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

Subjects
High Energy Physics::Experiment
Abstract

A detailed description of the analysis of neutral kaons decaying to e pi nu is given, based on the complete set of data collected with the CPLEAR experiment, Using a novel approach involving initially strangeness-tagged K-0 and (K) over bar (0), time-dependent decay-rate asymmetries were measured, These asymmetries enabled T- and CPT-violation parameters to be measured in the context of a systematic study. The highlights of this study arc the first direct observation of T violation and the direct determination of the CPT parameter Re(delta) with an accuracy improved by two orders of magnitude with respect to the current value.

Published
2001

2. Measurement of the energy dependence of the form factor f(+) in K-e3(0) decay

Author

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

Abstract

Neutral-kaon decays to pi e nu were analysed to determine the q(2) dependence of the K-e3(0), electroweak form factor f(+). Based on 365612 events, this form factor was found to have a linear dependence on q(2) with a slope lambda(+) = 0.0245 +/- 0.0012(stat) +/- 0.0022(syst). (C) 2000 Published by Elsevier Science B.V. All rights reserved.

Published
2000

3. Dispersion relation analysis of the neutral kaon regeneration amplitude in carbon

Author

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

Abstract

We apply a forward dispersion relation to the regeneration amplitude for kaon scattering on C-12 using all available data. The CPLEAR data at low energies allow the determination of the net contribution from the subthreshold region which turns out to be much smaller than earlier evaluations, solving a long standing puzzle.

Published
1999

4. K-0-(K)over-bar(0) mass and decay-width differences: CPLEAR evaluation

Author

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

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

The CPT-violation parameters Re(delta) and Im(delta) determined recently by CPLEAR are used to evaluate the K-0-(K) over bar(0) mass and decay-width differences, as given by the difference between the diagonal elements of the neutral-kaon mixing matrix (M - i Gamma/2). The results - (M-K0K0 - M0 ($) over bar 0)) = (- 1.5 +/- 2.0) x 10(-18) GeV and (Gamma(K0K0) - Gamma(($) over bar 0 ($) over bar 0)) = (3.9 +/- 4.2) x 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. (C) 1999 Elsevier Science B.V. All rights reserved.

Published
1999

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

Author

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

Subjects
High Energy Physics::Phenomenology, High Energy 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.

Published
1999

6. Pion correlations and resonance effects in (p)over-bar-p annihilation at rest to 2 pi(+)2 pi(-)pi(0)

Author

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

Abstract

We study pi pi correlations in the exclusive reaction (p) over bar p –> 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 pi(0) 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 rho 3 pi 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

7. A determination of the CP violation parameter eta(+-) from the decay of strangeness-tagged neutral kaons

Author

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

Abstract

{We report a measurement of the CP violation parameter eta(+-) from the time-dependent asymmetry between the decay rates of initially tagged K-0 and (K) over bar(0). The results are based on the complete data sample collected by the CPLEAR collaboration. With Delta m = (530.1 +/- 1.4) X 10(7)(h) over bar s(-1) and tau(S) = (89.34 +/- 0.08) ps, the values obtained are \textbackslash{}eta(+-)\textbackslash{} = (2.264 +/- 0.023(stat) +/- 0.026(syst) +/- 0.007 tau(s)) x 10(-3) and phi(+-) = 43.19 degrees +/- 0.53(stat)degrees +/- 0.28(syst)degrees + 0.42(Delta m)degrees. (C) 1999 Published by Elsevier Science B.V. All rights reserved.}

Published
1999

8. The neutral kaon decays to pi(+)pi(-)pi(0): a detailed analysis of the CPLEAR data

Author

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

Subjects
High Energy Physics::Experiment
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 K-0 and (K) over bar(0) and for different regions of the phase space. These asymmetries, resulting from the interference between the CP-coaserving decay amplitude of K-L and the decay amplitude of K-S - either CP-violating or CP-conserving - allow the determination of the K-S parameters eta(+-0) (CP-violating) and lambda (CP-conserving), and also of the main isospin components of the K-S decay amplitude. The branching ratio of K-S –> pi(+)pi(-)pi(0) (CP-conserving) is deduced directly from lambda. In addition, we extract the slope parameters describing the energy dependence of the K-L –> pi(+)pi(-)pi(0) Dalitz plot. The whole set of out. results fits well within the current phenomenological picture of the neutral-kaon system including CP violation and Chiral Perturbation Theory (ChPT).

Published
1998

9. Measurement of the CP-violation parameter eta(00) using tagged (K)over-bar(0) and K-0

Author

Angelopoulos, A Apostolakis, A Aslanides, E Backenstoss, G and Bargassa, P Behnke, O Benelli, A Bertin, V Blanc, F and Bloch, P Carlson, P Carroll, M Carvalho, J Cawley, E and Charalambous, S Chardin, G Chertok, MB Cody, A and Danielsson, M Dejardin, M Derre, J Ealet, A and Eleftheriadis, C Evangelou, I Faravel, L Ferreira-Marques, R and Fetscher, W Fidecaro, M Filipcic, A Francis, D Fry, J Gabathuler, E Gamet, R Garreta, D Gerber, HJ Go, A and Haselden, A Hayman, PJ Henry-Couannier, F Hollander, RW and Hubert, E Jon-And, K Kettle, PR Kokkas, P Kreuger, R and Le Gac, R Leimgruber, F Liolios, A Machado, E and Mandic, I Manthos, N Marel, G Mikuz, M Miller, J and Montanet, F Muller, A Nakada, T Pagels, B Papadopoulos, I Pavlopoulos, P da Cunha, JP Policarpo, A Polivka, G and Rickenbach, R Roberts, BL Ruf, T Sakeliou, L and Sanders, P Schafer, M Schaller, LA Schietinger, T and Schopper, A Tauscher, L Thibault, C Touchard, F and Touramanis, C Triantis, F Van Beveren, E Van Eijk, CWE and Vlachos, S Weber, P Wigger, O Wolter, M Yeche, C and Zavrtanik, D Zimmerman, D CPLEAR Collaboration

Abstract

{The CP-violation parameter eta(00) is determined through the eigentime-dependent asymmetry in the rates of initially tagged (K) over bar(0) and K-0 decaying to pi(0) pi(0). From the analysis of the complete data set we obtain the values \textbackslash{}eta(00)\textbackslash{} = {[}2.47 +/- 0.31(stat) +/- 0.24(syst.)] x 10(-3) and phi(00) = 42.0(0) +/- 5.6(stat.)(0) +/- 1.9(syst.)(0). (C) 1998 Elsevier Science B.V.}

Published
1998

10. Direct determination of two-pion correlations for pp -> 2 pi(+)2 pi(-) annihilation at rest

Author

Angelopoulos, A Apostolakis, A Aslanides, E Backenstoss, G and Bargassa, P Behnke, O Benelli, A Bertin, V Blanc, F and Bloch, P Carlson, P Carroll, M Carvalho, J Cawley, E and Charalambous, S Chardin, G Chertok, MB Cody, A and Danielsson, M Dejardin, M Derre, J Ealet, A and Eleftheriadis, C Evangelou, I Faravel, L Ferreira-Marques, R and Fetscher, W Fidecaro, M Filipcic, A Francis, D Fry, J Gabathuler, E Gamet, R Garreta, D Gerber, HJ Go, A and Haselden, A Hayman, PJ Henry-Couannier, F Hollander, RW and Hubert, E Jon-And, K Kettle, PR Kokkas, P Kreuger, R and Le Gac, R Leimgruber, F Liolios, A Locher, MP and Machado, E Mandic, I Manthos, N Marel, G Markushin, VE and Mikuz, M Miller, J Montanet, F Muller, A Nakada, T and Pagels, B Papadopoulos, I Pavlopoulos, P da Cunha, JP and Policarpo, A Polivka, G Rickenbach, R Roberts, BL and Ruf, T Sakeliou, L Sanders, P Schafer, M Schaller, LA and Schietinger, T Schopper, A Soares, A Tauscher, L and Thibault, C Touchard, F Touramanis, C Triantis, F Van Beveren, E Van Eijk, CWE Vlachos, S Weber, P Wigger, O and Wolter, M Yeche, C Zavrtanik, D Zimmerman, D

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

We study pi pi correlations in the exclusive reaction (p) over bar p –> 2 pi(+)2 pi(-) 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

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

Author

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

Abstract

We report on the first observation of time-reversal symmetry violation through a comparison of the probabilities of (K) over bar(0) transforming into K-0 and K-0 into (K) over bar(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 –> K (+/-) pi (+/-) K-0 ((K) over bar(0)) at rest, whereas the strangeness of the kaon at the decay time t = tau was tagged by the lepton charge in the final state. An average decay-rate asymmetry [R((K) over bart=00 –> e+pi-nut=tau) - R(Kt=00 –> e-pi+t=tau)/R((K) over bart=00 –> e+pi-nut=tau) + R(Kt=00 –> e-pi+t=tau)] = (6.6 +/- 1.3stat +/- 1.0syst) X 10-3 was measured over the interval 1 tau(S) < tau < 20 tau(S), thus leading to evidence for time-reversal non-invariance. (C) 1998 Elsevier Science B.V. All righs reserved.

Published
1998

12. Search for CP violation in the decay of tagged (K)over-bar(0) and K-0 to pi(0)pi(0)pi(0)

Author

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

Abstract

The CPLEAR experiment measured the eigentime-dependent asymmetry in the rates of initially tagged (K) over bar(o) and K-o decaying to pi(o) pi(o) pi(o) 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 eta(ooo) the values Re(eta(ooo))= 0.18 +/- 0.14(stat.) +/- 0.06(syst.) and Im(eta(ooo)) = 0.15 +/- 0.20(stat) +/- 0.03(syst:) Requiring Re(eta(ooo)) to be equal to Re(epsilon) we obtain Im(eta(ooo)) = -0.05 +/- 0.12(stat.) +/- 0.05(syst:) The corresponding upper limit for the branching ratio of the K-S –> pi(o) pi(o) pi(o) decay is deduced to be BKs –> pi o pi o pi o

Published
1998

13. Measurement of the K-L-K-S mass difference using semileptonic decays of tagged neutral kaons

Author

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

Abstract

We report on a new measurement of the K-L-K-S mass difference Delta m using the CPLEAR full data sample of neutral-kaon decays to e pi nu. The result is Delta m = (0.5295 +/- 0.0020(stat) +/- 0.0003(syst)) X 10(10) (h) over bar/s. It includes earlier data reported in R. Adler et al., CPLEAR Collaboration, Phys. Lett. B 363 (1995) 237. A measurement of the Delta S = Delta Q violating parameter Re(x) is also obtained. (C) 1998 Elsevier Science B.V. All rights reserved.

Published
1998

14. An EPR experiment testing the non-separability of the K-0(K)over-bar(0) wave function

Author

Apostolakis, A Aslanides, E Backenstoss, G Bargassa, P and Behnke, O Benelli, A Bertin, V Blanc, F Bloch, P and Carlson, P Carroll, M Cawley, E Chardin, G Chertok, MB and Cody, A Dejardin, M Derre, J Ealet, A Eleftheriadis, C Ferreira-Marques, R Fetscher, W Fidecaro, M Filipcic, A Francis, D Fry, J Gabathuler, E Gamet, R Gerber, HJ Go, A Guyot, C Haselden, A Hayman, PJ and Henry-Couannier, F Hollander, RW Hubert, E Jon-And, K and Kettle, PR Kochowski, C Kokkas, P Kreuger, R Le Gac, R and Leimgruber, F Mandic, I Manthos, N Marel, G Mikuz, M and Miller, J Montanet, F Muller, A Nakada, T Pagels, B and Papadopoulos, I Pavlopoulos, P Policarpo, A Polivka, G and Rickenbach, R Roberts, BL Ruf, T Schafer, M and Schaller, LA Schietinger, T Schopper, A Schune, P and Tauscher, L Thibault, C Touchard, F Touramanis, C Van Eijk, CWE Vlachos, S Weber, P Wigger, O Wolter, M and Yeche, C Zavrtanik, D CPLEAR Collaboration

Abstract

The EPR-type strangeness correlation in the K-0 system produced in the reaction –> K-0 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 ar creation (CL > 99.99%). (C) 1998 Elsevier Science B.V.

Published
1998

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

Subjects
High Energy Physics::Experiment
Abstract

We have improved by two orders of magnitude the Limit currently available for the CPT violation parameter Re(delta). To this purpose we have analyzed the full sample of neutral-kaon decays to e pi nu 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 pi(+)pi(-) decay channel, gives directly Re(delta). The result Re(delta) = (3.0 +/- 3.3(stat) +/- 0.6(syst)) X 10(-4) is compatible with zero. Values for the parameters Im(delta), Re(x(-)) and Im(x(+)) were also obtained. (C) 1998 Elsevier Science B.V. All rights reserved.

Published
1998

16. CPLEAR results on the CP parameters of neutral kaons decaying to pi(+)pi(-)pi(0)

Author

Adler, R Angelopoulos, A Apostolakis, A Aslanides, E and Backenstoss, G Bargassa, P Bee, CP Behnke, O Benelli, A and Bertin, V Blanc, F Bloch, P Carlson, P Carroll, M and Carvalho, J Cawley, E Charalambous, S Chardin, G and Chertok, MB Cody, A Danielsson, M Dejardin, M Derre, J and Ealet, A Eckart, B Eleftheriadis, C Evangelou, I and Faravel, L Fassnacht, P Felder, C FerreiraMarques, R and Fetscher, W Fidecaro, M Filipcic, A Francis, D Fry, J and Gabathuler, E Gamet, R Garreta, D Gerber, HJ Go, A and Guyot, C Haselden, A Hayman, PJ HenryCouannier, F and Hollander, RW Hubert, E JonAnd, K Kettle, PR Kochowski, C Kokkas, P Kreuger, R LeGac, R Leimgruber, F and Liolios, A Machado, E Mandic, I Manthos, N Marel, G and Mikuz, M Miller, J Montanet, F Muller, A Nakada, T and Pagels, B Papadopoulos, I Pavlopoulos, P daCunha, JP and Policarpo, A Polivka, G Rickenbach, R Roberts, BL Ruf, T and Sakeliou, L Sanders, P Santoni, C Schafer, M and Schaller, LA Schietinger, T Schopper, A Schune, P and Soares, A Tauscher, L Thibault, C Touchard, F and Touramanis, C Triantis, F VanBeveren, E VanEijk, CWE and Vlachos, S Weber, P Wigger, O Wolter, M Yeche, C and Zavrtanik, D Zimmerman, D

Abstract

The CPLEAR experiment measured time-dependent decay-rate asymmetries of K-0 and (K) over bar(0) decaying to pi(+)pi(-)pi(0) in order to study the interference between the decay amplitudes of K-S(0) - either CP-violating or CP-conserving - and the CP-conserving K-L(0) decay amplitude. From the analysis of the complete data set we find for the CP-violating parameter eta(+-0), Re((+-0)) = (-2 +/- 7 stat. (+4)(-1) syst.) x 10(-3), Im(eta(+-0)) = (-2 +/- 9 stat. (+2)(-1) syst.) x 10(-3) and for the CP-conserving parameter lambda, Re(lambda) = (+28 +/- 7 stat. +/-3 syst.) x 10(-3), Im(lambda) = (-10 +/- 8 stat. +/- 2 syst.) x 10(-3). From the latter, the branching ratio of the CP-conserving (KS)-S-0 –> pi(+)pi(-)pi(0) decay is deduced to be B = (2.5(-1.0)(+1.3) stat. (+0.5)(-0.6) systs.) x 10(-7). (C) 1997 Elsevier Science B.V.

Published
1997

17. An upper limit for the branching ratio of the decay K-s->e(+)e(-)

Author

Angelopoulos, A Apostolakis, A Aslanides, E Backenstoss, G and Bargassa, P Behnke, O Benelli, A Bertin, V Blanc, F and Bloch, P Carlson, P Carroll, M Carvalho, J Cawley, E and Charalambous, S Chardin, G Chertok, MB Cody, A and Danielsson, M Dejardin, M Derre, J Ealet, A and Eleftheriadis, C Evangelou, I Faravel, L FerreiraMarques, R and Fetscher, W Fidecaro, M Filipcic, A Francis, D Fry, J Gabathuler, E Gamet, R Garreta, D Gerber, HJ Go, A and Haselden, A Hayman, PJ HenryCouannier, F Hollander, RW and Hubert, E JonAnd, K Kettle, PR Kokkas, P Kreuger, R and LeGac, R Leimgruber, F Liolios, A Machado, E Mandic, I Manthos, N Marel, G Mikuz, M Miller, J Montanet, F and Muller, A Nakada, T Pagels, B Papadopoulos, I and Pavlopoulos, P daCunha, JP Policarpo, A Polivka, G and Rickenbach, R Roberts, BL Ruf, T Sakeliou, L Sanders, P and Schafer, M Schaller, LA Schietinger, T Schopper, A and Soares, A Auscher, L Thibault, C Touchard, F Touramanis, C Triantis, F VanBeveren, E VanEijk, CWE Vlachos, S and Weber, P Wigger, O Wolter, M Yeche, C Zavrtanik, D and Zimmerman, D

Abstract

A search for the decay K-S –> e(+)e(-) was performed within the framework of the CPLEAR experiment. Full event reconstruction together with e/pi separation allowed powerful background rejection and high signal acceptance. The analysis of the complete set of data yields the result: BR(K-S –> e(+)e(-)) < 1.4 x 10(-7) (90% CL), an improvement on the current experimental limit by a factor of 20. (C) 1997 Published by Elsevier Science B.V.

Published
1997

18. The CPLEAR-experiment at CERN

Author

Adler, R Alhalel, T Angelopoulos, A Apostolakis, A and Aslanides, E Backenstoss, G Bargassa, P Bee, CP Behnke, O Benelli, A Bertin, V Blanc, F Bloch, P Carlson, P and Carroll, M Carvalho, J Cawley, E Charalambous, S and Chardin, G Chertok, MB Cody, A Danielsson, M Dejardin, M and Derre, J Ealet, A Eckart, B Eleftheriadis, C and Evangelou, I Faravel, L Fassnacht, P Felder, C and FerreiraMarques, R Fetscher, W Fidecaro, M Filipcic, A and Francis, D Fry, J Gabathuler, E Gamet, R Garreta, D and Gerber, HJ Go, A Guyot, C Haselden, A Hayman, PJ and HenryCouannier, F Hollander, RW Hubert, E JonAnd, K and Kettle, PR Kochowski, C Kokkas, P Kreuger, R LeGac, R and Leimgruber, F Liolios, A Machado, E Mandic, I and Manthos, N Marel, G Mikuz, M Miller, J Montanet, F and Nakada, T Pagels, B Papadopoulos, I Pavlopoulos, P and daCunha, JP Policarpo, A Polivka, G Rickenbach, R and Roberts, BL Ruf, T Sakeliou, L Sanders, P Santoni, C and Schafer, M Schaller, LA Schietinger, T Schopper, A and Schune, P Soares, A Tauscher, L Thibault, C Touchard, F and Touramanis, C Triantis, F VanBeveren, E VanEijk, CWE and Vlachos, S Weber, P Wigger, O Wolter, M Yeche, C and Zavrtanik, D Zimmerman, D

Abstract

The CPLEAR experiment uses tagged K-0 and (K) over bar(0) produced in p (p) over bar 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

19. Experimental measurement of the KSKS/KSKL ratio in antiproton annihilations at rest in gaseous hydrogen at 15 and 27 bar

Author

Adler, R Alhalel, T Angelopoulos, A Apostolakis, A and Aslanides, E Backenstoss, G Bargassa, P Bee, CP Behnke, O Benelli, A Bertin, V Blanc, F Bloch, P Carlson, P and Carroll, M Carvalho, J Cawley, E Charalambous, S and Chardin, G Chertok, MB Cody, A Danielsson, M Dejardin, M and Derre, J Ealet, A Eckart, B Eleftheriadis, C and Evangelou, I Faravel, L Fassnacht, P Felder, C and FerreiraMarques, R Fetscher, W Fidecaro, M Filipcic, A and Francis, D Fry, J Gabathuler, E Gamet, R Garreta, D and Gerber, HJ Go, A Guyot, C Haselden, A Hayman, PJ and HenryCouannier, F Hollander, RW Hubert, E JonAnd, K and Kettle, PR Kochowski, C Kokkas, P Kreuger, R LeGac, R and Leimgruber, F Liolios, A Machado, E Mandic, I and Manthos, N Marel, G Mikuz, M Miller, J Montanet, F and Muller, A Nakada, T Pagels, B Papadopoulos, I and Pavlopoulos, P daCunha, JP Policarpo, A Polivka, G and Rickenbach, R Roberts, BL Ruf, T Sakeliou, L Sanders, P and Santoni, C Schafer, M Schaller, LA Schietinger, T and Schopper, A Schune, P Soares, A Tauscher, L Thibault, C and Touchard, F Touramanis, C Triantis, F VanBeveren, E and VanEijk, CWE Vlachos, S Weber, P Wigger, O Wolter, M and Yeche, C Zavrtanik, D Zimmerman, D

Abstract

The ratio R between the branching fractions of (p) over bar p –> KSKS and (p) over bar p –> KSKL 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. (C) 1997 Published by Elsevier Science B.V.

Published
1997

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

Author

Angelopoulos, A Apostolakis, A Aslanides, E Backenstoss, G and Bargassa, P Behnke, O Benelli, A Bertin, V Blanc, F and Bloch, P Carlson, P Carroll, M Carvalho, J Cawley, E and Charalambous, S Chardin, G Chertok, MB Cody, A and Danielsson, M Dejardin, M Derre, J Ealet, A and Eleftheriadis, C Evangelou, I Faravel, L Ferreira-Marques, R and Fetscher, W Fidecaro, M Filipcic, A Francis, D Fry, J Gabathuler, E Gamet, R Garreta, D Gerber, HJ Go, A and Haselden, A Hayman, PJ Henry-Couannier, F Hollander, RW and Hubert, E Jon-And, K Kettle, PR Kokkas, P Kreuger, R and Le Gac, R Leimgruber, F Liolios, A Machado, E and Mandic, I Manthos, N Marel, G Mikuz, M Miller, J and Montanet, F Muller, A Nakada, T Pagels, B Papadopoulos, I Pavlopoulos, P da Cunha, JP Policarpo, A Polivka, G and Rickenbach, R Roberts, BL Ruf, T Sakeliou, L and Sanders, P Schafer, M Schaller, LA Schietinger, T and Schopper, A Soares, A Tauscher, L Thibault, C Touchard, F Touramanis, C Triantis, F Van Beveren, E Van Eijk, CWE and Vlachos, S Weber, P Wigger, O Wolter, M Yeche, C and Zavrtanik, D Zimmerman, D

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.

Published
1997

21. Search for CP violation in the decay of neutral kaons to pi(+)pi(-)pi(0)

Author

Adler, R Alhalel, T Angelopoulos, A Apostolakis, A and Aslanides, E Backenstoss, G Bee, CP Behnke, O Benelli, A and Bennet, J Bertin, V Bienlein, JK Blanc, F Bloch, P and Bula, C Carlson, P Carroll, M Carvalho, J Cawley, E and Charalambous, S Chardalas, M Chardin, G Chertok, MB and Cody, A Danielsson, M Dedoussis, S Dejardin, M Derre, J and Dodgson, M Duclos, J Ealet, A Eckart, B and Eleftheriadis, C Evangelou, I Faravel, L Fassnacht, P and Faure, JL Felder, C FerreiraMarques, R Fetscher, W and Fidecaro, M Filipcic, A Francis, D Fry, J Fuglesang, C and Gabathuler, E Gamet, R Garreta, D Geralis, T Gerber, HJ Go, A Gumplinger, P Guyot, C Harrison, PF and Haselden, A Hayman, PJ HenryCouannier, F Heyes, WG and Hollander, RW Hubert, E Jansson, K Johner, HU JonAnd, K and Kettle, PR Kochowski, C Kokkas, P Kreuger, R Lawry, T LeGac, R Leimgruber, F Liolios, A Machado, E and Maley, P Mandic, I Manthos, N Marel, G Mikuz, M and Miller, J Montanet, F Nakada, T Onofre, A Pagels, B and Papadopoulos, I Pavlopoulos, P Pelucchi, F daCunha, JP and Policarpo, A Polivka, G Postma, H Rickenbach, R Roberts, BL Rozaki, E Ruf, T Sacks, L Sakeliou, L Sanders, P and Santoni, C Sarigiannis, K Schafer, M Schaller, LA and Schietinger, T Schopper, A Schune, P Soares, A Tauscher, L Thibault, C Touchard, F Touramanis, C Triantis, F and Troster, DA VanBeveren, E VanEijk, CWE Varner, G and Vlachos, S Weber, P Wigger, O Witzig, C Wolter, M and Yeche, C Zavrtanik, D Zimmerman, D

Abstract

{The time-dependent rate asymmetry of initial K-0 and (K) over bar(0) decaying into pi(+)pi(-)pi(0) CP-violating amplitude of the K-S --> pi(+)pi(-)pi(0) decay. For the real and the imaginary parts of eta(+-0), we find Re(eta(+-0)) = (6 +/- 13(stat.) +/- 1(syst.)) x 10(-3) and Im(eta(+-0)) = (-2 +/- 18(stat.) +/- 3(syst.)) x 10(-3) which correspond to \textbackslash{}eta(+-0)\textbackslash{} < 0.037 with 90\% CL.}

Published
1996

22. Observation of the CP-conserving K-S->pi(+)pi(-)pi(0) decay amplitude

Author

Adler, R Alhalel, T Angelopoulos, A Apostolakis, A and Aslanides, E Backenstoss, G Bee, CP Behnke, O Benelli, A and Bennet, J Bertin, V Bienlein, JK Blanc, F Bloch, P and Bula, C Carlson, P Carroll, M Carvalho, J Cawley, E and Charalambous, S Chardalas, M Chardin, G Chertok, MB and Cody, A Danielsson, M Dedoussis, DP Dejardin, M Derre, J and Dodgson, M Duclos, J Ealet, A Eckart, B and Eleftheriadis, C Evangelou, I Faravel, L Fassnacht, P and Faure, JL Felder, C FerreiraMarques, R Fetscher, W and Fidecaro, M Filipcic, A Francis, D Fry, J Fuglesang, C and Gabathuler, E Garnet, R Garreta, D Geralis, T and Gerber, HJ Go, A Gumplinger, P Guyot, C Harrison, PF and Haselden, A Hayman, PJ HenryCouannier, F Heyes, WG and Hollander, RW Hubert, E Jansson, K Johner, HU JonAnd, K and Kettle, PR Kochowski, C Kokkas, P Kreuger, R Lawry, T LeGac, R Leimgruber, E Liolios, A Machado, E and Maley, P Mandic, I Manthos, N Marel, G Mikuz, M and Miller, J Montanet, F Nakada, T Onofre, A Pagels, B and Papadopoulos, I Pavlopoulos, P Pelucchi, F daCunha, JP and Policarpo, A Polivka, G Postma, H Rickenbach, R Roberts, BL Rozaki, E Ruf, T Sacks, L Sakeliou, L Sanders, P and Santoni, C Sarigiannis, K Schafer, M Schaller, LA and Schietinger, T Schopper, A Schune, P Soares, A Tauscher, L Thibault, C Touchard, E Touramanis, C Triantis, F and Troster, DA VanBeveren, E VanEijk, CWE Varner, G and Vlachos, S Weber, P Wigger, O Witzig, C Wolter, M and Yeche, C Zavrtanik, D Zimmerman, D

Abstract

The interference between CP-conserving K-S and K-L –> pi(+)pi(-)pi(0) decay amplitudes was observed by studying the decay rate asymmetries between initial K-0 and (K) over bar(0) separately for the phase space regions E(CM)(pi(+)) > E(CM)(pi(-)) and E(CM)(pi(+)) < E(CM)(pi(-)) For the parameter lambda we found Re(lambda) = 0.036 +/- 0.010(stat.)(-0.003)(+0.002)(syst.) and Im(lambda) consistent with zero, leading to a branching ratio B = [4.1(-1.9)(+2.5)(stat.)(-0.6)(+0.5)(syst.)] x 10(-7) for the CP-conserving K-S –> pi(+)pi(-)pi(0) decay.

Published
1996

23. The CPLEAR detector at CERN

Author

Adler, R Albrecht, W Alhalel, T Angelopoulos, A and Apostolakis, A Aslanides, E Backenstoss, G Bal, F Bard, JP Barraca, D Bee, CP Behnke, O Benelli, A Bennet, J and Bertin, V Blanc, F Bloch, P Bonnet, M Bula, C and Calzas, A Carlson, P Carroll, M Carvalho, J Cawley, E and Charalambous, S Chardalas, M Chardin, G Charra, P and Chertok, MB Cody, A daSilva, J Damianoglou, D Daniel, R and Danielsson, M Dechelette, P Dedieu, M Dedoussis, S and Dejardin, M Derre, J Dijksman, A Dinkespiller, B and Dodgson, M Droge, M Duclos, J Dudragne, N Durand, D and Ealet, A Eckart, B Eleftheriadis, C Engster, C and Evangelou, I Faravel, L Fassnacht, P Faure, JL Felder, C and FerreiraMarques, R Fetscher, W Fidecaro, M Filipcic, A and Francis, D Fry, J Fuglesang, C Gabathuler, E Gally, Y Gamet, R Garreta, D Geiss, D Geralis, T Gerber, HJ and Go, A Gumplinger, P Guyon, D Guyot, C Harrison, P and Harrison, PF Haselden, A Hayman, PJ Hazen, E and HenryCouannier, F Heyes, WG Hollander, RW Hubert, E and Jacobs, C Jansson, K Johner, HU JonAnd, K Karkour, N and Kerek, A Kern, J Kesseler, G Kettle, PR King, D and Klados, T Kochowski, C Kokkas, P Kontek, K Kreuger, R and Lawry, T Lecouturier, D LeGac, R Leimgruber, F and Linget, D Liolios, A Lofstedt, B Louis, F Machado, E and Maley, P Mall, U Mandic, I Manthos, N Marel, G and Marin, CP Martin, H Michau, JC Mikuz, M Miller, J and Montanet, F Nakada, T Nanni, F Onofre, A Pagels, B and Papadopoulos, I Pavlopoulos, P Pelucchi, F Petit, P and Philippoussis, K daCunha, JP Policarpo, A Polivka, G and Postma, H Rheme, C Rickenbach, R Roberts, BL Rozaki, E and Ruf, T Sacks, L Sakeliou, L Sanders, P Santoni, C and Sarigiannis, K Schafer, M Schaller, LA Schietinger, T and Schopper, A Schune, P Soares, A Steinacher, M and Tatsis, S Tauscher, L Thibault, C Touchard, F and Touramanis, C Triantis, F Troster, DA Tsamouranis, I and Tschopp, H Tsilimigras, P vanBeveren, E vanEijk, CWE and vanKoningsveld, B Vanuxem, JP Varner, G Verweij, H and Vlachos, S WArner, D Watson, E Weber, P Wendler, H and Wigger, O Witzig, C Wolter, M Yeche, C Zavrtanik, D and Zimmerman, D

Subjects
Physics::Instrumentation and Detectors, High Energy Physics::Experiment
Abstract

The CPLEAR collaboration has constructed a detector at CERN for an extensive programme of CP-, T- and CPT-symmetry studies using K-0 and produced by the annihilation of in a hydrogen gas target. The K-0 and are identified by their companion products of the annihilation K(+/-)pi(-/+) 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 subdetectors are described.

Published
1996

24. Measurement of CP violation parameters and test of CPT invariance with (K-0)over-bar and K-0 at LEAR

Author

Adler, R Alhalel, T Angelopoulos, A Apostolakis, A and Aslanides, E Backenstoss, G Bee, CP Behnke, O Benelli, A and Bertin, V Blanc, F Bloch, P Bula, C Carlson, P and Carroll, M Carvalho, J Cawley, E Charalambous, S and Chardalas, M Chardin, G Chertok, MB Cody, A Danielsson, M Dedoussis, S Dejardin, M Derre, J Duclos, J Ealet, A Eckart, B Eleftheriadis, C Evangelou, I Faravel, L and Fassnacht, P Faure, JL Felder, C FErreiraMarques, R and Fetscher, W Fidecaro, M Filipcic, A Francis, D Fry, J and Gabathuler, E Gamet, R Garreta, D Gerber, HJ Go, A and Guyot, C Haselden, A Hayman, PJ HenryCouannier, F and Hollander, RW Hubert, E JonAnd, K Kettle, PR Kochowski, C Kokkas, P Kreuger, R LeGac, R Leimgruber, F and Liolios, A Machado, E Mandic, I Manthos, N Marel, G and Mikuz, M Miller, J Montanet, F Nakada, T Onofre, A and Pagels, B Papadopoulos, I Pavlopoulos, P daCunha, JP and Policarpo, A Polivka, G Rickenbach, R Roberts, BL and Rozaki, E Ruf, T Sakeliou, L Sanders, P Santoni, C and Sarigiannis, K Schafer, M Schaller, LA Schopper, A and Schune, P Soares, A Tauscher, L Thibault, C Touchard, F and Tourmanis, C Triantis, F VanBeveren, E VanEijk, CWE and Varner, G Vlachos, S Weber, P Wigger, O Wolter, M and Yeche, C Zavrtanik, D Zimmerman, D

Subjects
High Energy Physics::Experiment
Abstract

The CPLEAR experiment at CERN studies the CP, T and CPT symmetries in the neutral-kaon system by measuring the rate asymmetries between the decays of initially pure K-0 and (K-0) over bar states. Using data taken between 1900 and mid 1994, precise measurements of η(+ -) phi(+ -) and Delta m are reported. The comparison of phi(+ -) with the superweak phase gives one of the most sensitive tests of CPT invariance and leads to a new limit on the K-0-(K-0) over bar mass difference.

Published
1996

25. First observation of a particle antiparticle asymmetry in the decay of neutral kaons into pi(0)pi(0)

Author

Adler, R Alhalel, T Angelopoulos, A Apostolakis, A and Aslanides, E Backenstoss, G Bee, CP Behnke, O Benelli, A and Bennet, J Bertin, V Bienlein, JK Blanc, F Bloch, P and Bula, C Carlson, P Carroll, M Carvalho, J Cawley, E and Charalambous, S Chardalas, M Chardin, G Chertok, MB and Cody, A Danielsson, M Dedoussis, S Dejardin, M Derre, J and Dodgson, M Duclos, J Ealet, A Eckart, B and Eleftheriadis, C Evangelou, I Faravel, L Fassnacht, P and Faure, JL Felder, C FerreiraMarques, R Fetscher, W and Fidecaro, M Filipcic, A Francis, D Fry, J Fuglesang, C and Gabathuler, E Gamet, R Garreta, D Geralis, T Gerber, HJ Go, A Gumplinger, P Guyot, C Harrison, PF and Haselden, A Hayman, PJ HenryCouannier, F Heyes, WG and Hollander, RW Hubert, E Jansson, K Johner, HU JonAnd, K and Kettle, PR Kochowski, C Kokkas, P Kreuger, R Lawry, T LeGac, R Leimgruber, F Liolios, A Machado, E and Maley, P Mandic, I Manthos, N Marel, G Mikuz, M and Miller, J Montanet, F Nakada, T Onofre, A Pagels, B and Papadopoulos, I Pavlopoulos, P Pelucchi, F daCunha, JP and Policarpo, A Polivka, G Postma, H Rickenbach, R Roberts, BL Rozaki, E Ruf, T Sacks, L Sakeliou, L Sanders, P and Santoni, C Sarigiannis, K Schafer, M Schaller, LA and Schietinger, T Schopper, A Schune, P Soares, A Tauscher, L Thibault, C Touchard, F Touramanis, C Triantis, F and Troster, DA VanBeveren, E VanEijk, CWE Varner, G and Vlachos, S Weber, P Wigger, O Witzig, C Wolter, M and Yeche, C Zavrtanik, D Zimmerman, D

Abstract

{CP violation has been observed as a time-dependent rate asymmetry between the decays --> pi(0) pi(0) and K-0 --> pi(0) pi(0), where the neutral kaons are produced with definite and individually known strangeness in --> K(+)pi(-) or --> K(0)K(-)pi(+). A special technique for the data analysis has been developed. The values obtained for phi(00) and \textbackslash{}eta(00)\textbackslash{} are in agreement with those of previous measurements of CP violation.}

Published
1996

26. Tests of CPT symmetry and quantum mechanics with experimental data from CPLEAR

Author

Adler, R Angelopoulos, A Apostolakis, A Aslanides, E and Backenstoss, G Bee, CP Behnke, O Benelli, A Bertin, V and Blanc, F Bloch, P Carlson, P Carroll, M Carvalho, J and Cawley, E Charalambous, S Chardin, G Chertok, MB and Cody, A Danielsson, M Dejardin, M Derre, J Ealet, A and Eckart, B Eleftheriadis, C Evangelou, I Faravel, L and Fassnacht, P Felder, C FerreiraMarques, R Fetscher, W and Fidecaro, M Filipcic, A Francis, D Fry, J Gabathuler, E and Gamet, R Garreta, D Gerber, HJ Go, A Guyot, C and Haselden, A Hayman, PJ HenryCouannier, F Hollander, RW and Hubert, E JonAnd, K Kettle, PR Kochowski, C Kokkas, P and Kreuger, R LeGac, R Leimgruber, F Liolios, A and Machado, E Mandic, I Manthos, N Marel, G Mikuz, M and Miller, J Montanet, F Nakada, T Pagels, B Papadopoulos, I Pavlopoulos, P daCunha, JP Policarpo, A Polivka, G and Rickenbach, R Roberts, BL Ruf, T Sakeliou, L Sanders, P and Santoni, C Schafer, M Schaller, LA Schietinger, T and Schopper, A Schune, P Soares, A Tauscher, L Thibault, C and Touchard, F Touramanis, C Triantis, F VanBeveren, E and VanEijk, CWE Varner, G Vlachos, S Weber, P Wigger, O and Wolter, M Yeche, C Zavrtanik, D Zimmerman, D Ellis, J and Lopez, JL Mavromatos, NE Nanopoulos, DV

Subjects
High Energy Physics::Phenomenology, High Energy 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.

Published
1995

27. MEASUREMENT OF THE CP VIOLATION PARAMETER ETA(+-) USING TAGGED K-0 AND (K)OVER-BAR(0)

Author

ADLER, R ALHALEL, T ANGELOPOULOS, A APOSTOLAKIS, A and ASLANIDES, E BACKENSTOSS, G BEE, CP BEHNKE, O BENELLI, A and BENNET, J BERTIN, V BIENLEIN, JK BLANC, F BLOCH, P and BULA, C CARLSON, P CARROLL, M CARVALHO, J CAWLEY, E and CHARALAMBOUS, S CHARDALAS, M CHARDIN, G CHERTOK, MB and CODY, A DANIELSSON, M DEDOUSSIS, S DEJARDIN, M DERRE, J and DODGSON, M DUCLOS, J EALET, A ECKART, B and ELEFTHERIADIS, C EVANGELOU, I FARAVEL, L FASSNACHT, P and FAURE, JL FELDER, C FERREIRAMARQUES, R FETSCHER, W and FIDECARO, M FILIPCIC, A FRANCIS, D FRY, J FUGLESANG, C and GABATHULER, E GAMET, R GARRETA, D GERALIS, T GERBER, HJ GO, A GUMPLINGER, P GUYOT, C HARISON, PF and HASELDEN, A HAYMAN, PJ HENRYCOUANNIER, F HEYES, WG and HOLLANDER, RW HUBERT, E JANSSON, K JOHNER, HU JONAND, K and KETTLE, PR KOCHOWSKI, C KOKKAS, P KREUGER, R LAWRY, T LEGAC, R LEIMGRUBER, F LIOLIOS, A MACHADO, E and MALEY, P MANDIC, I MANTHOS, N MAREL, G MIKUZ, M and MILLER, J MONTANET, F NAKADA, T ONOFRE, A PAGELS, B and PAPADOPOULOS, I PAVLOPOULOS, P PELUCCHI, F DACUNHA, JP and POLICARPO, A POLIVKA, G POSTMA, H RICKENBACH, R ROBERTS, BL ROZAKI, E RUF, T SACKS, L SAKELIOU, L SANDERS, P and SANTONI, C SARIGIANNIS, K SCHAFER, M SCHALLER, LA and SCHIETINGER, T SCHOPPER, A SCHUNE, P SOARES, A TAUSCHER, L THIBAULT, C TOUCHARD, F TOURAMANIS, C TRIANTIS, F and TROSTER, DA VANBEVEREN, E VANEIJK, CWE VARNER, G and VLACHOS, S WEBER, P WIGGER, O WITZIG, C WOLTER, M and YECHE, C ZAVRTANIK, D ZIMMERMAN, D

Abstract

{The CP violation parameter eta(+-) is determined through the eigentime-dependent asymmetry in the rates of initially tagged K-0 and (K-0) over bar decaying to pi(+)pi(-). The obtained values are \textbackslash{}eta(+-)\textbackslash{} = (2.312 +/- 0.043(stat.) +/- 0.030(syst.) +/- 0.011(tau S)) x 10(-3) and phi(+-) = 42.7 degrees +/- 0.9(stat.)degrees +/- 0.6(syst.)degrees +/- 0.9(Delta m)degrees with Delta m = (527.4 +/- 2.9) x 10(7) (h) over bar s(-1) measured in the same experiment using the semileptonic decay channel.}

Published
1995

28. MEASUREMENT OF THE K-L-K-S MASS DIFFERENCE USING SEMILEPTONIC DECAYS OF TAGGED NEUTRAL KAONS

Author

ADLER, R ALHALEL, T ANGELOPOULOS, A APOSTOLAKIS, A and ASLANIDES, E BACKENSTOSS, G BEE, CP BEHNKE, O BENELLI, A and BENNET, J BERTIN, V BIENLEIN, JK BLANC, F BLOCH, P and BULA, C CARLSON, P CARROLL, M CARVALHO, J CAWLEY, E and CHARALAMBOUS, S CHARDALAS, M CHARDIN, G CHERTOK, MB and CODY, A DANIELSON, M DEDOUSSIS, S DEJARDIN, M DERRE, J and DODGSON, M DUCLOS, J EALET, A ECKART, B and ELEFTHERIADIS, C EVANGELOU, I FARAVEL, L FASSNACHT, P and FAURE, JL FELDER, C FERREIRAMARQUES, R FETSCHER, W and FIDECARO, M FILIPCIC, A FRANCIS, D FRY, J FUGLESANG, C and GABATHULER, E GAMET, R GARRETA, D GERALIS, T GERBER, HJ GO, A GUMPLINGER, P GUYOT, C HARRISON, PF and HASELDEN, A HAYMAN, PJ HENRYCOUANNIER, F HEYES, WG and HOLLANDER, RW HUBERT, E JANSSON, K JOHNER, HU JONAND, K and KETTLE, PR KOCHOWSKI, C KOKKAS, P KREUGER, R LAWRY, T LEGAC, R LEIMGRUBER, F LIOLIOS, A MACHADO, E and MALEY, P MANDIC, I MANTHOS, N MAREL, G MIKUZ, M and MILLER, J MONTANET, F NAKADA, T ONOFRE, A PAGELS, B and PAPADOPOULOS, I PAVLOPOULOS, P PELUCCHI, F DACUNHA, JP and POLICARPO, A POLIVKA, G POSTMA, H RICKENBACH, R ROBERTS, BL ROZAKI, E RUF, T SACKS, L SAKELIOU, L SANDERS, P and SANTONI, C SARIGIANNIS, K SCHAFER, M SCHALLER, LA and SCHIETINGER, T SCHOPPER, A SCHUNE, P SOARES, A TAUCHER, L THIBAULT, C TOUCHARD, F TOURAMANIS, C TRIANTIS, F and TROSTER, DA VANBEVEREN, E VANEIJK, CWE VARNER, G and VLACHOS, S WEBER, P WIGGER, O WITZIG, C WOLTER, M and YECHE, C ZAVRTANIK, D ZIMMERMAN, D

Subjects
High Energy Physics::Experiment, Nuclear Experiment
Abstract

We present a new measurement of the K-L-K-S mass difference (Delta m) using semileptonic decays of neutral kaons. The measurement yields Delta m = (0.5274 +/- 0.0029(stat.) +/- 0.0005(syst.)) x 10(10)(h) over bar/s.

Published
1995

29. Experiment to measure the Lamb shift in muonic hydrogen

Author

Pohl, R., Biraben, F., Conde, Can, Donche-Gay, C., Hansch, Tw, Hartmann, Fj, Hauser, P., Hughes, Vw, Huot, O., Paul Indelicato, Knowles, P., Kottmann, F., Liu, Yw, Mulhauser, F., Nez, F., Petitjean, C., Rabinowitz, P., Dos Santos, Jmf, Schaller, La, Schneuwly, H., Schott, W., Simons, Lm, Taqqu, D., Trehin, F., and Veloso, Jfca

Subjects
Physics::Instrumentation and Detectors
Abstract

The contribution of the root mean square (RMS) proton charge radius to the Lamb shift (2S–2P energy difference) in muonic hydrogen (µp) amounts to 2%. Apart from the uncertainty on this charge radius, theory predicts the Lamb shift with a precision on the ppm level. We are going to measure ?E (2 S1/2(F=1)–2 P3/2(F=2)) in a laser resonance experiment to a precision of 30 ppm (i.e., 10% of the natural linewidth) and to deduce the RMS proton charge radius with 10-3 relative accuracy, 20 times more precise than presently known. The most important requirement for the feasibility of such an experiment, namely the availability of a sufficient amount of long lived metastable µp atoms in the 2S state, has been investigated in a recent experiment at PSI. Our analysis shows that in the order of one percent of all muons stopped in low pressure hydrogen gas form a long lived µp(2S) with a lifetime of the order of 1 µs. The technical realization of our experiment involves a new high intensity low energy muon beam, an efficient low energy muon entrance detector, a randomly triggered 3 stage laser system providing the 0.5 mJ, 7 ns laser pulses at 6.02 µm wavelength, and a combination of a xenon gas proportional scintillation chamber (GPSC) and a microstrip gas chamber (MSGC) with a CsI coated surface to detect the 2 keV X rays from theµp(2P ? 1S) transition.

30. The muonic hydrogen Lamb shift experiment at PSI

Author

Kottmann, F., Amir, W., Biraben, F., Conde, Can, Dhawan, S., Hansch, Tw, Hartmann, Fj, Hughes, Vw, Huot, O., Paul Indelicato, Julien, L., Knowles, P., Kazamias, S., Liu, Yw, Mulhauser, F., Nez, F., Pohl, R., Rabinowitz, P., Dos Santos, Jmf, Schaller, La, Schneuwly, H., Schott, W., Taqqu, D., and Veloso, Jfca

Subjects
Physics::Instrumentation and Detectors, Physics::Atomic Physics
Abstract

A measurement of the 2S Lamb shift in muonic hydrogen (µ-p) is being prepared at the Paul Scherrer Institute (PSI). The goal of the experiment is to measure the energy difference ?E(25 P 3/2-23 S 1/2) by laser spectroscopy (?˜6µm) to a precision of 30 ppm and to deduce the root mean square (rms) proton charge radius with 10-3 relative accuracy, 20 times more precise than presently known. An important prerequisite to this experiment is the availability of long-lived µp2S -atoms. A 2S-lifetime of ~1 µs – sufficiently long to perform the laser experiment – at H2 gas pressures of 1–2 hPa was deduced from recent measurements of the collisional 2S-quenching rate. A new low-energy negative muon beam yields an order of magnitude more muon stops in a small low-density gas volume than a conventional cloud muon beam. A stack of ultra-thin carbon foils is the key element of a fast detector for keV-muons. The development of a 2 keV X-ray detector and a 3-stage laser system providing 0.5 mJ laser pulses at 6 µm is on the way.

31. The 2S Lamb shift in muonic hydrogen and the proton rms charge radius

Author

Antognini, A., Fernando Amaro, Biraben, F., Brauch, U., Cardoso, Jmr, Conde, Can, Dax, A., Dhawan, S., Fernandes, Lmp, Giesen, A., Hansch, Tw, Indelicato, P., Julien, L., Knowles, Pe, Kottmann, F., Liu, Yw, Lopes, Jam, Ludhova, L., Monteiro, Cmb, Mulhauser, F., Nez, F., Pohl, R., Rabinowitz, P., Dos Santos, Jmf, Schaller, La, Schwob, C., Stolzenburg, C., Taqqu, D., Veloso, Jfca, Grzonka, D., Czyzykiewicz, R., Oelert, W., Rozek, T., and Winter, P.

32. Laser spectroscopy of muonic deuterium.

Author

Pohl R, Nez F, Fernandes LM, Amaro FD, Biraben F, Cardoso JM, Covita DS, Dax A, Dhawan S, Diepold M, Giesen A, Gouvea AL, Graf T, Hänsch TW, Indelicato P, Julien L, Knowles P, Kottmann F, Le Bigot EO, Liu YW, Lopes JA, Ludhova L, Monteiro CM, Mulhauser F, Nebel T, Rabinowitz P, dos Santos JM, Schaller LA, Schuhmann K, Schwob C, Taqqu D, Veloso JF, and Antognini A

Abstract

The deuteron is the simplest compound nucleus, composed of one proton and one neutron. Deuteron properties such as the root-mean-square charge radius rd and the polarizability serve as important benchmarks for understanding the nuclear forces and structure. Muonic deuterium μd is the exotic atom formed by a deuteron and a negative muon μ(-). We measured three 2S-2P transitions in μd and obtain r(d) = 2.12562(78) fm, which is 2.7 times more accurate but 7.5σ smaller than the CODATA-2010 value r(d) = 2.1424(21) fm. The μd value is also 3.5σ smaller than the r(d) value from electronic deuterium spectroscopy. The smaller r(d), when combined with the electronic isotope shift, yields a "small" proton radius r(p), similar to the one from muonic hydrogen, amplifying the proton radius puzzle., (Copyright © 2016, American Association for the Advancement of Science.)

Published
2016
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33. Proton structure from the measurement of 2S-2P transition frequencies of muonic hydrogen.

Author

Antognini A, Nez F, Schuhmann K, Amaro FD, Biraben F, Cardoso JM, Covita DS, Dax A, Dhawan S, Diepold M, Fernandes LM, Giesen A, Gouvea AL, Graf T, Hänsch TW, Indelicato P, Julien L, Kao CY, Knowles P, Kottmann F, Le Bigot EO, Liu YW, Lopes JA, Ludhova L, Monteiro CM, Mulhauser F, Nebel T, Rabinowitz P, dos Santos JM, Schaller LA, Schwob C, Taqqu D, Veloso JF, Vogelsang J, and Pohl R

Abstract

Accurate knowledge of the charge and Zemach radii of the proton is essential, not only for understanding its structure but also as input for tests of bound-state quantum electrodynamics and its predictions for the energy levels of hydrogen. These radii may be extracted from the laser spectroscopy of muonic hydrogen (μp, that is, a proton orbited by a muon). We measured the 2S(1/2)(F=0)-2P(3/2)(F=1) transition frequency in μp to be 54611.16(1.05) gigahertz (numbers in parentheses indicate one standard deviation of uncertainty) and reevaluated the 2S(1/2)(F=1)-2P(3/2)(F=2) transition frequency, yielding 49881.35(65) gigahertz. From the measurements, we determined the Zemach radius, r(Z) = 1.082(37) femtometers, and the magnetic radius, r(M) = 0.87(6) femtometer, of the proton. We also extracted the charge radius, r(E) = 0.84087(39) femtometer, with an order of magnitude more precision than the 2010-CODATA value and at 7σ variance with respect to it, thus reinforcing the proton radius puzzle.

Published
2013
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34. The size of the proton.

Author

Pohl R, Antognini A, Nez F, Amaro FD, Biraben F, Cardoso JM, Covita DS, Dax A, Dhawan S, Fernandes LM, Giesen A, Graf T, Hänsch TW, Indelicato P, Julien L, Kao CY, Knowles P, Le Bigot EO, Liu YW, Lopes JA, Ludhova L, Monteiro CM, Mulhauser F, Nebel T, Rabinowitz P, Dos Santos JM, Schaller LA, Schuhmann K, Schwob C, Taqqu D, Veloso JF, and Kottmann F

Abstract

The proton is the primary building block of the visible Universe, but many of its properties-such as its charge radius and its anomalous magnetic moment-are not well understood. The root-mean-square charge radius, r(p), has been determined with an accuracy of 2 per cent (at best) by electron-proton scattering experiments. The present most accurate value of r(p) (with an uncertainty of 1 per cent) is given by the CODATA compilation of physical constants. This value is based mainly on precision spectroscopy of atomic hydrogen and calculations of bound-state quantum electrodynamics (QED; refs 8, 9). The accuracy of r(p) as deduced from electron-proton scattering limits the testing of bound-state QED in atomic hydrogen as well as the determination of the Rydberg constant (currently the most accurately measured fundamental physical constant). An attractive means to improve the accuracy in the measurement of r(p) is provided by muonic hydrogen (a proton orbited by a negative muon); its much smaller Bohr radius compared to ordinary atomic hydrogen causes enhancement of effects related to the finite size of the proton. In particular, the Lamb shift (the energy difference between the 2S(1/2) and 2P(1/2) states) is affected by as much as 2 per cent. Here we use pulsed laser spectroscopy to measure a muonic Lamb shift of 49,881.88(76) GHz. On the basis of present calculations of fine and hyperfine splittings and QED terms, we find r(p) = 0.84184(67) fm, which differs by 5.0 standard deviations from the CODATA value of 0.8768(69) fm. Our result implies that either the Rydberg constant has to be shifted by -110 kHz/c (4.9 standard deviations), or the calculations of the QED effects in atomic hydrogen or muonic hydrogen atoms are insufficient.

Published
2010
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35. Measurement of the kaonic hydrogen x-ray spectrum.

Author

Beer G, Bragadireanu AM, Cargnelli M, Curceanu-Petrascu C, Egger JP, Fuhrmann H, Guaraldo C, Iliescu M, Ishiwatari T, Itahashi K, Iwasaki M, Kienle P, Koike T, Lauss B, Lucherini V, Ludhova L, Marton J, Mulhauser F, Ponta T, Schaller LA, Seki R, Sirghi DL, Sirghi F, and Zmeskal J

Abstract

The DEAR (DAPhiNE exotic atom research) experiment measured the energy of x rays emitted in the transitions to the ground state of kaonic hydrogen. The measured values for the shift epsilon and the width Gamma of the 1s state due to the K(-)p strong interaction are epsilon(1s)=-193 +/- 37 (stat) +/- 6 (syst) eV and Gamma(1s)=249 +/- 111 (stat) +/- 30 (syst) eV, the most precise values yet obtained. The pattern of the kaonic hydrogen K-series lines, K(alpha), K(beta), and K(gamma), was disentangled for the first time.

Published
2005
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