{"paper":{"title":"First observation of $\\gamma \\gamma \\to p \\bar{p} K^+ K^-$ and search for exotic baryons in $pK$ systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ph"],"primary_cat":"hep-ex","authors_text":"A. Bobrov, A. Bozek, A. Chen, A. Garmash, A. Ishikawa, A. Kuzmin, A. M. Bakich, A. Moll, A. Sokolov, A. Zupanc, B. Bhuyan, Belle Collaboration: C. P. Shen, B. G. Cheon, B. G. Fulsom, B. Pal, B. Shwartz, C. C. Zhang, C. H. Li, C. H. Wang, C. Kiesling, C. Pulvermacher, C. Schwanda, C.-S. Park, C. Van Hulse, C. Z. Yuan, D. Cinabro, D. Dutta, D. Kotchetkov, D. Liventsev, D. M. Asner, D. Matvienko, D. Semmler, D. \\v{C}ervenkov, D. Y. Kim, E. Barberio, E. Kato, E. Nakano, E. Solovieva, E. Won, F. Simon, F. Tenchini, G. B. Mohanty, G. Bonvicini, G. Inguglia, G. Pakhlova, G. Schnell, G. Varner, H. Aihara, H. B. Jeon, H. Hayashii, H. K. Moon, H. Li, H. Miyata, H. Park, I. Adachi, I. Badhrees, I. Jaegle, I. S. Seong, J. Biswal, J. B. Kim, J. Dalseno, J. E. Fast, J. F. Strube, J.-G. Shiu, J. Haba, J. Libby, J. Rauch, J. S. Lange, J. Stypula, J. Yamaoka, J. Yelton, K. Chilikin, K. Cho, K. Hayasaka, K. H. Kang, K. Inami, K. J. Nath, K. K. Joo, K. Miyabayashi, K. M. Williams, K. Senyo, K. Tanida, K. T. Kim, K. Trabelsi, L. E. Piilonen, L. Li, L. Li Gioi, L. Pes\\'antez, L. Santelj, M. Bra\\v{c}ko, M. Danilov, M. E. Sevior, M. Lubej, M. Masuda, M. Nakao, M. Petri\\v{c}, M. Ritter, M. Stari\\v{c}, M. Sumihama, M. Takizawa, M. Uchida, M. Watanabe, M.-Z. Wang, N. Dash, N. Gabyshev, O. Grzymkowska, O. Schneider, P. Behera, P. Chang, P. Goldenzweig, P. Kody\\v{s}, P. Kri\\v{z}an, P. Krokovny, P. Pakhlov, P. Urquijo, P. Wang, R. Ayad, R. Chistov, R. Gillard, R. Glattauer, R. Itoh, R. Mizuk, R. Mussa, R. Pestotnik, S. Eidelman, S. H. Kim, S.-K. Choi, S. Korpar, S. L. Olsen, S. Mohanty, S. Nishida, S. Ogawa, S. Sandilya, S. Stani\\v{c}, S. Uehara, S. Uno, T.-A. Shibata, T. Aushev, T. E. Browder, T. Ferber, T. Iijima, T. Julius, T. Luo, T. Matsuda, T. Nanut, T. Sanuki, T. Schl\\\"uter, T. Sumiyoshi, T. Uglov, U. Tamponi, V. Aulchenko, V. Babu, V. Bhardwaj, V. Chekelian, V. Chobanova, V. Gaur, V. Savinov, V. Zhilich, V. Zhukova, V. Zhulanov, W. Ostrowicz, W.-S. Hou, W. X. Fang, Y. Choi, Y. Iwasaki, Y. J. Kim, Y.-J. Kwon, Y. Li, Y. Sakai, Y. Seino, Y. Unno, Y. Usov, Y. Watanabe, Y. Yook, Y. Yusa, Z. Dole\\v{z}al, Z. Dr\\'asal, Z. Natkaniec, Z. P. Zhang","submitted_at":"2016-04-09T05:19:39Z","abstract_excerpt":"The process $\\gamma \\gamma \\to p \\bar{p} K^+ K^-$ 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 $p \\bar{p} K^+ K^-$ and a $\\Lambda(1520)^0~(\\bar{\\Lambda}(1520)^0)$ signal in the $pK^-$~($\\bar{p} K^+$) invariant mass spectrum are clearly observed. However, no evidence for an exotic baryon near 1540~MeV/$c^2$, denoted as $\\Theta(1540)^0$~($\\bar{\\Theta}~(1540)^0$) or $\\Theta(1540)^{++}$~($\\Theta(1540)^{--}$), is seen in the $p K^-$~($\\bar{p}K^+$) "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.02525","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}