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arxiv: 1509.06521 · v2 · submitted 2015-09-22 · ✦ hep-ex

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Search for B⁰ to π^- τ^+ ν_τ with hadronic tagging at Belle

Belle Collaboration: P. Hamer , A. Frey , A. Abdesselam , I. Adachi , H. Aihara , S. Al Said , K. Arinstein , D. M. Asner
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T. Aushev R. Ayad V. Babu I. Badhrees A. M. Bakich E. Barberio B. Bhuyan J. Biswal A. Bozek M. Bra\v{c}ko T. E. Browder D. \v{C}ervenkov V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho V. Chobanova Y. Choi D. Cinabro J. Dalseno M. Danilov I. Danko N. Dash J. Dingfelder Z. Dole\v{z}al Z. Dr\'asal A. Drutskoy D. Dutta S. Eidelman H. Farhat J. E. Fast T. Ferber B. G. Fulsom V. Gaur N. Gabyshev A. Garmash D. Getzkow R. Gillard R. Glattauer Y. M. Goh P. Goldenzweig B. Golob D. Greenwald J. Haba T. Hara J. Hasenbusch K. Hayasaka H. Hayashii W.-S. Hou T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh Y. Iwasaki I. Jaegle H. B. Jeon D. Joffe K. K. Joo T. Julius K. H. Kang E. Kato T. Kawasaki C. Kiesling D. Y. Kim J. B. Kim J. H. Kim K. T. Kim M. J. Kim S. H. Kim Y. J. Kim K. Kinoshita P. Kody\v{s} S. Korpar P. Kri\v{z}an P. Krokovny T. Kuhr A. Kuzmin Y.-J. Kwon J. S. Lange D. H. Lee I. S. Lee H. Li L. Li Y. Li J. Libby Y. Liu D. Liventsev P. Lukin M. Masuda D. Matvienko K. Miyabayashi H. Miyake H. Miyata R. Mizuk G. B. Mohanty S. Mohanty A. Moll H. K. Moon R. Mussa E. Nakano M. Nakao T. Nanut Z. Natkaniec M. Nayak N. K. Nisar S. Nishida S. Ogawa S. Okuno C. Oswald P. Pakhlov G. Pakhlova B. Pal H. Park T. K. Pedlar L. Pes\'antez R. Pestotnik M. Petri\v{c} L. E. Piilonen C. Pulvermacher J. Rauch E. Ribe\v{z}l M. Ritter A. Rostomyan H. Sahoo Y. Sakai S. Sandilya L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell C. Schwanda Y. Seino K. Senyo M. Shapkin V. Shebalin T.-A. Shibata J.-G. Shiu A. Sibidanov F. Simon Y.-S. Sohn A. Sokolov E. Solovieva M. Stari\v{c} J. Stypula T. Sumiyoshi Y. Teramoto K. Trabelsi V. Trusov M. Uchida S. Uehara Y. Unno S. Uno P. Urquijo Y. Usov C. Van Hulse P. Vanhoefer G. Varner V. Vorobyev A. Vossen C. H. Wang M.-Z. Wang P. Wang Y. Watanabe E. Won H. Yamamoto J. Yamaoka S. Yashchenko Y. Yook Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc
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classification ✦ hep-ex
keywords bellesearchhadronicprocesstimesasymmetric-energycollectedcollider
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We search for the process $B^0 \to \pi^- \tau^+ \nu_\tau$ using the full Belle data set of $711\,{\rm fb}^{-1}$, corresponding to $772 \times 10^6 B\bar{B}$ pairs, collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We reconstruct one $B$ meson in a hadronic decay and search for the $B^0 \to \pi^- \tau^+ \nu_\tau$ process in the remainder of the event. No significant signal is observed and an upper limit of $\mathcal{B}(B^0 \to \pi^- \tau^+ \nu_\tau) < 2.5 \times 10^{-4}$ is obtained at the $90\%$ confidence level.

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