@article{9bee48b5ae774f04b854a99d949ab13f,
title = "First observation of γγ →p p K+K- and search for exotic baryons in pK systems",
abstract = "The process γγ→ppK+K- and its intermediate processes are measured for the first time using a 980 fb-1 data sample collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The production of ppK+K- and a Λ(1520)0 (Λ(1520)0) signal in the pK- (pK+) invariant mass spectrum are clearly observed. However, no evidence for an exotic baryon near 1540 MeV/c2, denoted as Θ(1540)0 (Θ(1540)0) or Θ(1540)++ (Θ(1540) - ), is seen in the pK- (pK+) or pK+ (pK-) invariant mass spectra. Cross sections for γγ→ppK+K-, Λ(1520)0pK++c.c. and the products σ(γγ→Θ(1540)0pK++c.c.)B(Θ(1540)0→pK-) and σ(γγ→Θ(1540)++pK-+c.c.)B(Θ(1540)++→pK+) are measured. We also determine upper limits on the products of the χc0 and χc2 two-photon decay widths and their branching fractions to ppK+K- at the 90% credibility level.",
author = "{(Belle Collaboration)} and Shen, {C. P.} and Yuan, {C. Z.} and I. Adachi and H. Aihara and Asner, {D. M.} and V. Aulchenko and T. Aushev and R. Ayad and V. Babu and I. Badhrees and Bakich, {A. M.} and E. Barberio and P. Behera and V. Bhardwaj and B. Bhuyan and J. Biswal and A. Bobrov and G. Bonvicini and A. Bozek and M. Bra{\v c}ko and Browder, {T. E.} and D. {\v C}ervenkov and P. Chang and V. Chekelian and A. Chen and Cheon, {B. G.} and K. Chilikin and R. Chistov and K. Cho and V. Chobanova and Choi, {S. K.} and Y. Choi and D. Cinabro and J. Dalseno and M. Danilov and N. Dash and Z. Dole{\v Z}al and Z. Dr{\'a}sal and D. Dutta and S. Eidelman and Fang, {W. X.} and Fast, {J. E.} and T. Ferber and Fulsom, {B. G.} and V. Gaur and N. Gabyshev and A. Garmash and R. Gillard and R. Glattauer and P. Goldenzweig and O. Grzymkowska and J. Haba and K. Hayasaka and H. Hayashii and Hou, {W. S.} and T. Iijima and K. Inami and G. Inguglia and A. Ishikawa and R. Itoh and Y. Iwasaki and I. Jaegle and Jeon, {H. B.} and Joo, {K. K.} and T. Julius and Kang, {K. H.} and E. Kato and C. Kiesling and Kim, {D. Y.} and Kim, {J. B.} and Kim, {K. T.} and Kim, {S. H.} and Kim, {Y. J.} and P. Kody{\v s} and S. Korpar and D. Kotchetkov and P. Kri{\v Z}an and P. Krokovny and A. Kuzmin and Kwon, {Y. J.} and Lange, {J. S.} and Li, {C. H.} and H. Li and L. Li and Y. Li and {Li Gioi}, L. and J. Libby and D. Liventsev and M. Lubej and T. Luo and M. Masuda and T. Matsuda and D. Matvienko and K. Miyabayashi and H. Miyata and R. Mizuk and Mohanty, {G. B.} and S. Mohanty and A. Moll and Moon, {H. K.} and R. Mussa and E. Nakano and M. Nakao and T. Nanut and Nath, {K. J.} and Z. Natkaniec and S. Nishida and S. Ogawa and Olsen, {S. L.} and W. Ostrowicz and P. Pakhlov and G. Pakhlova and B. Pal and Park, {C. S.} and H. Park and L. Pes{\'a}ntez and R. Pestotnik and M. Petri{\v c} and Piilonen, {L. E.} and C. Pulvermacher and J. Rauch and M. Ritter and Y. Sakai and S. Sandilya and L. Santelj and T. Sanuki and V. Savinov and T. Schl{\"u}ter and O. Schneider and G. Schnell and C. Schwanda and Y. Seino and D. Semmler and K. Senyo and Seong, {I. S.} and Sevior, {M. E.} and Shibata, {T. A.} and Shiu, {J. G.} and B. Shwartz and F. Simon and A. Sokolov and E. Solovieva and S. Stani{\v c} and M. Stari{\v c} and Strube, {J. F.} and J. Stypula and M. Sumihama and T. Sumiyoshi and M. Takizawa and U. Tamponi and K. Tanida and F. Tenchini and K. Trabelsi and M. Uchida and S. Uehara and T. Uglov and Y. Unno and S. Uno and P. Urquijo and Y. Usov and {Van Hulse}, C. and G. Varner and Wang, {C. H.} and Wang, {M. Z.} and P. Wang and M. Watanabe and Y. Watanabe and Williams, {K. M.} and E. Won and J. Yamaoka and J. Yelton and Y. Yook and Y. Yusa and Zhang, {C. C.} and Zhang, {Z. P.} and V. Zhilich and V. Zhukova and V. Zhulanov and A. Zupanc",
note = "Publisher Copyright: {\textcopyright} 2016 American Physical Society.",
year = "2016",
month = jun,
day = "30",
doi = "10.1103/PhysRevD.93.112017",
language = "English",
volume = "93",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "11",
}