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17 results on '"Vaneijk, C. W. E."'

1. Measurement of eta+- with the CPLEAR experiment

Author

Adler, R., Alhalel, T., 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., Carvalho, J., Cawley, E., Charalambous, S., Chardin, G., Chertok, M. B., Cody, A., Danielsson, M., Dejardin, H., Derre, J., Ealet, A., Eckart, B., Eleftheriadis, C., Evangelou, I., Faravel, L., Fassnacht, P., Felder, C., FerreiraMarques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Gabathuler, E., Gamet, R., Garreta, D., Gerber, H. J., Go, A., Guyot, C., Haselden, A., Hayman, P. J., HenryCouannier, F., Hollander, R. W., Hubert, E., JonAnd, K., Kettle, P. R., Kochowski, C., Kokkas, P., Kreuger, R., LeGac, 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., daCunha, J. P., 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., VanBeveren, E., VanEijk, C. W. E., Vlachos, S., Weber, P., Wigger, O., Wolter, M., Yeche, C., Zavrtanik, D., and Zimmerman, D.

Abstract

The CPLEAR experiment at CERN uses time-dependent decay-rate asymmetries between K-0 and (K) over bar(0) to measure eta(+-). The analysis and the systematic errors are discussed. The preliminary results from all our data are phi(+-) = 43.5 degrees +/- 0.5(stat)degrees +/- 0.5(syst)+/-0.4(Delta m) and \eta(+-)\ = (2.316 +/- 0.025(stat) +/- 0.028(syst) +/- 0.009(tau S)) x 10(-3). The dominant part in the systematic error of phi(+-) is due to the regeneration correction. A dedicated experiment was performed to reduce this error considerably. Nuclear Physics B

Published
1997

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

Author

Adler, R., 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., 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., FerreiraMarques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Gabathuler, E., Gamet, R., Garreta, D., Gerber, H. J., Go, A., Guyot, C., Haselden, A., Hayman, P. J., HenryCouannier, F., Hollander, R. W., Hubert, E., JonAnd, K., Kettle, P. R., Kochowski, C., Kokkas, P., Kreuger, R., LeGac, R., Leimgruber, F., Liolios, A., Machado, E., Mandic, I., Manthos, N., Marel, G., Mikuz, M., Miller, J., Montanet, F., Muller, A., Nakada, T., Pagels, B., Papadopoulos, I., Pavlopoulos, P., daCunha, J. P., 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., VanBeveren, E., VanEijk, C. W. E., Vlachos, S., Weber, P., Wigger, O., Wolter, M., Yeche, C., Zavrtanik, D., and 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. Physics Letters B

Published
1997

3. Results of CPLEAR

Author

Adler, R., Alhalel, T., 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., 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., FerreiraMarques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Gabathuler, E., Garnet, R., Garreta, D., Gerber, H. J., Go, A., Guyot, C., Haselden, A., Hayman, P. J., HenryCouannier, F., Hollander, R. W., Kettle, P. R., Kochowski, C., Kokkas, P., Kreuger, R., LeGac, 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., daCunha, J. P., 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., VanBeveren, E., VanEijk, C. W. E., Vlachos, S., Weber, P., Wigger, O., Wolter, M., Yeche, C., Zavrtanik, D., and Zimmerman, D.

Abstract

The CPLEAR experiment uses tagged K-0 and (K) over bar K-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. Nuclear Physics B

Published
1997

4. Upper limit for the branching ratio of K-s->e(+)e(-) decay

Author

Adler, R., Alhalel, T., 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., 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., FerreiraMarques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Gabathuler, E., Gamet, R., Garreta, D., Gerber, H. J., Go, A., Guyot, C., Haselden, A., Hayman, P. J., HenryCouannier, F., Hollander, R. W., Hubert, E., JonAnd, K., Kettle, P. R., Kochowski, C., Kokkas, P., Kreuger, R., LeGac, 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., daCunha, J. P., 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., VanBeveren, E., VanEijk, C. W. E., Vlachos, S., Weber, P., Wigger, O., Wolter, M., Yeche, C., Zavrtanik, D., and Zimmerman, D.

Abstract

A measurement of the branching ratio for K-s --> e(+)e(-) decay was performed with the CPLEAR detector at LEAR. Full event reconstruction together with calorimeter e/pi separation allowed for powerful background rejection and high signal acceptance. Analysis of data taken up to 1994 yields the result: Br(K-s --> e(+)e(-)) < 4.2.10(-7) (90% CL). Nuclear Physics B

Published
1997

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

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., Carvalho, J., Cawley, E., Charalambous, S., Chardin, G., Chertok, M. B., Cody, A., Danielsson, M., Dejardin, M., Derre, J., Ealet, A., Eleftheriadis, C., Evangelou, I., Faravel, L., FerreiraMarques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Gabathuler, E., Gamet, R., Garreta, D., Gerber, H. J., Go, A., Haselden, A., Hayman, P. J., HenryCouannier, F., Hollander, R. W., Hubert, E., JonAnd, K., Kettle, P. R., Kokkas, P., Kreuger, R., LeGac, R., Leimgruber, F., Liolios, A., Machado, E., Mandic, I., Manthos, N., Marel, G., Mikuz, M., Miller, J., Montanet, F., Muller, A., Nakada, T., Pagels, B., Papadopoulos, I., Pavlopoulos, P., daCunha, J. P., Policarpo, A., Polivka, G., Rickenbach, R., Roberts, B. L., Ruf, T., Sakeliou, L., Sanders, P., Schafer, M., Schaller, L. A., Schietinger, T., Schopper, A., Soares, A., Auscher, L., Thibault, C., Touchard, F., Touramanis, C., Triantis, F., VanBeveren, E., VanEijk, C. W. E., Vlachos, S., 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. Physics Letters B

Published
1997

6. The CPLEAR detector at CERN

Author

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

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. Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment

Published
1996

7. 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., Aslanides, E., Backenstoss, G., Bee, C. P., Behnke, O., Benelli, A., Bennet, J., Bertin, V., Bienlein, J. K., Blanc, F., Bloch, P., Bula, C., 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., Dodgson, M., Duclos, J., Ealet, A., Eckart, B., Eleftheriadis, C., Evangelou, I., Faravel, L., Fassnacht, P., Faure, J. L., Felder, C., FerreiraMarques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Fuglesang, C., Gabathuler, E., Gamet, R., Garreta, D., Geralis, T., Gerber, H. J., Go, A., Gumplinger, P., Guyot, C., Harrison, P. F., Haselden, A., Hayman, P. J., HenryCouannier, F., Heyes, W. G., Hollander, R. W., Hubert, E., Jansson, K., Johner, H. U., JonAnd, K., Kettle, P. R., Kochowski, C., Kokkas, P., Kreuger, R., Lawry, T., LeGac, R., Leimgruber, F., Liolios, A., Machado, E., Maley, P., Mandic, I., Manthos, N., Marel, G., Mikuz, M., Miller, J., Montanet, F., Nakada, T., Onofre, A., Pagels, B., Papadopoulos, I., Pavlopoulos, P., Pelucchi, F., daCunha, J. P., Policarpo, A., Polivka, G., Postma, H., Rickenbach, R., Roberts, B. L., Rozaki, E., Ruf, T., Sacks, L., Sakeliou, L., Sanders, P., Santoni, C., Sarigiannis, K., Schafer, M., Schaller, L. A., Schietinger, T., Schopper, A., Schune, P., Soares, A., Tauscher, L., Thibault, C., Touchard, F., Touramanis, C., Triantis, F., Troster, D. A., VanBeveren, E., VanEijk, C. W. E., Varner, G., Vlachos, S., Weber, P., Wigger, O., Witzig, C., Wolter, M., Yeche, C., Zavrtanik, D., and 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 \eta(00)\ are in agreement with those of previous measurements of CP violation. Zeitschrift Fur Physik C-Particles and Fields

Published
1996

8. 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., Aslanides, E., Backenstoss, G., Bee, C. P., Behnke, O., Benelli, A., Bertin, V., Blanc, F., Bloch, P., Bula, C., 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., FerreiraMarques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Gabathuler, E., Gamet, R., Garreta, D., Gerber, H. J., Go, A., Guyot, C., Haselden, A., Hayman, P. J., HenryCouannier, F., Hollander, R. W., Hubert, E., JonAnd, K., Kettle, P. R., Kochowski, C., Kokkas, P., Kreuger, R., LeGac, R., Leimgruber, F., Liolios, A., Machado, E., Mandic, I., Manthos, N., Marel, G., Mikuz, M., Miller, J., Montanet, F., Nakada, T., Onofre, A., Pagels, B., Papadopoulos, I., Pavlopoulos, P., daCunha, J. P., Policarpo, A., Polivka, G., Rickenbach, R., Roberts, B. L., Rozaki, E., Ruf, T., 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., Tourmanis, C., Triantis, F., VanBeveren, E., VanEijk, C. W. E., Varner, G., Vlachos, S., Weber, P., Wigger, O., Wolter, M., Yeche, C., Zavrtanik, D., and Zimmerman, D.

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 \eta(+ -)\, 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. Nuovo Cimento Della Societa Italiana Di Fisica a-Nuclei Particles and Fields

Published
1996

9. CP, T, and CPT violation in the neutral-kaon system in the CPLEAR experiment

Author

Adler, R., Alhalel, T., Angelopoulos, A., Apostolakis, A., Aslanides, E., Backenstoss, G., Bee, C. P., Behnke, O., Benelli, A., Bertin, V., Blanc, F., Bloch, P., Bula, C., 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., FerreiraMarques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Gabathuler, E., Gamet, R., Garreta, D., Gerber, H. J., Go, A., Guyot, C., Haselden, A., Hayman, P. J., HenryCouannier, F., Hollander, R. W., Hubert, E., JonAnd, K., Kettle, P. R., Kochowski, C., Kokkas, P., Kreuger, R., LeGac, R., Leimgruber, F., Liolios, A., Machado, E., Mandic, I., Manthos, N., Marel, G., Mikuz, M., Miller, J., Montanet, F., Nakada, T., Onofre, A., Pagels, B., Papadopoulos, I., Pavlopoulos, P., daCunha, J. P., Policarpo, A., Polivka, G., Rickenbach, R., Roberts, B. L., Rozaki, E., Ruf, T., 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., VanBeveren, E., VanEijk, C. W. E., Varner, G., Vlachos, S., Weber, P., Wigger, O., Wolter, M., Yeche, C., Zavrtanik, D., and Zimmerman, D.

Abstract

The CPLEAR experiment at CERN studies CP, T, and CPT symmetries in the neutral-kaon system by measuring the time-dependent decay rate asymmetries of initially pure K-0 and states. Results on eta(+-), eta(+-0), Delta m, and x are reported. as well as on the first direct test of T violation and CPT invariance in K-0- oscillations. Our results are consistent with CPT invariance and allow for an improved limit on the K-0- mass difference. Physics of Atomic Nuclei

Published
1996

10. Evaluation of the phase of the CP violation parameter eta(+-) and the K-L-K-S mass difference from a correlation analysis of different experiments

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., FerreiraMarques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Gabathuler, E., Gamet, R., Garreta, D., Gerber, H. J., Go, A., Guyot, C., Haselden, A., Hayman, P. J., HenryCouannier, F., Hollander, R. W., Hubert, E., JonAnd, K., Kettle, P. R., Kochowski, C., Kokkas, P., Kreuger, R., LeGac, 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., daCunha, J. P., 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., VanBeveren, E., VanEijk, C. W. E., Varner, G., Vlachos, S., Weber, P., Wigger, O., Wolter, M., Yeche, C., Zavrtanik, D., and Zimmerman, D.

Abstract

The best estimation of phi+- (the phase of the CP violation parameter eta+-) and of Delta m (the K-L - K-S mass difference) is obtained by averaging the results of different experiments, taking into account the different correlation, existing for most of the experiments, between the measurement of phi+- and hm. Including the recent measurements, we obtain the average values (Delta m) = (530.7 +/- 1.3) x 10(7) and (phi+-) = 43.82 degrees +/- 0.63 degrees. This value of phi+- is in good agreement with the superweak phase phi(SW) = 43.49 degrees +/- 0.08 degrees. Physics Letters B

Published
1996

11. 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., Aslanides, E., Backenstoss, G., Bee, C. P., Behnke, O., Benelli, A., Bennet, J., Bertin, V., Bienlein, J. K., Blanc, F., Bloch, P., Bula, C., 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., Dodgson, M., Duclos, J., Ealet, A., Eckart, B., Eleftheriadis, C., Evangelou, I., Faravel, L., Fassnacht, P., Faure, J. L., Felder, C., Ferreiramarques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Fuglesang, C., Gabathuler, E., Gamet, R., Garreta, D., Geralis, T., Gerber, H. J., Go, A., Gumplinger, P., Guyot, C., Harison, P. F., Haselden, A., Hayman, P. J., Henrycouannier, F., Heyes, W. G., Hollander, R. W., Hubert, E., Jansson, K., Johner, H. U., Jonand, K., Kettle, P. R., Kochowski, C., Kokkas, P., Kreuger, R., Lawry, T., Legac, R., Leimgruber, F., Liolios, A., Machado, E., Maley, P., Mandic, I., Manthos, N., Marel, G., Mikuz, M., Miller, J., Montanet, F., Nakada, T., Onofre, A., Pagels, B., Papadopoulos, I., Pavlopoulos, P., Pelucchi, F., Dacunha, J. P., Policarpo, A., Polivka, G., Postma, H., Rickenbach, R., Roberts, B. L., Rozaki, E., Ruf, T., Sacks, L., Sakeliou, L., Sanders, P., Santoni, C., Sarigiannis, K., Schafer, M., Schaller, L. A., Schietinger, T., Schopper, A., Schune, P., Soares, A., Tauscher, L., Thibault, C., Touchard, F., Touramanis, C., Triantis, F., Troster, D. A., Vanbeveren, E., Vaneijk, C. W. E., Varner, G., Vlachos, S., Weber, P., Wigger, O., Witzig, C., Wolter, M., Yeche, C., Zavrtanik, D., and 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 \eta(+-)\ = (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. Physics Letters B

Published
1995

12. INCLUSIVE MEASUREMENT OF (P)OVER-BAR ANNIHILATION AT REST IN GASEOUS-HYDROGEN TO FINAL-STATES CONTAINING RHO AND F(2)

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, C., 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., Ferreiramarques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Fuglesang, C., Gabathuler, E., Gamet, R., Garreta, D., Geralis, T., Gerber, H. J., Go, A., Gumplinger, P., Guyot, C., Harrison, P. F., Haselden, A., Hayman, P. J., Henrycouannier, F., Heyes, W. G., Hollander, R. W., Jansson, K., Johner, H. U., Jonand, K., Kerek, A., Kern, J., Kettle, P. R., Kochowski, C., Kokkas, P., Kreuger, R., Lawry, T., Legac, R., Liolios, A., Machado, E., Maley, P., Mandic, I., Manthos, N., Marel, G., Mikuz, M., Miller, J., Montanet, F., Nakada, T., Onofre, A., Pagels, B., Pavlopoulos, P., Pelucchi, F., Dacunha, J. P., Policarpo, A., Polivka, G., Postma, H., Rickenbach, R., Roberts, B. L., Rozaki, E., Ruf, T., Sacks, L., 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., Troster, D. A., Vanbeveren, E., Vaneijk, C. W. E., Varner, G., Vlachos, S., Weber, P., Wigger, O., Witzig, C., Wolter, M., Yeche, C., Zavrtanik, D., and Zimmerman, D.

Abstract

Antiproton annihilation at rest in gaseous hydrogen (16 bar pressure) to the final states rho(770)X and f(2)(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 = pi(0), 2 pi(0), 3 pi(0), w in the rho case,and for X = pi(0), eta in the f(2) case. The annihilation channel (p) over bar p --> rho 3 pi(0) has not been measured before. The fraction of P-wave annihilation is deduced from the ratio f(2) pi(0)/rho pi(0) to be 0.38 +/- 0.07, in good agreement with the result previously obtained by CPLEAR from the ratio K+K-/pi(+)pi(-). Zeitschrift Fur Physik C-Particles and Fields

Published
1995

13. RECENT RESULTS OF THE CPLEAR EXPERIMENT

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, C., 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., Duclos, J., Ealet, A., Eckart, B., Eleftheriadis, C., Evangelou, I., Faravel, L., Fassnacht, P., Faure, J. L., Felder, C., Ferreiramarques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Fuglesang, C., Gabathuller, E., Gamet, R., Garreta, D., Geralis, T., Gerber, H. J., Go, A., Gumplinger, P., Guyot, C., Harrison, P. F., Haselden, A., Hayman, P. J., Henrycouannier, F., Heyes, W. G., Hollander, R. W., Hubert, E., Jansson, K., Johner, H. U., Jonand, K., Kerek, A., Kettle, P. R., Kochowski, C., Kokkas, P., Kreuger, R., Lawry, T., Legac, R., Liolios, A., Machado, E., Maley, P., Mandic, I., Manthos, N., Marel, G., Mikuz, M., Miller, J., Montanet, F., Nakada, T., Onofre, A., Pagels, B., Pavlopoulos, P., Pelucchi, F., Dacunhas, J. P., Policarpo, A., Polivka, G., Postma, H., Rickenbach, R., Roberts, B. L., Rozaki, E., Ruf, T., Sacks, L., 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., Troster, D. A., Vanbeveren, E., Vaneijk, C. W. E., Vlachos, S., Weber, P., Wigger, O., Witzig, C., Wolter, M., Yeche, C., Zavrtanik, D., and Zimmerman, D.

Abstract

Physics of Atomic Nuclei

Published
1994

14. BOSE-EINSTEIN CORRELATIONS IN P(P)OVER-BAR ANNIHILATIONS AT REST

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, C., 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., Ferreiramarques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Fuglesang, C., Gabathuler, E., Gamet, R., Garreta, D., Geralis, T., Gerber, H. J., Go, A., Gumplinger, P., Guyot, C., Harrison, P. F., Haselden, A., Hayman, P. J., Henrycouannier, F., Heyes, W. G., Hollander, R. W., Jansson, K., Johner, H. U., Jonand, K., Kerek, A., Keren, J., Kettle, P. R., Kochowski, C., Kokkas, P., Kreuger, R., Lawry, T., Legac, R., Liolios, A., Machado, E., Maley, P., Mandic, I., Manthos, N., Marel, G., Mikuz, M., Miller, J., Montanet, F., Nakada, T., Onofre, A., Pagels, B., Pavlopoulos, P., Pelucchi, F., Dacunha, J. P., Policarpo, A., Polivka, G., Postma, H., Rickenbach, R., Roberts, B. L., Rozaki, E., Ruf, T., Sacks, L., 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., Troster, D. A., Vanbeveren, E., Vaneijk, C. W. E., Varner, G., Vlachos, S., Weber, P., Wigger, O., Witzig, C., Wolter, M., Yeche, C., Zavrtanik, D., and Zimmerman, D.

Abstract

Two-charged-pion correlations were studied in ppBAR (--> 2pi+2pi-npi0, n greater-than-or-equal-to 0) annihilations at rest with the CPLEAR detector at the Low-Energy Antiproton Ring (LEAR) A strong enhancement was found in the production of pairs of like-sign pions with a small value of the relative four-momentum Q, with respect to pairs of unlike-sign pions. The observed enhancement was interpreted as a consequence of the Bose-Einstein symmetrization of the two-pion wave function. The data are well represented by a correlation function parametrized as a double-Gaussian; an exponential parametrization is also statistically acceptable. The value of the correlation strength is found to be > 1. The high-quality large data samples together with the ability for K+/- identification and final-state separation allowed the study of systematic effects impacting on the Q dependence of the correlation function and on the extracted space parameters of the pion sources. Zeitschrift Fur Physik C-Particles and Fields

Published
1994

15. 2 PION BOSE-EINSTEIN CORRELATIONS IN (P)OVER-BAR-P ANNIHILATIONS AT REST

Author

Adler, R., Alhalel, T., Angelopoulos, A., Apostolakis, A., Aslanides, E., Backenstoss, G., Bee, C. P., Bennet, J., Bertin, V., Bienlein, J. K., Bloch, P., Bula, C., Carlson, P., Carvalho, J., Cawley, E., Charalambous, S., Chardalas, M., Chardin, G., Danielsson, M., 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., Ferreiramarques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J. R., Fuglesang, C., Gabathuler, E., Gamet, R., Garreta, D., Geralis, T., Gerber, H. J., Go, A., Gumplinger, P., Guyot, C., Harrison, P. F., Hayman, P. J., Heyes, W. G., Hollander, R. W., Jansson, K., Johner, H. U., Jonand, K., Kerek, A., Kern, J., Kettle, P. R., Kochowski, C., Kokkas, P., Krueger, R., Lawry, T., Legac, R., Liolios, A., Machado, E., Maley, P., Mandic, I., Manthos, N., Marel, G., Mikuz, M., Miller, J. P., Montanet, F., Nakada, T., Onofre, A., Pagels, B., Pavlopoulos, P., Pelucchi, F., Dacunha, J. P., Policarpo, A., Polivka, G., Postma, H., Rickenbach, R., Roberts, B. L., Rozaki, E., Ruf, T., Sacks, L., Sakeliou, L., Sanders, P., Santoni, C., Sarigiannis, K., Schafer, M., Schaller, L., Schopper, A., Schune, P., Soares, A., Szilagyi, S., Tauscher, L., Thibault, C., Touchard, F., Touramanis, C., Triantis, F., Troester, D. A., Vanbeveren, E., Vandenputte, M., Vaneijk, C. W. E., Varner, G., Vlachos, S., Weber, P., Wigger, O., Witzig, C., Wolter, O., Yeche, C., Zavrtanik, D., and Zimmerman, D.

Abstract

Bose-Einstein (BE) correlations between like-sign charged pions were studied in ppBAR annihilations at rest into four-prong events, using data taken with the CPLEAR detector at LEAR (CERN). A strong enhancement was found in the production of pairs of like-sign pions of similar momenta, with respect to the pairs of unlike-sign pions. The observed BE-enhancement was used to extract the values for the strength lambda of the effect and the radius r of the pion emitting source. The extracted value of lambda>1 is of relevant importance and clearly does not depend on the assumed parametrization of the correlation function. The influence of the normalization and fitting procedure, the detector resolution, the resonances production and decay and the neutral-pion multiplicity cuts, on the size of the pion source and the strength of the effect was investigated. Nuclear Physics A

Published
1993

16. 1ST DETERMINATION OF CP VIOLATION PARAMETERS FROM K(0)-(K)BAR-0 DECAY ASYMMETRY

Author

Adler, R., Alhalel, T., Angelopoulos, A., Apostolakis, A., Aslanides, E., Backenstoss, G., Bee, C. P., Bennet, J., Bienlein, J. K., Bloch, P., Bula, C., Burgun, G., Carlson, P., Carvalho, J., Cawley, E., Charalambous, S., Chardalas, M., Chardin, G., Cobbaert, H., Dedoussis, S., Dejardin, M., Derre, J., Dodgson, M., Dousse, J. C., Duclos, J., Ealet, A., Eckart, B., Faravel, L., Fassnacht, P., Faure, J. L., Felder, C., Ferreiramarques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J. R., Fuglesang, C., Gabathuler, E., Gamet, R., Garreta, D., Geralis, T., Gerber, H. J., Go, A., Gumplinger, P., Guyot, C., Harrison, P. F., Hayman, P. J., Heyes, W. G., Hollander, R. W., Jansson, K., Johner, H. U., Jonand, K., Kerek, A., Kern, J., Kettle, P. R., Kochowski, C., Kokkas, P., Kreuger, R., Lawry, T., Legac, R., Machado, E., Maley, P., Manthos, N., Marel, G., Mikuz, M., Miller, J. P., Montanet, F., Nakada, T., Onofre, A., Pagels, B., Pavlopoulos, P., Pelucchi, F., Dacunha, J. P., Policarpo, A., Polivka, G., Postma, H., Rickenbach, R., Roberts, B. L., Rozaki, E., Ruf, T., Sacks, L., Sakeliou, L., Sanders, P., Santoni, C., Sarigiannis, K., Schafer, M., Schaller, L., Schopper, A., Schune, P., Seljak, U., Szilagyi, S., Tauscher, L., Thibault, C., Touchard, F., Touramanis, C., Triantis, F., Troester, D. A., Vanbeveren, E., Vandenputte, M., Vaneijk, C. W. E., Varner, G., Vlachos, S., Weber, P., Witzig, C., Yeche, C., Zavrtanik, D., and Zimmerman, D.

Abstract

We report the first determination of CP violation parameters from particle-antiparticle asymmetry in the decay of neutral kaons into two charged pions. Observation of such an asymmetry is direct proof of CP violation. A fit to the asymmetry enabled a determination of the parameter-eta+- to be made, yielding the result \eta+-\ = [2.32 +/- 0.14 (stat. ) +/- 0.03 (syst.)] X 10(-3) and phi+- = 42.3-degrees +/- 4.4-degrees (stat.) +/- 0.4-degrees (syst. ), with an additional uncertainty of +/-1.0-degrees due to the error on the present published value of DELTA-m, the K(L)0-K(S)0 mass difference. The magnitudes of both statistical and systematic errors will be significantly reduced in the future. Physics Letters B

Published
1992

17. 1ST RESULTS OF THE CPLEAR EXPERIMENT AT CERN - STUDY OF CP VIOLATION AND CPT TESTS USING K0-(K)BAR0 INTERFEROMETRY

Author

Adler, R., Alhalel, T., Angelopoulos, A., Apostolakis, A., Aslanides, E., Backenstoss, G., Bee, C. P., Bennet, J., Bloch, P., Bula, C., Burgun, G., Carlson, P., Carvalho, J., Chardalas, M., Charalambous, S., Cobbaert, H., Dedoussis, S., Dejardin, M., Derre, J., Dodgson, M., Dousse, J. C., Duclos, J., Ealet, A., Eckart, B., Farevel, L., Fassnacht, P., Faure, J. L., Felder, C., Ferreiramarques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Fuglesang, C., Garathuler, E., Gamet, R., Garreta, D., Geralis, T., Gerber, H. J., Go, A., Gumplinger, P., Guyot, C., Harrison, P. F., Hayman, P. J., Heyes, W. G., Hollander, R. W., Johner, H. U., Jonand, K., Jansson, K., Kerek, A., Kern, J., Kettle, P. R., Kochowski, C., Kokkas, P., Kossionides, E., Kreuger, R., Lawry, T., Legac, R., Machado, E., Maley, P., Manthos, N., Marel, G., Marotte, P., Mikuz, M., Miller, J., Montanet, F., Nakada, T., Onofre, A., Pagels, B., Paradelis, T., Pavlopoulos, P., Pelucchi, F., Dacunha, J. P., Policarpo, A., Postma, H., Rickenbach, R., Roberts, B. L., Rozaki, E., Ruf, T., Sacks, L., Sakeliou, L., Sanders, P., Sarigiannis, K., Schaller, L., Schopper, A., Schune, P., Seliak, U., Szilagyi, S., Tauscher, L., Thibault, C., Touchard, F., Touramanis, C., Triantis, F., Troester, D. A., Vanbeveren, E., Vandenputte, M., Vaneijk, C. W. E., Varner, G., Vlachos, S., Weber, P., Witzig, C., Yeche, C., Zavrtanik, D., and Zimmerman, D.

Abstract

The CPLEAR experiment at CERN reports the first observation of the K0-K0BAR time-dependent decay rate asymmetry in the pi+-pi- decay channel. The aim of the experiment, the behavior of the detector, and the first physics results are presented. Soviet Journal of Nuclear Physics-Ussr

Published
1992

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