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3 results on '"O. Wigger"'

1. First direct observation of time-reversal violation

Author

R. Le Gac, J. R. Fry, H.-J. Gerber, P. Bloch, T. Nakada, F. Montanet, O. Behnke, C. Eleftheriadis, M.B. Chertok, E. Gabathuler, R. Rickenbach, F. Leimgruber, A. Schopper, Kerstin Jon-And, Nikolaos Manthos, P. Pavlopoulos, M. Mikuž, M. Fidecaro, A. Apostolakis, W. Fetscher, P.J. Hayman, R. Gamet, P. Weber, P. Bargassa, C. Touramanis, A. Muller, Ioannis Papadopoulos, T. Ruf, F. Henry-Couannier, P.R. Kettle, L. Tauscher, Marcin Wladyslaw Wolter, Lukas A. Schaller, J. Derre, Panagiotis Kokkas, G. Marel, F. Blanc, A. Go, E. Cawley, Mats Danielsson, O. Wigger, T. Schietinger, David Francis, Sotirios Vlachos, Elie Aslanides, J. S. Miller, A. Angelopoulos, B. Pagels, Marc Dejardin, A. Benelli, C.W.E. van Eijk, A. Haselden, A. Ealet, Igor Mandić, R.W. Hollander, Michael C. Carroll, R. Kreuger, D. Zimmerman, P. Carlson, Danilo Zavrtanik, V. Bertin, M. Schafer, G. Backenstoss, Andrej Filipcic, G. Polivka, C. Thibault, B. L. Roberts, and Francois Touchard

Subjects
Physics, Nuclear physics, Particle physics, Positron, Pion, media_common.quotation_subject, Charge (physics), Electron, Strangeness, Neutrino, Asymmetry, Lepton, media_common
Abstract

Using its unique capability of strangeness tagging at K0 production in pp→K∓π±K0(K0) and at decay with the lepton charge in semileptonic decays CPLEAR measured the semileptonic decay-rate asymmetry R(K0→e+π−ν)−R(K0→e−π+ν)R(K0→e+π−ν)+R(K0→e−π+ν). The asymmetry, fitted over the eigentime interval 1–20 τS, yielded a non-zero result of (6.6±1.3stat±1.1syst)×10−3. A thorough phenomenological anaylsis identifies T violation in K0 mixing and/or CPT violation in semileptonic decays as possible interpretations. A confrontation with world data on neutral kaon decays, however, excludes the latter with sufficient precision to establish the result as the first direct observation of time reversal non-invariance.

Published
2000
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2. Upper limit for the branching ratio of K[sub S]→e[sup +]e[sup −] decay

Author

J. Pinto da Cunha, C. Eleftheriadis, Mats Danielsson, W. Fetscher, F. Montanet, E. Machado, E. Hubert, A.J.P.L. Policarpo, A. Apostolakis, A. Benelli, C.W.E. van Eijk, P.R. Kettle, L. Tauscher, F. Henry-Couannier, D. Zimmerman, A. Muller, O. Behnke, J. S. Miller, P. Weber, P. Carlson, M. Mikuž, M.B. Chertok, R. Le Gac, C. Thibault, F. Leimgruber, João Carvalho, A. Schopper, B. L. Roberts, P. Pavlopoulos, Marc Dejardin, Elie Aslanides, P.J. Hayman, Andrej Filipcic, E. van Beveren, T. Nakada, F. Blanc, A. Go, Sotirios Vlachos, Marcin Wladyslaw Wolter, J. Derre, O. Wigger, B. Pagels, A. Soares, T. Ruf, C. Touramanis, A. Angelopoulos, J. R. Fry, A. Haselden, Michael C. Carroll, Francois Touchard, R. Gamet, Frixos A Triantis, Kerstin Jon-And, C. Yeche, A. Ealet, R. Kreuger, G. Chardin, Nikolaos Manthos, P. Bargassa, A. Liolios, R.W. Hollander, H.-J. Gerber, D. Garreta, G. Backenstoss, P. Bloch, Lukas A. Schaller, Ioannis Evangelou, David Francis, L. Sakeliou, Igor Mandić, G. Marel, E. Cawley, A. Cody, L. Faravel, Panagiotis Kokkas, T. Schietinger, R. Ferreira-Marques, Ioannis Papadopoulos, M. Fidecaro, Stef. Charalambous, G. Polivka, P. Sanders, Danilo Zavrtanik, V. Bertin, M. Schafer, E. Gabathuler, and R. Rickenbach

Subjects
Nuclear physics, Physics, Particle physics, Positron, Branching fraction, Detector, Electron, Limit (mathematics), Particle identification, Calorimeter, Event reconstruction
Abstract

A measurement of the branching ratio for KS→e+e− decay was performed with the CPLEAR detector at LEAR. Full event reconstruction together with calorimeter e/π separation allowed for powerful background rejection and high signal acceptance. The analysis on the complete set of data yields the result: BR(KS→e+e−)

Published
1998
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3. CP, T, and CPT tests in neutral Kaon decays using tagged K0, K0at LEAR

Author

L. Faravel, C.W.E. van Eijk, E. Hubert, K. Sarigiannis, T. Alhalel, O. Behnke, H.-J. Gerber, Danilo Zavrtanik, G. Marel, Sp. Dedoussis, Marcin Wladyslaw Wolter, J. Derre, F. Montanet, Christopher Bee, G. Chardin, Jean-Louis Faure, D. Zimmerman, T. Lawry, E. Cawley, V. Bertin, D.A. Troster, F. Leimgruber, R. Le Gac, P. Carlson, A. Schopper, E. van Beveren, F. Blanc, C. Kochowski, M. Mikuž, L. Sacks, D. Garreta, G. Backenstoss, M. Schafer, J. S. Miller, Ioannis Evangelou, B. Pagels, P.J. Hayman, Panagiotis Kokkas, P. Gumplinger, L. Sakeliou, E. Machado, Michael C. Carroll, Marc Dejardin, Stef. Charalambous, B. Eckart, J. R. Fry, H. Postma, Elie Aslanides, F. Pelucchi, J. Duclos, P.R. Kettle, L. Tauscher, G. Polivka, Patrick Fassnacht, Ch. Bula, C. Witzig, Ph. Schune, A. Onofre, Sotirios Vlachos, C. Touramanis, T. Ruf, R. Kreuger, Andrej Filipcic, P. Sanders, M. Fidecaro, A. Angelopoulos, W. Fetscher, Frixos A Triantis, T. Nakada, A. Go, K. Jansson, J. Pinto da Cunha, Kerstin Jon-And, Nikolaos Manthos, C. Thibault, A. Soares, B. L. Roberts, C. Eleftheriadis, C. Felder, A. Liolios, R. Gamet, H.U. Johner, Claudio Santoni, Claude Guyot, C. Yeche, T. Geralis, F. Henry-Couannier, Lukas A. Schaller, E. Rozaki, O. Wigger, Francois Touchard, J. Bennet, A.J.P.L. Policarpo, R. Ferreira-Marques, P. Weber, João Carvalho, David Francis, Igor Mandić, A. Cody, M. Dodgson, E. Gabathuler, R. Rickenbach, P. Maley, P. Pavlopoulos, A. Apostolakis, P. Bloch, A. Haselden, A. Ealet, R.W. Hollander, M. Chardalas, M.B. Chertok, Mats Danielsson, and R. Adler

Subjects
Nuclear physics, Physics, Particle physics, Large Hadron Collider, media_common.quotation_subject, Strangeness, Asymmetry, media_common
Abstract

The CPLEAR experiment at CERN measures particle‐antiparticle asymmetries of strangeness‐tagged K0, K0 decays to two‐pion, three‐pion, and semileptonic final states. The technique of CPLEAR is an alternative approach to previous CP‐violation studies. It provides complementary information with different systematics and gives access to novel measurements. The precision of the CP‐violation parameters η+− for π+π−, η+−0 for π+π−π0 and of the T‐violation parameter eT for π±e∓ν will be discussed for the data taken between 1990–1992.

Published
1995
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