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1. Physics at CPLEAR

Author

Angelopoulos, A. Apostolakis, A. Aslanides, E. Backenstoss, G. Bargassa, P. Bee, C.P. Behnke, O. Benelli, A. Bertin, V. Blanc, F. Bloch, P. Carlson, P. Carroll, M. Cawley, E. Chertok, M.B. Danielsson, M. Dejardin, M. Derre, J. Ealet, A. Eleftheriadis, C. Ferreira-Marques, R. Fetscher, W. Fidecaro, M. Filipčič, A. Francis, D. Fry, J. Gabathuler, E. Gamet, R. Gerber, H.-J. Go, A. Haselden, A. Hayman, P.J. Henry-Couannier, F. Hollander, R.W. Jon-And, K. Kettle, P.-R. Kokkas, P. Kreuger, R. Le Gac, R. Leimgruber, F. Mandić, I. Manthos, N. Marel, G. Mikuž, M. Miller, J. Montanet, F. Muller, A. Nakada, T. Pagels, B. Papadopoulos, I. Pavlopoulos, P. Policarpio, A. Polivka, G. Rickenbach, R. Roberts, B.L. Ruf, T. Sakeliou, L. Schäfer, M. Schaller, L.A. Schietinger, T. Schopper, A. Tauscher, L. Thibault, C. Touchard, F. Touramanis, C. Van Eijk, C.W.E. Vlachos, S. Weber, P. Wigger, O. Wolter, M. Yèche, C. Zavrtanik, D. Zimmerman, D.

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. © 2002 Elsevier Science B.V. All rights reserved.

Published
2003

2. K0 ⇋ K̄0 transitions monitored by strong interactions: A new determination of the KL-KS mass difference

Author

Angelopoulos, A. Aslanides, E. Backenstoss, G. Bargassa, P. Behnke, O. Benelli, A. Bertin, V. Blanc, F. Bloch, P. Carlson, P. Carroll, M. Cawley, E. Chertok, M.B. Danielsson, M. Dejardin, M. Derre, J. Ealet, A. Eleftheriadis, C. Fetscher, W. Fidecaro, M. Filipčič, A. Francis, D. Fry, J. Gabathuler, E. Gamet, R. Gerber, H.-J. Go, A. Haselden, A. Hayman, P.J. Henry-Couannier, F. Hollander, R.W. Jon-And, K. Kettle, P.-R. Kokkas, P. Kreuger, R. Le Gac, R. Leimgruber, F. Mandi, I. Manthos, N. Marel, G. Mikuž, M. Miller, J. Montanet, F. Muller, A. Nakada, T. Pagels, B. Papadopoulos, I. Pavlopoulos, P. Polivka, G. Rickenbach, R. Roberts, B.L. Ruf, T. Sakeliou, L. Schäfer, M. Schaller, L.A. Schietinger, T. Schopper, A. Tauscher, L. Thibault, C. Touchard, F. Touramanis, C. Van Eijk, C.W.E. Vlachos, S. Weber, P. Wigger, O. Wolter, M. Zavrtanik, D. Zimmerman, D.

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) × 1010h/s, provides a valuable input for CPT tests. © 2001 Published by Elsevier Science B.V.

Published
2001

3. T-violation and CPT-invariance measurements in the CPLEAR experiment: a detailed description of the analysis of neutral-kaon decays to e pi nu

Author

Angelopoulos, A., Aslanides, E., Backenstoss, G., Bargassa, P., Behnke, O., Benelli, A., Bertin, V., Blanc, F., Bloch, P., Carlson, P., Carroll, M., Cawley, E., Chertok, M.B., Danielsson, M., Dejardin, M., Derre, J., Ealet, A., Eleftheriadis, C., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Gabathuler, E., Gamet, R., Gerber, H.J., Go, A., Haselden, A., Hayman, P.J., Henry-Couannier, F., Hollander, R.W., Jon-And, K., Kettle, P.R., Kokkas, P., Kreuger, R., Le Gac, R., Leimgruber, F., Mandic, I., Manthos, N., Marel, G., Mikuz, M., Miller, J., Montanet, F., Müller, A., Nakada, T., Pagels, B., Papadopoulos, I., Pavlopoulos, P., Polivka, G., Rickenbach, R., Roberts, B.L., Ruf, T., Sakeliou, L., Schafer, M., Schaller, L.A., Schietinger, T., Schopper, A., Tauscher, L., Thibault, C., Touchard, F., Touramanis, C., Van Eijk, C.W.E., Vlachos, S., Weber, P., Wigger, O., Wolter, M., Zavrtanik, D., Zimmerman, D., 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), 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, and 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)

Subjects
[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
2001

4. A detailed description of the analysis of the decay of neutral kaons to π+π- in the CPLEAR experiment

Author

Apostolakis, A. Aslanides, E. Backenstoss, G. Bargassa, P. Behnke, O. Benelli, A. Bertin, V. Blanc, F. Bloch, P. Carlson, P. Carroll, M. Cawley, E. Chertok, M.B. Danielsson, M. Dejardin, M. Derre, J. Ealet, A. Eleftheriadis, C. Fetscher, W. Fidecaro, M. Filipčič, A. Francis, D. Fry, J. Gabathuler, E. Gamet, R. Gerber, H.-J. Go, A. Haselden, A. Hayman, P.J. Henry-Couannier, F. Hollander, R.W. Jon-And, K. Kettle, P.-R. Kokkas, P. Kreuger, R. Le Gac, R. Leimgruber, F. Mandić, I. Manthos, N. Marel, G. Mikuž, M. Miller, J. Montanet, F. Muller, A. Nakada, T. Pagels, B. Papadopoulos, I. Pavlopoulos, P. Polivka, G. Rickenbach, R. Roberts, B.L. Ruf, T. Sakeliou, L. Schäfer, M. Schaller, L.A. Schietinger, T. Schopper, A. Tauscher, L. Thibault, C. Touchard, F. Touramanis, C. Van Eijk, C.W.E. Vlachos, S. Weber, P. Wigger, O. Wolter, M. Yeche, C. Zavrtanik, D. Zimmerman, D.

Subjects
High Energy Physics::Experiment
Abstract

A detailed description is given of the analysis of neutral kaons decaying to π+π-, based on the complete set of data collected with the CPLEAR experiment. Using a novel approach involving initially strangeness-tagged K0 and K̄0, the time-dependent decay-rate asymmetry has been measured. This asymmetry, resulting from the interference between the KS and KL decay amplitudes, has enabled both the magnitude and phase of the CP-violation parameter, η+-, to be measured, with a precision comparable to that of the current world-average values.

Published
2000

5. A determination of the CP violation parameter $\eta_{\pm}$ from the decay of strangeness-tagged neutral kaons

Author

Apostolakis, A., Aslanides, E., Backenstoss, G., Bargassa, P., Behnke, O., Benelli, A., Bertin, V., Blanc, F., Bloch, P., Carlson, P., Carroll, M., Cawley, E., Chertok, M.B., Danielsson, M., Dejardin, M., Derre, J., Ealet, A., Eleftheriadis, C., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Gabathuler, E., Gamet, R., Gerber, H.J., Go, A., Haselden, A., Hayman, P.J., Henry-Couannier, F., Hollander, R.W., Jon-And, K., Kettle, P.R., Kokkas, P., Kreuger, R., Le Gac, R., Leimgruber, F., Mandic, I., Manthos, N., Marel, G., Mikuz, M., Miller, J., Montanet, F., Müller, A., Nakada, T., Pagels, B., Papadopoulos, I., Pavlopoulos, P., Polivka, G., Rickenbach, R., Roberts, B.L., Ruf, T., Sakeliou, L., Schafer, M., Schaller, L.A., Schietinger, T., Schopper, A., Tauscher, L., Thibault, C., Touchard, F., Touramanis, C., van Eijk, C.W.E., Vlachos, S., Weber, P., Wigger, O., Wolter, M., Yeche, C., Zavrtanik, D., Zimmerman, D., 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), 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, and 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)

Subjects
[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1999

6. Pion correlations and resonance effects in $\bar pp$ annihilation at rest to $2\pi^+ 2\pi^- \pi^0$

Author

Apostolakis, A., Aslanides, E., Backenstoss, G., Bargassa, P., Behnke, O., Benelli, A., Bertin, V., Blanc, F., Bloch, P., Carlson, P., Carroll, M., Cawley, E., Chertok, M.B., Danielsson, M., Dejardin, M., Derre, J., Ealet, A., Eleftheriadis, C., Faravel, L., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Gabathuler, E., Gamet, R., Gerber, H.J., Go, A., Haselden, A., Hayman, P.J., Henry-Couannier, F., Hollander, R.W., Jon-And, K., Kettle, P.R., Kokkas, P., Kreuger, R., Le Gac, R., Leimgruber, F., Mandic, I., Manthos, N., Marel, G., Mikuz, M., Miller, J., Montanet, F., Müller, A., Nakada, T., Pagels, B., Papadopoulos, I., Pavlopoulos, P., Polivka, G., Rickenbach, R., Roberts, B.L., Ruf, T., Sakeliou, L., Schafer, M., Schaller, L.A., Schietinger, T., Schopper, A., Tauscher, L., Thibault, C., Touchard, F., Touramanis, C., Van Eijk, C.W.E., Vlachos, S., Weber, P., Wigger, O., Wolter, M., Zavrtanik, D., Zimmerman, D., Locher, M.P., Markushin, V.E., 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, and 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)

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1999

7. Test of CPT Symmetry and Quantum Mechanics with Experimental data from CPLEAR

Author

Adler, R., Angelopoulos, A., Apostolakis, A., Aslanides, E., Backenstoss, G., Bee, C.P., Behnke, O., Benelli, A., Bertin, V., Blanc, F., Bloch, P., Carlson, P., Carroll, M., Carvalho, J., Cawley, E., Charalambous, S., Chardin, G., Chertok, M.B., Cody, A., Danielsson, M., Dejardin, M., Derre, J., Ealet, A., Eckart, B., Eleftheriadis, C., Evangelou, I., Faravel, L., Fassnacht, P., Felder, C., Ferreira-Marques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, John R., Gabathuler, E., Gamet, R., Garreta, D., Geralis, T., Gerber, H.J., Go, A., Guyot, C., Haselden, A., Hayman, P.J., Henry-Couannier, Frederic, Hollander, R.W., Hubert, E., Jon-And, Kerstin B., Kettle, P.R., Kochowski, C., Kokkas, P., Kreuger, R., Le Gac, R., Leimgruber, F., Liolios, A., Machado, E., Mandic, I., Manthos, N., Marel, G., Mikuz, M., Miller, J., Montanet, F., Nakada, T., Pagels, B., Papadopoulos, I., Pavlopoulos, P., Pinto da Cunha, J., Policarpo, A., Polivka, G., Rickenbach, R., Roberts, B.L., Ruf, T., Sakeliou, L., Sanders, P., Santoni, C., Schafer, M., Schaller, L.A., Schietinger, T., Schopper, A., Schune, P., Soares, A., Tauscher, L., Thibault, C., Touchard, F., Touramanis, C., Triantis, F., van Beveren, Eef, Van Eijk, C.W.E., Varner, Gary Sim, Vlachos, S., Weber, P., Wigger, O., Wolter, M., Yeche, C., Zavrtanik, D., Zimmerman, D., Ellis, John R., Lopez, J.L., Mavromatos, N.E., Nanopoulos, Dimitri V., 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, High Energy Physics - Theory, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, CPT symmetry, High Energy Physics::Phenomenology, Experimental data, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), High Energy Physics - Theory (hep-th), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Quantum gravity, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment
Abstract

We use fits to recent published CPLEAR data on neutral kaon decays to $\pi^+\pi^-$ and $\pi e\nu$ to constrain the CPT--violation parameters appearing in a formulation of the neutral kaon system as an open quantum-mechanical system. The obtained upper limits of the CPT--violation parameters are approaching the range suggested by certain ideas concerning quantum gravity., Comment: 9 pages of uuencoded postscript (includes 3 figures)

Published
1995
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8. Inclusive measurement of Mathematical expression annihilation at rest in gaseous hydrogen to final states containing ρ and f2

Author

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

Abstract

Antiproton annihilation at rest in gaseous hydrogen (16 bar pressure) to the final states ρ(770)X and f2(1270)X, where X stands for one or more neutral mesons, has been studied at LEAR using the CPLEAR detector. Relative branching ratios are given for X =π0,2 π0, 3 π0 ω in the ρ case, and for X =π0, η in the f2 case. The annihilation channel Mathematical expression has not been measured before. The fraction of P-wave annihilation is deduced from the ratio f2π0/ρπ0 to be 0.38±0.07, in good agreement with the result previously obtained by CPLEAR from the ratio K+K-/π+π-. © 1995 Springer-Verlag.

Published
1995

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