Search for B^+ to e^+ ν and B^+ to μ^+ ν decays using hadronic tagging

Belle Collaboration: Y. Yook , Y.-J. Kwon , A. Abdesselam , I. Adachi , S. Al Said , K. Arinstein , D. M. Asner , V. Aulchenko

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T. Aushev R. Ayad S. Bahinipati A. M. Bakich A. Bala V. Bansal V. Bhardwaj B. Bhuyan A. Bondar G. Bonvicini A. Bozek M. Bra\v{c}ko T. E. Browder D. \v{C}ervenkov V. Chekelian A. Chen B. G. Cheon K. Chilikin R. Chistov K. Cho V. Chobanova Y. Choi Z. Dole\v{z}al Z. Dr\'asal A. Drutskoy D. Dutta K. Dutta S. Eidelman H. Farhat J. E. Fast T. Ferber O. Frost V. Gaur N. Gabyshev S. Ganguly A. Garmash R. Gillard R. Glattauer Y. M. Goh B. Golob O. Grzymkowska J. Haba K. Hara K. Hayasaka H. Hayashii X. H. He M. Heck T. Higuchi Y. Horii Y. Hoshi W.-S. Hou T. Iijima A. Ishikawa R. Itoh Y. Iwasaki T. Iwashita I. Jaegle T. Julius E. Kato P. Katrenko T. Kawasaki C. Kiesling D. Y. Kim J. B. Kim J. H. Kim K. T. Kim M. J. Kim Y. J. Kim K. Kinoshita J. Klucar B. R. Ko P. Kody\v{s} S. Korpar P. Kri\v{z}an P. Krokovny T. Kuhr A. Kuzmin J. S. Lange Y. Li L. Li Gioi C. Liu Y. Liu D. Liventsev P. Lukin K. Miyabayashi H. Miyata G. B. Mohanty A. Moll R. Mussa Y. Nagasaka I. Nakamura E. Nakano M. Nakao Z. Natkaniec M. Nayak E. Nedelkovska N. K. Nisar S. Nishida O. Nitoh S. Ogawa S. Okuno P. Pakhlov C.-S. Park H. Park H. K. Park T. K. Pedlar R. Pestotnik M. Petri\v{c} L. E. Piilonen M. Ritter M. R\"ohrken A. Rostomyan S. Ryu T. Saito Y. Sakai S. Sandilya L. Santelj T. Sanuki Y. Sato V. Savinov O. Schneider G. Schnell C. Schwanda K. Senyo O. Seon M. E. Sevior V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu B. Shwartz A. Sibidanov F. Simon Y.-S. Sohn A. Sokolov E. Solovieva M. Stari\v{c} M. Steder M. Sumihama T. Sumiyoshi G. Tatishvili Y. Teramoto K. Trabelsi M. Uchida T. Uglov P. Urquijo Y. Usov C. Van Hulse P. Vanhoefer G. Varner K. E. Varvell A. Vinokurova V. Vorobyev M. N. Wagner C. H. Wang M.-Z. Wang P. Wang X. L. Wang M. Watanabe Y. Watanabe S. Wehle K. M. Williams E. Won Y. Yamashita S. Yashchenko Y. Yusa Z. P. Zhang V. Zhilich A. Zupanc

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classification ✦ hep-ex

keywords decaytimesdecayshadronicsearchsignalupsilonanalyzed

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We present a search for the rare leptonic decays $B^+ \to e^+ \nu_e$ and $B^+ \to \mu^+ \nu_\mu$, using the full $\Upsilon(4S)$ data sample of $772\times 10^6$ $B\bar{B}$ pairs collected with the Belle detector at the $\small\textbf{KEKB}$ asymmetric-energy $e^+ e^-$ collider. One of the $B$ mesons from the $\Upsilon(4S) \to B\bar{B}$ decay is fully reconstructed in a hadronic mode, while the recoiling side is analyzed for the signal decay. We find no evidence of a signal in any of the decay modes. Upper limits of the corresponding branching fractions are determined as ${\cal B}(B^+ \to e^+ \nu_e)<3.5\times 10^{-6}$ and ${\cal B}(B^+ \to \mu^+ \nu_\mu)<2.7 \times 10^{-6}$ at 90$\%$ confidence level.

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Search for B^+ to e^+ ν and B^+ to μ^+ ν decays using hadronic tagging

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