Search for CP violation in B0-B0 mixing using partial reconstruction of B0→D*- Xℓ+ νℓ and a kaon tag

J P Lees; V Poireau; V Tisserand; E Grauges; A Palano; G Eigen; B Stugu; D N Brown; L T Kerth; Yu G Kolomensky; M J Lee; G Lynch; H Koch; T Schroeder; C Hearty; T S Mattison; J A McKenna; R Y So; A Khan; V E Blinov; A R Buzykaev; V P Druzhinin; V B Golubev; E A Kravchenko; A P Onuchin; S I Serednyakov; Yu I Skovpen; E P Solodov; K Yu Todyshev; A N Yushkov; D Kirkby; A J Lankford; M Mandelkern; B Dey; J W Gary; O Long; G M Vitug; C Campagnari; M Franco Sevilla; T M Hong; D Kovalskyi; J D Richman; C A West; A M Eisner; W S Lockman; A J Martinez; B A Schumm; A Seiden; D S Chao; C H Cheng; B Echenard; K T Flood; D G Hitlin; P Ongmongkolkul; F C Porter; R Andreassen; Z Huard; B T Meadows; M D Sokoloff; L Sun; P C Bloom; W T Ford; A Gaz; U Nauenberg; J G Smith; S R Wagner; R Ayad; W H Toki; B Spaan; K R Schubert; R Schwierz; D Bernard; M Verderi; S Playfer; D Bettoni; C Bozzi; R Calabrese; G Cibinetto; E Fioravanti; I Garzia; E Luppi; L Piemontese; V Santoro; R Baldini-Ferroli; A Calcaterra; R de Sangro; G Finocchiaro; S Martellotti; P Patteri; I M Peruzzi; M Piccolo; M Rama; A Zallo; R Contri; E Guido; M Lo Vetere; M R Monge; S Passaggio; C Patrignani; E Robutti; B Bhuyan; V Prasad; M Morii; A Adametz; U Uwer; H M Lacker; P D Dauncey; U Mallik; C Chen; J Cochran; W T Meyer; S Prell; A E Rubin; A V Gritsan; N Arnaud; M Davier; D Derkach; G Grosdidier; F Le Diberder; A M Lutz; B Malaescu; P Roudeau; A Stocchi; G Wormser; D J Lange; D M Wright; J P Coleman; J R Fry; E Gabathuler; D E Hutchcroft; D J Payne; C Touramanis; A J Bevan; F Di Lodovico; R Sacco; G Cowan; J Bougher; D N Brown; C L Davis; A G Denig; M Fritsch; W Gradl; K Griessinger; A Hafner; E Prencipe; R J Barlow; G D Lafferty; E Behn; R Cenci; B Hamilton; A Jawahery; D A Roberts; R Cowan; D Dujmic; G Sciolla; R Cheaib; P M Patel; S H Robertson; P Biassoni; N Neri; F Palombo; L Cremaldi; R Godang; P Sonnek; D J Summers; X Nguyen; M Simard; P Taras; G De Nardo; D Monorchio; G Onorato; C Sciacca; M Martinelli; G Raven; C P Jessop; J M LoSecco; K Honscheid; R Kass; J Brau; R Frey; N B Sinev; D Strom; E Torrence; E Feltresi; M Margoni; M Morandin; M Posocco; M Rotondo; G Simi; F Simonetto; R Stroili; S Akar; E Ben-Haim; M Bomben; G R Bonneaud; H Briand; G Calderini; J Chauveau; Ph Leruste; G Marchiori; J Ocariz; S Sitt; M Biasini; E Manoni; S Pacetti; A Rossi; C Angelini; G Batignani; S Bettarini; M Carpinelli; G Casarosa; A Cervelli; F Forti; M A Giorgi; A Lusiani; B Oberhof; E Paoloni; A Perez; G Rizzo; J J Walsh; D Lopes Pegna; J Olsen; A J S Smith; R Faccini; F Ferrarotto; F Ferroni; M Gaspero; L Li Gioi; G Piredda; C Bünger; O Grünberg; T Hartmann; T Leddig; C Voß; R Waldi; T Adye; E O Olaiya; F F Wilson; S Emery; G Hamel de Monchenault; G Vasseur; Ch Yèche; F Anulli; D Aston; D J Bard; J F Benitez; C Cartaro; M R Convery; J Dorfan; G P Dubois-Felsmann; W Dunwoodie; M Ebert; R C Field; B G Fulsom; A M Gabareen; M T Graham; C Hast; W R Innes; P Kim; M L Kocian; D W G S Leith; P Lewis; D Lindemann; B Lindquist; S Luitz; V Luth; H L Lynch; D B MacFarlane; D R Muller; H Neal; S Nelson; M Perl; T Pulliam; B N Ratcliff; A Roodman; A A Salnikov; R H Schindler; A Snyder; D Su; M K Sullivan; J Va'vra; A P Wagner; W F Wang; W J Wisniewski; M Wittgen; D H Wright; H W Wulsin; V Ziegler; W Park; M V Purohit; R M White; J R Wilson; A Randle-Conde; S J Sekula; M Bellis; P R Burchat; T S Miyashita; E M T Puccio; M S Alam; J A Ernst; R Gorodeisky; N Guttman; D R Peimer; A Soffer; S M Spanier; J L Ritchie; A M Ruland; R F Schwitters; B C Wray; J M Izen; X C Lou; F Bianchi; F De Mori; A Filippi; D Gamba; S Zambito; L Lanceri; L Vitale; F Martinez-Vidal; A Oyanguren; P Villanueva-Perez; H Ahmed; J Albert; Sw Banerjee; F U Bernlochner; H H F Choi; G J King; R Kowalewski; M J Lewczuk; T Lueck; I M Nugent; J M Roney; R J Sobie; N Tasneem; T J Gershon; P F Harrison; T E Latham; H R Band; S Dasu; Y Pan; R Prepost; S L Wu; BABAR Collaboration

doi:10.1103/PhysRevLett.111.101802

Search for CP violation in B0-B0 mixing using partial reconstruction of B0→D*- Xℓ+ νℓ and a kaon tag

Phys Rev Lett. 2013 Sep 6;111(10):101802. doi: 10.1103/PhysRevLett.111.101802. Epub 2013 Sep 3.

Authors

J P Lees¹, V Poireau¹, V Tisserand¹, E Grauges², A Palano³, G Eigen⁴, B Stugu⁴, D N Brown⁵, L T Kerth⁵, Yu G Kolomensky⁵, M J Lee⁵, G Lynch⁵, H Koch⁶, T Schroeder⁶, C Hearty⁷, T S Mattison⁷, J A McKenna⁷, R Y So⁷, A Khan⁸, V E Blinov⁹, A R Buzykaev¹⁰, V P Druzhinin¹¹, V B Golubev¹¹, E A Kravchenko¹¹, A P Onuchin⁹, S I Serednyakov¹¹, Yu I Skovpen¹¹, E P Solodov¹¹, K Yu Todyshev¹¹, A N Yushkov¹⁰, D Kirkby¹², A J Lankford¹², M Mandelkern¹², B Dey¹³, J W Gary¹³, O Long¹³, G M Vitug¹³, C Campagnari¹⁴, M Franco Sevilla¹⁴, T M Hong¹⁴, D Kovalskyi¹⁴, J D Richman¹⁴, C A West¹⁴, A M Eisner¹⁵, W S Lockman¹⁵, A J Martinez¹⁵, B A Schumm¹⁵, A Seiden¹⁵, D S Chao¹⁶, C H Cheng¹⁶, B Echenard¹⁶, K T Flood¹⁶, D G Hitlin¹⁶, P Ongmongkolkul¹⁶, F C Porter¹⁶, R Andreassen¹⁷, Z Huard¹⁷, B T Meadows¹⁷, M D Sokoloff¹⁷, L Sun¹⁷, P C Bloom¹⁸, W T Ford¹⁸, A Gaz¹⁸, U Nauenberg¹⁸, J G Smith¹⁸, S R Wagner¹⁸, R Ayad¹⁹, W H Toki¹⁹, B Spaan²⁰, K R Schubert²¹, R Schwierz²¹, D Bernard²², M Verderi²², S Playfer²³, D Bettoni²⁴, C Bozzi²⁴, R Calabrese²⁵, G Cibinetto²⁵, E Fioravanti²⁵, I Garzia²⁵, E Luppi²⁵, L Piemontese²⁴, V Santoro²⁴, R Baldini-Ferroli²⁶, A Calcaterra²⁶, R de Sangro²⁶, G Finocchiaro²⁶, S Martellotti²⁶, P Patteri²⁶, I M Peruzzi²⁶, M Piccolo²⁶, M Rama²⁶, A Zallo²⁶, R Contri²⁷, E Guido²⁷, M Lo Vetere²⁷, M R Monge²⁷, S Passaggio²⁸, C Patrignani²⁷, E Robutti²⁸, B Bhuyan²⁹, V Prasad²⁹, M Morii³⁰, A Adametz³¹, U Uwer³¹, H M Lacker³², P D Dauncey³³, U Mallik³⁴, C Chen³⁵, J Cochran³⁵, W T Meyer³⁵, S Prell³⁵, A E Rubin³⁵, A V Gritsan³⁶, N Arnaud³⁷, M Davier³⁷, D Derkach³⁷, G Grosdidier³⁷, F Le Diberder³⁷, A M Lutz³⁷, B Malaescu³⁷, P Roudeau³⁷, A Stocchi³⁷, G Wormser³⁷, D J Lange³⁸, D M Wright³⁸, J P Coleman³⁹, J R Fry³⁹, E Gabathuler³⁹, D E Hutchcroft³⁹, D J Payne³⁹, C Touramanis³⁹, A J Bevan⁴⁰, F Di Lodovico⁴⁰, R Sacco⁴⁰, G Cowan⁴¹, J Bougher⁴², D N Brown⁴², C L Davis⁴², A G Denig⁴³, M Fritsch⁴³, W Gradl⁴³, K Griessinger⁴³, A Hafner⁴³, E Prencipe⁴³, R J Barlow⁴⁴, G D Lafferty⁴⁴, E Behn⁴⁵, R Cenci⁴⁵, B Hamilton⁴⁵, A Jawahery⁴⁵, D A Roberts⁴⁵, R Cowan⁴⁶, D Dujmic⁴⁶, G Sciolla⁴⁶, R Cheaib⁴⁷, P M Patel⁴⁷, S H Robertson⁴⁷, P Biassoni⁴⁸, N Neri⁴⁹, F Palombo⁴⁸, L Cremaldi⁵⁰, R Godang⁵⁰, P Sonnek⁵⁰, D J Summers⁵⁰, X Nguyen⁵¹, M Simard⁵¹, P Taras⁵¹, G De Nardo⁵², D Monorchio⁵², G Onorato⁵², C Sciacca⁵², M Martinelli⁵³, G Raven⁵³, C P Jessop⁵⁴, J M LoSecco⁵⁴, K Honscheid⁵⁵, R Kass⁵⁵, J Brau⁵⁶, R Frey⁵⁶, N B Sinev⁵⁶, D Strom⁵⁶, E Torrence⁵⁶, E Feltresi⁵⁷, M Margoni⁵⁷, M Morandin⁵⁸, M Posocco⁵⁸, M Rotondo⁵⁸, G Simi⁵⁷, F Simonetto⁵⁷, R Stroili⁵⁷, S Akar⁵⁹, E Ben-Haim⁵⁹, M Bomben⁵⁹, G R Bonneaud⁵⁹, H Briand⁵⁹, G Calderini⁵⁹, J Chauveau⁵⁹, Ph Leruste⁵⁹, G Marchiori⁵⁹, J Ocariz⁵⁹, S Sitt⁵⁹, M Biasini⁶⁰, E Manoni⁶¹, S Pacetti⁶⁰, A Rossi⁶¹, C Angelini⁶⁰, G Batignani⁶², S Bettarini⁶², M Carpinelli⁶², G Casarosa⁶², A Cervelli⁶², F Forti⁶², M A Giorgi⁶², A Lusiani⁶³, B Oberhof⁶², E Paoloni⁶², A Perez⁶⁴, G Rizzo⁶², J J Walsh⁶⁴, D Lopes Pegna⁶⁵, J Olsen⁶⁵, A J S Smith⁶⁵, R Faccini⁶⁶, F Ferrarotto⁶⁷, F Ferroni⁶⁶, M Gaspero⁶⁶, L Li Gioi⁶⁷, G Piredda⁶⁷, C Bünger⁶⁸, O Grünberg⁶⁸, T Hartmann⁶⁸, T Leddig⁶⁸, C Voß⁶⁸, R Waldi⁶⁸, T Adye⁶⁹, E O Olaiya⁶⁹, F F Wilson⁶⁹, S Emery⁷⁰, G Hamel de Monchenault⁷⁰, G Vasseur⁷⁰, Ch Yèche⁷⁰, F Anulli⁷¹, D Aston⁷¹, D J Bard⁷¹, J F Benitez⁷¹, C Cartaro⁷¹, M R Convery⁷¹, J Dorfan⁷¹, G P Dubois-Felsmann⁷¹, W Dunwoodie⁷¹, M Ebert⁷¹, R C Field⁷¹, B G Fulsom⁷¹, A M Gabareen⁷¹, M T Graham⁷¹, C Hast⁷¹, W R Innes⁷¹, P Kim⁷¹, M L Kocian⁷¹, D W G S Leith⁷¹, P Lewis⁷¹, D Lindemann⁷¹, B Lindquist⁷¹, S Luitz⁷¹, V Luth⁷¹, H L Lynch⁷¹, D B MacFarlane⁷¹, D R Muller⁷¹, H Neal⁷¹, S Nelson⁷¹, M Perl⁷¹, T Pulliam⁷¹, B N Ratcliff⁷¹, A Roodman⁷¹, A A Salnikov⁷¹, R H Schindler⁷¹, A Snyder⁷¹, D Su⁷¹, M K Sullivan⁷¹, J Va'vra⁷¹, A P Wagner⁷¹, W F Wang⁷¹, W J Wisniewski⁷¹, M Wittgen⁷¹, D H Wright⁷¹, H W Wulsin⁷¹, V Ziegler⁷¹, W Park⁷², M V Purohit⁷², R M White⁷², J R Wilson⁷², A Randle-Conde⁷³, S J Sekula⁷³, M Bellis⁷⁴, P R Burchat⁷⁴, T S Miyashita⁷⁴, E M T Puccio⁷⁴, M S Alam⁷⁵, J A Ernst⁷⁵, R Gorodeisky⁷⁶, N Guttman⁷⁶, D R Peimer⁷⁶, A Soffer⁷⁶, S M Spanier⁷⁷, J L Ritchie⁷⁸, A M Ruland⁷⁸, R F Schwitters⁷⁸, B C Wray⁷⁸, J M Izen⁷⁹, X C Lou⁷⁹, F Bianchi⁸⁰, F De Mori⁸¹, A Filippi⁸¹, D Gamba⁸⁰, S Zambito⁸⁰, L Lanceri⁸², L Vitale⁸², F Martinez-Vidal⁸³, A Oyanguren⁸³, P Villanueva-Perez⁸³, H Ahmed⁸⁴, J Albert⁸⁴, Sw Banerjee⁸⁴, F U Bernlochner⁸⁴, H H F Choi⁸⁴, G J King⁸⁴, R Kowalewski⁸⁴, M J Lewczuk⁸⁴, T Lueck⁸⁴, I M Nugent⁸⁴, J M Roney⁸⁴, R J Sobie⁸⁴, N Tasneem⁸⁴, T J Gershon⁸⁵, P F Harrison⁸⁵, T E Latham⁸⁵, H R Band⁸⁶, S Dasu⁸⁶, Y Pan⁸⁶, R Prepost⁸⁶, S L Wu⁸⁶; BABAR Collaboration

Affiliations

¹ Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France.
² Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona, Spain.
³ INFN Sezione di Bari, I-70126 Bari, Italy and Dipartimento di Fisica, Università di Bari, I-70126 Bari, Italy.
⁴ University of Bergen, Institute of Physics, N-5007 Bergen, Norway.
⁵ Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USA.
⁶ Institut für Experimentalphysik 1, Ruhr Universität Bochum, D-44780 Bochum, Germany.
⁷ University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1.
⁸ Brunel University, Uxbridge, Middlesex UB8 3PH, United Kingdom.
⁹ Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russia and Novosibirsk State Technical University, Novosibirsk 630092, Russia.
¹⁰ Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russia.
¹¹ Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russia and Novosibirsk State University, Novosibirsk 630090, Russia.
¹² University of California at Irvine, Irvine, California 92697, USA.
¹³ University of California at Riverside, Riverside, California 92521, USA.
¹⁴ University of California at Santa Barbara, Santa Barbara, California 93106, USA.
¹⁵ Institute for Particle Physics, Santa Cruz, University of California at Santa Cruz, California 95064, USA.
¹⁶ California Institute of Technology, Pasadena, California 91125, USA.
¹⁷ University of Cincinnati, Cincinnati, Ohio 45221, USA.
¹⁸ University of Colorado, Boulder, Colorado 80309, USA.
¹⁹ Colorado State University, Fort Collins, Colorado 80523, USA.
²⁰ Technische Universität Dortmund, Fakultät Physik, D-44221 Dortmund, Germany.
²¹ Technische Universität Dresden, Institut für Kern- und Teilchenphysik, D-01062 Dresden, Germany.
²² Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, F-91128 Palaiseau, France.
²³ University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
²⁴ INFN Sezione di Ferrara, I-44122 Ferrara, Italy.
²⁵ INFN Sezione di Ferrara, I-44122 Ferrara, Italy and Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, I-44122 Ferrara, Italy.
²⁶ INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy.
²⁷ INFN Sezione di Genova, I-16146 Genova, Italy and Dipartimento di Fisica, Università di Genova, I-16146 Genova, Italy.
²⁸ INFN Sezione di Genova, I-16146 Genova, Italy.
²⁹ Indian Institute of Technology Guwahati, Guwahati, Assam 781 039, India.
³⁰ Harvard University, Cambridge, Massachusetts 02138, USA.
³¹ Physikalisches Institut, Universität Heidelberg, D-69120 Heidelberg, Germany.
³² Institut für Physik, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany.
³³ Imperial College London, London SW7 2AZ, United Kingdom.
³⁴ University of Iowa, Iowa City, Iowa 52242, USA.
³⁵ Iowa State University, Ames, Iowa 50011-3160, USA.
³⁶ Johns Hopkins University, Baltimore, Maryland 21218, USA.
³⁷ Laboratoire de l'Accélérateur Linéaire, IN2P3/CNRS et Université Paris-Sud 11, Centre Scientifique d'Orsay, F-91898 Orsay Cedex, France.
³⁸ Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
³⁹ University of Liverpool, Liverpool L69 7ZE, United Kingdom.
⁴⁰ Queen Mary, University of London, London, E1 4NS, United Kingdom.
⁴¹ University of London, Royal Holloway and Bedford New College, Egham, Surrey TW20 0EX, United Kingdom.
⁴² University of Louisville, Louisville, Kentucky 40292, USA.
⁴³ Johannes Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz, Germany.
⁴⁴ University of Manchester, Manchester M13 9PL, United Kingdom.
⁴⁵ University of Maryland, College Park, Maryland 20742, USA.
⁴⁶ Massachusetts Institute of Technology, Laboratory for Nuclear Science, Cambridge, Massachusetts 02139, USA.
⁴⁷ McGill University, Montréal, Québec, Canada H3A 2T8.
⁴⁸ INFN Sezione di Milano, I-20133 Milano, Italy and Dipartimento di Fisica, Università di Milano, I-20133 Milano, Italy.
⁴⁹ INFN Sezione di Milano, I-20133 Milano, Italy.
⁵⁰ University of Mississippi, University, Mississippi 38677, USA.
⁵¹ Université de Montréal, Physique des Particules, Montréal, Québec, Canada H3C 3J7.
⁵² INFN Sezione di Napoli, I-80126 Napoli, Italy and Dipartimento di Scienze Fisiche, Università di Napoli Federico II, I-80126 Napoli, Italy.
⁵³ NIKHEF, National Institute for Nuclear Physics and High Energy Physics, NL-1009 DB Amsterdam, The Netherlands.
⁵⁴ University of Notre Dame, Notre Dame, Indiana 46556, USA.
⁵⁵ Ohio State University, Columbus, Ohio 43210, USA.
⁵⁶ University of Oregon, Eugene, Oregon 97403, USA.
⁵⁷ INFN Sezione di Padova, I-35131 Padova, Italy and Dipartimento di Fisica, Università di Padova, I-35131 Padova, Italy.
⁵⁸ INFN Sezione di Padova, I-35131 Padova, Italy.
⁵⁹ Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France.
⁶⁰ INFN Sezione di Perugia, I-06123 Perugia, Italy and Dipartimento di Fisica, Università di Perugia, I-06123 Perugia, Italy.
⁶¹ INFN Sezione di Perugia, I-06123 Perugia, Italy.
⁶² INFN Sezione di Pisa, I-56127 Pisa, Italy and Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy.
⁶³ INFN Sezione di Pisa, I-56127 Pisa, Italy and Scuola Normale Superiore di Pisa, I-56127 Pisa, Italy.
⁶⁴ INFN Sezione di Pisa, I-56127 Pisa, Italy.
⁶⁵ Princeton University, Princeton, New Jersey 08544, USA.
⁶⁶ INFN Sezione di Roma, I-00185 Roma, Italy and Dipartimento di Fisica, Università di Roma La Sapienza, I-00185 Roma, Italy.
⁶⁷ INFN Sezione di Roma, I-00185 Roma, Italy.
⁶⁸ Universität Rostock, D-18051 Rostock, Germany.
⁶⁹ Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom.
⁷⁰ CEA, Irfu, SPP, Centre de Saclay, F-91191 Gif-sur-Yvette, France.
⁷¹ SLAC National Accelerator Laboratory, Stanford, California 94309, USA.
⁷² University of South Carolina, Columbia, South Carolina 29208, USA.
⁷³ Southern Methodist University, Dallas, Texas 75275, USA.
⁷⁴ Stanford University, Stanford, California 94305-4060, USA.
⁷⁵ State University of New York, Albany, New York 12222, USA.
⁷⁶ School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel.
⁷⁷ University of Tennessee, Knoxville, Tennessee 37996, USA.
⁷⁸ University of Texas at Austin, Austin, Texas 78712, USA.
⁷⁹ University of Texas at Dallas, Richardson, Texas 75083, USA.
⁸⁰ INFN Sezione di Torino, I-10125 Torino, Italy and Dipartimento di Fisica Sperimentale, Università di Torino, I-10125 Torino, Italy.
⁸¹ INFN Sezione di Torino, I-10125 Torino, Italy.
⁸² INFN Sezione di Trieste, I-34127 Trieste, Italy and Dipartimento di Fisica, Università di Trieste, I-34127 Trieste, Italy.
⁸³ IFIC, Universitat de Valencia-CSIC, E-46071 Valencia, Spain.
⁸⁴ University of Victoria, Victoria, British Columbia, Canada V8W 3P6.
⁸⁵ Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom.
⁸⁶ University of Wisconsin, Madison, Wisconsin 53706, USA.

PMID: 25166652
DOI: 10.1103/PhysRevLett.111.101802

Abstract

We present results of a search for CP violation in B0- B0 mixing with the BABAR detector. We select a sample of B0→D*- Xℓ+ ν decays with a partial reconstruction method and use kaon tagging to assess the flavor of the other B meson in the event. We determine the CP violating asymmetry ACP≡[N(B0B0)-N(B0B0)]/[N(B0B0)+N(B0B0)]=(0.06±0.17(-0.32)(+0.38))%, corresponding to ΔCP=1-|q/p|=(0.29±0.84(-1.61)(+1.88))×10(-3).