High-statistics study of K^0_S pair production in two-photon collisions
Abstract
We report a high-statistics measurement of the differential cross section of the process gamma gamma --> K^0_S K^0_S in the range 1.05 GeV <= W <= 4.00 GeV, where W is the center-of-mass energy of the colliding photons, using 972 fb^{-1} of data collected with the Belle detector at the KEKB asymmetric-energy e^+ e^- collider operated at and near the Upsilon-resonance region. The differential cross section is fitted by parameterized S-, D_0-, D_2-, G_0- and G_2-wave amplitudes. In the D_2 wave, the f_2(1270), a_2(1320) and f_2'(1525) are dominant and a resonance, the f_2(2200), is also present. The f_0(1710) and possibly the f_0(2500) are seen in the S wave. The mass, total width and product of the two-photon partial decay width and decay branching fraction to the K bar{K} state Gamma_{gamma gamma}B(K bar{K}) are extracted for the f_2'(1525), f_0(1710), f_2(2200) and f_0(2500). The destructive interference between the f_2(1270) and a_2(1320) is confirmed by measuring their relative phase. The parameters of the charmonium states chi_{c0} and chi_{c2} are updated. Possible contributions from the chi_{c0}(2P) and chi_{c2}(2P) states are discussed. A new upper limit for the branching fraction of the P- and CP-violating decay channel eta_c --> K^0_S K^0_S is reported. The detailed behavior of the cross section is updated and compared with QCD-based calculations.
Keywords
Cite
@article{arxiv.1307.7457,
title = {High-statistics study of K^0_S pair production in two-photon collisions},
author = {The Belle Collaboration and S. Uehara and Y. Watanabe and H. Nakazawa and I. Adachi and H. Aihara and D. M. Asner and V. Aulchenko and T. Aushev and A. M. Bakich and A. Bala and V. Bhardwaj and B. Bhuyan and A. Bondar and G. Bonvicini and A. Bozek and M. Bračko and V. Chekelian and A. Chen and P. Chen and B. G. Cheon and K. Chilikin and R. Chistov and K. Cho and V. Chobanova and S. -K. Choi and Y. Choi and D. Cinabro and J. Dalseno and J. Dingfelder and Z. Doležal and D. Dutta and S. Eidelman and D. Epifanov and H. Farhat and J. E. Fast and M. Feindt and T. Ferber and A. Frey and V. Gaur and N. Gabyshev and S. Ganguly and R. Gillard and F. Giordano and Y. M. Goh and B. Golob and J. Haba and K. Hayasaka and H. Hayashii and Y. Hoshi and W. -S. Hou and H. J. Hyun and T. Iijima and A. Ishikawa and R. Itoh and Y. Iwasaki and T. Julius and D. H. Kah and J. H. Kang and E. Kato and H. Kawai and T. Kawasaki and C. Kiesling and D. Y. Kim and H. O. Kim and J. B. Kim and J. H. Kim and Y. J. Kim and J. Klucar and B. R. Ko and P. Kodyš and S. Korpar and P. Križan and P. Krokovny and T. Kumita and A. Kuzmin and Y. -J. Kwon and S. -H. Lee and J. Li and Y. Li and C. Liu and Z. Q. Liu and D. Liventsev and P. Lukin and D. Matvienko and K. Miyabayashi and H. Miyata and R. Mizuk and A. Moll and T. Mori and N. Muramatsu and R. Mussa and Y. Nagasaka and M. Nakao and C. Ng and N. K. Nisar and S. Nishida and O. Nitoh and S. Ogawa and S. Okuno and G. Pakhlova and C. W. Park and H. Park and H. K. Park and T. K. Pedlar and R. Pestotnik and M. Petrič and L. E. Piilonen and M. Ritter and M. Röhrken and A. Rostomyan and H. Sahoo and T. Saito and Y. Sakai and S. Sandilya and L. Santelj and T. Sanuki and V. Savinov and O. Schneider and G. Schnell and C. Schwanda and R. Seidl and K. Senyo and O. Seon and M. Shapkin and C. P. Shen and T. -A. Shibata and J. -G. Shiu and B. Shwartz and A. Sibidanov and F. Simon and Y. -S. Sohn and A. Sokolov and E. Solovieva and M. Starič and M. Steder and M. Sumihama and T. Sumiyoshi and U. Tamponi and K. Tanida and G. Tatishvili and Y. Teramoto and M. Uchida and T. Uglov and Y. Unno and S. Uno and P. Urquijo and S. E. Vahsen and C. Van Hulse and G. Varner and M. N. Wagner and C. H. Wang and M. -Z. Wang and P. Wang and X. L. Wang and K. M. Williams and E. Won and Y. Yamashita and S. Yashchenko and Y. Yook and C. Z. Yuan and Y. Yusa and C. C. Zhang and Z. P. Zhang and V. Zhilich and V. Zhulanov and A. Zupanc},
journal= {arXiv preprint arXiv:1307.7457},
year = {2013}
}
Comments
35 pages, 32 figures, 17 tables