High-statistics study of neutral-pion pair production in two-photon collisions
Uehara, S.; Watanabe, Y.; Nakazawa, H.; Aihara, H.; Arinstein, K.; Aulchenko, V.; Bakich, A.; Barberio, E.; Belous, K.; Bhardwaj, V.; Bondar, A.; Bozek, A.; Bračko, M.; Browder, T.; Chen, A.; Cheon, B.; Chistov, R.; Cho, I.-S.; Choi, S.-K.; Choi, Y.; Dash, M.; Eidelman, S.; Epifanov, D.; Gabyshev, N.; Goldenzweig, P.; Ha, H.; Haba, J.; Han, B.-Y.; Hayasaka, K.; Hayashii, H.; Hazumi, M.; Hoshi, Y.; Hou, W.-S.; Hyun, H.; Inami, K.; Ishikawa, A.; Iwasaki, Y.; Joshi, N.; Kah, D.; Katayama, N.; Kawasaki, T.; Kichimi, H.; Kim, H.; Kim, Y.; Kim, Y.; Korpar, S.; Križan, P.; Krokovny, P.; Kuzmin, A.; Kwon, Y.-J.; Lee, M.; Lesiak, T.; Liu, Y.; Liventsev, D.; Louvot, R.; Mconie, S.; Miyata, H.; Mizuk, R.; Nagasaka, Y.; Nakao, M.; Nishida, S.; Nishimura, K.; Nitoh, O.; Ogawa, S.; Ohshima, T.; Okuno, S.; Pakhlov, P.; Pakhlova, G.; Park, C.; Park, H.; Park, H.; Pestotnik, R.; Piilonen, L.; Poluektov, A.; Sahoo, H.; Sakai, Y.; Schneider, O.; Senyo, K.; Shapkin, M.; Shiu, J.-G.; Shwartz, B.; Starič, M.; Sumiyoshi, T.; Tanaka, M.; Teramoto, Y.; Tikhomirov, I.; Uglov, T.; Unno, Y.; Uno, S.; Usov, Y.; Varner, G.; Vervink, K.; Vinokurova, A.; Wang, C.; Wang, P.; Yabsley, B.; Yamashita, Y.; Zhang, C.; Zhang, Z.; Zhilich, V.; Zhulanov, V.; Zivko, T.; Zupanc, A.; Zyukova, O.; Belle Collaboration
2009

Abstract

The differential cross sections for the process gamma gamma -> pi(0)pi(0) have been measured in the kinematic range 0.6 GeV < W < 4.1 GeV, vertical bar cos theta* vertical bar < 0.8 in energy and pion scattering angle, respectively, in the gamma gamma center-of-mass system. The results are based on a 223 fb(-1) data sample collected with the Belle detector at the KEKB e(+)e(-) collider. The differential cross sections are fitted in the energy region 1.7 GeV < W < 2.5 GeV to confirm the two-photon production of two pions in the G wave. In the higher-energy region, we observe production of the chi(c0) charmonium state and obtain the product of its two-photon decay width and branching fraction to pi(0)pi(0). We also compare the observed angular dependence and ratios of cross sections for neutral-pion and charged-pion pair production to QCD models. The energy and angular dependence above 3.1 GeV are compatible with those measured in the pi(+)pi(-) channel, and in addition we find that the cross section ratio, sigma(pi(0)pi(0))/sigma(pi(+)pi(-)), is 0.32 +/- 0.03 +/- 0.05 on average in the 3.1-4.1 GeV region.

Details

Title High-statistics study of neutral-pion pair production in two-photon collisions
Author(s) Uehara, S. ; Watanabe, Y. ; Nakazawa, H. ; Aihara, H. ; Arinstein, K. ; Aulchenko, V. ; Bakich, A. ; Barberio, E. ; Belous, K. ; Bhardwaj, V. ; Bondar, A. ; Bozek, A. ; Bračko, M. ; Browder, T. ; Chen, A. ; Cheon, B. ; Chistov, R. ; Cho, I.-S. ; Choi, S.-K. ; Choi, Y. ; Dash, M. ; Eidelman, S. ; Epifanov, D. ; Gabyshev, N. ; Goldenzweig, P. ; Ha, H. ; Haba, J. ; Han, B.-Y. ; Hayasaka, K. ; Hayashii, H. ; Hazumi, M. ; Hoshi, Y. ; Hou, W.-S. ; Hyun, H. ; Inami, K. ; Ishikawa, A. ; Iwasaki, Y. ; Joshi, N. ; Kah, D. ; Katayama, N. ; Kawasaki, T. ; Kichimi, H. ; Kim, H. ; Kim, Y. ; Kim, Y. ; Korpar, S. ; Križan, P. ; Krokovny, P. ; Kuzmin, A. ; Kwon, Y.-J. ; Lee, M. ; Lesiak, T. ; Liu, Y. ; Liventsev, D. ; Louvot, R. ; Mconie, S. ; Miyata, H. ; Mizuk, R. ; Nagasaka, Y. ; Nakao, M. ; Nishida, S. ; Nishimura, K. ; Nitoh, O. ; Ogawa, S. ; Ohshima, T. ; Okuno, S. ; Pakhlov, P. ; Pakhlova, G. ; Park, C. ; Park, H. ; Park, H. ; Pestotnik, R. ; Piilonen, L. ; Poluektov, A. ; Sahoo, H. ; Sakai, Y. ; Schneider, O. ; Senyo, K. ; Shapkin, M. ; Shiu, J.-G. ; Shwartz, B. ; Starič, M. ; Sumiyoshi, T. ; Tanaka, M. ; Teramoto, Y. ; Tikhomirov, I. ; Uglov, T. ; Unno, Y. ; Uno, S. ; Usov, Y. ; Varner, G. ; Vervink, K. ; Vinokurova, A. ; Wang, C. ; Wang, P. ; Yabsley, B. ; Yamashita, Y. ; Zhang, C. ; Zhang, Z. ; Zhilich, V. ; Zhulanov, V. ; Zivko, T. ; Zupanc, A. ; Zyukova, O. ; Belle Collaboration
Published in Physical Review D
Volume 79
Issue 5
Pages 052009
Date 2009
ISSN 1550-2368
Keywords
DOI https://doi.org/10.1103/PhysRevD.79.052009
Other identifier(s) View record in Web of Science
Laboratories LPHE
Record Appears in Scientific production and competences > SB - School of Basic Sciences > IPHYS - Institute of Physics > LPHE - High Energy Physics Laboratory
Peer-reviewed publications
Work produced at EPFL
Journal Articles
Published
Record creation date 2010-11-05

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