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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 (+140 others)
2005 Physics Letters B  

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2004 accepted arXiv:hep-ex/0412058v2 fatcat:73jxv6aq2nharjvpagtsmxwqji

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2004 pre-print
arXiv:hep-ex/0412058v1 fatcat:q7ljihhnizdgbkntovmgror4wu
We have measured pi+pi- and K+K- production in two-photon collisions using 87.7 /fb 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 2.4 GeV < W < 4.1 GeV and angular region |cos theta^*| < 0.6. The cross section ratio sigma(gammagamma->K+K-)/sigma(gammagamma->pi+pi-) is measured to be 0.89 +- 0.04(stat) +- 0.15(syst) in the range of 3.0 GeV < W < 4.1
more » ... GeV, where the ratio is energy independent. We observe a sin^-4 theta^* behavior of the cross section in the same W range. Production of chi_c0 and chi_c2 mesons is observed in both gammagamma -> pi+pi- and gammagamma -> K+K- modes.
doi:10.1016/j.physletb.2005.03.067 fatcat:dlxo6yuqdjhidpehpkwznmopqi
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Citation

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. Bračko, J. 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. "Measurement of the γγ→π+π− and γγ→K+K− processes at energies of 2.4–4.1 GeV." Physics Letters B 615.1-2 (2005) 39-49