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

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.

doi:10.1103/PhysRevD.86.052002

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

Journal Article · Mon Sep 10 00:00:00 EDT 2012 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.86.052002· OSTI ID:1103287

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. more »

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).

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Sponsoring Organization:: USDOE

OSTI ID:: 1103287

Journal Information:: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Journal Name: Physical Review. D, Particles, Fields, Gravitation and Cosmology Vol. 86 Journal Issue: 5; ISSN 1550-7998

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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