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; 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

arXiv:1308.2646·hep-ex·June 16, 2015

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, 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

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TL;DR

This paper reports the first observation of the neutral Zb0(10610) state in Y(5S) decays to Y(nS) pi0 pi0, using a Dalitz analysis with data from the Belle detector, confirming its existence with high significance.

Contribution

The study provides the first evidence of Zb0(10610) in neutral decay channels, expanding the understanding of bottomonium-like states.

Findings

01

First observation of Zb0(10610) with 6.5 sigma significance.

02

Evidence of Zb0(10610) decaying to Y(2,3S) pi0.

03

Analysis based on 121.4 fb^-1 data sample.

Abstract

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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