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Title: First direct observation of time-reversal non-invariance in the neutral-kaon system
Authors: Angelopoulos, A. 
Apostolakis, A. 
Aslanides, E. 
Backenstoss, G. 
Bargassa, P. 
Behnke, O. 
Benelli, A. 
Bertin, V. 
Blanc, F. 
Bloch, P. 
Carlson, P. 
Carroll, M. 
Cawley, E. 
Charalambous, S. 
Chertok, M. B. 
Danielsson, M. 
Dejardin, M. 
Derre, J. 
Ealet, A. 
Eleftheriadis, C. 
Faravel, L. 
Fetscher, W. 
Fidecaro, M. 
Filipcic, A. 
Francis, D. 
Fry, J. 
Gabathuler, E. 
Gamet, R. 
Gerber, H. -J. 
Go, A. 
Haselden, A. 
Hayman, P. J. 
Henry-Couannier, F. 
Hollander, R. W. 
Jon-And, K. 
Kettle, P. -R. 
Kokkas, P. 
Kreuger, R. 
Le Gac, R. 
Leimgruber, F. 
Mandic, I. 
Manthos, N. 
Marel, G. 
Mikuz, M. 
Miller, J. 
Montanet, F. 
Muller, A. 
Nakada, T. 
Pagels, B. 
Papadopoulos, I. 
Pavlopoulos, P. 
Policarpo, A. 
Polivka, G. 
Rickenbach, R. 
Roberts, B. L. 
Ruf, T. 
Santoni, C. 
Schäfer, M. 
Schaller, L. A. 
Schietinger, T. 
Schopper, A. 
Tauscher, L. 
Thibault, C. 
Touchard, F. 
Touramanis, C. 
Van Eijk, C. W. E. 
Vlachos, S. 
Weber, P. 
Wigger, O. 
Wolter, M. 
Zavrtanik, D. 
Zimmerman, D. 
Issue Date: 1998
Citation: Physics Letters B. 444:1-2 (1998) 43-51
Abstract: We report on the first observation of time-reversal symmetry violation through a comparison of the probabilities of transforming into K0 and K0 into 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 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 asymmetrywas measured over the interval 1 [tau]S<[tau]<20 [tau]S, thus leading to evidence for time-reversal non-invariance.
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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