Measurement of the γγ → π+π- and γγ → K+K- processes at energies of 2.4-4.1 GeV

H. Nakazawa, S. Uehara, K. Abe, K. Abe, H. Aihara, M. Akatsu, Y. Asano, V. Aulchenko, T. Aushev, S. Bahinipati, A. M. Bakich, Y. Ban, S. Banerjee, I. Bedny, U. Bitenc, I. Bizjak, S. Blyth, A. Bondar, A. Bozek, M. BračkoJ. Brodzicka, A. Chen, B. G. Cheon, R. Chistov, Y. Choi, Y. K. Choi, A. Chuvikov, J. Dalseno, M. Danilov, M. Dash, A. Drutskoy, S. Eidelman, Y. Enari, D. Epifanov, S. Fratina, N. Gabyshev, A. Garmash, T. Gershon, G. Gokhroo, K. Hayasaka, H. Hayashii, Y. Hoshi, S. Hou, W. S. Hou, T. Iijima, A. Imoto, K. Inami, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, J. H. Kang, J. S. Kang, S. U. Kataoka, N. Katayama, H. Kawai, T. Kawasaki, H. R. Khan, H. Kichimi, H. J. Kim, J. H. Kim, S. K. Kim, S. M. Kim, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, C. C. Kuo, A. Kuzmin, Y. J. Kwon, G. Leder, S. E. Lee, T. Lesiak, J. Li, S. W. Lin, D. Liventsev, G. Majumder, F. Mandl, T. Matsumoto, A. Matyja, W. Mitaroff, H. Miyake, H. Miyata, R. Mizuk, D. Mohapatra, T. Mori, T. Nagamine, Y. Nagasaka, E. Nakano, M. Nakao, Z. Natkaniec, S. Nishida, O. Nitoh, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, W. Ostrowicz, P. Pakhlov, H. Palka, C. W. Park, H. Park, N. Parslow, L. S. Peak, R. Pestotnik, L. E. Piilonen, H. Sagawa, Y. Sakai, N. Sato, T. Schietinger, O. Schneider, J. Schümann, K. Senyo, H. Shibuya, B. Shwartz, J. B. Singh, A. Somov, N. Soni, R. Stamen, S. Stanič, M. Starič, K. Sumisawa, T. Sumiyoshi, S. Y. Suzuki, O. Tajima, F. Takasaki, N. Tamura, M. Tanaka, Y. Teramoto, X. C. Tian, T. Tsuboyama, T. Tsukamoto, T. Uglov, S. Uno, G. Varner, S. Villa, C. C. Wang, C. H. Wang, M. Watanabe, Y. Watanabe, B. D. Yabsley, A. Yamaguchi, Y. Yamashita, M. Yamauchi, J. Ying, Y. Yusa, L. M. Zhang, Z. P. Zhang, V. Zhilich, D. Žontar

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

We have measured π+π- and K+K - production in two-photon collisions using 87.7fb-1 of data collected with the Belle detector at the asymmetric energy e +e- collider KEKB. The cross sections are measured to high precision in the two-photon center-of-mass energy (W) range between 2.4GeV<W<4.1GeV and angular region |cosθ*|<0.6. The cross section ratio σ(γγ→K+K-)/ σ(γγ→π+π-) is measured to be 0.89±0.04(stat.)±0.15(syst.) in the range of 3.0GeV<W<4. 1GeV, where the ratio is energy-independent. We observe a sin -4θ* behavior of the cross section in the same W range. Production of χc0 and χc2 mesons is observed in both γγ→π+π- and γγ→K+K- modes.

Original languageEnglish
Pages (from-to)39-49
Number of pages11
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume615
Issue number1-2
DOIs
Publication statusPublished - May 26 2005

Keywords

  • Charmonium
  • Mesons
  • QCD
  • Two-photon collisions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Nakazawa, H., Uehara, S., Abe, K., Abe, K., Aihara, H., Akatsu, M., Asano, Y., Aulchenko, V., Aushev, T., Bahinipati, S., Bakich, A. M., Ban, Y., Banerjee, S., Bedny, I., Bitenc, U., Bizjak, I., Blyth, S., Bondar, A., Bozek, A., ... Žontar, D. (2005). Measurement of the γγ → π+π- and γγ → K+K- processes at energies of 2.4-4.1 GeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 615(1-2), 39-49. https://doi.org/10.1016/j.physletb.2005.03.067