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arxiv: 1504.00957 · v3 · submitted 2015-04-03 · ✦ hep-ex

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Evidence for the decay B0->eta pi⁰

Belle Collaboration: B. Pal , A. J. Schwartz , A. Abdesselam , I. Adachi , H. Aihara , S. Al Said , K. Arinstein , D. M. Asner
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V. Aulchenko T. Aushev R. Ayad V. Babu I. Badhrees A. M. Bakich A. Bobrov G. Bonvicini A. Bozek M. Bra\v{c}ko T. E. Browder D. \v{C}ervenkov M.-C. Chang V. Chekelian A. Chen B. G. Cheon K. Cho V. Chobanova Y. Choi D. Cinabro J. Dalseno Z. Dole\v{z}al Z. Dr\'asal A. Drutskoy D. Dutta S. Eidelman H. Farhat J. E. Fast T. Ferber O. Frost B. G. Fulsom V. Gaur N. Gabyshev S. Ganguly A . Garmash D. Getzkow R. Gillard R. Glattauer Y. M. Goh B. Golob O. Grzymkowska T. Hara K. Hayasaka H. Hayashii X. H. He W.-S. Hou M. Huschle H. J. Hyun T. Iijima A. Ishikawa R. Itoh Y. Iwasaki I. Jaegle T. Julius K. H. Kang E. Kato 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 B. R. Ko P. Kody\v{s} S. Korpar P. Kri\v{z}an P. Krokovny T. Kuhr T. Kumita A. Kuzmin Y.-J. Kwon J. S. Lange D. H. Lee I. S. Lee Y. Li L. Li Gioi J. Libby D. Liventsev P. Lukin D. Matvienko H. Miyata G. B. Mohanty A. Moll H. K. Moon K. R. Nakamura E. Nakano M. Nakao T. Nanut Z. Natkaniec M. Nayak S. Nishida S. Ogawa S. Okuno P. Pakhlov G. Pakhlova C. W. Park H. Park T. K. Pedlar L. Pes\'antez M. Petri\v{c} L. E. Piilonen C. Pulvermacher E. Ribe\v{z}l M. Ritter A. Rostomyan S. Ryu Y. Sakai S. Sandilya D. Santel L. Santelj T. Sanuki Y. Sato O. Schneider G. Schnell C. Schwanda K. Senyo O. S eon M. E. Sevior M. Shapkin V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu A. Sibidanov F. Simon Y.-S. Sohn E. Solovieva S. Stani\v{c} M. Stari\v{c} M. Su mihama K. Sumisawa T. Sumiyoshi U. Tamponi Y. Teramoto F. Thorne M. Uchida S. Uehara Y. Unno S. Uno Y. Usov C. Van Hulse P. Vanhoefer G. Varner A. Vinokur ova V. Vorobyev A. Vossen M. N. Wagner C. H. Wang M.-Z. Wang P. Wang X. L. Wang Y. Watanabe E. Won H. Yamamoto J. Yamaoka S. Yashchenko Z. P. Zhang V. Zhi lich V. Zhulanov A. Zupanc
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classification ✦ hep-ex
keywords decaydataevidencefirstmathcaltimesbellebranching
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We report a search for the charmless hadronic decay $B^0\to\eta \pi^0$ with a data sample corresponding to an integrated luminosity of 694 $\rm fb^{-1}$ containing $753\times10^6$ $B\bar{B}$ pairs. The data were collected by the Belle experiment running on the $\Upsilon(4S)$ resonance at the KEKB $e^+e^-$ collider. We measure a branching fraction $\mathcal{B}(B^0\to\eta\pi^0)=(4.1^{+1.7+0.5}_{-1.5-0.7})\times 10^{-7}$, where the first uncertainty is statistical and the second is systematic. Our measurement gives an upper limit of $\mathcal{B}(B^0\to\eta\pi^0)<6.5\times 10^{-7}$ at 90\% confidence level. The signal has a significance of $3.0$ standard deviations and constitutes the first evidence for this decay mode.

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