First observation of the hadronic transition Υ(4S)→ηhb(1P) and new measurement of the hb(1P) and ηb(1S) parameters

First observation of the hadronic transition Υ(4S)→ηhb(1P) and new measurement of the hb(1P) and ηb(1S) parameters

Using a sample of 771.6 × 106 Υ(4S) decays collected by the Belle experiment at the KEKB e +e - collider, we observe for the first time the transition Υ(4S) → ηhb(1P) with the branching fraction B[Υ(4S) → ηhb(1P)] = (2.18 ± 0.11 ± 0.18) × 10-3 and we measure the hb(1P) mass Mhb(1P ) = (9899.3 ± 0.4...

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Veröffentlicht in:Physical review letters 2015-09, Vol.115 (4)
Hauptverfasser: Tamponi, Umberto, Abdesselam, A., Atmacan, H., Aushev, T., Ayad, R., Barberio, E., Bhardwaj, V., Biswal, J., Bondar, A., Bonvicini, Giovanni, Bracko, Marko, Browder, Thomas E., Cervenkov, D., Chen, A., Cheon, B. G., Choi, S-K., Choi, Y., Dolezal, Z., Drasal, Z., Epifanov, D., Farhat, H., Fast, James E., Ferber, T., Fulsom, Bryan G., Gabyshev, N., Garmash, Alexey, Gillard, R., Golob, B., Hayasaka, K., Hayashii, H., He, X. H., Hedges, Michael T., Hou, W. S., Inami, K., Ishikawa, Akimasa, Jaegle, Igal, Joffe, D., Julius, T., Kato, E., Katrenko, P., Kichimi, H., Kim, D. Y., Kim, H. J., Kim, J. H., Kodys, P., Krokovny, Pavel, Lange, J. S., Lewis, P., Libby, J., Miyabayashi, K., Miyata, H., Mizuk, R., Mohanty, G. B., Moll, A., Nakao, Mikihiko, Nanut, T., Natkaniec, Z., Nishida, Shohei, Ogawa, S., Okuno, S., Olsen, Stephen L., Oswald, Christian, Pakhlova, Galina, Park, H., Pesantez, L., Pestotnik, Rok, Petric, Marko, Piilonen, Leo E., Ritter, M., Ryu, S., Sakai, Y., Sandilya, Saurabh, Santelj, Luka, Sanuki, T., Savinov, Vladimir, Schneider, O., Schnell, G., Schwanda, C., Senyo, K., Sevior, ME, Shapkin, M., Shebalin, V., Shen, C. P., Shibata, TA, Shwartz, B., Sokolov, Anatoly, Stypula, J., Tanida, K., Uchida, M., Unno, Yuji, Van Hulse, C., Varner, Gary, Vinokurova, A., Wang, M. Z., Watanabe, Y., Won, Eun Il, Yamaoka, Jared AK, Yashchenko, S., Zhang, Z. P., Zhulanov, V.
Format: Artikel
Sprache:eng
Schlagworte:
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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Zusammenfassung:Using a sample of 771.6 × 106 Υ(4S) decays collected by the Belle experiment at the KEKB e +e - collider, we observe for the first time the transition Υ(4S) → ηhb(1P) with the branching fraction B[Υ(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/c 2 , corresponding to the hyperfine splitting ΔMHF (1P) = (0.6 ± 0.4 ± 1.0) MeV/c 2 . Using the transition hb(1P) → γηb(1S), we measure the ηb(1S) mass Mηb(1S) = (9400.7 ± 1.7 ± 1.6) MeV/c 2 , corresponding to ΔMHF (1S) = (59.6 ± 1.7 ± 1.6) MeV/c 2 , the ηb(1S) width Γηb(1S) = (8+6 -5 ± 5) MeV/c 2 and the branching fraction B[hb(1P) → γηb(1S)] = (56 ± 8 ± 4)%.
ISSN:0031-9007
1079-7114