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arXiv · 1904.05713

Evidence for the decay $B^0\to p\bar{p}\pi^0$

Belle Collaboration·B. Pal·I. Adachi·K. Adamczyk·H. Aihara·D. M. Asner·H. Atmacan·V. Aulchenko·T. Aushev·R. Ayad·V. Babu·I. Badhrees·V. Bansal·P. Behera·C. Beleño·M. Berger·V. Bhardwaj·B. Bhuyan·T. Bilka·J. Biswal·A. Bobrov·A. Bozek·M. Bračko·T. E. Browder·M. Campajola·L. Cao·D. Červenkov·V. Chekelian·A. Chen·B. G. Cheon·K. Chilikin·K. Cho·S. -K. Choi·Y. Choi·D. Cinabro·S. Cunliffe·S. Di Carlo·Z. Doležal·T. V. Dong·D. Dossett·S. Eidelman·D. Epifanov·J. E. Fast·T. Ferber·B. G. Fulsom·R. Garg·V. Gaur·N. Gabyshev·A. Garmash·A. Giri·P. Goldenzweig·Y. Guan·J. Haba·T. Hara·K. Hayasaka·H. Hayashii·W. -S. Hou·C. -L. Hsu·T. Iijima·K. Inami·A. Ishikawa·R. Itoh·Y. Iwasaki·W. W. Jacobs·S. Jia·Y. Jin·D. Joffe·K. K. Joo·A. B. Kaliyar·G. Karyan·H. Kichimi·C. Kiesling·C. H. Kim·D. Y. Kim·K. T. Kim·S. H. Kim·K. Kinoshita·P. Kodyš·S. Korpar·D. Kotchetkov·P. Križan·R. Kroeger·P. Krokovny·R. Kulasiri·Y. -J. Kwon·J. Y. Lee·S. C. Lee·L. K. Li·Y. B. Li·L. Li Gioi·J. Libby·D. Liventsev·P. -C. Lu·T. Luo·J. MacNaughton·C. MacQueen·M. Masuda·T. Matsuda·D. Matvienko·M. Merola
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Abstract

We report a search for the charmless baryonic decay $B^0\to p\bar{p}\pi^0$ with a data sample corresponding to an integrated luminosity of 711~$\rm fb^{-1}$ containing $(772\pm 10)\times 10^6$ $B^0\bar{B}^0$ pairs. The data was collected by the Belle experiment running on the $\Upsilon(4S)$ resonance at the KEKB $e^+e^-$ collider. We measure a branching fraction $\mathcal{B}(B^0\to p\bar{p}\pi^0)= (5.0\pm1.8\pm0.6 )\times 10^{-7}$, where the first uncertainty is statistical and the second is systematic. The signal has a significance of 3.1 standard deviations and constitutes the first evidence for this decay mode. We also search for the intermediate two-body decays $B^{0}\to\Delta^+\bar{p}$ and $B^0\to\bar{\Delta}^-p$, and set an upper limit on the branching fraction: $\mathcal{B}(B^0\to \Delta^+\bar{p})+\mathcal{B}(B^0\to\bar{\Delta}^-p)<1.6\times10^{-6}$ at 90% confidence level.

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Belle Collaboration, B. Pal, I. Adachi, K. Adamczyk, H. Aihara, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, I. Badhrees, V. Bansal, P. Behera, C. Beleño, M. Berger, V. Bhardwaj, B. Bhuyan, T. Bilka, J. Biswal, A. Bobrov, A. Bozek, M. Bračko, T. E. Browder, M. Campajola, L. Cao, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S. -K. Choi, Y. Choi, D. Cinabro, S. Cunliffe, S. Di Carlo, Z. Doležal, T. V. Dong, D. Dossett, S. Eidelman, D. Epifanov, J. E. Fast, T. Ferber, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, A. Giri, P. Goldenzweig, Y. Guan, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, W. -S. Hou, C. -L. Hsu, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, Y. Iwasaki, W. W. Jacobs, S. Jia, Y. Jin, D. Joffe, K. K. Joo, A. B. Kaliyar, G. Karyan, H. Kichimi, C. Kiesling, C. H. Kim, D. Y. Kim, K. T. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, R. Kulasiri, Y. -J. Kwon, J. Y. Lee, S. C. Lee, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, D. Liventsev, P. -C. Lu, T. Luo, J. MacNaughton, C. MacQueen, M. Masuda, T. Matsuda, D. Matvienko, M. Merola. 2019-04-11. Evidence for the decay $B^0\to p\bar{p}\pi^0$. https://doi.org/10.1103/physrevd.99.091104

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