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arXiv · 1905.00608

Search for rare or forbidden decays of the $D^{0}$ meson

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. Lankford·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. Röhrken·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·E. Gabathuler·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
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Abstract

We present a search for nine lepton-number-violating and three lepton-flavor-violating neutral charm decays of the type $D^0\rightarrow h^{\prime -} h^{-}\ell^{\prime +} \ell^{+}$ and $D^0\rightarrow h^{\prime -} h^{+}\ell^{\prime\pm} \ell^{\mp}$, where $h$ and $h^{\prime}$ represent a $K$ or $\pi$ meson and $\ell$ and $\ell^{\prime}$ an electron or muon. The analysis is based on $468$ fb$^{-1}$ of $e^+e^-$ annihilation data collected at or close to the $Y(4S)$ resonance with the BaBar detector at the SLAC National Accelerator Laboratory. No significant signal is observed for any of the twelve modes and we establish 90% confidence level upper limits on the branching fractions in the range $(1.0 - 30.6)\times 10^{-7}$. The limits are between one and three orders of magnitude times more stringent than previous measurements.

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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. Lankford, 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. Röhrken, 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, E. Gabathuler, 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. 2019-05-02. Search for rare or forbidden decays of the $D^{0}$ meson. https://doi.org/10.1103/physrevlett.124.071802

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