy, Stroke Volume drug effects
Abstract: Pharmacological therapy of heart failure with reduced ejection fraction Abstract. Pharmacological therapy for heart failure has made great progress over the last three decades and evidence-based therapies have significantly improved survival and quality of life. Angiotensin-converting enzyme inhibitors or angiotensin receptor blockers and beta-blockers are the cornerstone of the heart failure therapy; indicated in virtually every patient with heart failure and reduced ejection fraction. As soon as the left ventricular ejection fraction decreases below 35 % and / or symptoms are still present (NYHA II-IV), a mineralocorticoid receptor antagonist should be added. A rather recent addition to current heart failure therapy with convincing data is the substance combination sacubitril / valsartan. It is indicated for patients with persistent symptomatic heart failure despite optimal medical therapy with ACE inhibitors or ARBs, beta-blockers, and MRAs. Crucial for all mentioned substances is to aim for the maximal tolerated dose. Various additional therapies have no proven survival benefit but are important for symptom control in everyday life. Above all the diuretics, where loop diuretics show a better effect profile compared to thiazide diuretics. Furthermore, achieving an optimal iron status (the limit to start a substitution is significantly higher than in patients without heart failure), decreasing the heart frequency with Ivabradine (if heart rate persists above 70 / min despite fully dosed betablocker) and «lifestyle changes» can add to the success of the medical treatment. The importance of digoxin has been steadily decreasing. The previously advocated therapeutic anticoagulation in patients with severely reduced LVEF is not propagated anymore. Significant arrhythmias (especially atrial fibrillation and ventricular arrhythmias) are common in advanced diseases. In addition to beta-blockers, amiodarone is clearly the antiarrhythmic drug of choice. According to latest data, an early interventional treatment of atrial fibrillation by pulmonary vein ablation may be beneficial and has the potential to reduce mortality in special subgroups of patients. New developments in the field of antidiabetic drugs seem to be promising for reduction of mortality and hospitalization in patients with heart failure.
Published: 2018
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50. Baseline serum bicarbonate levels independently predict short-term mortality in critically ill patients with ischaemic cardiogenic shock.

Author: Wigger O, Bloechlinger S, Berger D, Häner J, Zanchin T, Windecker S, Räber L, and Schefold JC
Subjects: Biomarkers blood, Cause of Death trends, Female, Hospital Mortality trends, Humans, Intensive Care Units, Male, Middle Aged, Myocardial Infarction blood, Myocardial Infarction mortality, Predictive Value of Tests, Retrospective Studies, Risk Factors, Shock, Cardiogenic blood, Survival Rate trends, Time Factors, Bicarbonates blood, Critical Illness, Myocardial Infarction complications, Shock, Cardiogenic mortality
Abstract: Background: Cardiogenic shock is a feared complication of acute myocardial infarction with high mortality rates. Data on the predictive role of acid base dysregulation in this clinical setting are sparse. We therefore embarked on investigating the predictive role of serum bicarbonate in critically ill intensive care unit (ICU) patients with cardiogenic shock., Methods: A total of 165 ischaemic cardiogenic shock patients (118 men, aged 68.4 years (interquartile range 59.0-77.4), APACHE II score 26.0 (interquartile range 21.0-29.0), after percutaneous coronary intervention were included in a single-centre analysis. Percutaneous coronary intervention-related data such as left ventricular ejection fraction and laboratory indices were recorded and routine clinical follow-up was obtained at hospital discharge and at one year. All-cause mortality was assessed and data were analysed using univariate and multivariate models., Results: All-cause mortality was highest (17%) during the first 48 hours following ICU admission (28-day mortality rate 43%). In a multiple regression model, age (hazard ratio (HR) 1.035, 95% confidence interval (CI) 1.011-1.059, P=0.004), APACHE II score (HR 1.036, 95% CI 1.002-1.072, P=0.037) and baseline serum bicarbonate levels (HR 0.93, 95% CI 0.866-0.998, P=0.046) independently predicted 28-day mortality (overall model fit χ 2 22.9, P<0.0001). The HR for patients in the lowest baseline serum bicarbonate tertile for 365-day mortality was HR 2.06 (95% CI 1.20-3.53)., Conclusions: In a large cohort of consecutive cardiogenic shock patients hospitalised in the ICU, low serum bicarbonate levels at admission independently predicted mortality. Given the widespread availability of blood gas analysers in ICUs, we propose baseline serum bicarbonate levels as an additional biomarker for identification and stratification of cardiogenic shock patients at risk.
Published: 2018
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