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First direct observation of time-reversal violation

 

作者: A. Angelopoulos,   A. Apostolakis,   E. Aslanides,   G. Backenstoss,   P. Bargassa,   O. Behnke,   A. Benelli,   V. Bertin,   F. Blanc,   P. Bloch,   P. Carlson,   M. Carroll,   E. Cawley,   M. B. Chertok,   M. Danielsson,   M. Dejardin,   J. Derre,   A. Ealet,   C. Eleftheriadis,   W. Fetscher,   M. Fidecaro,   A. Filipcˇicˇ,   D. Francis,   J. Fry,   E. Gabathuler,   R. Gamet,   H.-J. Gerber,   A. Go,   A. Haselden,   P. J. Hayman,   F. Henry-Couannier,   R. W. Hollander,   K. Jon-And,   P.-R. Kettle,   P. Kokkas,   R. Kreuger,   R. Le Gac,   F. Leimgruber,   I. Mandic´,   N. Manthos,   G. Marel,   M. Mikuzˇ,   J. Miller,   F. Montanet,   A. Muller,   T. Nakada,   B. Pagels,   I. Papadopoulos,   P. Pavlopoulos,   G. Polivka,   R. Rickenbach,   B. L. Roberts,   T. Ruf,   M. Scha¨fer,   L. A. Schaller,   T. Schietinger,   A. Schopper,   L. Tauscher,   C. Thibault,   F. Touchard,   C. Touramanis,   C. W. E. Van Eijk,   S. Vlachos,   P. Weber,   O. Wigger,   M. Wolter,   D. Zavrtanik,   D. Zimmerman,  

 

期刊: AIP Conference Proceedings  （AIP Available online 1900）
卷期: Volume 549, issue 1  

页码: 957-960

 

ISSN:0094-243X

 

年代: 1900

 

DOI:10.1063/1.1345406

 

出版商: AIP

 

数据来源: AIP

 

摘要:

Using its unique capability of strangeness tagging atK0production inpp¯→K∓&pgr;±K0(K¯0)and at decay with the lepton charge in semileptonic decays CPLEAR measured the semileptonic decay-rate asymmetryR(K¯0→e+&pgr;−&ngr;)−R(K0→e−&pgr;+&ngr;¯)R(K¯0→e+&pgr;−&ngr;)+R(K0→e−&pgr;+&ngr;¯).The asymmetry, fitted over the eigentime interval 1–20&tgr;S,yielded a non-zero result of(6.6±1.3stat±1.1syst)×10−3.A thorough phenomenological anaylsis identifies T violation inK0mixing 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. ©2000 American Institute of Physics.

 

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