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Your search keyword '"Eijk, C. W. E."' showing total 13 results
Start Over Author "Eijk, C. W. E." Topic high energy physics::experiment
13 results on '"Eijk, C. W. E."'

1. Contribution of CPLEAR to the physics of the neutral-kaon system

Author

Pavlopoulos, P, Adler, R, Alhalel, T, Angelopoulos, Angelos, Apostolakis, Alcibiades J, Aslanides, Elie, Backenstoss, Gerhard, Bee, C P, Behnke, O, Benelli, A, Bertin, V, Blanc, F, Bloch, P, Carlson, P J, Carroll, M, Carvalho, J, Cawley, E, Charalambous, S, Chardin, G, Chertok, M B, Cody, A, Danielsson, M, Dejardin, M, Derré, J, Ealet, A, Eckart, B, Eleftheriadis, C, Evangelou, I, Faravel, L, Fassnacht, P, Felder, C, Ferreira-Marques, R, Fetscher, W, Fidecaro, Maria, Filipcic, A, Francis, D, Fry, J, Gabathuler, Erwin, Gamet, R, Garreta, D, Gerber, H J, Go, A, Guyot, C, Haselden, A, Hayman, P J, Henry-Coüannier, F, Hollander, R W, Hubert, E, Jon-And, K, Kettle, P R, Kochowski, Claude, Kokkas, P, Kreuger, R, Le Gac, R, Leimgruber, F, Liolios, A, Machado, E, Mandic, I, Manthos, N, Marel, Gérard, Mikuz, M, Miller, J, Montanet, François, Nakada, Tatsuya, Pagels, B, Papadopoulos, I M, Pinto da Cunha, J, Policarpo, Armando, Polivka, G, Rickenbach, R, Roberts, B L, Ruf, T, Sakelliou, L, Sanders, M P, Santoni, C, Schäfer, M, Schaller, L A, Schietinger, T, Schopper, A, Schune, P, Tauscher, Ludwig, Thibault, C, Touchard, F, Touramanis, C, Triantis, F A, Van Beveren, E, van Eijk, C W E, Vlachos, S, Weber, P, Wigger, O, Wolter, M, Yéche, C, Zavrtanik, D, and Zimmerman, D

Subjects
s mass difference, k-0, Physics, cp-violation, Nuclear and High Energy Physics, Particle physics, CPT symmetry, Direct method, semileptonic decays, High Energy Physics::Phenomenology, violation parameter eta(+-), Nuclear physics, tagged (k)over-bar(0), CP violation, High Energy Physics::Experiment, Limit (mathematics), Particle Physics - Experiment
Abstract

We report the results of the CPLEAR experiment on CP-, T-, and CPT-symmetries in the neutral kaon system. CP-violation parameters are given for the K-0, (K) over bar(0) --> 2 pi, 3 pi decay channels. For the first time, T-violation is measured by a direct method using semileptonic decays. The CPT symmetry is tested through the parameters Im(delta) with a precision of 10(-5) and Re(delta) with a precision of a few 10(-4). With these two measurements, the difference in mass and width of K-0 and (K) over bar(0) are bound to within 10(-18) GeV. In the limit of CPT invariance in the neutral kaon decays, the K-0 and (K) over bar(0) masses are equal within 10(-19) GeV. Nuclear Physics A

Published
1999
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2. The neutral kaon decays to $\pi^+ \pi^- \pi^0$ : a detailed analysis of the CPLEAR data

Author

Angelopoulos, Angelos, Apostolakis, Alcibiades J, Aslanides, Elie, Backenstoss, Gerhard, Bargassa, P, Behnke, O, Benelli, A, Bertin, V, Blanc, F, Bloch, P, Carlson, P J, Carroll, M, Cawley, E, Chertok, M B, Danielsson, M, Dejardin, M, Derré, J, Ealet, A, Eleftheriadis, C, Faravel, L, Fassnacht, P, Fetscher, W, Fidecaro, Maria, Filipcic, A, Francis, D, Fry, J, Gabathuler, Erwin, Gamet, R, Gerber, H J, Go, A, Haselden, A, Hayman, P J, Henry-Coüannier, F, Hollander, R W, Jon-And, K, Kettle, P R, Kokkas, P, Kreuger, R, Le Gac, R, Leimgruber, F, Mandic, I, Manthos, N, Marel, Gérard, Mikuz, M, Miller, J, Montanet, François, Nakada, Tatsuya, Pagels, B, Papadopoulos, I M, Pavlopoulos, P, Polivka, G, Rickenbach, R, Roberts, B L, Ruf, T, Schäfer, M, Schaller, L A, Schietinger, T, Schopper, A, Tauscher, Ludwig, Thibault, C, Touchard, F, Touramanis, C, van Eijk, C W E, Vlachos, S, Weber, P, Wigger, O, Wolter, M, Zavrtanik, D, and Zimmerman, D

Subjects
Physics, Particle physics, Chiral perturbation theory, Physics and Astronomy (miscellaneous), Branching fraction, High Energy Physics::Phenomenology, Dalitz plot, Lambda, Amplitude, Isospin, CP violation, High Energy Physics::Experiment, Engineering (miscellaneous), Particle Physics - Experiment, Energy (signal processing)
Abstract

A detailed analysis of neutral kaons decaying to \(\pi^{+}\pi^{-}\pi^{0}\) is presented based on the complete data set containing half a million events. Time-dependent decay rate asymmetries are measured between initially tagged \({\mathrm{{K}\mbox{}^0}}\) and \({\mathrm{\overline{K}\mbox{}^0}}\) and for different regions of the phase space. These asymmetries, resulting from the interference between the CP-conserving decay amplitude of \({\mathrm{K_L}}\) and the decay amplitude of \({\mathrm{K_S}}\)– either CP-violating or CP-conserving – allow the determination of the \({\mathrm{K_S}}\) parameters \(\eta_{+-0}\) (CP-violating) and \(\lambda\) (CP-conserving), and also of the main isospin components of the \({\mathrm{K_S}}\) decay amplitude. The branching ratio of \({\mathrm{K_S}}\rightarrow \pi^{+}\pi^{-}\pi^{0}\) (CP-conserving) is deduced directly from \(\lambda\). In addition, we extract the slope parameters describing the energy dependence of the \({\mathrm{K_L}} \rightarrow \pi^{+}\pi^{-}\pi^{0}\) Dalitz plot. The whole set of our results fits well within the current phenomenological picture of the neutral-kaon system including CP violation and Chiral Perturbation Theory (ChPT).

Published
1998
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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, Angelos, Aslanides, Elie, Backenstoss, Gerhard, Bargassa, P, Behnke, O, Benelli, A, Bertin, V, Blanc, F, Bloch, P, Carlson, P J, Carroll, M, Cawley, E, Chertok, M B, Danielsson, M, Dejardin, M, Derré, J, Ealet, A, Eleftheriadis, C, Fetscher, W, Fidecaro, Maria, Filipcic, A, Francis, D, Fry, J, Gabathuler, Erwin, Gamet, R, Gerber, H J, Go, A, Haselden, A, Hayman, P J, Henry-Coüannier, F, Hollander, R W, Jon-And, K, Kettle, P R, Kokkas, P, Kreuger, R, Le Gac, R, Leimgruber, F, Mandic, I, Manthos, N, Marel, Gérard, Mikuz, M, Miller, J, Montanet, François, Müller, A, Nakada, Tatsuya, Pagels, B, Papadopoulos, I M, Pavlopoulos, P, Polivka, G, Rickenbach, R, Roberts, B L, Ruf, T, Sakelliou, L, Schäfer, M, Schaller, L A, Schietinger, T, Schopper, A, Tauscher, Ludwig, Thibault, C, Touchard, F, Touramanis, C, van Eijk, C W E, Vlachos, S, Weber, P, Wigger, O, Wolter, M, Zavrtanik, D, and Zimmerman, D

Subjects
High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

A detailed description of the analysis of neutral kaons decaying to \pen\ is given, based on the complete set of data collected with the CPLEAR experiment. Using a novel approach involving initially strangeness-tagged \kn\ and \knb , time-dependent decay-rate asymmetries were measured. These asymmetries enabled \Tz - and \CPTz -violation parameters to be measured in the context of a systematic study. The highlights of this study are the first direct observation of \Tz\ violation and the direct determination of the \CPTz\ parameter \red\ with an accuracy improved by two orders of magnitude with respect to the current value.

Published
2001

4. $K^{0} \leftrightharpoons \overline{K}^0$ transitions monitored by strong interactions: a new determination of the $K_{L} - K_{S}$ mass difference

Author

Angelopoulos, Angelos, Aslanides, Elie, Backenstoss, Gerhard, Bargassa, P, Behnke, O, Benelli, A, Bertin, V, Blanc, F, Bloch, P, Carlson, P J, Carroll, M, Cawley, E, Chertok, M B, Danielsson, M, Dejardin, M, Derré, J, Ealet, A, Eleftheriadis, C, Fetscher, W, Fidecaro, Maria, Filipcic, A, Francis, D, Fry, J, Gabathuler, Erwin, Gamet, R, Gerber, H J, Go, A, Haselden, A, Haymen, P J, Henry-Coüannier, F, Hollander, R W, Jon-And, K, Kettle, P R, Kokkas, P, Kreuger, R, Le Gac, R, Leimgruber, F, Mandic, I, Manthos, N, Marel, Gérard, Mikuz, M, Miller, J, Montanet, François, Müller, A, Nakada, Tatsuya, Pagels, B, Papadopoulos, I M, Pavlopoulos, P, Polivka, G, Rickenbach, R, Roberts, B L, Ruf, T, Sakelliou, L, Schäfer, M, Schaller, L A, Schietinger, T, Schopper, A, Tauscher, Ludwig, Thibault, C, Touchard, F, Touramanis, C, van Eijk, C W E, Vlachos, S, Weber, P, Wigger, O, Wolter, M, Zavrtanik, D, and Zimmerman, D

Subjects
High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract

The CPLEAR set-up (modified) has been used to determine the K/sub L/- K/sub S/ 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, Delta m= (0.5343+or-0.0063/sub stat/+or-0.0025/sub syst/)*10/sup 10/ h(cross) /s, provides a valuable input for CPT tests. (22 refs).

Published
2001

5. CP, T and CPT at CPLEAR

Author

Filipcic, Andrej, Angelopoulos, A, 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, Marsel, G, Mikuz, M, Miller, J, Montanet, F, Muller, A, Nakada, T, Pagels, B, Papadopoulos, I, Pavlopoulos, P, Polivka, G, Rickenbach, R, Roberts, B L, Ruf, T, 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, and Zimmerman, D

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

Using strangeness tagging at production time, CPLEAR measures time-dependent decay rate asymmetries between $K^0$ and $\bar{K}^0$, for picnic and semileptonic decays. Parameters describing CP, T, and CPT violation can be obtained with high precision. In the semileptonic channels neutral kaons are strangeness tagged also at the decay time, by the lepton charge, thus allowing the difference between the transition rates of $\bar{K}^0 \to K^0$ and $K^0 \to \bar{K}^0$ to be measured. In this way CPLEAR obtains the first direct measurement of T violation. By fitting the semileptonic rates under the constraint of the unitarity relation, we prove that in the reported measurement T violation is not mocked by CPT-violation effects in the decay amplitudes. Other CPLEAR measurements, only in part reported here, contribute to the experimental accuracy of the unitarity relation.

Published
2001

6. A detailed description of the analysis of the decay of neutral kaons to $\pi^+ \pi^-$ 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., 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., Sakelliou, 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., 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, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, media_common.quotation_subject, 01 natural sciences, Asymmetry, Amplitude, 0103 physical sciences, Pi, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], CP violation, High Energy Physics::Experiment, 010306 general physics, Engineering (miscellaneous), Particle Physics - Experiment, media_common
Abstract

A detailed description is given of the analysis of neutral kaons decaying to \({\mathrm{\pi^+\pi^-}}\), based on the complete set of data collected with the CPLEAR experiment. Using a novel approach involving initially strangeness-tagged \({\mathrm{K^0}}\) and \({\mathrm{\overline{K}^0}}\), the time-dependent decay-rate asymmetry has been measured. This asymmetry, resulting from the interference between the \({\mathrm{K_S}}\) and \({\mathrm{K_L}}\) decay amplitudes, has enabled both the magnitude and phase of the CP-violation parameter, \(\eta_{+-}\), to be measured, with a precision comparable to that of the current world-average values.

Published
2000

7. $K^{0}-\overline{K}^{0}$ mass and decay-width differences: CPLEAR evaluation

Author

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

Subjects
High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

The CPT-violation parameters \redd\ and \imd\ determined recently by CPLEAR are used to evaluate the \kn --\knb\ mass and decay-width differences, as given by the difference between the diagonal elements of the neutral-kaon mixing matrix $({\mathrm M}-\i\Gamma/2)$. The results --- $({\mathrm M}_{\kn\kn}-{\mathrm M}_{\knb\knb}) = ( -1.5 \pm 2.0 )\times10^{-18}$ \gev\ and $(\Gamma_{\kn\kn}-\Gamma_{\knb\knb}) = ( 3.9 \pm 4.2 )\times 10^{-18}$ \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

8. Tests of the Equivalence Principle with 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., Chardin, G., Chertok, M. B., Danielsson, M., Dejardin, M., Derre, J., Ealet, A., Eleftheriadis, C., Faravel, L., 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., Eijk, C. W. E., Vlachos, S., Weber, P., Wigger, O., Marcin Wolter, Zavrtanik, D., Zimmerman, D., Ellis, J., Mavromatos, N. E., Nanopoulos, D. 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, Nuclear and High Energy Physics, Antiparticle, Particle physics, 010308 nuclear & particles physics, Scalar (mathematics), FOS: Physical sciences, Observable, Function (mathematics), Coupling (probability), 01 natural sciences, High Energy Physics - Experiment, Gravitation, Gravitational potential, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Tensor, 010306 general physics, Particle Physics - Experiment
Abstract

We test the Principle of Equivalence for particles and antiparticles, using CPLEAR data on tagged K0 and K0bar decays into pi^+ pi^-. For the first time, we search for possible annual, monthly and diurnal modulations of the observables |eta_{+-}| and phi_{+-}, that could be correlated with variations in astrophysical potentials. Within the accuracy of CPLEAR, the measured values of |eta_{+-}| and phi_{+-} are found not to be correlated with changes of the gravitational potential. We analyze data assuming effective scalar, vector and tensor interactions, and we conclude that the Principle of Equivalence between particles and antiparticles holds to a level of 6.5, 4.3 and 1.8 x 10^{-9}, respectively, for scalar, vector and tensor potentials originating from the Sun with a range much greater than the distance Earth-Sun. We also study energy-dependent effects that might arise from vector or tensor interactions. Finally, we compile upper limits on the gravitational coupling difference between K0 and K0bar as a function of the scalar, vector and tensor interaction range., 15 pages latex 2e, five figures, one style file (cernart.csl) incorporated

Published
1999

9. A determination of the CPT violation parameter Re($\delta$) from the semileptonic decay of strangeness-tagged neutral kaons

Author

Angelopoulos, A., 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., Nakada, T., Pagels, B., Papadopoulos, I., Pavlopoulos, P., Polivka, G., Rickenbach, R., Roberts, B L., Ruf, T., Schdfer, M., Schaller, L A., Schietinger, T., Schopper, A., Tauscher, L., Thibault, C., Touchard, F., Touramanis, C., Van Eijk, C W E., Vlachos, S., Wigger, O., Wolter, M., Zavrtanik, D., Zimmerman, D., 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], High Energy Physics::Experiment
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.

Published
1998

10. First direct observation of time-reversal non-invariance in the neutral-kaon system

Author

Angelopoulos, A., 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., 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., Nakada, T., Pagels, B., Papadopoulos, I., Pavlopoulos, P., Polivka, G., Rickenbach, R., Roberts, B L., Ruf, T., Santoni, C., Schdfer, M., Schaller, L A., Schietinger, T., Tauscher, L., Thibault, C., Touchard, F., Touramanis, C., Van Eijk, C W E., Vlachos, S., Wigger, O., Wolter, M., Zavrtanik, D., Zimmerman, D., 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
[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Theory, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment
Abstract

We report on the first observation of time-reversal symmetry violation through a comparison of the probabilities of $\knb$ transforming into $\kn$ and $\kn$ into $\knb$ 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 $\ppb \rightarrow \mathrm{K}^{\pm} \pi^{\mp} \kn(\knb)$ at rest, whereas the strangeness of the kaon at the decay time $t=\tau$ was tagged by

Published
1998

11. CP, T, and CPT violation in the neutral kaon system at the CPLEAR experiment

Author

Adler, R, Alhalel, T, Angelopoulos, Angelos, Aslanides, Elie, Backenstoss, Gerhard, Bee, C P, Behnke, O, Bennet, J, Bertin, V, Blanc, F, Bloch, P, Bula, C, Carlson, P J, Carroll, M, Carvalho, J, Cawley, E, Charalambous, S, Chardalas, M, Chardin, G, Chertok, M B, Cody, A, Danielsson, M, Dedoussis, S, Dejardin, M, Derré, J, Dodgson, M, 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, Maria, Filipcic, A, Francis, D, Fry, J, Gabathuler, Erwin, Gamet, R, Garreta, D, Geralis, T, Gerber, H J, Gumplinger, P, Go, A, Guyot, C, Haselden, A, Hayman, P J, Henry-Coüannier, F, Hollander, R W, Hubert, E, Jansson, K, Johner, H U, Jon-And, K, Kettle, P R, Kochowski, Claude, Kokkas, P, Kreuger, R, Lawry, T, Le Gac, R, Leimgruber, F, Liolios, A, Machado, E, Maley, P, Mandic, I, Manthos, N, Marel, Gérard, Mikuz, M, Miller, J, Montanet, François, Nakada, Tatsuya, Onofre, A, Pagels, B, Pavlopoulos, P, Pelucchi, F, Pinto da Cunha, J, Policarpo, Armando, Polivka, G, Postma, H, Rickenbach, R, Roberts, B L, Rozaki, E, Ruf, T, Sacks, L, Sakelliou, L, Sanders, P, Santoni, C, Sarigiannis, K, Schäfer, M, Schaller, L A, Schopper, A, Schune, P, Soares, A, Tauscher, Ludwig, Thibault, C, Touchard, F, Touramanis, C, Triantis, F A, Tröster, D A, Van Beveren, E, van Eijk, C W E, Vlachos, S, Weber, P, Wigger, O, Witzig, C, Wolter, M, Yéche, C, Zavrtanik, D, and Zimmerman, D

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

The essential characteristics of the neutral kaon system and the way CP, T, and possible CPT violations may be observed in it are recalled. The principle of the CPLEAH experiment is presented CPLEAH experimental results in the semi-leptonic decay channels are given and discussed. It is shown, in particular, that direct. time reversal invariance violation will be experimentally observed for the first time.

Published
1996

12. Direct evidence for T violation in the neutral kaon system

Author

Adler, R, Alhalel, T, Angelopoulos, Angelos, Aspostolakis, A, Aslanides, Elie, Backenstoss, Gerhard, Bee, C P, Behnke, O, Benelli, A, Bertin, V, Blanc, F, Bloch, P, Bula, C, Carlson, P J, Carroll, M, Carvalho, J, Cawley, E, Charalambous, S, Chardalas, M, Chardin, G, Chertok, M B, Cody, A, Danielsson, M, Dedoussis, S, Dejardin, M, Derré, J, 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, Maria, Filipcic, A, Francis, D, Fry, J, Gabathuler, Erwin, Gamet, R, Garreta, D, Gerber, H J, Go, A, Guyot, C, Haselden, A, Hayman, P J, Henry-Coüannier, F, Hollander, R W, Hubert, E, Jon-And, K, Kettle, P R, Kochowski, Claude, Kokkas, P, Kreuger, R, Le Gac, R, Leimgruber, F, Liolios, A, Machado, E, Mandic, I, Manthos, N, Marel, Gérard, Mikuz, M, Miller, J, Montanet, François, Nakada, Tatsuya, Onofre, A, Pagels, B, Papadopoulos, I M, Pavlopoulos, P, Pinto da Cunha, J, Policarpo, Armando, Polivka, G, Rickenbach, R, Roberts, B L, Rozaki, E, Ruf, T, Sakelliou, L, Sanders, P, Santoni, C, Sarigiannis, K, Schäfer, M, Schaller, L A, Schopper, A, Schune, P, Soares, A, Tauscher, Ludwig, Thibault, C, Touchard, F, Touramanis, C, Triantis, F A, Van Beveren, E, van Eijk, C W E, Varner, G S, Vlachos, S, Weber, P, Wigger, O, Wolter, M, Yéche, C, Zavrtanik, D, and Zimmerman, D

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

We present the first direct observation of T violation in the neutral kaon system, showing a positive signal with a significance of more than two standard deviations. The result does not rely on the validity of the CPT theorem.

Published
1995

13. Experimental tests of CPT symmetry and quantum mechanics at CPLEAR

Author

Mavromatos, N. E., Ruf, T., Adler, R., Alhalel, T., Angelopoulos, A., Apostolakis, A., Aslanides, E., Backenstoss, G., Bee, C. P., Behnke, O., Benelli, A., Bertin, V., Frédéric Blanc, Bloch, P., Bula, Ch, Carlson, P., Carroll, M., Carvalho, J., Cawley, E., Charalambous, S., Chardalas, M., Chardin, G., Chertok, M. B., Cody, A., Danielsson, M., Dedoussis, S., Dejardin, M., Derre, J., 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., Filipicic, A., Francis, D., Fry, John R., Gabathuler, E., Gamet, R., Garreta, D., 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., Mikuez, M., Miller, J., Montanet, F., Nakada, T., Onofre, A., Pagels, B., Papadopoulos, I., Pavlopoulos, P., Pinto Da Cunha, J., Policarpo, A., Polivka, G., Rickenbach, R., Roberts, B. L., Rozaki, E., Sakeliou, L., Sanders, P., Santoni, C., Sarigiannis, K., Schafer, M., Schaller, L. A., Schopper, A., Schune, P., Soares, A., Tauscher, L., Thibault, C., Touchard, F., Touramanis, C., Triantis, F., Beveren, Eef, 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, Jorge L., and Nanopoulos, Dimitri V.

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Particle Physics - Phenomenology
Abstract

We review a phenomenological parametrization of an open quantum-mechanical formalism for CPT violation in the neutral kaon system, and constrain the parameters using fits to recent CPLEAR data. We review a phenomenological parametrization of an open quantum-mechanical formalism for CPT violation in the neutral kaon system, and constrain the parameters using fits to recent CPLEAR data.

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