Observation of $\Upsilon(2S)\to\gamma \eta_{b}(1S)$ decay
High Energy Physics - Experiment
2018-12-12 v2
Abstract
We report the observation of decay based on analysis of the inclusive photon spectrum of fb of collisions at the center-of-mass energy collected with the Belle detector at the KEKB asymmetric-energy collider. We measure a branching fraction of , and derive an mass of MeV/, where the uncertainties are statistical and systematic, respectively. The significance of our measurement is greater than 7 standard deviations, constituting the first observation of this decay mode.
Cite
@article{arxiv.1807.01201,
title = {Observation of $\Upsilon(2S)\to\gamma \eta_{b}(1S)$ decay},
author = {Belle Collaboration and B. G. Fulsom and T. K. Pedlar and I. Adachi and H. Aihara and S. Al Said and D. M. Asner and H. Atmacan and V. Aulchenko and T. Aushev and R. Ayad and V. Babu and I. Badhrees and A. M. Bakich and V. Bansal and P. Behera and C. Beleño and M. Berger and V. Bhardwaj and B. Bhuyan and T. Bilka and J. Biswal and A. Bondar and G. Bonvicini and A. Bozek and M. Bračko and T. E. Browder and L. Cao and D. Červenkov and V. Chekelian and A. Chen and B. G. Cheon and K. Chilikin and K. Cho and S. -K. Choi and Y. Choi and S. Choudhury and D. Cinabro and S. Cunliffe and N. Dash and S. Di Carlo and J. Dingfelder and Z. Doležal and T. V. Dong and Z. Drásal and S. Eidelman and D. Epifanov and J. E. Fast and T. Ferber and R. Garg and V. Gaur and N. Gabyshev and A. Garmash and M. Gelb and A. Giri and P. Goldenzweig and E. Guido and J. Haba and K. Hayasaka and H. Hayashii and S. Hirose and W. -S. Hou and T. Iijima and K. Inami and G. Inguglia and A. Ishikawa and R. Itoh and M. Iwasaki and Y. Iwasaki and W. W. Jacobs and H. B. Jeon and S. Jia and Y. Jin and D. Joffe and K. K. Joo and T. Julius and T. Kawasaki and H. Kichimi and C. Kiesling and D. Y. Kim and H. J. Kim and J. B. Kim and K. T. Kim and S. H. Kim and K. Kinoshita and P. Kodyš and S. Korpar and D. Kotchetkov and P. Križan and R. Kroeger and P. Krokovny and T. Kuhr and R. Kulasiri and A. Kuzmin and Y. -J. Kwon and J. S. Lange and I. S. Lee and S. C. Lee and L. K. Li and Y. B. Li and L. Li Gioi and J. Libby and D. Liventsev and M. Lubej and T. Luo and M. Masuda and T. Matsuda and D. Matvienko and M. Merola and K. Miyabayashi and H. Miyata and R. Mizuk and G. B. Mohanty and H. K. Moon and T. Mori and R. Mussa and M. Nakao and T. Nanut and K. J. Nath and Z. Natkaniec and M. Nayak and M. Niiyama and N. K. Nisar and S. Nishida and S. Ogawa and S. Okuno and H. Ono and P. Pakhlov and G. Pakhlova and B. Pal and S. Pardi and H. Park and S. Paul and R. Pestotnik and L. E. Piilonen and V. Popov and E. Prencipe and A. Rabusov and M. Ritter and A. Rostomyan and G. Russo and Y. Sakai and M. Salehi and S. Sandilya and L. Santelj and T. Sanuki and V. Savinov and O. Schneider and G. Schnell and C. Schwanda and Y. Seino and K. Senyo and M. E. Sevior and V. Shebalin and C. P. Shen and T. -A. Shibata and J. -G. Shiu and B. Shwartz and F. Simon and J. B. Singh and A. Sokolov and E. Solovieva and M. Starič and J. F. Strube and M. Sumihama and K. Sumisawa and T. Sumiyoshi and W. Sutcliffe and M. Takizawa and U. Tamponi and K. Tanida and F. Tenchini and M. Uchida and T. Uglov and Y. Unno and S. Uno and P. Urquijo and S. E. Vahsen and C. Van Hulse and R. Van Tonder and G. Varner and A. Vinokurova and V. Vorobyev and A. Vossen and B. Wang and C. H. Wang and P. Wang and X. L. Wang and M. Watanabe and S. Watanuki and E. Widmann and E. Won and H. Ye and J. H. Yin and C. Z. Yuan and Z. P. Zhang and V. Zhukova and V. Zhulanov and A. Zupanc},
journal= {arXiv preprint arXiv:1807.01201},
year = {2018}
}