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Title: Observation of ϒ ( 2 S ) → γ η b ( 1 S ) Decay

Abstract

We report the observation of Υ(2S) → γηb(1S) decay based on analysis of the inclusive photon spectrum of 24.7 fb-1 of e+e- collisions at the Υ(2S) center-of-mass energy collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. We measure a branching fraction of B(Υ(2S) → γηb (1S)] = (6.1$$+0.6+0.9\atop{-0.7-0.6}$$) × 10-4, and derive an ηb (1S) mass of 9394.8$$+2.7+4.5\atop{-3.1-2.7}$$ MeV/c2, 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.

Authors:
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Publication Date:
Research Org.:
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Univ. of Hawaii, Honolulu, HI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); Ministry of Education, Culture, Sports, Science and Technology; National Science Foundation (NSF)
Contributing Org.:
Belle Collaboration
OSTI Identifier:
1484328
Alternate Identifier(s):
OSTI ID: 1488838; OSTI ID: 1592742; OSTI ID: 1593901
Report Number(s):
BNL-210814-2018-JAAM; PNNL-SA-130815
Journal ID: ISSN 0031-9007; PRLTAO; 232001
Grant/Contract Number:  
SC0009973; AC05-76RL01830; DP180102629; DP170102389; DP170102204; DP150103061; FT130100303; P 26794-N20; SC0012704; SC0010504
Resource Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Name: Physical Review Letters Journal Volume: 121 Journal Issue: 23; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Fulsom, B. G., Pedlar, T. K., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Atmacan, H., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bakich, A. M., Bansal, V., Behera, P., Beleño, C., Berger, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswal, J., Bondar, A., Bonvicini, G., Bozek, A., Bračko, M., Browder, T. E., Cao, L., Červenkov, D., Chekelian, V., Chen, A., Cheon, B. G., Chilikin, K., Cho, K., Choi, S. -K., Choi, Y., Choudhury, S., Cinabro, D., Cunliffe, S., Dash, N., Di Carlo, S., Dingfelder, J., Doležal, Z., Dong, T. V., Drásal, Z., Eidelman, S., Epifanov, D., Fast, J. E., Ferber, T., Garg, R., Gaur, V., Gabyshev, N., Garmash, A., Gelb, M., Giri, A., Goldenzweig, P., Guido, E., Haba, J., Hayasaka, K., Hayashii, H., Hirose, S., Hou, W. -S., Iijima, T., Inami, K., Inguglia, G., Ishikawa, A., Itoh, R., Iwasaki, M., Iwasaki, Y., Jacobs, W. W., Jeon, H. B., Jia, S., Jin, Y., Joffe, D., Joo, K. K., Julius, T., Kawasaki, T., Kichimi, H., Kiesling, C., Kim, D. Y., Kim, H. J., Kim, J. B., Kim, K. T., Kim, S. H., Kinoshita, K., Kodyš, P., Korpar, S., Kotchetkov, D., Križan, P., Kroeger, R., Krokovny, P., Kuhr, T., Kulasiri, R., Kuzmin, A., Kwon, Y. -J., Lange, J. S., Lee, I. S., Lee, S. C., Li, L. K., Li, Y. B., Li Gioi, L., Libby, J., Liventsev, D., Lubej, M., Luo, T., Masuda, M., Matsuda, T., Matvienko, D., Merola, M., Miyabayashi, K., Miyata, H., Mizuk, R., Mohanty, G. B., Moon, H. K., Mori, T., Mussa, R., Nakao, M., Nanut, T., Nath, K. J., Natkaniec, Z., Nayak, M., Niiyama, M., Nisar, N. K., Nishida, S., Ogawa, S., Okuno, S., Ono, H., Pakhlov, P., Pakhlova, G., Pal, B., Pardi, S., Park, H., Paul, S., Pestotnik, R., Piilonen, L. E., Popov, V., Prencipe, E., Rabusov, A., Ritter, M., Rostomyan, A., Russo, G., Sakai, Y., Salehi, M., Sandilya, S., Santelj, L., Sanuki, T., Savinov, V., Schneider, O., Schnell, G., Schwanda, C., Seino, Y., Senyo, K., Sevior, M. E., Shebalin, V., Shen, C. P., Shibata, T. -A., Shiu, J. -G., Shwartz, B., Simon, F., Singh, J. B., Sokolov, A., Solovieva, E., Starič, M., Strube, J. F., Sumihama, M., Sumisawa, K., Sumiyoshi, T., Sutcliffe, W., Takizawa, M., Tamponi, U., Tanida, K., Tenchini, F., Uchida, M., Uglov, T., Unno, Y., Uno, S., Urquijo, P., Vahsen, S. E., Van Hulse, C., Van Tonder, R., Varner, G., Vinokurova, A., Vorobyev, V., Vossen, A., Wang, B., Wang, C. H., Wang, P., Wang, X. L., Watanabe, M., Watanuki, S., Widmann, E., Won, E., Ye, H., Yin, J. H., Yuan, C. Z., Zhang, Z. P., Zhilich, V., Zhukova, V., Zhulanov, V., Zupanc, A., and Belle Collaboration. Observation of ϒ ( 2 S ) → γ η b ( 1 S ) Decay. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.121.232001.
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Fulsom, B. G., Pedlar, T. K., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Atmacan, H., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bakich, A. M., Bansal, V., Behera, P., Beleño, C., Berger, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswal, J., Bondar, A., Bonvicini, G., Bozek, A., Bračko, M., Browder, T. E., Cao, L., Červenkov, D., Chekelian, V., Chen, A., Cheon, B. G., Chilikin, K., Cho, K., Choi, S. -K., Choi, Y., Choudhury, S., Cinabro, D., Cunliffe, S., Dash, N., Di Carlo, S., Dingfelder, J., Doležal, Z., Dong, T. V., Drásal, Z., Eidelman, S., Epifanov, D., Fast, J. E., Ferber, T., Garg, R., Gaur, V., Gabyshev, N., Garmash, A., Gelb, M., Giri, A., Goldenzweig, P., Guido, E., Haba, J., Hayasaka, K., Hayashii, H., Hirose, S., Hou, W. -S., Iijima, T., Inami, K., Inguglia, G., Ishikawa, A., Itoh, R., Iwasaki, M., Iwasaki, Y., Jacobs, W. W., Jeon, H. B., Jia, S., Jin, Y., Joffe, D., Joo, K. K., Julius, T., Kawasaki, T., Kichimi, H., Kiesling, C., Kim, D. Y., Kim, H. J., Kim, J. B., Kim, K. T., Kim, S. H., Kinoshita, K., Kodyš, P., Korpar, S., Kotchetkov, D., Križan, P., Kroeger, R., Krokovny, P., Kuhr, T., Kulasiri, R., Kuzmin, A., Kwon, Y. -J., Lange, J. S., Lee, I. S., Lee, S. C., Li, L. K., Li, Y. B., Li Gioi, L., Libby, J., Liventsev, D., Lubej, M., Luo, T., Masuda, M., Matsuda, T., Matvienko, D., Merola, M., Miyabayashi, K., Miyata, H., Mizuk, R., Mohanty, G. B., Moon, H. K., Mori, T., Mussa, R., Nakao, M., Nanut, T., Nath, K. J., Natkaniec, Z., Nayak, M., Niiyama, M., Nisar, N. K., Nishida, S., Ogawa, S., Okuno, S., Ono, H., Pakhlov, P., Pakhlova, G., Pal, B., Pardi, S., Park, H., Paul, S., Pestotnik, R., Piilonen, L. E., Popov, V., Prencipe, E., Rabusov, A., Ritter, M., Rostomyan, A., Russo, G., Sakai, Y., Salehi, M., Sandilya, S., Santelj, L., Sanuki, T., Savinov, V., Schneider, O., Schnell, G., Schwanda, C., Seino, Y., Senyo, K., Sevior, M. E., Shebalin, V., Shen, C. P., Shibata, T. -A., Shiu, J. -G., Shwartz, B., Simon, F., Singh, J. B., Sokolov, A., Solovieva, E., Starič, M., Strube, J. F., Sumihama, M., Sumisawa, K., Sumiyoshi, T., Sutcliffe, W., Takizawa, M., Tamponi, U., Tanida, K., Tenchini, F., Uchida, M., Uglov, T., Unno, Y., Uno, S., Urquijo, P., Vahsen, S. E., Van Hulse, C., Van Tonder, R., Varner, G., Vinokurova, A., Vorobyev, V., Vossen, A., Wang, B., Wang, C. H., Wang, P., Wang, X. L., Watanabe, M., Watanuki, S., Widmann, E., Won, E., Ye, H., Yin, J. H., Yuan, C. Z., Zhang, Z. P., Zhilich, V., Zhukova, V., Zhulanov, V., Zupanc, A., & Belle Collaboration. Observation of ϒ ( 2 S ) → γ η b ( 1 S ) Decay. United States. https://doi.org/10.1103/PhysRevLett.121.232001
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Fulsom, B. G., Pedlar, T. K., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Atmacan, H., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bakich, A. M., Bansal, V., Behera, P., Beleño, C., Berger, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswal, J., Bondar, A., Bonvicini, G., Bozek, A., Bračko, M., Browder, T. E., Cao, L., Červenkov, D., Chekelian, V., Chen, A., Cheon, B. G., Chilikin, K., Cho, K., Choi, S. -K., Choi, Y., Choudhury, S., Cinabro, D., Cunliffe, S., Dash, N., Di Carlo, S., Dingfelder, J., Doležal, Z., Dong, T. V., Drásal, Z., Eidelman, S., Epifanov, D., Fast, J. E., Ferber, T., Garg, R., Gaur, V., Gabyshev, N., Garmash, A., Gelb, M., Giri, A., Goldenzweig, P., Guido, E., Haba, J., Hayasaka, K., Hayashii, H., Hirose, S., Hou, W. -S., Iijima, T., Inami, K., Inguglia, G., Ishikawa, A., Itoh, R., Iwasaki, M., Iwasaki, Y., Jacobs, W. W., Jeon, H. B., Jia, S., Jin, Y., Joffe, D., Joo, K. K., Julius, T., Kawasaki, T., Kichimi, H., Kiesling, C., Kim, D. Y., Kim, H. J., Kim, J. B., Kim, K. T., Kim, S. H., Kinoshita, K., Kodyš, P., Korpar, S., Kotchetkov, D., Križan, P., Kroeger, R., Krokovny, P., Kuhr, T., Kulasiri, R., Kuzmin, A., Kwon, Y. -J., Lange, J. S., Lee, I. S., Lee, S. C., Li, L. K., Li, Y. B., Li Gioi, L., Libby, J., Liventsev, D., Lubej, M., Luo, T., Masuda, M., Matsuda, T., Matvienko, D., Merola, M., Miyabayashi, K., Miyata, H., Mizuk, R., Mohanty, G. B., Moon, H. K., Mori, T., Mussa, R., Nakao, M., Nanut, T., Nath, K. J., Natkaniec, Z., Nayak, M., Niiyama, M., Nisar, N. K., Nishida, S., Ogawa, S., Okuno, S., Ono, H., Pakhlov, P., Pakhlova, G., Pal, B., Pardi, S., Park, H., Paul, S., Pestotnik, R., Piilonen, L. E., Popov, V., Prencipe, E., Rabusov, A., Ritter, M., Rostomyan, A., Russo, G., Sakai, Y., Salehi, M., Sandilya, S., Santelj, L., Sanuki, T., Savinov, V., Schneider, O., Schnell, G., Schwanda, C., Seino, Y., Senyo, K., Sevior, M. E., Shebalin, V., Shen, C. P., Shibata, T. -A., Shiu, J. -G., Shwartz, B., Simon, F., Singh, J. B., Sokolov, A., Solovieva, E., Starič, M., Strube, J. F., Sumihama, M., Sumisawa, K., Sumiyoshi, T., Sutcliffe, W., Takizawa, M., Tamponi, U., Tanida, K., Tenchini, F., Uchida, M., Uglov, T., Unno, Y., Uno, S., Urquijo, P., Vahsen, S. E., Van Hulse, C., Van Tonder, R., Varner, G., Vinokurova, A., Vorobyev, V., Vossen, A., Wang, B., Wang, C. H., Wang, P., Wang, X. L., Watanabe, M., Watanuki, S., Widmann, E., Won, E., Ye, H., Yin, J. H., Yuan, C. Z., Zhang, Z. P., Zhilich, V., Zhukova, V., Zhulanov, V., Zupanc, A., and Belle Collaboration. Mon . "Observation of ϒ ( 2 S ) → γ η b ( 1 S ) Decay". United States. https://doi.org/10.1103/PhysRevLett.121.232001.
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@article{osti_1484328,
title = {Observation of ϒ ( 2 S ) → γ η b ( 1 S ) Decay},
author = {Fulsom, B. G. and Pedlar, T. K. and Adachi, I. and Aihara, H. and Al Said, S. and Asner, D. M. and Atmacan, H. and Aulchenko, V. and Aushev, T. and Ayad, R. and Babu, V. and Badhrees, I. and Bakich, A. M. and Bansal, V. and Behera, P. and Beleño, C. and Berger, M. and Bhardwaj, V. and Bhuyan, B. and Bilka, T. and Biswal, J. and Bondar, A. and Bonvicini, G. and Bozek, A. and Bračko, M. and Browder, T. E. and Cao, L. and Červenkov, D. and Chekelian, V. and Chen, A. and Cheon, B. G. and Chilikin, K. and Cho, K. and Choi, S. -K. and Choi, Y. and Choudhury, S. and Cinabro, D. and Cunliffe, S. and Dash, N. and Di Carlo, S. and Dingfelder, J. and Doležal, Z. and Dong, T. V. and Drásal, Z. and Eidelman, S. and Epifanov, D. and Fast, J. E. and Ferber, T. and Garg, R. and Gaur, V. and Gabyshev, N. and Garmash, A. and Gelb, M. and Giri, A. and Goldenzweig, P. and Guido, E. and Haba, J. and Hayasaka, K. and Hayashii, H. and Hirose, S. and Hou, W. -S. and Iijima, T. and Inami, K. and Inguglia, G. and Ishikawa, A. and Itoh, R. and Iwasaki, M. and Iwasaki, Y. and Jacobs, W. W. and Jeon, H. B. and Jia, S. and Jin, Y. and Joffe, D. and Joo, K. K. and Julius, T. and Kawasaki, T. and Kichimi, H. and Kiesling, C. and Kim, D. Y. and Kim, H. J. and Kim, J. B. and Kim, K. T. and Kim, S. H. and Kinoshita, K. and Kodyš, P. and Korpar, S. and Kotchetkov, D. and Križan, P. and Kroeger, R. and Krokovny, P. and Kuhr, T. and Kulasiri, R. and Kuzmin, A. and Kwon, Y. -J. and Lange, J. S. and Lee, I. S. and Lee, S. C. and Li, L. K. and Li, Y. B. and Li Gioi, L. and Libby, J. and Liventsev, D. and Lubej, M. and Luo, T. and Masuda, M. and Matsuda, T. and Matvienko, D. and Merola, M. and Miyabayashi, K. and Miyata, H. and Mizuk, R. and Mohanty, G. B. and Moon, H. K. and Mori, T. and Mussa, R. and Nakao, M. and Nanut, T. and Nath, K. J. and Natkaniec, Z. and Nayak, M. and Niiyama, M. and Nisar, N. K. and Nishida, S. and Ogawa, S. and Okuno, S. and Ono, H. and Pakhlov, P. and Pakhlova, G. and Pal, B. and Pardi, S. and Park, H. and Paul, S. and Pestotnik, R. and Piilonen, L. E. and Popov, V. and Prencipe, E. and Rabusov, A. and Ritter, M. and Rostomyan, A. and Russo, G. and Sakai, Y. and Salehi, M. and Sandilya, S. and Santelj, L. and Sanuki, T. and Savinov, V. and Schneider, O. and Schnell, G. and Schwanda, C. and Seino, Y. and Senyo, K. and Sevior, M. E. and Shebalin, V. and Shen, C. P. and Shibata, T. -A. and Shiu, J. -G. and Shwartz, B. and Simon, F. and Singh, J. B. and Sokolov, A. and Solovieva, E. and Starič, M. and Strube, J. F. and Sumihama, M. and Sumisawa, K. and Sumiyoshi, T. and Sutcliffe, W. and Takizawa, M. and Tamponi, U. and Tanida, K. and Tenchini, F. and Uchida, M. and Uglov, T. and Unno, Y. and Uno, S. and Urquijo, P. and Vahsen, S. E. and Van Hulse, C. and Van Tonder, R. and Varner, G. and Vinokurova, A. and Vorobyev, V. and Vossen, A. and Wang, B. and Wang, C. H. and Wang, P. and Wang, X. L. and Watanabe, M. and Watanuki, S. and Widmann, E. and Won, E. and Ye, H. and Yin, J. H. and Yuan, C. Z. and Zhang, Z. P. and Zhilich, V. and Zhukova, V. and Zhulanov, V. and Zupanc, A. and Belle Collaboration},
abstractNote = {We report the observation of Υ(2S) → γηb(1S) decay based on analysis of the inclusive photon spectrum of 24.7 fb-1 of e+e- collisions at the Υ(2S) center-of-mass energy collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. We measure a branching fraction of B(Υ(2S) → γηb (1S)] = (6.1$+0.6+0.9\atop{-0.7-0.6}$) × 10-4, and derive an ηb (1S) mass of 9394.8$+2.7+4.5\atop{-3.1-2.7}$ MeV/c2, 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.},
doi = {10.1103/PhysRevLett.121.232001},
journal = {Physical Review Letters},
number = 23,
volume = 121,
place = {United States},
year = {Mon Dec 03 00:00:00 EST 2018},
month = {Mon Dec 03 00:00:00 EST 2018}
}
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Figures / Tables:

FIG. 1: FIG. 1:: E∗γ distribution from the data for the photons passing the selection criteria. The visible peaking structures are due to radiative transitions to and from the χb0,1,2(1P ) states. This analysis is concerned with the 300 < E∗γ < 800 MeV region, indicated by vertical lines. Due to itsmore » relative size, an Υ(2S) → γηb(1S) signal expected near 600 MeV is not seen at this scale.« less
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