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Phys Rev Lett. 2007 Jul 13;99(2):021603. Epub 2007 Jul 12.

Observation of CP violation in B(0) --> K(+)pi(-) and B(0) --> pi(+)pi(-).

Aubert B, Bona M, Boutigny D, Karyotakis Y, Lees JP, Poireau V, Prudent X, Tisserand V, Zghiche A, Garra Tico J, Grauges E, Lopez L, Palano A, Eigen G, Ofte I, Stugu B, Sun L, Abrams GS, Battaglia M, Brown DN, Button-Shafer J, Cahn RN, Groysman Y, Jacobsen RG, Kadyk JA, Kerth LT, Kolomensky YG, Kukartsev G, Lopes Pegna D, Lynch G, Mir LM, Orimoto TJ, Pripstein M, Roe NA, Ronan MT, Tackmann K, Wenzel WA, Del Amo Sanchez P, Hawkes CM, Watson AT, Held T, Koch H, Lewandowski B, Pelizaeus M, Schroeder T, Steinke M, Cottingham WN, Walker D, Asgeirsson DJ, Cuhadar-Donszelmann T, Fulsom BG, Hearty C, Knecht NS, Mattison TS, McKenna JA, Khan A, Saleem M, Teodorescu L, Blinov VE, Bukin AD, Druzhinin VP, Golubev VB, Onuchin AP, Serednyakov SI, Skovpen YI, Solodov EP, Todyshev KY, Bondioli M, Curry S, Eschrich I, Kirkby D, Lankford AJ, Lund P, Mandelkern M, Martin EC, Stoker DP, Abachi S, Buchanan C, Foulkes SD, Gary JW, Liu F, Long O, Shen BC, Zhang L, Paar HP, Rahatlou S, Sharma V, Berryhill JW, Campagnari C, Cunha A, Dahmes B, Hong TM, Kovalskyi D, Richman JD, Beck TW, Eisner AM, Flacco CJ, Heusch CA, Kroseberg J, Lockman WS, Schalk T, Schumm BA, Seiden A, Williams DC, Wilson MG, Winstrom LO, Chen E, Cheng CH, Dvoretskii A, Fang F, Hitlin DG, Narsky I, Piatenko T, Porter FC, Mancinelli G, Meadows BT, Mishra K, Sokoloff MD, Blanc F, Bloom PC, Chen S, Ford WT, Hirschauer JF, Kreisel A, Nagel M, Nauenberg U, Olivas A, Smith JG, Ulmer KA, Wagner SR, Zhang J, Gabareen AM, Soffer A, Toki WH, Wilson RJ, Winklmeier F, Zeng Q, Altenburg DD, Feltresi E, Hauke A, Jasper H, Merkel J, Petzold A, Spaan B, Wacker K, Brandt T, Klose V, Lacker HM, Mader WF, Nogowski R, Schubert J, Schubert KR, Schwierz R, Sundermann JE, Volk A, Bernard D, Bonneaud GR, Latour E, Lombardo V, Thiebaux Ch, Verderi M, Clark PJ, Gradl W, Muheim F, Playfer S, Robertson AI, Xie Y, Andreotti M, Bettoni D, Bozzi C, Calabrese R, Cecchi A, Cibinetto G, Franchini P, Luppi E, Negrini M, Petrella A, Piemontese L, Prencipe E, Santoro V, Anulli F, Baldini-Ferroli R, Calcaterra A, de Sangro R, Finocchiaro G, Pacetti S, Patteri P, Peruzzi IM, Piccolo M, Rama M, Zallo A, Buzzo A, Contri R, Lo Vetere M, Macri MM, Monge MR, Passaggio S, Patrignani C, Robutti E, Santroni A, Tosi S, Chaisanguanthum KS, Morii M, Wu J, Dubitzky RS, Marks J, Schenk S, Uwer U, Bard DJ, Dauncey PD, Flack RL, Nash JA, Nikolich MB, Panduro Vazquez W, Behera PK, Chai X, Charles MJ, Mallik U, Meyer NT, Ziegler V, Cochran J, Crawley HB, Dong L, Eyges V, Meyer WT, Prell S, Rosenberg EI, Rubin AE, Gritsan AV, Guo ZJ, Lae CK, Denig AG, Fritsch M, Schott G, Arnaud N, Béquilleux J, Davier M, Grosdidier G, Höcker A, Lepeltier V, Le Diberder F, Lutz AM, Pruvot S, Rodier S, Roudeau P, Schune MH, Serrano J, Sordini V, Stocchi A, Wang WF, Wormser G, Lange DJ, Wright DM, Chavez CA, Forster IJ, Fry JR, Gabathuler E, Gamet R, Hutchcroft DE, Payne DJ, Schofield KC, Touramanis C, Bevan AJ, George KA, Di Lodovico F, Menges W, Sacco R, Cowan G, Flaecher HU, Hopkins DA, Jackson PS, McMahon TR, Salvatore F, Wren AC, Brown DN, Davis CL, Allison J, Barlow NR, Barlow RJ, Chia YM, Edgar CL, Lafferty GD, West TJ, Yi JI, Anderson J, Chen C, Jawahery A, Roberts DA, Simi G, Tuggle JM, Blaylock G, Dallapiccola C, Hertzbach SS, Li X, Moore TB, Salvati E, Saremi S, Cowan R, Fisher PH, Sciolla G, Sekula SJ, Spitznagel M, Taylor F, Yamamoto RK, McLachlin SE, Patel PM, Robertson SH, Lazzaro A, Palombo F, Bauer JM, Cremaldi L, Eschenburg V, Godang R, Kroeger R, Sanders DA, Summers DJ, Zhao HW, Brunet S, Côté D, Simard M, Taras P, Viaud FB, Nicholson H, De Nardo G, Fabozzi F, Lista L, Monorchio D, Sciacca C, Baak MA, Raven G, Snoek HL, Jessop CP, Losecco JM, Benelli G, Corwin LA, Gan KK, Honscheid K, Hufnagel D, Kagan H, Kass R, Morris JP, Rahimi AM, Regensburger JJ, Ter-Antonyan R, Wong QK, Blount NL, Brau J, Frey R, Igonkina O, Kolb JA, Lu M, Rahmat R, Sinev NB, Strom D, Strube J, Torrence E, Gagliardi N, Gaz A, Margoni M, Morandin M, Pompili A, 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Abstract

We report observations of CP violation in the decays B(0) --> K(+)pi(-) and B(0) --> pi(+)pi(-) in a sample of 383 x 10(6) Upsilon(4S) --> BB[over] events. We find 4372+/-82 B(0) --> K(+)pi(-) decays and measure the direct CP-violating charge asymmetry A(Kpi) = -0.107+/-0.018(stat)(-0.004)(+0.007)(syst), which excludes the CP-conserving hypothesis with a significance of 5.5 standard deviations. In the same sample, we find 1139+/-49 B(0) --> pi(+)pi(-) decays and measure the CP-violating asymmetries S(pipi) = -0.60+/-0.11(stat)+/-0.03(syst) and C(pipi) = -0.21+/-0.09(stat)+/-0.02(syst). CP conservation in B(0) --> pi(+)pi(-) (S(pipi) = C(pipi) = 0) is excluded at a confidence level 1-C.L. = 8 x 10(-8), corresponding to 5.4 standard deviations.

PMID:
17678212
DOI:
10.1103/PhysRevLett.99.021603
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