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Measurement of the branching fraction and Λ̅ polarization in B^0→Λ̅ pπ^-

Aubert, B. and Karyotakis, Y. and Lees, J. P. and Poireau, V. and Prencipe, E. and Prudent, X. and Tisserand, V. and Garra Tico, J. and Grauges, E. and Martinelli, M. and Palano, A. and Pappagallo, M. and Eigen, G. and Stugu, B. and Sun, L. and Battaglia, M. and Brown, D. N. and Kerth, L. T. and Kolomensky, Yu. G. and Lynch, G. and Osipenkov, I. L. and Tackmann, K. and Tanabe, T. and Hawkes, C. M. and Soni, N. and Watson, A. T. and Koch, H. and Schroeder, T. and Asgeirsson, D. J. and Fulsom, B. G. and Hearty, C. and Mattison, T. S. and McKenna, J. A. and Barrett, M. and Khan, A. and Randle-Conde, A. and Blinov, V. E. and Bukin, A. D. and Buzykaev, A. R. and Druzhinin, V. P. and Golubev, V. B. and Onuchin, A. P. and Serednyakov, S. I. and Skovpen, Yu. I. and Solodov, E. P. and Todyshev, K. Yu. and Bondioli, M. and Curry, S. and Eschrich, I. and Kirkby, D. and Lankford, A. J. and Lund, P. and Mandelkern, M. and Martin, E. C. and Schultz, J. and Stoker, D. P. and Atmacan, H. and Gary, J. W. and Liu, F. and Long, O. and Vitug, G. M. and Yasin, Z. and Zhang, L. and Sharma, V. and Campagnari, C. and Hong, T. M. and Kovalskyi, D. and Mazur , M. A. and Richman, J. D. and Beck, T. W. and Eisner, A. M. and Heusch, C. A. and Kroseberg, J. and Lockman, W. S. and Martinez, A. J. and Schalk, T. and Schumm, B. A. and Seiden, A. and Wang, L. and Winstrom, L. O. and Cheng, C. H. and Doll, D. A. and Echenard, B. and Fang, F. and Hitlin, D. G. and Narsky, I. and Piatenko, T. and Porter, F. C. and Andreassen, R. and Mancinelli, G. and Meadows, B. T. and Mishra, K. and Sokoloff, M. D. and Bloom, P. C. and Ford, W. T. and Gaz, A. and Hirschauer, J. F. and Nagel, M. and Nauenberg, U. and Smith, J. G. and Wagner, S. R. and Ayad, R. and Toki, W. H. and Wilson, R. J. and Feltresi, E. and Hauke, A. and Jasper, H. and Karbach, T. M. and Merkel, J. and Petzold, A. and Spaan, B. and Wacker, K. and Kobel, M. J. and Nogowski, R. and Schubert, K. R. and Schwierz, R. and Volk, A. and Bernard, D. and Latour, E. and Verderi, M. and Clark, P. J. and Playfer, S. and Watson, J. E. and Andreotti, M. and Bettoni, D. and Bozzi, C. and Calabrese, R. and Cecchi, A. and Cibinetto, G. and Fioravanti, E. and Franchini, P. and Luppi, E. and Munerato, M. and Negrini, M. and Petrella, A. and Piemontese, L. and Santoro, V. and Baldini-Ferroli, R. and Calcaterra, A. and De Sangro, R. and Finocchiaro, G. and Pacetti, S. and Patteri, P. and Peruzzi, I. M. and Piccolo, M. and Rama, M. and Zallo, A. and Contri, R. and Guido, E. and Lo Vetere, M. and Monge, M. R. and Passaggio, S. and Patrignani, C. and Robutti, E. and Tosi, S. and Chaisanguanthum, K. S. and Morii, M. and Adametz, A. and Marks, J. and Schenk, S. and Uwer, U. and Bernlochner, F. U. and Klose, V. and Lacker, H. M. and Bard, D. J. and Dauncey, P. D. and Tibbetts, M. and Behera, P. K. and Charles, M. J. and Mallik, U. and Cochran, J. and Crawley, H. B. and Dong, L. and Eyges, V. and Meyer, W. T. and Prell, S. and Rosenberg, E. I. and Rubin, A. E. and Gao, Y. Y. and Gritsan, A. V. and Guo, Z. J. and Arnaud, N. and Béquilleux, J. and D'Orazio, A. and Davier, M. and Derkach, D. and Firmino da Costa, J. and Grosdidier, G. and Le Diberder, F. and Lepeltier, V. and Lutz, A. M. and Malaescu, B. and Pruvot, S. and Roudeau, P. and Schune, M. H. and Serrano, J. and Sordini, V. and Stocchi, A. and Wormser, G. and Lange, D. J. and Wright, D. M. and Bingham, I. and Burke, J. P. and Chavez, C. A. and Fry, J. R. and Gabathuler, E. and Gamet, R. and Hutchcroft, D. E. and Payne, D. J. and Touramanis, C. and Bevan, A. J. and Clarke, C. K. and Di Lodovico, F. and Sacco, R. and Sigamani, M. and Cowan, G. and Paramesvaran, S. and Wren, A. C. and Brown, D. N. and Davis, C. L. and Denig, A. G. and Fritsch, M. and Gradl, W. and Hafner, A. and Alwyn, K. E. and Bailey, D. and Barlow, R. J. and Jackson, G. and Lafferty, G. D. and West, T. J. and Yi, J. I. and Anderson, J. and Chen, C. and Jawahery, A. and Roberts, D. A. and Simi, G. and Tuggle, J. M. and Dallapiccola, C. and Salvati, E. and Saremi, S. and Cowan, R. and Dujmic, D. and Fisher, P. H. and Henderson, S. W. and Sciolla, G. and Spitznagel, M. and Yamamoto, R. K. and Zhao, M. and Patel, P. M. and Robertson, S. H. and Schram, M. and Lazzaro, A. and Lombardo, V. and Palombo, F. and Stracka, S. and Bauer, J. M. and Cremaldi, L. and Godang, R. and Kroeger, R. and Sonnek, P. and Summers, D. J. and Zhao, H. W. and Simard, M. and Taras, P. and Nicholson, H. and De Nardo, G. and Lista, L. and Monorchio, D. and Onorato, G. and Sciacca, C. and Raven, G. and Snoek, H. L. and Jessop, C. P. and Knoepfel, K. J. and LoSecco, J. M. and Wang, W. F. and Corwin, L. A. and Honscheid, K. and Kagan, H. and Kass, R. and Morris, J. P. and Rahimi, A. M. and Regensburger, J. J. and Sekula, S. J. and Wong, Q. K. and Blount, N. L. and Brau, J. and Frey, R. and Igonkina, O. and Kolb, J. A. and Lu, M. and Rahmat, R. and Sinev, N. B. and Strom, D. and Strube, J. and Torrence, E. and Castelli, G. and Gagliardi, N. and Margoni, M. and Morandin, M. and Posocco, M. and Rotondo, M. and Simonetto, F. and Stroili, R. and Voci, C. and del Amo Sanchez, P. and Ben-Haim, E. and Bonneaud, G. R. and Briand, H. and Chauveau, J. and Hamon, O. and Leruste, Ph. and Marchiori, G. and Ocariz, J. and Perez, A. and Prendki, J. and Sitt, S. and Gladney, L. and Biasini, M. and Manoni, E. and Angelini, C. and Batignani, G. and Bettarini, S. and Calderini, G. and Carpinelli, M. and Cervelli, A. and Forti, F. and Giorgi, M. A. and Lusiani, A. and Morganti, M. and Neri, N. and Paoloni, E. and Rizzo, G. and Walsh, J. J. and Lopes-Pegna, D. and Lu, C. and Olsen, J. and Smith, A. J. S. and Telnov, A. V. and Anulli, F. and Baracchini, E. and Cavoto, G. and Faccini, R. and Ferrarotto, F. and Ferroni, F. and Gaspero, M. and Jackson, P. D. and Li Gioi, L. and Mazzoni, M. A. and Morganti, S. and Piredda, G. and Renga, F. and Voena, C. and Ebert, M. and Hartmann, T. and Schröder, H. and Waldi, R. and Adye, T. and Franek, B. and Olaiya, E. O. and Wilson, F. F. and Emery, S. and Esteve, L. and Hamel de Monchenault, G. and Kozanecki, W. and Vasseur, G. and Yèche, Ch. and Zito, M. and Allen, M. T. and Aston, D. and Bartoldus, R. and Benitez, J. F. and Cenci, R. and Coleman, J. P. and Convery, M. R. and Dingfelder, J. C. and Dorfan, J. and Dubois-Felsmann, G. P. and Dunwoodie, W. and Field, R. C. and Franco Sevilla, M. and Gabareen, A. M. and Graham, M. T. and Grenier, P. and Hast, C. and Innes, W. R. and Kaminski, J. and Kelsey, M. H. and Kim, H. and Kim, P. and Kocian, M. L. and Leith, D. W. G. S. and Li, S. and Lindquist, B. and Luitz, S. and Luth, V. and Lynch, H. L. and MacFarlane, D. B. and Marsiske, H. and Messner, R. and Muller, D. R. and Neal, H. and Nelson, S. and O'Grady, C. P. and Ofte, I. and Perl, M. and Ratcliff, B. N. and Roodman, A. and Salnikov, A. A. and Schindler, R. H. and Schwiening, J. and Snyder, A. and Su, D. and Sullivan, M. K. and Suzuki, K. and Swain, S. K. and Thompson, J. M. and Va'vra, J. and Wagner, A. P. and Weaver, M. and West, C. A. and Wisniewski, W. J. and Wittgen, M. and Wright, D. H. and Wulsin, H. W. and Yarritu, A. K. and Young, C. C. and Ziegler, V. and Chen, X. R. and Liu, H. and Park, W. and Purohit, M. V. and White, R. M. and WIlson, J. R. and Burchat, P. R. and Edwards, A. J. and Miyashita, T. S. and Ahmed, S. and Alam, M. S. and Ernst, J. A. and Pan, B. and Saeed, M. A. and Zain, S. B. and Soffer, A. and Spanier, S. M. and Wogsland, B. J. and Eckmann, R. and Ritchie, J. L. and Ruland, A. M. and Schilling, C. J. and Schwitters, R. F. and Wray, B. C. and Drummond, B. W. and Izen, J. M. and Lou, X. C. and Bianchi, F. and Gamba, D. and Pelliccioni, M. and Bomben, M. and Bosisio, L. and Cartaro, C. and Della-Ricca, G. and Lanceri, L. and Vitale, L. and Azzolini, V. and Lopez-March, N. and Martinez-Vidal, F. and Milanes, D. A. and Oyanguren, A. and Albert, J. and Banerjee, Sw. and Bhuyan, B. and Choi, H. H. F. and Hamano, K. and King, G. J. and Kowalewski, R. and Lewczuk, M. J. and Nugent, I. M. and Roney, J. M. and Sobie, R. J. and Gershon, T. J. and Harrison, P. F. and Ilic, J. and Latham, T. E. and Mohanty, G. B. and Puccio, E. M. T. and Band, H. R. and Chen, X. and Dasu, S. and Flood, K. T. and Pan, Y. and Prepost, R. and Vuosalo, C. O. and Wu, S. L. (2009) Measurement of the branching fraction and Λ̅ polarization in B^0→Λ̅ pπ^-. Physical Review D, 79 (11). Art. No. 112009. ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:20100419-112308025

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Abstract

We present a measurement of the B^0→Λ̅ pπ^- branching fraction performed using the BABAR detector at the PEP-II asymmetric e^+e^- collider. Based on a sample of 467×10^6 BB̅ pairs we measure B(B^0→Λ̅ pπ^-)=[3.07±0.31 (stat)±0.23 (syst)]×10^(-6). The measured differential spectrum as a function of the dibaryon invariant mass m(Λ̅ p) shows a near-threshold enhancement similar to that observed in other baryonic B decays. We study the Λ̅ polarization as a function of Λ̅ energy in the B^0 rest frame (E^*_Λ̅ ) and compare it with theoretical expectations of fully longitudinally right-polarized Λ̅ at large E^*_Λ̅ .


Item Type:Article
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URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevD.79.112009DOIUNSPECIFIED
http://prd.aps.org/abstract/PRD/v79/i11/e112009PublisherUNSPECIFIED
Additional Information:© 2009 The American Physical Society. Received 30 April 2009; published 19 June 2009. We are grateful for the extraordinary contributions of our PEP-II colleagues in achieving the excellent luminosity and machine conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and the kind hospitality extended to them. This work is supported by the U.S. Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), the Commissariat à l’Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France), the Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), the Istituto Nazionale di Fisica Nucleare (Italy), the Foundation for Fundamental Research on Matter (The Netherlands), the Research Council of Norway, the Ministry of Education and Science of the Russian Federation, Ministerio de Educaciόn y Ciencia (Spain), and the Science and Technology Facilities Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union) and the A. P. Sloan Foundation.
Funders:
Funding AgencyGrant Number
U.S. Department of EnergyUNSPECIFIED
NSFUNSPECIFIED
Natural Sciences and Engineering Research Council (Canada)UNSPECIFIED
Commissariat à l’Energie Atomique (France)UNSPECIFIED
Institut National de Physique Nucléaire et de Physique des Particules (France)UNSPECIFIED
Bundesministerium für Bildung und Forschung (Germany)UNSPECIFIED
Deutsche Forschungsgemeinschaft (Germany)UNSPECIFIED
Istituto Nazionale di Fisica Nucleare (Italy)UNSPECIFIED
Foundation for Fundamental Research on Matter (The Netherlands)UNSPECIFIED
Research Council of NorwayUNSPECIFIED
Ministry of Education and Science of the Russian FederationUNSPECIFIED
Ministerio de Educaciόn y Ciencia (Spain)UNSPECIFIED
Science and Technology Facilities Council (United Kingdom)UNSPECIFIED
Marie-Curie IEF program (European Union)UNSPECIFIED
A. P. Sloan FoundationUNSPECIFIED
Classification Code:PACS: 13.25.Hw, 13.60.Rj
Record Number:CaltechAUTHORS:20100419-112308025
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100419-112308025
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18018
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:21 Apr 2010 15:45
Last Modified:26 Dec 2012 11:58

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