First Observation of the Hadronic Transition Γ (4S) →ηhb (1P) and New Measurement of the hb (1P) and ηb (1S) Parameters

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. BrowderD. 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. 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, Eunil Won, J. Yamaoka, S. Yashchenko, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

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)%.

Original languageEnglish
Article number142001
JournalPhysical Review Letters
Volume115
Issue number14
DOIs
Publication statusPublished - 2015 Sep 29

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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First Observation of the Hadronic Transition Γ (4S) →ηhb (1P) and New Measurement of the hb (1P) and ηb (1S) Parameters. / Tamponi, U.; Mussa, R.; Abdesselam, A.; Aihara, H.; Arinstein, K.; Asner, D. M.; Atmacan, H.; Aushev, T.; Ayad, R.; Badhrees, I.; Bakich, A. M.; Barberio, E.; Bhardwaj, V.; Bhuyan, B.; Biswal, J.; Bondar, A.; Bonvicini, G.; Bozek, A.; Bračko, M.; Browder, T. E.; Červenkov, D.; Chen, A.; Cheon, B. G.; Cho, K.; Chobanova, V.; Choi, S. K.; Choi, Y.; Cinabro, D.; Danilov, M.; DoleŽal, Z.; Drásal, Z.; Drutskoy, A.; Eidelman, S.; Epifanov, D.; Farhat, H.; Fast, J. E.; Ferber, T.; Fulsom, B. G.; Gaur, V.; Gabyshev, N.; Garmash, A.; Getzkow, D.; Gillard, R.; Goh, Y. M.; Golob, B.; Haba, J.; Hayasaka, K.; Hayashii, H.; He, X. H.; Hedges, M. T.; Hou, W. S.; Iijima, T.; Inami, K.; Ishikawa, A.; Jaegle, I.; Joffe, D.; Julius, T.; Kato, E.; Katrenko, P.; Kichimi, H.; Kiesling, C.; Kim, D. Y.; Kim, H. J.; Kim, J. H.; Kim, K. T.; Kim, S. H.; Kinoshita, K.; Kodyš, P.; Korpar, S.; KriŽan, P.; Krokovny, P.; Kumita, T.; Kuzmin, A.; Lange, J. S.; Lewis, P.; Libby, J.; Lukin, P.; Matvienko, D.; Miyabayashi, K.; Miyata, H.; Mizuk, R.; Mohanty, G. B.; Moll, A.; Mori, T.; Nakano, E.; Nakao, M.; Nanut, T.; Natkaniec, Z.; Nayak, M.; Nisar, N. K.; Nishida, S.; Ogawa, S.; Okuno, S.; Olsen, S. L.; Ostrowicz, W.; Oswald, C.; Pakhlova, G.; Pal, B.; Park, H.; Pedlar, T. K.; Pesántez, L.; Pestotnik, R.; Petrič, M.; Piilonen, L. E.; RibeŽl, E.; Ritter, M.; Rostomyan, A.; Ryu, S.; Sakai, Y.; Sandilya, S.; Santelj, L.; Sanuki, T.; Sato, Y.; Savinov, V.; Schneider, O.; Schnell, G.; Schwanda, C.; Semmler, D.; Senyo, K.; Sevior, M. E.; Shapkin, M.; Shebalin, V.; Shen, C. P.; Shibata, T. A.; Shiu, J. G.; Shwartz, B.; Sibidanov, A.; Simon, F.; Sohn, Y. S.; Sokolov, A.; Starič, M.; Steder, M.; Stypula, J.; Tanida, K.; Teramoto, Y.; Trabelsi, K.; Uchida, M.; Uglov, T.; Unno, Y.; Uno, S.; Urquijo, P.; Van Hulse, C.; Vanhoefer, P.; Varner, G.; Vinokurova, A.; Vossen, A.; Wagner, M. N.; Wang, M. Z.; Wang, X. L.; Watanabe, Y.; Williams, K. M.; Won, Eunil; Yamaoka, J.; Yashchenko, S.; Zhang, Z. P.; Zhilich, V.; Zhulanov, V.; Zupanc, A.

In: Physical Review Letters, Vol. 115, No. 14, 142001, 29.09.2015.

Research output: Contribution to journalArticle

Tamponi, U, Mussa, R, Abdesselam, A, Aihara, H, Arinstein, K, Asner, DM, Atmacan, H, Aushev, T, Ayad, R, Badhrees, I, Bakich, AM, Barberio, E, Bhardwaj, V, Bhuyan, B, Biswal, J, Bondar, A, Bonvicini, G, Bozek, A, Bračko, M, Browder, TE, Červenkov, D, Chen, A, Cheon, BG, Cho, K, Chobanova, V, Choi, SK, Choi, Y, Cinabro, D, Danilov, M, DoleŽal, Z, Drásal, Z, Drutskoy, A, Eidelman, S, Epifanov, D, Farhat, H, Fast, JE, Ferber, T, Fulsom, BG, Gaur, V, Gabyshev, N, Garmash, A, Getzkow, D, Gillard, R, Goh, YM, Golob, B, Haba, J, Hayasaka, K, Hayashii, H, He, XH, Hedges, MT, Hou, WS, Iijima, T, Inami, K, Ishikawa, A, Jaegle, I, Joffe, D, Julius, T, Kato, E, Katrenko, P, Kichimi, H, Kiesling, C, Kim, DY, Kim, HJ, Kim, JH, Kim, KT, Kim, SH, Kinoshita, K, Kodyš, P, Korpar, S, KriŽan, P, Krokovny, P, Kumita, T, Kuzmin, A, Lange, JS, Lewis, P, Libby, J, Lukin, P, Matvienko, D, Miyabayashi, K, Miyata, H, Mizuk, R, Mohanty, GB, Moll, A, Mori, T, Nakano, E, Nakao, M, Nanut, T, Natkaniec, Z, Nayak, M, Nisar, NK, Nishida, S, Ogawa, S, Okuno, S, Olsen, SL, Ostrowicz, W, Oswald, C, Pakhlova, G, Pal, B, Park, H, Pedlar, TK, Pesántez, L, Pestotnik, R, Petrič, M, Piilonen, LE, RibeŽl, E, Ritter, M, Rostomyan, A, Ryu, S, Sakai, Y, Sandilya, S, Santelj, L, Sanuki, T, Sato, Y, Savinov, V, Schneider, O, Schnell, G, Schwanda, C, Semmler, D, Senyo, K, Sevior, ME, Shapkin, M, Shebalin, V, Shen, CP, Shibata, TA, Shiu, JG, Shwartz, B, Sibidanov, A, Simon, F, Sohn, YS, Sokolov, A, Starič, M, Steder, M, Stypula, J, Tanida, K, Teramoto, Y, Trabelsi, K, Uchida, M, Uglov, T, Unno, Y, Uno, S, Urquijo, P, Van Hulse, C, Vanhoefer, P, Varner, G, Vinokurova, A, Vossen, A, Wagner, MN, Wang, MZ, Wang, XL, Watanabe, Y, Williams, KM, Won, E, Yamaoka, J, Yashchenko, S, Zhang, ZP, Zhilich, V, Zhulanov, V & Zupanc, A 2015, 'First Observation of the Hadronic Transition Γ (4S) →ηhb (1P) and New Measurement of the hb (1P) and ηb (1S) Parameters', Physical Review Letters, vol. 115, no. 14, 142001. https://doi.org/10.1103/PhysRevLett.115.142001
Tamponi, U. ; Mussa, R. ; Abdesselam, A. ; Aihara, H. ; Arinstein, K. ; Asner, D. M. ; Atmacan, H. ; Aushev, T. ; Ayad, R. ; Badhrees, I. ; Bakich, A. M. ; Barberio, E. ; Bhardwaj, V. ; Bhuyan, B. ; Biswal, J. ; Bondar, A. ; Bonvicini, G. ; Bozek, A. ; Bračko, M. ; Browder, T. E. ; Červenkov, D. ; Chen, A. ; Cheon, B. G. ; Cho, K. ; Chobanova, V. ; Choi, S. K. ; Choi, Y. ; Cinabro, D. ; Danilov, M. ; DoleŽal, Z. ; Drásal, Z. ; Drutskoy, A. ; Eidelman, S. ; Epifanov, D. ; Farhat, H. ; Fast, J. E. ; Ferber, T. ; Fulsom, B. G. ; Gaur, V. ; Gabyshev, N. ; Garmash, A. ; Getzkow, D. ; Gillard, R. ; Goh, Y. M. ; Golob, B. ; Haba, J. ; Hayasaka, K. ; Hayashii, H. ; He, X. H. ; Hedges, M. T. ; Hou, W. S. ; Iijima, T. ; Inami, K. ; Ishikawa, A. ; Jaegle, I. ; Joffe, D. ; Julius, T. ; Kato, E. ; Katrenko, P. ; Kichimi, H. ; Kiesling, C. ; Kim, D. Y. ; Kim, H. J. ; Kim, J. H. ; Kim, K. T. ; Kim, S. H. ; Kinoshita, K. ; Kodyš, P. ; Korpar, S. ; KriŽan, P. ; Krokovny, P. ; Kumita, T. ; Kuzmin, A. ; Lange, J. S. ; Lewis, P. ; Libby, J. ; Lukin, P. ; Matvienko, D. ; Miyabayashi, K. ; Miyata, H. ; Mizuk, R. ; Mohanty, G. B. ; Moll, A. ; Mori, T. ; Nakano, E. ; Nakao, M. ; Nanut, T. ; Natkaniec, Z. ; Nayak, M. ; Nisar, N. K. ; Nishida, S. ; Ogawa, S. ; Okuno, S. ; Olsen, S. L. ; Ostrowicz, W. ; Oswald, C. ; Pakhlova, G. ; Pal, B. ; Park, H. ; Pedlar, T. K. ; Pesántez, L. ; Pestotnik, R. ; Petrič, M. ; Piilonen, L. E. ; RibeŽl, E. ; Ritter, M. ; Rostomyan, A. ; Ryu, S. ; Sakai, Y. ; Sandilya, S. ; Santelj, L. ; Sanuki, T. ; Sato, Y. ; Savinov, V. ; Schneider, O. ; Schnell, G. ; Schwanda, C. ; Semmler, D. ; Senyo, K. ; Sevior, M. E. ; Shapkin, M. ; Shebalin, V. ; Shen, C. P. ; Shibata, T. A. ; Shiu, J. G. ; Shwartz, B. ; Sibidanov, A. ; Simon, F. ; Sohn, Y. S. ; Sokolov, A. ; Starič, M. ; Steder, M. ; Stypula, J. ; Tanida, K. ; Teramoto, Y. ; Trabelsi, K. ; Uchida, M. ; Uglov, T. ; Unno, Y. ; Uno, S. ; Urquijo, P. ; Van Hulse, C. ; Vanhoefer, P. ; Varner, G. ; Vinokurova, A. ; Vossen, A. ; Wagner, M. N. ; Wang, M. Z. ; Wang, X. L. ; Watanabe, Y. ; Williams, K. M. ; Won, Eunil ; Yamaoka, J. ; Yashchenko, S. ; Zhang, Z. P. ; Zhilich, V. ; Zhulanov, V. ; Zupanc, A. / First Observation of the Hadronic Transition Γ (4S) →ηhb (1P) and New Measurement of the hb (1P) and ηb (1S) Parameters. In: Physical Review Letters. 2015 ; Vol. 115, No. 14.
@article{54630f5c80de4b69a2229250c5ef7436,
title = "First Observation of the Hadronic Transition Γ (4S) →ηhb (1P) and New Measurement of the hb (1P) and ηb (1S) Parameters",
abstract = "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){\%}.",
author = "U. Tamponi and R. Mussa and A. Abdesselam and H. Aihara and K. Arinstein and Asner, {D. M.} and H. Atmacan and T. Aushev and R. Ayad and I. Badhrees and Bakich, {A. M.} and E. Barberio and V. Bhardwaj and B. Bhuyan and J. Biswal and A. Bondar and G. Bonvicini and A. Bozek and M. Bračko and Browder, {T. E.} and D. Červenkov and A. Chen and Cheon, {B. G.} and K. Cho and V. Chobanova and Choi, {S. K.} and Y. Choi and D. Cinabro and M. Danilov and Z. DoleŽal and Z. Dr{\'a}sal and A. Drutskoy and S. Eidelman and D. Epifanov and H. Farhat and Fast, {J. E.} and T. Ferber and Fulsom, {B. G.} and V. Gaur and N. Gabyshev and A. Garmash and D. Getzkow and R. Gillard and Goh, {Y. M.} and B. Golob and J. Haba and K. Hayasaka and H. Hayashii and He, {X. H.} and Hedges, {M. T.} and Hou, {W. S.} and T. Iijima and K. Inami and A. Ishikawa and I. Jaegle and D. Joffe and T. Julius and E. Kato and P. Katrenko and H. Kichimi and C. Kiesling and Kim, {D. Y.} and Kim, {H. J.} and Kim, {J. H.} and Kim, {K. T.} and Kim, {S. H.} and K. Kinoshita and P. Kodyš and S. Korpar and P. KriŽan and P. Krokovny and T. Kumita and A. Kuzmin and Lange, {J. S.} and P. Lewis and J. Libby and P. Lukin and D. Matvienko and K. Miyabayashi and H. Miyata and R. Mizuk and Mohanty, {G. B.} and A. Moll and T. Mori and E. Nakano and M. Nakao and T. Nanut and Z. Natkaniec and M. Nayak and Nisar, {N. K.} and S. Nishida and S. Ogawa and S. Okuno and Olsen, {S. L.} and W. Ostrowicz and C. Oswald and G. Pakhlova and B. Pal and H. Park and Pedlar, {T. K.} and L. Pes{\'a}ntez and R. Pestotnik and M. Petrič and Piilonen, {L. E.} and E. RibeŽl and M. Ritter and A. Rostomyan and S. Ryu and Y. Sakai and S. Sandilya and L. Santelj and T. Sanuki and Y. Sato and V. Savinov and O. Schneider and G. Schnell and C. Schwanda and D. Semmler and K. Senyo and Sevior, {M. E.} and M. Shapkin and V. Shebalin and Shen, {C. P.} and Shibata, {T. A.} and Shiu, {J. G.} and B. Shwartz and A. Sibidanov and F. Simon and Sohn, {Y. S.} and A. Sokolov and M. Starič and M. Steder and J. Stypula and K. Tanida and Y. Teramoto and K. Trabelsi and M. Uchida and T. Uglov and Y. Unno and S. Uno and P. Urquijo and {Van Hulse}, C. and P. Vanhoefer and G. Varner and A. Vinokurova and A. Vossen and Wagner, {M. N.} and Wang, {M. Z.} and Wang, {X. L.} and Y. Watanabe and Williams, {K. M.} and Eunil Won and J. Yamaoka and S. Yashchenko and Zhang, {Z. P.} and V. Zhilich and V. Zhulanov and A. Zupanc",
year = "2015",
month = "9",
day = "29",
doi = "10.1103/PhysRevLett.115.142001",
language = "English",
volume = "115",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "14",

}

TY - JOUR

T1 - First Observation of the Hadronic Transition Γ (4S) →ηhb (1P) and New Measurement of the hb (1P) and ηb (1S) Parameters

AU - Tamponi, U.

AU - Mussa, R.

AU - Abdesselam, A.

AU - Aihara, H.

AU - Arinstein, K.

AU - Asner, D. M.

AU - Atmacan, H.

AU - Aushev, T.

AU - Ayad, R.

AU - Badhrees, I.

AU - Bakich, A. M.

AU - Barberio, E.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Biswal, J.

AU - Bondar, A.

AU - Bonvicini, G.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Červenkov, D.

AU - Chen, A.

AU - Cheon, B. G.

AU - Cho, K.

AU - Chobanova, V.

AU - Choi, S. K.

AU - Choi, Y.

AU - Cinabro, D.

AU - Danilov, M.

AU - DoleŽal, Z.

AU - Drásal, Z.

AU - Drutskoy, A.

AU - Eidelman, S.

AU - Epifanov, D.

AU - Farhat, H.

AU - Fast, J. E.

AU - Ferber, T.

AU - Fulsom, B. G.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Getzkow, D.

AU - Gillard, R.

AU - Goh, Y. M.

AU - Golob, B.

AU - Haba, J.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - He, X. H.

AU - Hedges, M. T.

AU - Hou, W. S.

AU - Iijima, T.

AU - Inami, K.

AU - Ishikawa, A.

AU - Jaegle, I.

AU - Joffe, D.

AU - Julius, T.

AU - Kato, E.

AU - Katrenko, P.

AU - Kichimi, H.

AU - Kiesling, C.

AU - Kim, D. Y.

AU - Kim, H. J.

AU - Kim, J. H.

AU - Kim, K. T.

AU - Kim, S. H.

AU - Kinoshita, K.

AU - Kodyš, P.

AU - Korpar, S.

AU - KriŽan, P.

AU - Krokovny, P.

AU - Kumita, T.

AU - Kuzmin, A.

AU - Lange, J. S.

AU - Lewis, P.

AU - Libby, J.

AU - Lukin, P.

AU - Matvienko, D.

AU - Miyabayashi, K.

AU - Miyata, H.

AU - Mizuk, R.

AU - Mohanty, G. B.

AU - Moll, A.

AU - Mori, T.

AU - Nakano, E.

AU - Nakao, M.

AU - Nanut, T.

AU - Natkaniec, Z.

AU - Nayak, M.

AU - Nisar, N. K.

AU - Nishida, S.

AU - Ogawa, S.

AU - Okuno, S.

AU - Olsen, S. L.

AU - Ostrowicz, W.

AU - Oswald, C.

AU - Pakhlova, G.

AU - Pal, B.

AU - Park, H.

AU - Pedlar, T. K.

AU - Pesántez, L.

AU - Pestotnik, R.

AU - Petrič, M.

AU - Piilonen, L. E.

AU - RibeŽl, E.

AU - Ritter, M.

AU - Rostomyan, A.

AU - Ryu, S.

AU - Sakai, Y.

AU - Sandilya, S.

AU - Santelj, L.

AU - Sanuki, T.

AU - Sato, Y.

AU - Savinov, V.

AU - Schneider, O.

AU - Schnell, G.

AU - Schwanda, C.

AU - Semmler, D.

AU - Senyo, K.

AU - Sevior, M. E.

AU - Shapkin, M.

AU - Shebalin, V.

AU - Shen, C. P.

AU - Shibata, T. A.

AU - Shiu, J. G.

AU - Shwartz, B.

AU - Sibidanov, A.

AU - Simon, F.

AU - Sohn, Y. S.

AU - Sokolov, A.

AU - Starič, M.

AU - Steder, M.

AU - Stypula, J.

AU - Tanida, K.

AU - Teramoto, Y.

AU - Trabelsi, K.

AU - Uchida, M.

AU - Uglov, T.

AU - Unno, Y.

AU - Uno, S.

AU - Urquijo, P.

AU - Van Hulse, C.

AU - Vanhoefer, P.

AU - Varner, G.

AU - Vinokurova, A.

AU - Vossen, A.

AU - Wagner, M. N.

AU - Wang, M. Z.

AU - Wang, X. L.

AU - Watanabe, Y.

AU - Williams, K. M.

AU - Won, Eunil

AU - Yamaoka, J.

AU - Yashchenko, S.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zhulanov, V.

AU - Zupanc, A.

PY - 2015/9/29

Y1 - 2015/9/29

N2 - 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)%.

AB - 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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U2 - 10.1103/PhysRevLett.115.142001

DO - 10.1103/PhysRevLett.115.142001

M3 - Article

AN - SCOPUS:84944128180

VL - 115

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 14

M1 - 142001

ER -