High statistics measurement of the cross sections of γγ → π +π - production

T. Mori, S. Uehara, Y. Watanabe, K. Abe, I. Adachi, H. Aihara, K. Arinstein, V. Aulchenko, T. Aushev, A. M. Bakich, V. Balagura, E. Barberio, A. Bay, K. Belous, U. Bitenc, I. Bizjak, S. Blyth, A. Bondar, M. Bračko, T. E. BrowderM. C. Chang, A. Chen, W. T. Chen, B. G. Cheon, I. S. Cho, S. K. Choi, Y. Choi, J. Dalseno, M. Dash, A. Drutskoy, S. Eidelman, S. Fratina, N. Gabyshev, B. Golob, H. Ha, K. Hayasaka, H. Hayashii, M. Hazumi, D. Heffernan, T. Hokuue, Y. Hoshi, W. S. Hou, T. Iijima, K. Ikado, A. Imoto, K. Inami, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, H. Kaji, J. H. Kang, P. Kapusta, N. Katayama, T. Kawasaki, H. Kichimi, H. O. Kim, S. K. Kim, Y. J. Kim, S. Korpar, P. Križan, P. Krokovny, R. Kumar, C. C. Kuo, A. Kuzmin, Y. J. Kwon, M. J. Lee, S. E. Lee, T. Lesiak, J. Li, A. Limosani, S. W. Lin, D. Liventsev, J. MacNaughton, F. Mandl, T. Matsumoto, A. Matyja, S. Mconie, T. Medvedeva, H. Miyake, H. Miyata, Y. Miyazaki, R. Mizuk, G. R. Moloney, Y. Nagasaka, E. Nakano, M. Nakao, H. Nakazawa, Z. Natkaniec, S. Nishida, O. Nitoh, S. Noguchi, T. Ohshima, S. Okuno, S. L. Olsen, S. Ono, Y. Onuki, W. Ostrowicz, H. Ozaki, P. Pakhlov, G. Pakhlova, C. W. Park, H. Park, K. S. Park, R. Pestotnik, L. E. Piilonen, A. Poluektov, H. Sahoo, Y. Sakai, N. Satoyama, O. Schneider, J. Schümann, K. Senyo, M. E. Sevior, M. Shapkin, C. P. Shen, H. Shibuya, B. Shwartz, J. B. Singh, A. Sokolov, A. Somov, N. Soni, S. Stanič, M. Starič, H. Stoeck, T. Sumiyoshi, S. Y. Suzuki, F. Takasaki, K. Tamai, M. Tanaka, G. N. Taylor, Y. Teramoto, X. C. Tian, I. Tikhomirov, T. Tsuboyama, T. Tsukamoto, K. Ueno, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, G. Varner, K. Vervink, S. Villa, A. Vinokurova, C. H. Wang, P. Wang, Eunil Won, Q. L. Xie, B. D. Yabsley, A. Yamaguchi, Y. Yamashita, C. C. Zhang, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

We report on a high statistics measurement of the total and differential cross sections of the process γγ → π +π - in the π +π - invariant mass range 0.8 GeV/c 2 < W < 1.5 GeV/c 2 with 85.9 fb -1 of data collected at √s = 10.58 GeV and 10.52 GeV with the Belle detector. A clear signal of the f 0(980) resonance is observed in addition to the f 2(1270) resonance. An improved 90% confidence level upper limit ℬ(η′(958) → π +π - < 2.9 × 10 -3 is obtained for P- and CP-violating decay of the η′(958) meson using the most conservative assumption about the interference with the background.

Original languageEnglish
Article number074102
JournalJournal of the Physical Society of Japan
Volume76
Issue number7
DOIs
Publication statusPublished - 2007 Jul 1

Fingerprint

statistics
cross sections
confidence
mesons
interference
detectors
decay

Keywords

  • γγ → π π cross section
  • η′(958)
  • F (980), f (1270)
  • Two-photon production

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Mori, T., Uehara, S., Watanabe, Y., Abe, K., Adachi, I., Aihara, H., ... Zupanc, A. (2007). High statistics measurement of the cross sections of γγ → π +π - production. Journal of the Physical Society of Japan, 76(7), [074102]. https://doi.org/10.1143/JPSJ.76.074102

High statistics measurement of the cross sections of γγ → π +π - production. / Mori, T.; Uehara, S.; Watanabe, Y.; Abe, K.; Adachi, I.; Aihara, H.; Arinstein, K.; Aulchenko, V.; Aushev, T.; Bakich, A. M.; Balagura, V.; Barberio, E.; Bay, A.; Belous, K.; Bitenc, U.; Bizjak, I.; Blyth, S.; Bondar, A.; Bračko, M.; Browder, T. E.; Chang, M. C.; Chen, A.; Chen, W. T.; Cheon, B. G.; Cho, I. S.; Choi, S. K.; Choi, Y.; Dalseno, J.; Dash, M.; Drutskoy, A.; Eidelman, S.; Fratina, S.; Gabyshev, N.; Golob, B.; Ha, H.; Hayasaka, K.; Hayashii, H.; Hazumi, M.; Heffernan, D.; Hokuue, T.; Hoshi, Y.; Hou, W. S.; Iijima, T.; Ikado, K.; Imoto, A.; Inami, K.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Kaji, H.; Kang, J. H.; Kapusta, P.; Katayama, N.; Kawasaki, T.; Kichimi, H.; Kim, H. O.; Kim, S. K.; Kim, Y. J.; Korpar, S.; Križan, P.; Krokovny, P.; Kumar, R.; Kuo, C. C.; Kuzmin, A.; Kwon, Y. J.; Lee, M. J.; Lee, S. E.; Lesiak, T.; Li, J.; Limosani, A.; Lin, S. W.; Liventsev, D.; MacNaughton, J.; Mandl, F.; Matsumoto, T.; Matyja, A.; Mconie, S.; Medvedeva, T.; Miyake, H.; Miyata, H.; Miyazaki, Y.; Mizuk, R.; Moloney, G. R.; Nagasaka, Y.; Nakano, E.; Nakao, M.; Nakazawa, H.; Natkaniec, Z.; Nishida, S.; Nitoh, O.; Noguchi, S.; Ohshima, T.; Okuno, S.; Olsen, S. L.; Ono, S.; Onuki, Y.; Ostrowicz, W.; Ozaki, H.; Pakhlov, P.; Pakhlova, G.; Park, C. W.; Park, H.; Park, K. S.; Pestotnik, R.; Piilonen, L. E.; Poluektov, A.; Sahoo, H.; Sakai, Y.; Satoyama, N.; Schneider, O.; Schümann, J.; Senyo, K.; Sevior, M. E.; Shapkin, M.; Shen, C. P.; Shibuya, H.; Shwartz, B.; Singh, J. B.; Sokolov, A.; Somov, A.; Soni, N.; Stanič, S.; Starič, M.; Stoeck, H.; Sumiyoshi, T.; Suzuki, S. Y.; Takasaki, F.; Tamai, K.; Tanaka, M.; Taylor, G. N.; Teramoto, Y.; Tian, X. C.; Tikhomirov, I.; Tsuboyama, T.; Tsukamoto, T.; Ueno, K.; Uglov, T.; Unno, Y.; Uno, S.; Urquijo, P.; Usov, Y.; Varner, G.; Vervink, K.; Villa, S.; Vinokurova, A.; Wang, C. H.; Wang, P.; Won, Eunil; Xie, Q. L.; Yabsley, B. D.; Yamaguchi, A.; Yamashita, Y.; Zhang, C. C.; Zhang, Z. P.; Zhilich, V.; Zhulanov, V.; Zupanc, A.

In: Journal of the Physical Society of Japan, Vol. 76, No. 7, 074102, 01.07.2007.

Research output: Contribution to journalArticle

Mori, T, Uehara, S, Watanabe, Y, Abe, K, Adachi, I, Aihara, H, Arinstein, K, Aulchenko, V, Aushev, T, Bakich, AM, Balagura, V, Barberio, E, Bay, A, Belous, K, Bitenc, U, Bizjak, I, Blyth, S, Bondar, A, Bračko, M, Browder, TE, Chang, MC, Chen, A, Chen, WT, Cheon, BG, Cho, IS, Choi, SK, Choi, Y, Dalseno, J, Dash, M, Drutskoy, A, Eidelman, S, Fratina, S, Gabyshev, N, Golob, B, Ha, H, Hayasaka, K, Hayashii, H, Hazumi, M, Heffernan, D, Hokuue, T, Hoshi, Y, Hou, WS, Iijima, T, Ikado, K, Imoto, A, Inami, K, Ishikawa, A, Itoh, R, Iwasaki, M, Iwasaki, Y, Kaji, H, Kang, JH, Kapusta, P, Katayama, N, Kawasaki, T, Kichimi, H, Kim, HO, Kim, SK, Kim, YJ, Korpar, S, Križan, P, Krokovny, P, Kumar, R, Kuo, CC, Kuzmin, A, Kwon, YJ, Lee, MJ, Lee, SE, Lesiak, T, Li, J, Limosani, A, Lin, SW, Liventsev, D, MacNaughton, J, Mandl, F, Matsumoto, T, Matyja, A, Mconie, S, Medvedeva, T, Miyake, H, Miyata, H, Miyazaki, Y, Mizuk, R, Moloney, GR, Nagasaka, Y, Nakano, E, Nakao, M, Nakazawa, H, Natkaniec, Z, Nishida, S, Nitoh, O, Noguchi, S, Ohshima, T, Okuno, S, Olsen, SL, Ono, S, Onuki, Y, Ostrowicz, W, Ozaki, H, Pakhlov, P, Pakhlova, G, Park, CW, Park, H, Park, KS, Pestotnik, R, Piilonen, LE, Poluektov, A, Sahoo, H, Sakai, Y, Satoyama, N, Schneider, O, Schümann, J, Senyo, K, Sevior, ME, Shapkin, M, Shen, CP, Shibuya, H, Shwartz, B, Singh, JB, Sokolov, A, Somov, A, Soni, N, Stanič, S, Starič, M, Stoeck, H, Sumiyoshi, T, Suzuki, SY, Takasaki, F, Tamai, K, Tanaka, M, Taylor, GN, Teramoto, Y, Tian, XC, Tikhomirov, I, Tsuboyama, T, Tsukamoto, T, Ueno, K, Uglov, T, Unno, Y, Uno, S, Urquijo, P, Usov, Y, Varner, G, Vervink, K, Villa, S, Vinokurova, A, Wang, CH, Wang, P, Won, E, Xie, QL, Yabsley, BD, Yamaguchi, A, Yamashita, Y, Zhang, CC, Zhang, ZP, Zhilich, V, Zhulanov, V & Zupanc, A 2007, 'High statistics measurement of the cross sections of γγ → π +π - production', Journal of the Physical Society of Japan, vol. 76, no. 7, 074102. https://doi.org/10.1143/JPSJ.76.074102
Mori, T. ; Uehara, S. ; Watanabe, Y. ; Abe, K. ; Adachi, I. ; Aihara, H. ; Arinstein, K. ; Aulchenko, V. ; Aushev, T. ; Bakich, A. M. ; Balagura, V. ; Barberio, E. ; Bay, A. ; Belous, K. ; Bitenc, U. ; Bizjak, I. ; Blyth, S. ; Bondar, A. ; Bračko, M. ; Browder, T. E. ; Chang, M. C. ; Chen, A. ; Chen, W. T. ; Cheon, B. G. ; Cho, I. S. ; Choi, S. K. ; Choi, Y. ; Dalseno, J. ; Dash, M. ; Drutskoy, A. ; Eidelman, S. ; Fratina, S. ; Gabyshev, N. ; Golob, B. ; Ha, H. ; Hayasaka, K. ; Hayashii, H. ; Hazumi, M. ; Heffernan, D. ; Hokuue, T. ; Hoshi, Y. ; Hou, W. S. ; Iijima, T. ; Ikado, K. ; Imoto, A. ; Inami, K. ; Ishikawa, A. ; Itoh, R. ; Iwasaki, M. ; Iwasaki, Y. ; Kaji, H. ; Kang, J. H. ; Kapusta, P. ; Katayama, N. ; Kawasaki, T. ; Kichimi, H. ; Kim, H. O. ; Kim, S. K. ; Kim, Y. J. ; Korpar, S. ; Križan, P. ; Krokovny, P. ; Kumar, R. ; Kuo, C. C. ; Kuzmin, A. ; Kwon, Y. J. ; Lee, M. J. ; Lee, S. E. ; Lesiak, T. ; Li, J. ; Limosani, A. ; Lin, S. W. ; Liventsev, D. ; MacNaughton, J. ; Mandl, F. ; Matsumoto, T. ; Matyja, A. ; Mconie, S. ; Medvedeva, T. ; Miyake, H. ; Miyata, H. ; Miyazaki, Y. ; Mizuk, R. ; Moloney, G. R. ; Nagasaka, Y. ; Nakano, E. ; Nakao, M. ; Nakazawa, H. ; Natkaniec, Z. ; Nishida, S. ; Nitoh, O. ; Noguchi, S. ; Ohshima, T. ; Okuno, S. ; Olsen, S. L. ; Ono, S. ; Onuki, Y. ; Ostrowicz, W. ; Ozaki, H. ; Pakhlov, P. ; Pakhlova, G. ; Park, C. W. ; Park, H. ; Park, K. S. ; Pestotnik, R. ; Piilonen, L. E. ; Poluektov, A. ; Sahoo, H. ; Sakai, Y. ; Satoyama, N. ; Schneider, O. ; Schümann, J. ; Senyo, K. ; Sevior, M. E. ; Shapkin, M. ; Shen, C. P. ; Shibuya, H. ; Shwartz, B. ; Singh, J. B. ; Sokolov, A. ; Somov, A. ; Soni, N. ; Stanič, S. ; Starič, M. ; Stoeck, H. ; Sumiyoshi, T. ; Suzuki, S. Y. ; Takasaki, F. ; Tamai, K. ; Tanaka, M. ; Taylor, G. N. ; Teramoto, Y. ; Tian, X. C. ; Tikhomirov, I. ; Tsuboyama, T. ; Tsukamoto, T. ; Ueno, K. ; Uglov, T. ; Unno, Y. ; Uno, S. ; Urquijo, P. ; Usov, Y. ; Varner, G. ; Vervink, K. ; Villa, S. ; Vinokurova, A. ; Wang, C. H. ; Wang, P. ; Won, Eunil ; Xie, Q. L. ; Yabsley, B. D. ; Yamaguchi, A. ; Yamashita, Y. ; Zhang, C. C. ; Zhang, Z. P. ; Zhilich, V. ; Zhulanov, V. ; Zupanc, A. / High statistics measurement of the cross sections of γγ → π +π - production. In: Journal of the Physical Society of Japan. 2007 ; Vol. 76, No. 7.
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title = "High statistics measurement of the cross sections of γγ → π +π - production",
abstract = "We report on a high statistics measurement of the total and differential cross sections of the process γγ → π +π - in the π +π - invariant mass range 0.8 GeV/c 2 < W < 1.5 GeV/c 2 with 85.9 fb -1 of data collected at √s = 10.58 GeV and 10.52 GeV with the Belle detector. A clear signal of the f 0(980) resonance is observed in addition to the f 2(1270) resonance. An improved 90{\%} confidence level upper limit ℬ(η′(958) → π +π - < 2.9 × 10 -3 is obtained for P- and CP-violating decay of the η′(958) meson using the most conservative assumption about the interference with the background.",
keywords = "γγ → π π cross section, η′(958), F (980), f (1270), Two-photon production",
author = "T. Mori and S. Uehara and Y. Watanabe and K. Abe and I. Adachi and H. Aihara and K. Arinstein and V. Aulchenko and T. Aushev and Bakich, {A. M.} and V. Balagura and E. Barberio and A. Bay and K. Belous and U. Bitenc and I. Bizjak and S. Blyth and A. Bondar and M. Bračko and Browder, {T. E.} and Chang, {M. C.} and A. Chen and Chen, {W. T.} and Cheon, {B. G.} and Cho, {I. S.} and Choi, {S. K.} and Y. Choi and J. Dalseno and M. Dash and A. Drutskoy and S. Eidelman and S. Fratina and N. Gabyshev and B. Golob and H. Ha and K. Hayasaka and H. Hayashii and M. Hazumi and D. Heffernan and T. Hokuue and Y. Hoshi and Hou, {W. S.} and T. Iijima and K. Ikado and A. Imoto and K. Inami and A. Ishikawa and R. Itoh and M. Iwasaki and Y. Iwasaki and H. Kaji and Kang, {J. H.} and P. Kapusta and N. Katayama and T. Kawasaki and H. Kichimi and Kim, {H. O.} and Kim, {S. K.} and Kim, {Y. J.} and S. Korpar and P. Križan and P. Krokovny and R. Kumar and Kuo, {C. C.} and A. Kuzmin and Kwon, {Y. J.} and Lee, {M. J.} and Lee, {S. E.} and T. Lesiak and J. Li and A. Limosani and Lin, {S. W.} and D. Liventsev and J. MacNaughton and F. Mandl and T. Matsumoto and A. Matyja and S. Mconie and T. Medvedeva and H. Miyake and H. Miyata and Y. Miyazaki and R. Mizuk and Moloney, {G. R.} and Y. Nagasaka and E. Nakano and M. Nakao and H. Nakazawa and Z. Natkaniec and S. Nishida and O. Nitoh and S. Noguchi and T. Ohshima and S. Okuno and Olsen, {S. L.} and S. Ono and Y. Onuki and W. Ostrowicz and H. Ozaki and P. Pakhlov and G. Pakhlova and Park, {C. W.} and H. Park and Park, {K. S.} and R. Pestotnik and Piilonen, {L. E.} and A. Poluektov and H. Sahoo and Y. Sakai and N. Satoyama and O. Schneider and J. Sch{\"u}mann and K. Senyo and Sevior, {M. E.} and M. Shapkin and Shen, {C. P.} and H. Shibuya and B. Shwartz and Singh, {J. B.} and A. Sokolov and A. Somov and N. Soni and S. Stanič and M. Starič and H. Stoeck and T. Sumiyoshi and Suzuki, {S. Y.} and F. Takasaki and K. Tamai and M. Tanaka and Taylor, {G. N.} and Y. Teramoto and Tian, {X. C.} and I. Tikhomirov and T. Tsuboyama and T. Tsukamoto and K. Ueno and T. Uglov and Y. Unno and S. Uno and P. Urquijo and Y. Usov and G. Varner and K. Vervink and S. Villa and A. Vinokurova and Wang, {C. H.} and P. Wang and Eunil Won and Xie, {Q. L.} and Yabsley, {B. D.} and A. Yamaguchi and Y. Yamashita and Zhang, {C. C.} and Zhang, {Z. P.} and V. Zhilich and V. Zhulanov and A. Zupanc",
year = "2007",
month = "7",
day = "1",
doi = "10.1143/JPSJ.76.074102",
language = "English",
volume = "76",
journal = "Journal of the Physical Society of Japan",
issn = "0031-9015",
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TY - JOUR

T1 - High statistics measurement of the cross sections of γγ → π +π - production

AU - Mori, T.

AU - Uehara, S.

AU - Watanabe, Y.

AU - Abe, K.

AU - Adachi, I.

AU - Aihara, H.

AU - Arinstein, K.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Bakich, A. M.

AU - Balagura, V.

AU - Barberio, E.

AU - Bay, A.

AU - Belous, K.

AU - Bitenc, U.

AU - Bizjak, I.

AU - Blyth, S.

AU - Bondar, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Chang, M. C.

AU - Chen, A.

AU - Chen, W. T.

AU - Cheon, B. G.

AU - Cho, I. S.

AU - Choi, S. K.

AU - Choi, Y.

AU - Dalseno, J.

AU - Dash, M.

AU - Drutskoy, A.

AU - Eidelman, S.

AU - Fratina, S.

AU - Gabyshev, N.

AU - Golob, B.

AU - Ha, H.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Hazumi, M.

AU - Heffernan, D.

AU - Hokuue, T.

AU - Hoshi, Y.

AU - Hou, W. S.

AU - Iijima, T.

AU - Ikado, K.

AU - Imoto, A.

AU - Inami, K.

AU - Ishikawa, A.

AU - Itoh, R.

AU - Iwasaki, M.

AU - Iwasaki, Y.

AU - Kaji, H.

AU - Kang, J. H.

AU - Kapusta, P.

AU - Katayama, N.

AU - Kawasaki, T.

AU - Kichimi, H.

AU - Kim, H. O.

AU - Kim, S. K.

AU - Kim, Y. J.

AU - Korpar, S.

AU - Križan, P.

AU - Krokovny, P.

AU - Kumar, R.

AU - Kuo, C. C.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Lee, M. J.

AU - Lee, S. E.

AU - Lesiak, T.

AU - Li, J.

AU - Limosani, A.

AU - Lin, S. W.

AU - Liventsev, D.

AU - MacNaughton, J.

AU - Mandl, F.

AU - Matsumoto, T.

AU - Matyja, A.

AU - Mconie, S.

AU - Medvedeva, T.

AU - Miyake, H.

AU - Miyata, H.

AU - Miyazaki, Y.

AU - Mizuk, R.

AU - Moloney, G. R.

AU - Nagasaka, Y.

AU - Nakano, E.

AU - Nakao, M.

AU - Nakazawa, H.

AU - Natkaniec, Z.

AU - Nishida, S.

AU - Nitoh, O.

AU - Noguchi, S.

AU - Ohshima, T.

AU - Okuno, S.

AU - Olsen, S. L.

AU - Ono, S.

AU - Onuki, Y.

AU - Ostrowicz, W.

AU - Ozaki, H.

AU - Pakhlov, P.

AU - Pakhlova, G.

AU - Park, C. W.

AU - Park, H.

AU - Park, K. S.

AU - Pestotnik, R.

AU - Piilonen, L. E.

AU - Poluektov, A.

AU - Sahoo, H.

AU - Sakai, Y.

AU - Satoyama, N.

AU - Schneider, O.

AU - Schümann, J.

AU - Senyo, K.

AU - Sevior, M. E.

AU - Shapkin, M.

AU - Shen, C. P.

AU - Shibuya, H.

AU - Shwartz, B.

AU - Singh, J. B.

AU - Sokolov, A.

AU - Somov, A.

AU - Soni, N.

AU - Stanič, S.

AU - Starič, M.

AU - Stoeck, H.

AU - Sumiyoshi, T.

AU - Suzuki, S. Y.

AU - Takasaki, F.

AU - Tamai, K.

AU - Tanaka, M.

AU - Taylor, G. N.

AU - Teramoto, Y.

AU - Tian, X. C.

AU - Tikhomirov, I.

AU - Tsuboyama, T.

AU - Tsukamoto, T.

AU - Ueno, K.

AU - Uglov, T.

AU - Unno, Y.

AU - Uno, S.

AU - Urquijo, P.

AU - Usov, Y.

AU - Varner, G.

AU - Vervink, K.

AU - Villa, S.

AU - Vinokurova, A.

AU - Wang, C. H.

AU - Wang, P.

AU - Won, Eunil

AU - Xie, Q. L.

AU - Yabsley, B. D.

AU - Yamaguchi, A.

AU - Yamashita, Y.

AU - Zhang, C. C.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zhulanov, V.

AU - Zupanc, A.

PY - 2007/7/1

Y1 - 2007/7/1

N2 - We report on a high statistics measurement of the total and differential cross sections of the process γγ → π +π - in the π +π - invariant mass range 0.8 GeV/c 2 < W < 1.5 GeV/c 2 with 85.9 fb -1 of data collected at √s = 10.58 GeV and 10.52 GeV with the Belle detector. A clear signal of the f 0(980) resonance is observed in addition to the f 2(1270) resonance. An improved 90% confidence level upper limit ℬ(η′(958) → π +π - < 2.9 × 10 -3 is obtained for P- and CP-violating decay of the η′(958) meson using the most conservative assumption about the interference with the background.

AB - We report on a high statistics measurement of the total and differential cross sections of the process γγ → π +π - in the π +π - invariant mass range 0.8 GeV/c 2 < W < 1.5 GeV/c 2 with 85.9 fb -1 of data collected at √s = 10.58 GeV and 10.52 GeV with the Belle detector. A clear signal of the f 0(980) resonance is observed in addition to the f 2(1270) resonance. An improved 90% confidence level upper limit ℬ(η′(958) → π +π - < 2.9 × 10 -3 is obtained for P- and CP-violating decay of the η′(958) meson using the most conservative assumption about the interference with the background.

KW - γγ → π π cross section

KW - η′(958)

KW - F (980), f (1270)

KW - Two-photon production

UR - http://www.scopus.com/inward/record.url?scp=34547428596&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34547428596&partnerID=8YFLogxK

U2 - 10.1143/JPSJ.76.074102

DO - 10.1143/JPSJ.76.074102

M3 - Article

AN - SCOPUS:34547428596

VL - 76

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

IS - 7

M1 - 074102

ER -