First observation of $\gamma \gamma \to p \bar{p} K^+ K^-$ and search for exotic baryons in $pK$ systems

C. P. Shen, P. K. Behera,M. Bračko,D. Liventsev, M. Petrič, Y. Yook,V. Chekelian,M. Masuda,V. Babu,S. Uehara,K. Hayasaka,T. Matsuda,T. Uglov,E. Won,D. Dutta,R. Mizuk,Y. Choi,K. H. Kang,B. G. Cheon,I. Jaegle,H. Park,O. Grzymkowska, T. Sumiyoshi,H. B. Jeon,K. T. Kim,A. Bobrov,G. B. Mohanty,K. Cho,A. M. Bakich, P. Wang,V. Zhukova,L. Pesántez,T. Iijima,A. Ishikawa,T. E. Browder,A. Bozek,J. Biswal,D. Y. Kim, J. Libby, F. Tenchini, G. Inguglia,Y. Watanabe, K. Inami, M. Sumihama,M. Takizawa,L. Santelj, R. Pestotnik,H. Hayashii,L. E. Piilonen, C. Z. Yuan, Y. Sakai, J. Haba,S. Korpar,B. G. Fulsom,S. Ogawa,A. Kuzmin,T. Julius,T. Aushev,G. Bonvicini, Z. Drásal, E. Solovieva, P. Kodys,M. Ritter,S. L. Olsen, G. Varner, W. Ostrowicz, O. Schneider,H. Li, Z. Natkaniec, V. Aulchenko,M. E. Sevior,A. Moll,D. M. Asner,S. Uno,T. Schlüter,K. M. Williams, D. Matvienko,I. Adachi,Y. Li,J. Yamaoka,V. Bhardwaj,M. Lubej,V. Gaur, Y. Unno, D. Červenkov,P. Chang, R. Chistov,M. Watanabe,C. S. Park,T. Luo, T. Ferber, E. Barberio,U. Tamponi,J. G. Shiu,H. K. Moon, R. Gillard,S. Eidelman,Z. Doležal, P. Križan,V. Zhulanov, R. Mussa, R. Ayad, M. Nakao,C. Schwanda, P. Urquijo, H. Aihara, P. Goldenzweig,L. Li Gioi, S. H. Kim, T. Sanuki,V. Zhilich,T.-A. Shibata,K. Senyo, J. Strube,C. H. Wang, J. S. Lange,A. Chen,R. Glattauer,Y. J. Kim, M. Starič,V. Chobanova, Y. Kwon, K. Tanida, N. Gabyshev, J. Dalseno, P. Krokovny, J. B. Kim, K. Chilikin,P. Pakhlov, J. Stypula,J. Rauch,S. Mohanty,F. Simon,N. Dash, D. Semmler,C. Pulvermacher,C. H. Li, Z. P. Zhang,M. Wang, Y. Seino,Ihn Sik Seong,H. Miyata,C. Van Hulse, K. Trabelsi, K. Miyabayashi,B. Bhuyan,S.-K. Choi, Y. Yusa, R. Itoh, Y. Iwasaki, G. Schnell, M. Danilov,A. Sokolov, K. J. Nath,I. Badhrees,W.-S. Hou, V. Savinov, D. Kotchetkov,L. Li, A. Zupanc,J. Fast,E. Kato, D. Cinabro, E. Nakano, G. Pakhlova, S. Nishida, Wenxing Fang, S. Sandilya, B. Shwartz,T. Nanut, C. C. Zhang, K. K. Joo, A. Garmash, S. Stanič, C. Kiesling,B. K. Pal,J. Yelton,Y. Usov,M. Uchida

PHYSICAL REVIEW D（2016）

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摘要

The process gamma gamma -> p (p) over barK(+)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 p (p) over barK(+)K(-) and a Lambda(1520)(0) ((Lambda) over bar (1520)(0)) signal in the pK(-) ((p) over barK(+)) invariant mass spectrum are clearly observed. However, no evidence for an exotic baryon near 1540 MeV/c(2), denoted as Theta(1540)(0) ((Theta) over bar (1540)(0)) or Theta(1540)(++) (Theta(1540)(--)), is seen in the pK(-) ((p) over barK(+)) or pK(+) ((p) over barK(-)) invariant mass spectra. Cross sections for gamma gamma -> p (p) over barK(+)K(-), Lambda(1520)(0)(p) over barK(+) + c.c. and the products sigma(gamma gamma -> Theta(1540)(0)(p) over barK(+) + c.c.)B(Theta(1540)(0) -> pK(-)) and sigma(gamma gamma -> Theta(1540)(++)(p) over barK(-) + c.c.)B(Theta(1540)(++) -> pK(+)) are measured. We also determine upper limits on the products of the chi(c0) and chi(c2) two-photon decay widths and their branching fractions to p (p) over barK(+)K(-) at the 90% credibility level.

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