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arXiv · 1911.11740

Measurements of the Absolute Branching Fractions of $B^\pm \to K^\pm X_{c\bar c}$

J. P. Lees·V. Poireau·V. Tisserand·E. Grauges·A. Palano·G. Eigen·D. N. Brown·Yu. G. Kolomensky·M. Fritsch·H. Koch·T. Schroeder·R. Cheaib·C. Hearty·T. S. Mattison·J. A. McKenna·R. Y. So·V. E. Blinov·A. R. Buzykaev·V. P. Druzhinin·V. B. Golubev·E. A. Kozyrev·E. A. Kravchenko·A. P. Onuchin·S. I. Serednyakov·Yu. I. Skovpen·E. P. Solodov·K. Yu. Todyshev·A. J. Lankfordm·B. Dey·J. W. Gary·O. Long·A. M. Eisner·W. S. Lockman·W. Panduro Vazquez·D. S. Chao·C. H. Cheng·B. Echenard·K. T. Flood·D. G. Hitlin·J. Kim·Y. Li·T. S. Miyashita·P. Ongmongkolkul·F. C. Porter·M. Rohrken·Z. Huard·B. T. Meadows·B. G. Pushpawela·M. D. Sokoloff·L. Sun·J. G. Smith·S. R. Wagner·D. Bernard·M. Verderi·D. Bettoni·C. Bozzi·R. Calabrese·G. Cibinetto·E. Fioravanti·I. Garzia·E. Luppi·V. Santoro·A. Calcaterra·R. de Sangro·G. Finocchiaro·S. Martellotti·P. Patteri·I. M. Peruzzi·M. Piccolo·M. Rotondo·A. Zallo·S. Passaggio·C. Patrignani·H. M. Lacker·B. Bhuyan·U. Mallik·C. Chen·J. Cochran·S. Prell·A. V. Gritsan·N. Arnaud·M. Davier·F. Le Diberder·A. M. Lutz·G. Wormser·D. J. Lange·D. M. Wright·J. P. Coleman·D. E. Hutchcroft·D. J. Payne·C. Touramanis·A. J. Bevan·F. Di Lodovico·R. Sacco·G. Cowan·Sw. Banerjee·C. L. Davis·A. G. Denig·W. Gradl·K. Griessinger
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Abstract

A study of the two body decays $B^\pm\rightarrow X_{c\bar c}K^\pm$, where X$_{c\bar c}$ refers to one charmonium state, is reported by BaBar collaboration using a data sample of 424 fb$^{-1}$. The absolute determination of branching fractions for these decays are significantly improved compared to previous BaBaR measurements. Evidence is found for the decay $B^+\rightarrow X(3872)K^+$ at the $3\sigma$ level. The absolute branching fraction ${\cal B}(B^+\rightarrow X(3872)K^+) = (2.1\pm0.6({\rm stat})\pm0.3({\rm syst}))\times 10^{-4}$ is measured for the first time. It follows that ${\cal B}(X(3872)\rightarrow J/\psi\pi^+\pi^-)=(4.1\pm1.3)\%$, supporting the hypothesis of a molecular component for this resonance.

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J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, T. Schroeder, R. Cheaib, C. Hearty, T. S. Mattison, J. A. McKenna, R. Y. So, V. E. Blinov, A. R. Buzykaev, V. P. Druzhinin, V. B. Golubev, E. A. Kozyrev, E. A. Kravchenko, A. P. Onuchin, S. I. Serednyakov, Yu. I. Skovpen, E. P. Solodov, K. Yu. Todyshev, A. J. Lankfordm, B. Dey, J. W. Gary, O. Long, A. M. Eisner, W. S. Lockman, W. Panduro Vazquez, D. S. Chao, C. H. Cheng, B. Echenard, K. T. Flood, D. G. Hitlin, J. Kim, Y. Li, T. S. Miyashita, P. Ongmongkolkul, F. C. Porter, M. Rohrken, Z. Huard, B. T. Meadows, B. G. Pushpawela, M. D. Sokoloff, L. Sun, J. G. Smith, S. R. Wagner, D. Bernard, M. Verderi, D. Bettoni, C. Bozzi, R. Calabrese, G. Cibinetto, E. Fioravanti, I. Garzia, E. Luppi, V. Santoro, A. Calcaterra, R. de Sangro, G. Finocchiaro, S. Martellotti, P. Patteri, I. M. Peruzzi, M. Piccolo, M. Rotondo, A. Zallo, S. Passaggio, C. Patrignani, H. M. Lacker, B. Bhuyan, U. Mallik, C. Chen, J. Cochran, S. Prell, A. V. Gritsan, N. Arnaud, M. Davier, F. Le Diberder, A. M. Lutz, G. Wormser, D. J. Lange, D. M. Wright, J. P. Coleman, D. E. Hutchcroft, D. J. Payne, C. Touramanis, A. J. Bevan, F. Di Lodovico, R. Sacco, G. Cowan, Sw. Banerjee, C. L. Davis, A. G. Denig, W. Gradl, K. Griessinger. 2019-11-26. Measurements of the Absolute Branching Fractions of $B^\pm \to K^\pm X_{c\bar c}$. https://doi.org/10.1103/physrevlett.124.152001

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