First observation of the P-wave spin-singlet bottomonium states h b(1P) and h b(2P)

I. Adachi, H. Aihara, K. Arinstein, D. M. Asner, T. Aushev, T. Aziz, A. M. Bakich, E. Barberio, K. Belous, V. Bhardwaj, B. Bhuyan, A. Bondar, M. Bračko, J. Brodzicka, T. E. Browder, P. Chang, A. Chen, P. Chen, B. G. Cheon, K. Chilikin & 136 others R. Chistov, I. S. Cho, K. Cho, Y. Choi, J. Dalseno, M. Danilov, Z. Drásal, A. Drutskoy, S. Eidelman, D. Epifanov, S. Esen, J. E. Fast, M. Feindt, V. Gaur, N. Gabyshev, A. Garmash, Y. M. Goh, B. Golob, T. Hara, K. Hayasaka, H. Hayashii, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. J. Hyun, T. Iijima, A. Ishikawa, M. Iwabuchi, Y. Iwasaki, I. Jaegle, T. Julius, J. H. Kang, N. Katayama, T. Kawasaki, H. Kichimi, H. O. Kim, J. B. Kim, K. T. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, N. Kobayashi, S. Koblitz, S. Korpar, P. Križan, T. Kuhr, T. Kumita, A. Kuzmin, Y. J. Kwon, J. S. Lange, S. H. Lee, J. Li, J. Libby, C. Liu, D. Liventsev, R. Louvot, J. MacNaughton, D. Matvienko, S. McOnie, K. Miyabayashi, H. Miyata, Y. Miyazaki, R. Mizuk, G. B. Mohanty, R. Mussa, Y. Nagasaka, E. Nakano, M. Nakao, H. Nakazawa, Z. Natkaniec, S. Neubauer, S. Nishida, K. Nishimura, O. Nitoh, T. Nozaki, T. Ohshima, S. Okuno, S. L. Olsen, Y. Onuki, P. Pakhlov, G. Pakhlova, H. Park, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen, A. Poluektov, M. Ritter, M. Röhrken, S. Ryu, H. Sahoo, Y. Sakai, T. Sanuki, O. Schneider, C. Schwanda, A. J. Schwartz, K. Senyo, O. Seon, M. E. Sevior, M. Shapkin, V. Shebalin, T. A. Shibata, J. G. Shiu, B. Shwartz, F. Simon, P. Smerkol, Y. S. Sohn, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, M. Sumihama, G. Tatishvili, Y. Teramoto, I. Tikhomirov, K. Trabelsi, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, S. E. Vahsen, G. Varner, K. E. Varvell, A. Vinokurova, C. H. Wang, X. L. Wang, Y. Watanabe, J. Wicht, Eunil Won, B. D. Yabsley, Y. Yamashita, C. Z. Yuan, V. Zhilich, A. Zupanc

Research output: Contribution to journalArticle

110 Citations (Scopus)

Abstract

We report the first observations of the spin-singlet bottomonium states h b(1P) and h b(2P). The states are produced in the reaction e +e -→h b(nP)π +π - using a 121.4fb -1 data sample collected at energies near the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e +e - collider. We determine M[h b(1P)]=(9898.2- 1.0-1.1+1.1+1.0)MeV/c2 and M[h b(2P)]=(10259.8±0.6-1.0+1.4)MeV/ c2, which correspond to P-wave hyperfine splittings ΔM HF=(+1. 7±1.5) and (+0.5-1.2+1.6)MeV/c2, respectively. The significances of the h b(1P) and h b(2P) are 5.5σ and 11.2σ, respectively. We find that the production of the h b(1P) and h b(2P) is not suppressed relative to the production of the Υ(1S), Υ(2S), and Υ(3S).

Original languageEnglish
Article number032001
JournalPhysical Review Letters
Volume108
Issue number3
DOIs
Publication statusPublished - 2012 Jan 18

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P waves
energy
detectors

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Adachi, I., Aihara, H., Arinstein, K., Asner, D. M., Aushev, T., Aziz, T., ... Zupanc, A. (2012). First observation of the P-wave spin-singlet bottomonium states h b(1P) and h b(2P). Physical Review Letters, 108(3), [032001]. https://doi.org/10.1103/PhysRevLett.108.032001

First observation of the P-wave spin-singlet bottomonium states h b(1P) and h b(2P). / Adachi, I.; Aihara, H.; Arinstein, K.; Asner, D. M.; Aushev, T.; Aziz, T.; Bakich, A. M.; Barberio, E.; Belous, K.; Bhardwaj, V.; Bhuyan, B.; Bondar, A.; Bračko, M.; Brodzicka, J.; Browder, T. E.; Chang, P.; Chen, A.; Chen, P.; Cheon, B. G.; Chilikin, K.; Chistov, R.; Cho, I. S.; Cho, K.; Choi, Y.; Dalseno, J.; Danilov, M.; Drásal, Z.; Drutskoy, A.; Eidelman, S.; Epifanov, D.; Esen, S.; Fast, J. E.; Feindt, M.; Gaur, V.; Gabyshev, N.; Garmash, A.; Goh, Y. M.; Golob, B.; Hara, T.; Hayasaka, K.; Hayashii, H.; Hoshi, Y.; Hou, W. S.; Hsiung, Y. B.; Hyun, H. J.; Iijima, T.; Ishikawa, A.; Iwabuchi, M.; Iwasaki, Y.; Jaegle, I.; Julius, T.; Kang, J. H.; Katayama, N.; Kawasaki, T.; Kichimi, H.; Kim, H. O.; Kim, J. B.; Kim, K. T.; Kim, M. J.; Kim, Y. J.; Kinoshita, K.; Ko, B. R.; Kobayashi, N.; Koblitz, S.; Korpar, S.; Križan, P.; Kuhr, T.; Kumita, T.; Kuzmin, A.; Kwon, Y. J.; Lange, J. S.; Lee, S. H.; Li, J.; Libby, J.; Liu, C.; Liventsev, D.; Louvot, R.; MacNaughton, J.; Matvienko, D.; McOnie, S.; Miyabayashi, K.; Miyata, H.; Miyazaki, Y.; Mizuk, R.; Mohanty, G. B.; Mussa, R.; Nagasaka, Y.; Nakano, E.; Nakao, M.; Nakazawa, H.; Natkaniec, Z.; Neubauer, S.; Nishida, S.; Nishimura, K.; Nitoh, O.; Nozaki, T.; Ohshima, T.; Okuno, S.; Olsen, S. L.; Onuki, Y.; Pakhlov, P.; Pakhlova, G.; Park, H.; Pedlar, T. K.; Pestotnik, R.; Petrič, M.; Piilonen, L. E.; Poluektov, A.; Ritter, M.; Röhrken, M.; Ryu, S.; Sahoo, H.; Sakai, Y.; Sanuki, T.; Schneider, O.; Schwanda, C.; Schwartz, A. J.; Senyo, K.; Seon, O.; Sevior, M. E.; Shapkin, M.; Shebalin, V.; Shibata, T. A.; Shiu, J. G.; Shwartz, B.; Simon, F.; Smerkol, P.; Sohn, Y. S.; Sokolov, A.; Solovieva, E.; Stanič, S.; Starič, M.; Sumihama, M.; Tatishvili, G.; Teramoto, Y.; Tikhomirov, I.; Trabelsi, K.; Uchida, M.; Uehara, S.; Uglov, T.; Unno, Y.; Uno, S.; Vahsen, S. E.; Varner, G.; Varvell, K. E.; Vinokurova, A.; Wang, C. H.; Wang, X. L.; Watanabe, Y.; Wicht, J.; Won, Eunil; Yabsley, B. D.; Yamashita, Y.; Yuan, C. Z.; Zhilich, V.; Zupanc, A.

In: Physical Review Letters, Vol. 108, No. 3, 032001, 18.01.2012.

Research output: Contribution to journalArticle

Adachi, I, Aihara, H, Arinstein, K, Asner, DM, Aushev, T, Aziz, T, Bakich, AM, Barberio, E, Belous, K, Bhardwaj, V, Bhuyan, B, Bondar, A, Bračko, M, Brodzicka, J, Browder, TE, Chang, P, Chen, A, Chen, P, Cheon, BG, Chilikin, K, Chistov, R, Cho, IS, Cho, K, Choi, Y, Dalseno, J, Danilov, M, Drásal, Z, Drutskoy, A, Eidelman, S, Epifanov, D, Esen, S, Fast, JE, Feindt, M, Gaur, V, Gabyshev, N, Garmash, A, Goh, YM, Golob, B, Hara, T, Hayasaka, K, Hayashii, H, Hoshi, Y, Hou, WS, Hsiung, YB, Hyun, HJ, Iijima, T, Ishikawa, A, Iwabuchi, M, Iwasaki, Y, Jaegle, I, Julius, T, Kang, JH, Katayama, N, Kawasaki, T, Kichimi, H, Kim, HO, Kim, JB, Kim, KT, Kim, MJ, Kim, YJ, Kinoshita, K, Ko, BR, Kobayashi, N, Koblitz, S, Korpar, S, Križan, P, Kuhr, T, Kumita, T, Kuzmin, A, Kwon, YJ, Lange, JS, Lee, SH, Li, J, Libby, J, Liu, C, Liventsev, D, Louvot, R, MacNaughton, J, Matvienko, D, McOnie, S, Miyabayashi, K, Miyata, H, Miyazaki, Y, Mizuk, R, Mohanty, GB, Mussa, R, Nagasaka, Y, Nakano, E, Nakao, M, Nakazawa, H, Natkaniec, Z, Neubauer, S, Nishida, S, Nishimura, K, Nitoh, O, Nozaki, T, Ohshima, T, Okuno, S, Olsen, SL, Onuki, Y, Pakhlov, P, Pakhlova, G, Park, H, Pedlar, TK, Pestotnik, R, Petrič, M, Piilonen, LE, Poluektov, A, Ritter, M, Röhrken, M, Ryu, S, Sahoo, H, Sakai, Y, Sanuki, T, Schneider, O, Schwanda, C, Schwartz, AJ, Senyo, K, Seon, O, Sevior, ME, Shapkin, M, Shebalin, V, Shibata, TA, Shiu, JG, Shwartz, B, Simon, F, Smerkol, P, Sohn, YS, Sokolov, A, Solovieva, E, Stanič, S, Starič, M, Sumihama, M, Tatishvili, G, Teramoto, Y, Tikhomirov, I, Trabelsi, K, Uchida, M, Uehara, S, Uglov, T, Unno, Y, Uno, S, Vahsen, SE, Varner, G, Varvell, KE, Vinokurova, A, Wang, CH, Wang, XL, Watanabe, Y, Wicht, J, Won, E, Yabsley, BD, Yamashita, Y, Yuan, CZ, Zhilich, V & Zupanc, A 2012, 'First observation of the P-wave spin-singlet bottomonium states h b(1P) and h b(2P)', Physical Review Letters, vol. 108, no. 3, 032001. https://doi.org/10.1103/PhysRevLett.108.032001
Adachi, I. ; Aihara, H. ; Arinstein, K. ; Asner, D. M. ; Aushev, T. ; Aziz, T. ; Bakich, A. M. ; Barberio, E. ; Belous, K. ; Bhardwaj, V. ; Bhuyan, B. ; Bondar, A. ; Bračko, M. ; Brodzicka, J. ; Browder, T. E. ; Chang, P. ; Chen, A. ; Chen, P. ; Cheon, B. G. ; Chilikin, K. ; Chistov, R. ; Cho, I. S. ; Cho, K. ; Choi, Y. ; Dalseno, J. ; Danilov, M. ; Drásal, Z. ; Drutskoy, A. ; Eidelman, S. ; Epifanov, D. ; Esen, S. ; Fast, J. E. ; Feindt, M. ; Gaur, V. ; Gabyshev, N. ; Garmash, A. ; Goh, Y. M. ; Golob, B. ; Hara, T. ; Hayasaka, K. ; Hayashii, H. ; Hoshi, Y. ; Hou, W. S. ; Hsiung, Y. B. ; Hyun, H. J. ; Iijima, T. ; Ishikawa, A. ; Iwabuchi, M. ; Iwasaki, Y. ; Jaegle, I. ; Julius, T. ; Kang, J. H. ; Katayama, N. ; Kawasaki, T. ; Kichimi, H. ; Kim, H. O. ; Kim, J. B. ; Kim, K. T. ; Kim, M. J. ; Kim, Y. J. ; Kinoshita, K. ; Ko, B. R. ; Kobayashi, N. ; Koblitz, S. ; Korpar, S. ; Križan, P. ; Kuhr, T. ; Kumita, T. ; Kuzmin, A. ; Kwon, Y. J. ; Lange, J. S. ; Lee, S. H. ; Li, J. ; Libby, J. ; Liu, C. ; Liventsev, D. ; Louvot, R. ; MacNaughton, J. ; Matvienko, D. ; McOnie, S. ; Miyabayashi, K. ; Miyata, H. ; Miyazaki, Y. ; Mizuk, R. ; Mohanty, G. B. ; Mussa, R. ; Nagasaka, Y. ; Nakano, E. ; Nakao, M. ; Nakazawa, H. ; Natkaniec, Z. ; Neubauer, S. ; Nishida, S. ; Nishimura, K. ; Nitoh, O. ; Nozaki, T. ; Ohshima, T. ; Okuno, S. ; Olsen, S. L. ; Onuki, Y. ; Pakhlov, P. ; Pakhlova, G. ; Park, H. ; Pedlar, T. K. ; Pestotnik, R. ; Petrič, M. ; Piilonen, L. E. ; Poluektov, A. ; Ritter, M. ; Röhrken, M. ; Ryu, S. ; Sahoo, H. ; Sakai, Y. ; Sanuki, T. ; Schneider, O. ; Schwanda, C. ; Schwartz, A. J. ; Senyo, K. ; Seon, O. ; Sevior, M. E. ; Shapkin, M. ; Shebalin, V. ; Shibata, T. A. ; Shiu, J. G. ; Shwartz, B. ; Simon, F. ; Smerkol, P. ; Sohn, Y. S. ; Sokolov, A. ; Solovieva, E. ; Stanič, S. ; Starič, M. ; Sumihama, M. ; Tatishvili, G. ; Teramoto, Y. ; Tikhomirov, I. ; Trabelsi, K. ; Uchida, M. ; Uehara, S. ; Uglov, T. ; Unno, Y. ; Uno, S. ; Vahsen, S. E. ; Varner, G. ; Varvell, K. E. ; Vinokurova, A. ; Wang, C. H. ; Wang, X. L. ; Watanabe, Y. ; Wicht, J. ; Won, Eunil ; Yabsley, B. D. ; Yamashita, Y. ; Yuan, C. Z. ; Zhilich, V. ; Zupanc, A. / First observation of the P-wave spin-singlet bottomonium states h b(1P) and h b(2P). In: Physical Review Letters. 2012 ; Vol. 108, No. 3.
@article{ef041953a76643ff9502e6e3eaae0674,
title = "First observation of the P-wave spin-singlet bottomonium states h b(1P) and h b(2P)",
abstract = "We report the first observations of the spin-singlet bottomonium states h b(1P) and h b(2P). The states are produced in the reaction e +e -→h b(nP)π +π - using a 121.4fb -1 data sample collected at energies near the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e +e - collider. We determine M[h b(1P)]=(9898.2- 1.0-1.1+1.1+1.0)MeV/c2 and M[h b(2P)]=(10259.8±0.6-1.0+1.4)MeV/ c2, which correspond to P-wave hyperfine splittings ΔM HF=(+1. 7±1.5) and (+0.5-1.2+1.6)MeV/c2, respectively. The significances of the h b(1P) and h b(2P) are 5.5σ and 11.2σ, respectively. We find that the production of the h b(1P) and h b(2P) is not suppressed relative to the production of the Υ(1S), Υ(2S), and Υ(3S).",
author = "I. Adachi and H. Aihara and K. Arinstein and Asner, {D. M.} and T. Aushev and T. Aziz and Bakich, {A. M.} and E. Barberio and K. Belous and V. Bhardwaj and B. Bhuyan and A. Bondar and M. Bračko and J. Brodzicka and Browder, {T. E.} and P. Chang and A. Chen and P. Chen and Cheon, {B. G.} and K. Chilikin and R. Chistov and Cho, {I. S.} and K. Cho and Y. Choi and J. Dalseno and M. Danilov and Z. Dr{\'a}sal and A. Drutskoy and S. Eidelman and D. Epifanov and S. Esen and Fast, {J. E.} and M. Feindt and V. Gaur and N. Gabyshev and A. Garmash and Goh, {Y. M.} and B. Golob and T. Hara and K. Hayasaka and H. Hayashii and Y. Hoshi and Hou, {W. S.} and Hsiung, {Y. B.} and Hyun, {H. J.} and T. Iijima and A. Ishikawa and M. Iwabuchi and Y. Iwasaki and I. Jaegle and T. Julius and Kang, {J. H.} and N. Katayama and T. Kawasaki and H. Kichimi and Kim, {H. O.} and Kim, {J. B.} and Kim, {K. T.} and Kim, {M. J.} and Kim, {Y. J.} and K. Kinoshita and Ko, {B. R.} and N. Kobayashi and S. Koblitz and S. Korpar and P. Križan and T. Kuhr and T. Kumita and A. Kuzmin and Kwon, {Y. J.} and Lange, {J. S.} and Lee, {S. H.} and J. Li and J. Libby and C. Liu and D. Liventsev and R. Louvot and J. MacNaughton and D. Matvienko and S. McOnie and K. Miyabayashi and H. Miyata and Y. Miyazaki and R. Mizuk and Mohanty, {G. B.} and R. Mussa and Y. Nagasaka and E. Nakano and M. Nakao and H. Nakazawa and Z. Natkaniec and S. Neubauer and S. Nishida and K. Nishimura and O. Nitoh and T. Nozaki and T. Ohshima and S. Okuno and Olsen, {S. L.} and Y. Onuki and P. Pakhlov and G. Pakhlova and H. Park and Pedlar, {T. K.} and R. Pestotnik and M. Petrič and Piilonen, {L. E.} and A. Poluektov and M. Ritter and M. R{\"o}hrken and S. Ryu and H. Sahoo and Y. Sakai and T. Sanuki and O. Schneider and C. Schwanda and Schwartz, {A. J.} and K. Senyo and O. Seon and Sevior, {M. E.} and M. Shapkin and V. Shebalin and Shibata, {T. A.} and Shiu, {J. G.} and B. Shwartz and F. Simon and P. Smerkol and Sohn, {Y. S.} and A. Sokolov and E. Solovieva and S. Stanič and M. Starič and M. Sumihama and G. Tatishvili and Y. Teramoto and I. Tikhomirov and K. Trabelsi and M. Uchida and S. Uehara and T. Uglov and Y. Unno and S. Uno and Vahsen, {S. E.} and G. Varner and Varvell, {K. E.} and A. Vinokurova and Wang, {C. H.} and Wang, {X. L.} and Y. Watanabe and J. Wicht and Eunil Won and Yabsley, {B. D.} and Y. Yamashita and Yuan, {C. Z.} and V. Zhilich and A. Zupanc",
year = "2012",
month = "1",
day = "18",
doi = "10.1103/PhysRevLett.108.032001",
language = "English",
volume = "108",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "3",

}

TY - JOUR

T1 - First observation of the P-wave spin-singlet bottomonium states h b(1P) and h b(2P)

AU - Adachi, I.

AU - Aihara, H.

AU - Arinstein, K.

AU - Asner, D. M.

AU - Aushev, T.

AU - Aziz, T.

AU - Bakich, A. M.

AU - Barberio, E.

AU - Belous, K.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Bondar, A.

AU - Bračko, M.

AU - Brodzicka, J.

AU - Browder, T. E.

AU - Chang, P.

AU - Chen, A.

AU - Chen, P.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Chistov, R.

AU - Cho, I. S.

AU - Cho, K.

AU - Choi, Y.

AU - Dalseno, J.

AU - Danilov, M.

AU - Drásal, Z.

AU - Drutskoy, A.

AU - Eidelman, S.

AU - Epifanov, D.

AU - Esen, S.

AU - Fast, J. E.

AU - Feindt, M.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Goh, Y. M.

AU - Golob, B.

AU - Hara, T.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Hoshi, Y.

AU - Hou, W. S.

AU - Hsiung, Y. B.

AU - Hyun, H. J.

AU - Iijima, T.

AU - Ishikawa, A.

AU - Iwabuchi, M.

AU - Iwasaki, Y.

AU - Jaegle, I.

AU - Julius, T.

AU - Kang, J. H.

AU - Katayama, N.

AU - Kawasaki, T.

AU - Kichimi, H.

AU - Kim, H. O.

AU - Kim, J. B.

AU - Kim, K. T.

AU - Kim, M. J.

AU - Kim, Y. J.

AU - Kinoshita, K.

AU - Ko, B. R.

AU - Kobayashi, N.

AU - Koblitz, S.

AU - Korpar, S.

AU - Križan, P.

AU - Kuhr, T.

AU - Kumita, T.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Lange, J. S.

AU - Lee, S. H.

AU - Li, J.

AU - Libby, J.

AU - Liu, C.

AU - Liventsev, D.

AU - Louvot, R.

AU - MacNaughton, J.

AU - Matvienko, D.

AU - McOnie, S.

AU - Miyabayashi, K.

AU - Miyata, H.

AU - Miyazaki, Y.

AU - Mizuk, R.

AU - Mohanty, G. B.

AU - Mussa, R.

AU - Nagasaka, Y.

AU - Nakano, E.

AU - Nakao, M.

AU - Nakazawa, H.

AU - Natkaniec, Z.

AU - Neubauer, S.

AU - Nishida, S.

AU - Nishimura, K.

AU - Nitoh, O.

AU - Nozaki, T.

AU - Ohshima, T.

AU - Okuno, S.

AU - Olsen, S. L.

AU - Onuki, Y.

AU - Pakhlov, P.

AU - Pakhlova, G.

AU - Park, H.

AU - Pedlar, T. K.

AU - Pestotnik, R.

AU - Petrič, M.

AU - Piilonen, L. E.

AU - Poluektov, A.

AU - Ritter, M.

AU - Röhrken, M.

AU - Ryu, S.

AU - Sahoo, H.

AU - Sakai, Y.

AU - Sanuki, T.

AU - Schneider, O.

AU - Schwanda, C.

AU - Schwartz, A. J.

AU - Senyo, K.

AU - Seon, O.

AU - Sevior, M. E.

AU - Shapkin, M.

AU - Shebalin, V.

AU - Shibata, T. A.

AU - Shiu, J. G.

AU - Shwartz, B.

AU - Simon, F.

AU - Smerkol, P.

AU - Sohn, Y. S.

AU - Sokolov, A.

AU - Solovieva, E.

AU - Stanič, S.

AU - Starič, M.

AU - Sumihama, M.

AU - Tatishvili, G.

AU - Teramoto, Y.

AU - Tikhomirov, I.

AU - Trabelsi, K.

AU - Uchida, M.

AU - Uehara, S.

AU - Uglov, T.

AU - Unno, Y.

AU - Uno, S.

AU - Vahsen, S. E.

AU - Varner, G.

AU - Varvell, K. E.

AU - Vinokurova, A.

AU - Wang, C. H.

AU - Wang, X. L.

AU - Watanabe, Y.

AU - Wicht, J.

AU - Won, Eunil

AU - Yabsley, B. D.

AU - Yamashita, Y.

AU - Yuan, C. Z.

AU - Zhilich, V.

AU - Zupanc, A.

PY - 2012/1/18

Y1 - 2012/1/18

N2 - We report the first observations of the spin-singlet bottomonium states h b(1P) and h b(2P). The states are produced in the reaction e +e -→h b(nP)π +π - using a 121.4fb -1 data sample collected at energies near the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e +e - collider. We determine M[h b(1P)]=(9898.2- 1.0-1.1+1.1+1.0)MeV/c2 and M[h b(2P)]=(10259.8±0.6-1.0+1.4)MeV/ c2, which correspond to P-wave hyperfine splittings ΔM HF=(+1. 7±1.5) and (+0.5-1.2+1.6)MeV/c2, respectively. The significances of the h b(1P) and h b(2P) are 5.5σ and 11.2σ, respectively. We find that the production of the h b(1P) and h b(2P) is not suppressed relative to the production of the Υ(1S), Υ(2S), and Υ(3S).

AB - We report the first observations of the spin-singlet bottomonium states h b(1P) and h b(2P). The states are produced in the reaction e +e -→h b(nP)π +π - using a 121.4fb -1 data sample collected at energies near the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e +e - collider. We determine M[h b(1P)]=(9898.2- 1.0-1.1+1.1+1.0)MeV/c2 and M[h b(2P)]=(10259.8±0.6-1.0+1.4)MeV/ c2, which correspond to P-wave hyperfine splittings ΔM HF=(+1. 7±1.5) and (+0.5-1.2+1.6)MeV/c2, respectively. The significances of the h b(1P) and h b(2P) are 5.5σ and 11.2σ, respectively. We find that the production of the h b(1P) and h b(2P) is not suppressed relative to the production of the Υ(1S), Υ(2S), and Υ(3S).

UR - http://www.scopus.com/inward/record.url?scp=84862907461&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84862907461&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.108.032001

DO - 10.1103/PhysRevLett.108.032001

M3 - Article

VL - 108

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 3

M1 - 032001

ER -