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First Observation of the Zb0(10610) in a Dalitz Analysis of Y(5S) -> Y(nS) pi0 pi0

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arxiv 1308.2646 v2 pith:YEK5BA5C submitted 2013-08-12 hep-ex

First Observation of the Zb0(10610) in a Dalitz Analysis of Y(5S) -> Y(nS) pi0 pi0

P. Krokovny , A. Bondar , I. Adachi , H. Aihara , K. Arinstein , D. M. Asner , V. Aulchenko , T. Aushev
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T. Aziz A. M. Bakich A. Bala A. Bay V. Bhardwaj B. Bhuyan G. Bonvicini C. Bookwalter A. Bozek M. Brachko T. E. Browder A. Chen P. Chen B. G. Cheon K. Chilikin R. Chistov I.-S. Cho K. Cho V. Chobanova S.-K. Choi Y. Choi D. Cinabro J. Dalseno J. Dingfelder Z. Dolezhal Z. Drasal A. Drutskoy D. Dutta S. Eidelman D. Epifanov H. Farhat J. E. Fast M. Feindt T. Ferber A. Frey V. Gaur N. Gabyshev S. Ganguly A. Garmash R. Gillard Y. M. Goh B. Golob J. Haba T. Hara H. Hayashii Y. Hoshi W.-S. Hou Y. B. Hsiung H. J. Hyun T. Iijima A. Ishikawa R. Itoh Y. Iwasaki T. Julius D. H. Kah J. H. Kang E. Kato H. Kawai T. Kawasaki C. Kiesling D. Y. Kim H. O. Kim J. B. Kim J. H. Kim Y. J. Kim K. Kinoshita J. Klucar B. R. Ko P. Kodysh S. Korpar T. Kuhr T. Kumita A. Kuzmin J. S. Lange S.-H. Lee J. Li Y. Li J. Libby Y. Liu Z. Q. Liu D. Liventsev P. Lukin D. Matvienko K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty A. Moll N. Muramatsu R. Mussa Y. Nagasaka M. Nakao M. Nayak E. Nedelkovska C. Ng N. K. Nisar S. Nishida O. Nitoh S. Ogawa C. Oswald G. Pakhlova C. W. Park H. Park H. K. Park T. K. Pedlar R. Pestotnik M. Petrich L. E. Piilonen A. Poluektov M. Ritter M. Roehrken A. Rostomyan S. Ryu H. Sahoo T. Saito K. Sakai Y. Sakai S. Sandilya L. Santelj T. Sanuki Y. Sato V. Savinov O. Schneider G. Schnell C. Schwanda D. Semmler K. Senyo O. Seon M. E. Sevior M. Shapkin V. Shebalin T.-A. Shibata J.-G. Shiu B. Shwartz A. Sibidanov F. Simon Y.-S. Sohn A. Sokolov E. Solovieva S. Stanich M. Starich M. Steder T. Sumiyoshi U. Tamponi K. Tanida G. Tatishvili Y. Teramoto K. Trabelsi T. Tsuboyama M. Uchida S. Uehara T. Uglov Y. Unno S. Uno P. Urquijo S. E. Vahsen C. Van Hulse P. Vanhoefer G. Varner V. Vorobyev M. N. Wagner C. H. Wang M.-Z. Wang P. Wang X. L. Wang Y. Watanabe K. M. Williams E. Won Y. Yamashita S. Yashchenko Y. Yook C. Z. Yuan Y. Yusa C. C. Zhang Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc
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keywords firstanalysisdalitzdecaysobservationasymmetric-energybellecollected
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We report the first observation of Y(5S) -> Y(nS) pi0 pi0 decays. The neutral partner of the Zb+-(10610), the Zb0(10610) decaying to Y(2,3S) pi0, is observed for the first time with a 6.5 sigma significance using a Dalitz analysis of Y(5S) -> Y(2,3S) pi0 pi0 decays. The results are obtained with a 121.4 fb^-1 data sample collected with the Belle detector at the Y(5S) resonance at the KEKB asymmetric-energy e+e- collider.

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