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arXiv · 1108.3211

Observation of the baryonic B decay B0bar --> Lambda_c^+ anti-Lambda K-

The BABAR Collaboration·J. P. Lees·V. Poireau·V. Tisserand·J. Garra Tico·E. Grauges·M. Martinelli·D. A. Milanes·A. Palano·M. Pappagallo·G. Eigen·B. Stugu·L. Sun·D. N. Brown·L. T. Kerth·Yu. G. Kolomensky·G. Lynch·H. Koch·T. Schroeder·D. J. Asgeirsson·C. Hearty·T. S. Mattison·J. A. McKenna·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·M. Bondioli·D. Kirkby·A. J. Lankford·M. Mandelkern·D. P. Stoker·H. Atmacan·J. W. Gary·F. Liu·O. Long·G. M. Vitug·C. Campagnari·T. M. Hong·D. Kovalskyi·J. D. Richman·C. A. West·A. M. Eisner·J. Kroseberg·W. S. Lockman·A. J. Martinez·T. Schalk·B. A. Schumm·A. Seiden·C. H. Cheng·D. A. Doll·B. Echenard·K. T. Flood·D. G. Hitlin·P. Ongmongkolkul·F. C. Porter·A. Y. Rakitin·R. Andreassen·M. S. Dubrovin·Z. Huard·B. T. Meadows·M. D. Sokoloff·P. C. Bloom·W. T. Ford·A. Gaz·M. Nagel·U. Nauenberg·J. G. Smith·S. R. Wagner·R. Ayad·W. H. Toki·B. Spaan·M. J. Kobel·K. R. Schubert·R. Schwierz·D. Bernard·M. Verderi·P. J. Clark·S. Playfer·D. Bettoni·C. Bozzi·R. Calabrese·G. Cibinetto·E. Fioravanti·I. Garzia·E. Luppi·M. Munerato·M. Negrini·L. Piemontese·R. Baldini-Ferroli·A. Calcaterra·R. de Sangro
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Abstract

We report the observation of the baryonic B decay B0bar --> Lambda_c^+ anti-Lambda K- with a significance larger than 7 standard deviations based on 471x10^6$ BBbar pairs collected with the BABAR detector at the PEP-II storage ring at SLAC. We measure the branching fraction for the decay B0bar --> Lambda_c^+ anti-Lambda K- to be (3.8 \pm 0.8_{stat} \pm 0.2_{sys} \pm 1.0_{Lambda_c^+})x10^{-5}. The uncertainties are statistical, systematic, and due to the uncertainty in the Lambda_c^+ branching fraction. We find that the Lambda_c^+ K^- invariant mass distribution shows an enhancement above 3.5 GeV/c^2.

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The BABAR Collaboration, J. P. Lees, V. Poireau, V. Tisserand, J. Garra Tico, E. Grauges, M. Martinelli, D. A. Milanes, A. Palano, M. Pappagallo, G. Eigen, B. Stugu, L. Sun, D. N. Brown, L. T. Kerth, Yu. G. Kolomensky, G. Lynch, H. Koch, T. Schroeder, D. J. Asgeirsson, C. Hearty, T. S. Mattison, J. A. McKenna, 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, M. Bondioli, D. Kirkby, A. J. Lankford, M. Mandelkern, D. P. Stoker, H. Atmacan, J. W. Gary, F. Liu, O. Long, G. M. Vitug, C. Campagnari, T. M. Hong, D. Kovalskyi, J. D. Richman, C. A. West, A. M. Eisner, J. Kroseberg, W. S. Lockman, A. J. Martinez, T. Schalk, B. A. Schumm, A. Seiden, C. H. Cheng, D. A. Doll, B. Echenard, K. T. Flood, D. G. Hitlin, P. Ongmongkolkul, F. C. Porter, A. Y. Rakitin, R. Andreassen, M. S. Dubrovin, Z. Huard, B. T. Meadows, M. D. Sokoloff, P. C. Bloom, W. T. Ford, A. Gaz, M. Nagel, U. Nauenberg, J. G. Smith, S. R. Wagner, R. Ayad, W. H. Toki, B. Spaan, M. J. Kobel, K. R. Schubert, R. Schwierz, D. Bernard, M. Verderi, P. J. Clark, S. Playfer, D. Bettoni, C. Bozzi, R. Calabrese, G. Cibinetto, E. Fioravanti, I. Garzia, E. Luppi, M. Munerato, M. Negrini, L. Piemontese, R. Baldini-Ferroli, A. Calcaterra, R. de Sangro. 2011-08-16. Observation of the baryonic B decay B0bar --> Lambda_c^+ anti-Lambda K-. https://doi.org/10.1103/physrevd.84.071102

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