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First Observation of the Hadronic Transitionϒ ( 4 S ) → ηhb( 1 P )and New Measurement of theh b( 1 P )andη b( 1 S )Parameters

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posted on 2024-08-06, 09:38 authored by U. Tamponi, R. Mussa, A. Abdesselam, H. Aihara, K. Arinstein, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, I. Badhrees, A. M. Bakich, E. Barberio, V. Bhardwaj, B. Bhuyan, J. Biswal, A. Bondar, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, A. Chen, B. G. Cheon, K. Cho, V. Chobanova, S.-K. Choi, Y. Choi, D. Cinabro, M. Danilov, Z. Doležal, Z. Drásal, A. Drutskoy, S. Eidelman, D. Epifanov, H. Farhat, J. E. Fast, T. Ferber, B. G. Fulsom, V. Gaur, N. Gabyshev, A. Garmash, D. Getzkow, R. Gillard, Y. M. Goh, B. Golob, J. Haba, K. Hayasaka, H. Hayashii, X. H. He, M. T. Hedges, W.-S. Hou, T. Iijima, K. Inami, A. Ishikawa, I. Jaegle, D. Joffe, T'Mir Julius, E. Kato, P. Katrenko, H. Kichimi, C. Kiesling, D. Y. Kim, H. J. Kim, J. H. Kim, K. T. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, T. Kumita, A. Kuzmin, J. S. Lange, P. Lewis, J. Libby, P. Lukin, D. Matvienko, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, T. Mori, E. Nakano, M. Nakao, T. Nanut, Z. Natkaniec, M. Nayak, N. K. Nisar, S. Nishida, S. Ogawa, S. Okuno, S. L. Olsen, W. Ostrowicz, C. Oswald, G. Pakhlova, B. Pal, H. Park, T. K. Pedlar, L. Pesántez, R. Pestotnik, M. Petrič, L. E. Piilonen, E. Ribežl, M. Ritter, A. Rostomyan, S. Ryu, Y. Sakai, S. Sandilya, L. Santelj, T. Sanuki, Y. Sato, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, D. Semmler, K. Senyo, M. E. Sevior, M. Shapkin, V. Shebalin, C. P. Shen, T.-A. Shibata, J.-G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, Y.-S. Sohn, A. Sokolov, M. Starič, M. Steder, J. Stypula, K. Tanida, Y. Teramoto, K. Trabelsi, M. Uchida, T. Uglov, Y. Unno, S. Uno, P. Urquijo, C. Van Hulse, P. Vanhoefer, G. Varner, A. Vinokurova, A. Vossen, M. N. Wagner, M.-Z. Wang, X. L. Wang, Y. Watanabe, K. M. Williams, E. Won, J. Yamaoka, S. Yashchenko, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc
Using a sample of 771.6×106 ΓΓ(4S) decays collected by the Belle experiment at the KEKB e+e- collider, we observe, for the first time, the transition Γ(4S)→ηhb(1P) with the branching fraction B[Γ(4S)→ηhb(1P)]=(2.18±0.11±0.18)×10-3 and we measure the hb(1P) mass Mhb(1P)=(9899.3±0.4±1.0)MeV/c2, corresponding to the hyperfine (HF) splitting ΔMHF(1P)=(0.6±0.4±1.0)MeV/c2. Using the transition hb(1P)→γηb(1S), we measure the ηb(1S) mass Mηb(1S)=(9400.7±1.7±1.6)MeV/c2, corresponding to ΔMHF(1S)=(59.6±1.7±1.6)MeV/c2, the ηb(1S) width Γηb(1S)=(8-5+6±5)MeV/c2 and the branching fraction B[hb(1P)→γηb(1S)]=(56±8±4)%.

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ISSN

0031-9007

Journal title

Physical Review Letters

Volume

115

Issue

14

Article number

article no. 142001

Pagination

6 pp

Publisher

American Physical Society

Copyright statement

Copyright © 2015 American Physical Society. The published version is reproduced in accordance with the copyright policy of the publisher.

Language

eng

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