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Evidence for the rare decay $B\to K^*\ell^+\ell^-$ and measurement of the $B\to K\ell^+\ell^-$ branching fraction

By B. Aubert, R. Barate, D. Boutigny, J.M. Gaillard, A. Hicheur, Y. Karyotakis, J.P. Lees, P. Robbe, V. Tisserand, A. Zghiche, A. Palano, A. Pompili, J.C. Chen, N.D. Qi, G. Rong, P. Wang, Y.S. Zhu, G. Eigen, I. Ofte, B. Stugu, G.S. Abrams, A.W. Borgland, A.B. Breon, D.N. Brown, J. Button-Shafer, R.N. Cahn, E. Charles, M.S. Gill, A.V. Gritsan, Y. Groysman, R.G. Jacobsen, R.W. Kadel, J. Kadyk, L.T. Kerth, Yu.G. Kolomensky, J.F. Kral, C. Leclerc, M.E. Levi, G. Lynch, L.M. Mir, P.J. Oddone, T.J. Orimoto, M. Pripstein, N.A. Roe, A. Romosan, M.T. Ronan, V.G. Shelkov, A.V. Telnov, W.A. Wenzel, T.J. Harrison, C.M. Hawkes, D.J. Knowles, S.W. O'Neale, R.C. Penny, A.T. Watson, N.K. Watson, T. Deppermann, K. Goetzen, H. Koch, B. Lewandowski, K. Peters, H. Schmuecker, M. Steinke, N.R. Barlow, W. Bhimji, J.T. Boyd, N. Chevalier, P.J. Clark, W.N. Cottingham, C. Mackay, F.F. Wilson, K. Abe, C. Hearty, T.S. Mattison, J.A. McKenna, D. Thiessen, S. Jolly, A.K. McKemey, V.E. Blinov, A.D. Bukin, A.R. Buzykaev, V.B. Golubev, V.N. Ivanchenko, A.A. Korol, E.A. Kravchenko, A.P. Onuchin, S.I. Serednyakov, Yu.I. Skovpen, A.N. Yushkov, D. Best, M. Chao, D. Kirkby, A.J. Lankford, M. Mandelkern, S. McMahon, D.P. Stoker, C. Buchanan, S. Chun, H.K. Hadavand, E.J. Hill, D.B. MacFarlane, H. Paar, S. Prell, S. Rahatlou, G. Raven, V. Sharma, J.W. Berryhill, C. Campagnari, B. Dahmes, P.A. Hart, N. Kuznetsova, S.L. Levy, O. Long, M.A. Mazur, J.D. Richman, W. Verkerke, J. Beringer, A.M. Eisner, M. Grothe, C.A. Heusch, W.S. Lockman, T. Pulliam, T. Schalk, R.E. Schmitz, B.A. Schumm, A. Seiden, M. Turri, W. Walkowiak, D.C. Williams, M.G. Wilson, E. Chen, G.P. Dubois-Felsmann, A. Dvoretskii, D.G. Hitlin, F.C. Porter, A. Ryd, A. Samuel, S. Yang, S. Jayatilleke, G. Mancinelli, B.T. Meadows, M.D. Sokoloff, T. Barillari, P. Bloom, W.T. Ford, U. Nauenberg, A. Olivas, P. Rankin, J. Roy, J.G. Smith, W.C. Van Hoek, L. Zhang, J.L. Harton, T. Hu, M. Krishnamurthy, A. Soffer, W.H. Toki, R.J. Wilson, J. Zhang, D. Altenburg, T. Brandt, J. Brose, T. Colberg, M. Dickopp, R.S. Dubitzky, A. Hauke, E. Maly, R. Muller-Pfefferkorn, S. Otto, K.R. Schubert, R. Schwierz, B. Spaan, L. Wilden, D. Bernard, G.R. Bonneaud, F. Brochard, J. Cohen-Tanugi, P. Grenier, C. Thiebaux, G. Vasileiadis, M. Verderi, A. Anjomshoaa, R. Bernet, A. Khan, D. Lavin, F. Muheim, S. Playfer, J.E. Swain, J. Tinslay, M. Falbo, C. Borean, C. Bozzi, L. Piemontese, A. Sarti, E. Treadwell, F. Anulli, R. Baldini-Ferroli, A. Calcaterra, R. De Sangro, D. Falciai, G. Finocchiaro, P. Patteri, I.M. Peruzzi, M. Piccolo, A. Zallo, S. Bagnasco, A. Buzzo, R. Contri, G. Crosetti, M. Lo Vetere, M. Macri, M.R. Monge, F.C. Pastore, C. Patrignani, E. Robutti, A. Santroni, S. Tosi, S. Bailey, M. Morii, R. Bartoldus, G.J. Grenier, U. Mallik, J. Cochran, H.B. Crawley, J. Lamsa, W.T. Meyer, E.I. Rosenberg, J. Yi, M. Davier, G. Grosdidier, A. Hocker, S. Laplace, F. Le Diberder, V. Lepeltier, A.M. Lutz, T.C. Petersen, Stéphane Plaszczynski, M.H. Schune, L. Tantot, G. Wormser, R.M. Bionta, V. Brigljevic, D.J. Lange, K. Van Bibber, D.M. Wright, A.J. Bevan, J.R. Fry, E. Gabathuler, R. Gamet, M. George, M. Kay, D.J. Payne, R.J. Sloane, C. Touramanis, M.L. Aspinwall, D.A. Bowerman, P.D. Dauncey, U. Egede, I. Eschrich, G.W. Morton, J.A. Nash, P. Sanders, D. Smith, G.P. Taylor, J.J. Back, G. Bellodi, P. Dixon, P.F. Harrison, R.J.L. Potter, H.W. Shorthouse, P. Strother, P.B. Vidal, G. Cowan, H.U. Flaecher, S. George, M.G. Green, A. Kurup, C.E. Marker, T.R. McMahon, S. Ricciardi, F. Salvatore, G. Vaitsas, M.A. Winter, D. Brown, C.L. Davis, J. Allison, R.J. Barlow, A.C. Forti, F. Jackson, G.D. Lafferty, A.J. Lyon, N. Savvas, J.H. Weatherall, J.C. Williams, A. Farbin, A. Jawahery, V. Lillard, D.A. Roberts, J.R. Schieck, G. Blaylock, C. Dallapiccola, K.T. Flood, S.S. Hertzbach, R. Kofler, V.B. Koptchev, T.B. Moore, H. Staengle, S. Willocq, B. Brau, R. Cowan, G. Sciolla, F. Taylor, R.K. Yamamoto, M. Milek, P.M. Patel, F. Palombo, J.M. Bauer, L. Cremaldi, V. Eschenburg, R. Kroeger, J. Reidy, D.A. Sanders, D.J. Summers, C. Hast, P. Taras, H. Nicholson, N. Cavallo, G. De Nardo, F. Fabozzi, C. Gatto, L. Lista, P. Paolucci, D. Piccolo, C. Sciacca, J.M. LoSecco, J.R.G. Alsmiller, T.A. Gabriel, J. Brau, R. Frey, M. Iwasaki, C.T. Potter, N.B. Sinev, D. Strom, E. Torrence, F. Colecchia, A. Dorigo, F. Galeazzi, M. Margoni, M. Morandin, M. Posocco, M. Rotondo, F. Simonetto, R. Stroili, C. Voci, M. Benayoun, H. Briand, J. Chauveau, P. David, C. De La Vaissiere, L. Del Buono, O. Hamon, M.J.J. John, P. Leruste, J. Ocariz, M. Pivk, L. Roos, J. Stark, S. T'Jampens, G. Therin, P.F. Manfredi, V. Re, V. Speziali, L. Gladney, Q.H. Guo, J. Panetta, C. Angelini, G. Batignani, S. Bettarini, M. Bondioli, F. Bucci, G. Calderini, E. Campagna, M. Carpinelli, F. Forti, M.A. Giorgi, A. Lusiani, G. Marchiori, F. Martinez-Vidal, M. Morganti, N. Neri, E. Paoloni, M. Rama, G. Rizzo, F. Sandrelli, G. Triggiani, J. Walsh, M. Haire, D. Judd, K. Paick, L. Turnbull, D.E. Wagoner, J. Albert, N. Danielson, P. Elmer, C. Lu, V. Miftakov, J. Olsen, S.F. Schaffner, A.J.S. Smith, A. Tumanov, E.W. Varnes, F. Bellini, G. Cavoto, D. Del Re, R. Faccini, F. Ferrarotto, F. Ferroni, E. Leonardi, S. Morganti, G. Piredda, F. Safai Tehrani, M. Serra, C. Voena, S. Christ, G. Wagner, R. Waldi, T. Adye, N. De Groot, B. Franek, N.I. Geddes, G.P. Gopal, S.M. Xella, R. Aleksan, S. Emery, A. Gaidot, P.F. Giraud S.F. Ganzhur, G. Hamel De Monchenault, W. Kozanecki, M. Langer, M. Legendre, G.W. London, B. Mayer, G. Schott, G. Vasseur, C. Yeche, M. Zito, M.V. Purohit, A.W. Weidemann, F.X. Yumiceva, I. Adam, D. Aston, N. Berger, A.M. Boyarski, M.R. Convery, D.P. Coupal, D. Dong, J. Dorfan, W. Dunwoodie, R.C. Field, T. Glanzman, S.J. Gowdy, E. Grauges, T. Haas, T. Hadig, V. Halyo, T. Himel, T. Hrynova, M.E. Huffer, W.R. Innes, C.P. Jessop, M.H. Kelsey, P. Kim, M.L. Kocian, U. Langenegger, D.W.G.S. Leith, S. Luitz, V. Luth, H.L. Lynch, H. Marsiske, S. Menke, R. Messner, D.R. Muller, C.P. O'Grady, V.E. Ozcan, A. Perazzo, M. Perl, S. Petrak, H. Quinn, B.N. Ratcliff, S.H. Robertson, A. Roodman, A.A. Salnikov, T. Schietinger, R.H. Schindler, J. Schwiening, G. Simi, A. Snyder, A. Soha, S.M. Spanier, J. Stelzer, D. Su, M.K. Sullivan, H.A. Tanaka, J. Vavra, S.R. Wagner, M. Weaver, A.J.R. Weinstein, W.J. Wisniewski, D.H. Wright, C.C. Young, P.R. Burchat, C.H. Cheng, T.I. Meyer, C. Roat, R. Henderson, W. Bugg, H. Cohn, J.M. Izen, I. Kitayama, X.C. Lou, F. Bianchi, M. Bona, D. Gamb, L. Bosisio, G. Della Ricca, S. Dittongo, L. Lanceri, P. Poropat, L. Vitale, G. Vuagnin, R.S. Panvini, S. Banerjee, C.M. Brown, D. Fortin, P.D. Jackson, R. Kowalewski, J.M. Roney, H.R. Band, S. Dasu, M. Datta, A.M. Eichenbaum, H. Hu, J.R. Johnson, R. Liu, F. Di Lodovico, A. Mohapatra, Y. Pan, R. Prepost, I.J. Scott, S.J. Sekula, J.H. Von Wimmersperg-Toeller, J. Wu, S.L. Wu, Z. Yu and H. Neal

Abstract

We present evidence for the flavor-changing neutral current decay $B\to K^*\ell^+\ell^-$ and a measurement of the branching fraction for the related process $B\to K\ell^+\ell^-$, where $\ell^+\ell^-$ is either an $e^+e^-$ or $\mu^+\mu^-$ pair. These decays are highly suppressed in the Standard Model, and they are sensitive to contributions from new particles in the intermediate state. The data sample comprises $123\times 10^6$ $\Upsilon(4S)\to B\bar{B}$ decays collected with the Babar detector at the PEP-II $e^+e^-$ storage ring. Averaging over $K^{(*)}$ isospin and lepton flavor, we obtain the branching fractions ${\mathcal B}(B\to K\ell^+\ell^-)=(0.65^{+0.14}_{-0.13}\pm 0.04)\times 10^{-6}$ and ${\mathcal B}(B\to K^*\ell^+\ell^-)=(0.88^{+0.33}_{-0.29}\pm 0.10)\times 10^{-6}$, where the uncertainties are statistical and systematic, respectively. The significance of the $B\to K\ell^+\ell^-$ signal is over $8\sigma$, while for $B\to K^*\ell^+\ell^-$ it is $3.3\sigma$

Topics: [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: American Physical Society
Year: 2003
OAI identifier: oai:HAL:in2p3-00022296v1
Provided by: Hal-Diderot
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