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1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

11. Failure forces of different interspinous vertebropexy techniques.

Author

Widmer J, Schuler A, Calek AK, Beretta-Piccoli A, Wigger O, Graf R, Kiener L, Rohner R, Fasser MR, and Farshad M

Abstract

Background Context: Challenges of vertebropexy such as spinous process fractures and tendon pull-out under high flexion loads need to be further investigated to ensure long-term stability of the construct., Purpose: Vertebropexy is a technique using a tendon as a posterior tension band to stabilize vertebral segments. Failure modes include pull-out or spinous process fractures under high flexion loads. This study simulates physiological risk loads in a biomechanical test to compare different interspinous vertebropexy techniques STUDY DESIGN: : Biomechanical cadaveric study., Methods: EIGHTEEN VERTEBRAL SEGMENTS WERE STABILIZED USING BOVINE FLEXOR TENDONS WITH THREE METHODS: "Tunnel only" (twice through spinous process holes), "Tunnel + cortical wrapping" (once through holes, once around spinous processes), and "Cortical wrapping only" (twice around spinous processes). Segments were subjected to cyclic, load-controlled flexion until failure. Force differences, bone failure modes, and the impact of bone quality on spinous process resistance were evaluated and compared., Results: The "Cortical wrapping only" technique achieved the highest mean torque (25.8 Nm), significantly outperforming the "Tunnel only" technique (13.4 Nm; p=0.024). The "Tunnel + cortical wrapping" technique (18.1 Nm) showed no significant difference from either "Tunnel only" or "Cortical wrapping only" (p=0.700; p=0.190). Bone failure modes, such as tendon cutting into bone and spinous process fractures, were consistent across technique. Bone density influenced failure resistance only in techniques involving cortical wrapping., Conclusions: The "Cortical wrapping only" method doubled the failure loads compared to the "Tunnel only" method while avoiding common failure modes like spinous process fractures. Additionally, bone density is a crucial factor to consider when using cortical bone as an abutment for the vertebropexy loop., Clinical Significance: This study proposes alternative vertebropexy techniques to enhance spinal stabilization and minimize failure risks., Competing Interests: Declaration of competing interest The first author (JW) reports being a Stock owner of Moving Spine (Balgrist University Startup). The last author (MF) reports being a Board member of IDKD and Swiss Orthopaedics, Consultant for Medacta, Arthrex, Medacta, Zurimed, President of the Board and Stock owner of MovingSpine (Balgrist University Startup) and shareholder of Balgrist University Startups (MovingSpine and X23D). All the other authors report no conflicts of interest., (Copyright © 2025. Published by Elsevier Inc.)

Published
2025
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13. 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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14. 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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15. Basic concepts of heart-lung interactions during mechanical ventilation.

Author

Grübler MR, Wigger O, Berger D, and Blöchlinger S

Subjects
Blood Pressure physiology, Heart Rate, Hemodynamics, Humans, Respiration, Artificial adverse effects, Respiration, Artificial instrumentation, Cardiovascular System physiopathology, Heart physiopathology, Lung physiopathology, Respiration, Artificial methods
Abstract

Critically ill patients with the need for mechanical ventilation show complex interactions between respiratory and cardiovascular physiology. These interactions are important as they may guide the clinician's therapeutic decisions and, possibly, affect patient outcome. The aim of the present review is to provide the practicing physician with an overview of the concepts of heart-lung interactions during mechanical ventilation. We outline the basic cardiac and respiratory physiology during spontaneous breathing and under mechanical ventilation. The main focus is on the interaction between positive pressure ventilation and its effects on right and left ventricular pre- and afterload and ventricular interdependence. Further we discuss different modalities to assess volume responsiveness, such as pulse pressure variation. We aim to familiarise the reader with cardiovascular side effects of mechanical ventilation when experiencing weaning problems or right heart failure.

Published
2017
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16. Nonbacterial thrombotic endocarditis presenting as intracerebral hemorrhage.

Author

Wigger O, Windecker S, and Bloechlinger S

Subjects
Aged, Diagnosis, Differential, Humans, Intracranial Thrombosis etiology, Lung Neoplasms diagnosis, Male, Cerebral Hemorrhage diagnosis, Cerebral Hemorrhage etiology, Endocarditis complications, Endocarditis diagnosis, Intracranial Thrombosis diagnosis, Lung Neoplasms complications
Abstract

Nonbacterial thrombotic endocarditis is a rare cause of valvular heart disease, most commonly associated with advanced malignancy. The morbidity of this kind of endocarditis lies in its tendency to embolize, while the valve function is usually preserved. The central nervous system is the most common site of embolization, leading to ischemic stroke. We report a case of nonbacterial thrombotic endocarditis complicated by intracerebral hemorrhage as the first manifestation of adenocarcinoma of the lung. The endocarditis led to severe aortic regurgitation. In view of the advanced stage of lung cancer, the patient refused further therapy. He passed away 3 weeks after first diagnosis of the adenocarcinoma.

Published
2016
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17. Cardiac perforation as a rare complication of acupuncture.

Author

Wigger O, Stortecky S, Most H, and Englberger L

Subjects
Angina Pectoris etiology, Dyspnea etiology, Echocardiography, Female, Foreign Bodies diagnostic imaging, Heart Injuries diagnostic imaging, Humans, Middle Aged, Multimodal Imaging, Needles adverse effects, Tomography, X-Ray Computed, Acupuncture Therapy adverse effects, Foreign Bodies complications, Heart Injuries etiology, Heart Ventricles
Published
2016
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18. Usefulness of a clinical diagnosis of ICU-acquired paresis to predict outcome in patients with SIRS and acute respiratory failure.

Author

Brunello AG, Haenggi M, Wigger O, Porta F, Takala J, and Jakob SM

Subjects
Acute Disease, Aged, Female, Hospitalization statistics & numerical data, Humans, Male, Prospective Studies, Respiration, Artificial, Respiratory Distress Syndrome rehabilitation, Severity of Illness Index, Systemic Inflammatory Response Syndrome rehabilitation, Treatment Outcome, Ventilator Weaning, Iatrogenic Disease, Intensive Care Units statistics & numerical data, Paresis diagnosis, Paresis epidemiology, Respiratory Distress Syndrome therapy, Respiratory Insufficiency epidemiology, Systemic Inflammatory Response Syndrome epidemiology
Abstract

Purpose: Neuromuscular abnormalities are common in ICU patients. We aimed to assess the incidence of clinically diagnosed ICU-acquired paresis (ICUAP) and its impact on outcome., Methods: Forty-two patients with systemic inflammatory response syndrome on mechanical ventilation for >or=48 h were prospectively studied. Diagnosis of ICUAP was defined as symmetric limb muscle weakness in at least two muscle groups at ICU discharge without other explanation. The threshold Medical Research Council (MRC) Score was set at 35 (of 50) points. Activities in daily living were scored using the Barthel Index 28 and 180 days after ICU discharge., Results: Three patients died before sedation was stopped. ICUAP was diagnosed in 13 of the 39 patients (33%). Multivariate regression analysis yielded five ICUAP-predicting variables (P < 0.05): SAPS II at ICU admission, treatment with steroids, muscle relaxants or norepinephrine, and days with sepsis. Patients with ICUAP had lower admission SAPS II scores [37 +/- 13 vs. 49 +/- 15 (P = 0.018)], lower Barthel Index at 28 days and lower survival at 180 days after ICU discharge (38 vs. 77%, P = 0.033) than patients without ICUAP. Daily TISS-28 scores were similar but cumulative TISS-28 scores were higher in patients with ICUAP (664 +/- 275) than in patients without ICUAP (417 +/- 236; P = 0.008). The only independent risk factor for death before day 180 was the presence of ICUAP., Conclusions: A clinical diagnosis of ICUAP was frequently established in this patient group. Despite lower SAPS II scores, these patients needed more resources and had high mortality and prolonged recovery periods after ICU discharge.

Published
2010
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