Study of the CP asymmetry of B0 -> J/psi K0S decays in ALEPH

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RESEARCH PRODUCT

Study of the CP asymmetry of B0 -> J/psi K0S decays in ALEPH

R. Barate D. Decamp P. Ghez C. Goy J.-p. Lees E. Merle M.-n. Minard B. Pietrzyk S. Bravo M.p. Casado M. Chmeissani J.m. Crespo E. Fernandez M. Fernandez-bosman Ll. Garrido E. Graugés M. Martinez G. Merino R. Miquel Ll.m. Mir A. Pacheco H. Ruiz A. Colaleo D. Creanza M. De Palma G. Iaselli G. Maggi M. Maggi S. Nuzzo A. Ranieri G. Raso F. Ruggieri G. Selvaggi L. Silvestris P. Tempesta A. Tricomi G. Zito X. Huang J. Lin Q. Ouyang T. Wang Y. Xie R. Xu S. Xue J. Zhang L. Zhang W. Zhao D. Abbaneo G. Boix O. Buchmüller M. Cattaneo F. Cerutti G. Dissertori H. Drevermann R.w. Forty M. Frank T.c. Greening J.b. Hansen J. Harvey P. Janot B. Jost I. Lehraus P. Mato A. Minten A. Moutoussi F. Ranjard L. Rolandi D. Schlatter M. Schmitt O. Schneider P. Spagnolo W. Tejessy F. Teubert E. Tournefier A.e. Wright Z. Ajaltouni F. Badaud G. Chazelle O. Deschamps A. Falvard P. Gay C. Guicheney P. Henrard J. Jousset B. Michel S. Monteil J.-c. Montret D. Pallin P. Perret F. Podlyski J.d. Hansen J.r. Hansen P.h. Hansen B.s. Nilsson B.a. Petersen A. Wäänänen G. Daskalakis A. Kyriakis C. Markou E. Simopoulou A. Vayaki A. Blondel G. Bonneaud J.-c. Brient A. Rougé M. Rumpf M. Swynghedauw M. Verderi H. Videau E. Focardi G. Parrini K. Zachariadou A. Antonelli M. Antonelli G. Bencivenni G. Bologna F. Bossi P. Campana G. Capon V. Chiarella P. Laurelli G. Mannocchi F. Murtas G.p. Murtas L. Passalacqua M. Pepe-altarelli A.w. Halley J.g. Lynch P. Negus V. O'shea C. Raine P. Teixeira-dias A.s. Thompson R. Cavanaugh S. Dhamotharan C. Geweniger P. Hanke G. Hansper V. Hepp E.e. Kluge A. Putzer J. Sommer K. Tittel S. Werner M. Wunsch R. Beuselinck D.m. Binnie W. Cameron P.j. Dornan M. Girone N. Marinelli J.k. Sedgbeer J.c. Thompson E. Thomson V.m. Ghete P. Girtler E. Kneringer D. Kuhn G. Rudolph C.k. Bowdery P.g. Buck A.j. Finch F. Foster G. Hughes R.w.l. Jones N.a. Robertson I. Giehl K. Jakobs K. Kleinknecht G. Quast B. Renk E. Rohne H.-g. Sander H. Wachsmuth C. Zeitnitz A. Bonissent J. Carr P. Coyle O. Leroy P. Payre D. Rousseau M. Talby M. Aleppo F. Ragusa H. Dietl G. Ganis A. Heister K. Hüttmann G. Lütjens C. Mannert W. Männer H.-g. Moser S. Schael R. Settles H. Stenzel W. Wiedenmann G. Wolf P. Azzurri J. Boucrot O. Callot S. Chen A. Cordier M. Davier L. Duflot J.-f. Grivaz Ph. Heusse A. Jacholkowska F. Le Diberder J. Lefrançois A.-m. Lutz M.-h. Schune J.-j. Veillet I. Videau C. Yuan D. Zerwas G. Bagliesi T. Boccali G. Calderini V. Ciulli L. Foà A. Giassi F. Ligabue A. Messineo F. Palla G. Sanguinetti A. Sciabà G. Sguazzoni R. Tenchini A. Venturi P.g. Verdini G.a. Blair G. Cowan M.g. Green T. Medcalf J.a. Strong J.h. Von Wimmersperg-toeller R.w. Clifft T.r. Edgecock P.r. Norton I.r. Tomalin B. Bloch-devaux P. Colas S. Emery W. Kozanecki E. Lançon M.-c. Lemaire E. Locci P. Perez J. Rander J.-f. Renardy A. Roussarie J.-p. Schuller J. Schwindling A. Trabelsi B. Vallage S.n. Black J.h. Dann R.p. Johnson H.y. Kim N. Konstantinidis A.m. Litke M.a. Mcneil G. Taylor C.n. Booth S. Cartwright F. Combley M. Lehto L.f. Thompson K. Affholderbach A. Böhrer S. Brandt C. Grupen A. Misiejuk G. Prange U. Sieler G. Giannini B. Gobbo J. Rothberg S. Wasserbaech S.r. Armstrong K. Cranmer P. Elmer D.p.s. Ferguson Y. Gao S. González O.j. Hayes H. Hu S. Jin J. Kile P.a. Mcnamara J. Nielsen W. Orejudos Y.b. Pan Y. Saadi I.j. Scott J. Walsh Sau Lan Wu X. Wu G. Zobernig

subject

Physics Nuclear and High Energy Physics Aleph Particle physics 010308 nuclear & particles physics Electron–positron annihilation media_common.quotation_subject Hadron 01 natural sciences Asymmetry Standard Model High Energy Physics - Experiment Nuclear physics 0103 physical sciences CP violation 010306 general physics media_common

description

The decay B0 -> J/psi K0_S is reconstructed with J/psi -> e+ e- or mu+ mu- and K0_S -> pi+ pi-. From the full ALEPH dataset at LEP1 of about 4 million hadronic Z decays, 23 candidates are selected with an estimated purity of 71%. They are used to measure the CP asymmetry of this decay, given by sin 2beta in the Standard Model, with the result sin 2beta = 0.84 +0.82-1.04 +-0.16. This is combined with existing measurements from other experiments, and increases the confidence level that CP violation has been observed in this channel to 98%.

year	journal	country	edition	language
2000-09-27

10.1016/s0370-2693(00)01091-1 http://arxiv.org/abs/hep-ex/0009058