First direct observation of time-reversal non-invariance in the neutral-kaon system (Journal article)

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./ Schafer, M./ Schaller, L. A./ Schietinger, T./ Schopper, A./ Tauscher, L./ Thibault, C./ Touchard, F./ Touramanis, C./ Van Eijk, C. W. E./ Vlachos, S./ Weber, P./ Wigger, O./ Wolter, M./ Zavrtanik, D./ Zimmerman, D./ Cplear Collaboration

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+<(nu)over bar>t=tau)/R((K) over bart=00 --> e+pi-nut=tau) + R(Kt=00 --> e-pi+<(nu)over bar>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.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών
ISSN: 0370-2693
Link: <Go to ISI>://WOS:000077887700008
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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