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Title: First study of η c(1S), η(1760) and X(1835) production via η 'π⁺π⁻ final states in two-photon collisions

Abstract

The invariant mass spectrum of the η 'π⁺π⁻ final state produced in two-photon collisions is obtained using a 673 fb⁻¹ data sample collected in the vicinity of the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e⁺e⁻ collider. We observe a clear signal of the η c(1S) and measure its mass and width to be M(η c(1S))=(2982.7±1.8(stat)±2.2(syst)±0.3(model)) MeV/c² and Γ(η c(1S))=(37.8 +5.8 –5.3(stat)±2.8(syst)±1.4(model)) MeV/c². The third error is an uncertainty due to possible interference between the η c(1S) and a nonresonant component. We also report the first evidence for η(1760) decay toη 'π⁺π⁻; we find two solutions for its parameters, depending on the inclusion or not of the X(1835), whose existence is of marginal significance in our data. From a fit to the mass spectrum using coherent X(1835) and η(1760) resonant amplitudes, we set a 90% confidence level upper limit on the product ΓγγB(η 'π⁺π⁻) for the X(1835).

Authors:
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Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1103287
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Name: Physical Review. D, Particles, Fields, Gravitation and Cosmology Journal Volume: 86 Journal Issue: 5; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Zhang, C. C., Aihara, H., Asner, D. M., Aushev, T., Bakich, A. M., Ban, Y., Belous, K., Bischofberger, M., Browder, T. E., Chen, A., Cheon, B. G., Chilikin, K., Chistov, R., Choi, Y., Dalseno, J., Danilov, M., Eidelman, S., Feindt, M., Gaur, V., Gabyshev, N., Goh, Y. M., Han, Y. L., Hayashii, H., Horii, Y., Hou, W.-S., Hyun, H. J., Iijima, T., Inami, K., Ishikawa, A., Iwabuchi, M., Julius, T., Kiesling, C., Kim, H. O., Kim, M. J., Kim, Y. J., Ko, B. R., Kodyš, P., Korpar, S., Krokovny, P., Kuzmin, A., Li, J., Libby, J., Liu, Y., Liu, Z. Q., Louvot, R., Matvienko, D., McOnie, S., Mizuk, R., Nakano, E., Nakao, M., Nakazawa, H., Natkaniec, Z., Nishida, S., Ohshima, T., Okuno, S., Olsen, S. L., Pakhlov, P., Pakhlova, G., Park, H., Park, H. K., Pestotnik, R., Petrič, M., Piilonen, L. E., Röhrken, M., Ryu, S., Sahoo, H., Sakai, Y., Santel, D., Sanuki, T., Schneider, O., Schwanda, C., Sevior, M. E., Shapkin, M., Shebalin, V., Shen, C. P., Shibata, T.-A., Shiu, J.-G., Shwartz, B., Smerkol, P., Sohn, Y.-S., Solovieva, E., Stanič, S., Starič, M., Sumihama, M., Sumiyoshi, T., Tikhomirov, I., Uchida, M., Uehara, S., Uglov, T., Unno, Y., Uno, S., Varner, G., Vinokurova, A., Vorobyev, V., Wang, P., Wang, X. L., Watanabe, Y., Williams, K. M., Yabsley, B. D., Yamashita, Y., Yuan, C. Z., Zhang, Z. P., and Zhulanov, V. First study of ηc(1S), η(1760) and X(1835) production via η'π⁺π⁻ final states in two-photon collisions. United States: N. p., 2012. Web. doi:10.1103/PhysRevD.86.052002.
Zhang, C. C., Aihara, H., Asner, D. M., Aushev, T., Bakich, A. M., Ban, Y., Belous, K., Bischofberger, M., Browder, T. E., Chen, A., Cheon, B. G., Chilikin, K., Chistov, R., Choi, Y., Dalseno, J., Danilov, M., Eidelman, S., Feindt, M., Gaur, V., Gabyshev, N., Goh, Y. M., Han, Y. L., Hayashii, H., Horii, Y., Hou, W.-S., Hyun, H. J., Iijima, T., Inami, K., Ishikawa, A., Iwabuchi, M., Julius, T., Kiesling, C., Kim, H. O., Kim, M. J., Kim, Y. J., Ko, B. R., Kodyš, P., Korpar, S., Krokovny, P., Kuzmin, A., Li, J., Libby, J., Liu, Y., Liu, Z. Q., Louvot, R., Matvienko, D., McOnie, S., Mizuk, R., Nakano, E., Nakao, M., Nakazawa, H., Natkaniec, Z., Nishida, S., Ohshima, T., Okuno, S., Olsen, S. L., Pakhlov, P., Pakhlova, G., Park, H., Park, H. K., Pestotnik, R., Petrič, M., Piilonen, L. E., Röhrken, M., Ryu, S., Sahoo, H., Sakai, Y., Santel, D., Sanuki, T., Schneider, O., Schwanda, C., Sevior, M. E., Shapkin, M., Shebalin, V., Shen, C. P., Shibata, T.-A., Shiu, J.-G., Shwartz, B., Smerkol, P., Sohn, Y.-S., Solovieva, E., Stanič, S., Starič, M., Sumihama, M., Sumiyoshi, T., Tikhomirov, I., Uchida, M., Uehara, S., Uglov, T., Unno, Y., Uno, S., Varner, G., Vinokurova, A., Vorobyev, V., Wang, P., Wang, X. L., Watanabe, Y., Williams, K. M., Yabsley, B. D., Yamashita, Y., Yuan, C. Z., Zhang, Z. P., & Zhulanov, V. First study of ηc(1S), η(1760) and X(1835) production via η'π⁺π⁻ final states in two-photon collisions. United States. doi:10.1103/PhysRevD.86.052002.
Zhang, C. C., Aihara, H., Asner, D. M., Aushev, T., Bakich, A. M., Ban, Y., Belous, K., Bischofberger, M., Browder, T. E., Chen, A., Cheon, B. G., Chilikin, K., Chistov, R., Choi, Y., Dalseno, J., Danilov, M., Eidelman, S., Feindt, M., Gaur, V., Gabyshev, N., Goh, Y. M., Han, Y. L., Hayashii, H., Horii, Y., Hou, W.-S., Hyun, H. J., Iijima, T., Inami, K., Ishikawa, A., Iwabuchi, M., Julius, T., Kiesling, C., Kim, H. O., Kim, M. J., Kim, Y. J., Ko, B. R., Kodyš, P., Korpar, S., Krokovny, P., Kuzmin, A., Li, J., Libby, J., Liu, Y., Liu, Z. Q., Louvot, R., Matvienko, D., McOnie, S., Mizuk, R., Nakano, E., Nakao, M., Nakazawa, H., Natkaniec, Z., Nishida, S., Ohshima, T., Okuno, S., Olsen, S. L., Pakhlov, P., Pakhlova, G., Park, H., Park, H. K., Pestotnik, R., Petrič, M., Piilonen, L. E., Röhrken, M., Ryu, S., Sahoo, H., Sakai, Y., Santel, D., Sanuki, T., Schneider, O., Schwanda, C., Sevior, M. E., Shapkin, M., Shebalin, V., Shen, C. P., Shibata, T.-A., Shiu, J.-G., Shwartz, B., Smerkol, P., Sohn, Y.-S., Solovieva, E., Stanič, S., Starič, M., Sumihama, M., Sumiyoshi, T., Tikhomirov, I., Uchida, M., Uehara, S., Uglov, T., Unno, Y., Uno, S., Varner, G., Vinokurova, A., Vorobyev, V., Wang, P., Wang, X. L., Watanabe, Y., Williams, K. M., Yabsley, B. D., Yamashita, Y., Yuan, C. Z., Zhang, Z. P., and Zhulanov, V. Mon . "First study of ηc(1S), η(1760) and X(1835) production via η'π⁺π⁻ final states in two-photon collisions". United States. doi:10.1103/PhysRevD.86.052002.
@article{osti_1103287,
title = {First study of ηc(1S), η(1760) and X(1835) production via η'π⁺π⁻ final states in two-photon collisions},
author = {Zhang, C. C. and Aihara, H. and Asner, D. M. and Aushev, T. and Bakich, A. M. and Ban, Y. and Belous, K. and Bischofberger, M. and Browder, T. E. and Chen, A. and Cheon, B. G. and Chilikin, K. and Chistov, R. and Choi, Y. and Dalseno, J. and Danilov, M. and Eidelman, S. and Feindt, M. and Gaur, V. and Gabyshev, N. and Goh, Y. M. and Han, Y. L. and Hayashii, H. and Horii, Y. and Hou, W.-S. and Hyun, H. J. and Iijima, T. and Inami, K. and Ishikawa, A. and Iwabuchi, M. and Julius, T. and Kiesling, C. and Kim, H. O. and Kim, M. J. and Kim, Y. J. and Ko, B. R. and Kodyš, P. and Korpar, S. and Krokovny, P. and Kuzmin, A. and Li, J. and Libby, J. and Liu, Y. and Liu, Z. Q. and Louvot, R. and Matvienko, D. and McOnie, S. and Mizuk, R. and Nakano, E. and Nakao, M. and Nakazawa, H. and Natkaniec, Z. and Nishida, S. and Ohshima, T. and Okuno, S. and Olsen, S. L. and Pakhlov, P. and Pakhlova, G. and Park, H. and Park, H. K. and Pestotnik, R. and Petrič, M. and Piilonen, L. E. and Röhrken, M. and Ryu, S. and Sahoo, H. and Sakai, Y. and Santel, D. and Sanuki, T. and Schneider, O. and Schwanda, C. and Sevior, M. E. and Shapkin, M. and Shebalin, V. and Shen, C. P. and Shibata, T.-A. and Shiu, J.-G. and Shwartz, B. and Smerkol, P. and Sohn, Y.-S. and Solovieva, E. and Stanič, S. and Starič, M. and Sumihama, M. and Sumiyoshi, T. and Tikhomirov, I. and Uchida, M. and Uehara, S. and Uglov, T. and Unno, Y. and Uno, S. and Varner, G. and Vinokurova, A. and Vorobyev, V. and Wang, P. and Wang, X. L. and Watanabe, Y. and Williams, K. M. and Yabsley, B. D. and Yamashita, Y. and Yuan, C. Z. and Zhang, Z. P. and Zhulanov, V.},
abstractNote = {The invariant mass spectrum of the η'π⁺π⁻ final state produced in two-photon collisions is obtained using a 673 fb⁻¹ data sample collected in the vicinity of the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e⁺e⁻ collider. We observe a clear signal of the ηc(1S) and measure its mass and width to be M(ηc(1S))=(2982.7±1.8(stat)±2.2(syst)±0.3(model)) MeV/c² and Γ(ηc(1S))=(37.8+5.8–5.3(stat)±2.8(syst)±1.4(model)) MeV/c². The third error is an uncertainty due to possible interference between the ηc(1S) and a nonresonant component. We also report the first evidence for η(1760) decay toη'π⁺π⁻; we find two solutions for its parameters, depending on the inclusion or not of the X(1835), whose existence is of marginal significance in our data. From a fit to the mass spectrum using coherent X(1835) and η(1760) resonant amplitudes, we set a 90% confidence level upper limit on the product ΓγγB(η'π⁺π⁻) for the X(1835).},
doi = {10.1103/PhysRevD.86.052002},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
number = 5,
volume = 86,
place = {United States},
year = {2012},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1103/PhysRevD.86.052002

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