Search for a Light Pseudoscalar Particle in the DecayKL0→π0π0X

Autor:	J. Nix, M. Yamaga, S. Podolsky, E. Iwai, T. Yamanaka, A. Lednev, V. A. Baranov, M. Doroshenko, T. Tsukamoto, Toru Sato, M. Sekimoto, Y. C. Tung, T. K. Komatsubara, T. Shinkawa, Y. Yoshimura, H. S. Lee, S. Suzuki, H. Morii, T. Inagaki, Y. Akune, J. K. Ahn, T. Nakano, K. Omata, S. Kobayashi, H. Okuno, Hiroshi Yoshida, J. R. Comfort, Y. W. Wah, G. Y. Lim, Soo Young Lee, Yasuhisa Tajima, I. Kato, Takashi Nomura, M. L. Wu, Y. B. Hsiung, Y. Zheng, T. Matsumura, Masaharu Nomachi, Toshi Sumida, J. Ma, N. Sasao, Hajime Nanjo, H. Watanabe, E. Kuzmin, Y. Fujioka, Z. Tsamalaidze, T. Iwata, T. Morimoto, Ryusei Ogata, S. Ishibashi, A. S. Kurilin, N. Ishihara, S. Takita, Yorihito Sugaya, H. Ishii, K. Sakashita, H. Sato, G. N. Perdue, K. F. Chen, A. Moisseenko, Akira Sugiyama, T. Sasaki
Rok vydání:	2009
Předmět:	Pseudoscalar Nuclear physics Physics Particle decay Photon Branching fraction Analytical chemistry General Physics and Astronomy
Zdroj:	Physical Review Letters. 102
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.102.051802
Popis:	We performed a search for a light pseudoscalar particle X in the decay K{sub L}{sup 0}{yields}{pi}{sup 0}{pi}{sup 0}X, X{yields}{gamma}{gamma} with the E391a detector at KEK. Such a particle with a mass of 214.3 MeV/c{sup 2} was suggested by the HyperCP experiment. We found no evidence for X and set an upper limit on the product branching ratio for K{sub L}{sup 0}{yields}{pi}{sup 0}{pi}{sup 0}X, X{yields}{gamma}{gamma} of 2.4x10{sup -7} at the 90% confidence level. Upper limits on the branching ratios in the mass region of X from 194.3 to 219.3 MeV/c{sup 2} are also presented.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::df91a2fb92beb53b8863ad42d754b5a2 https://doi.org/10.1103/physrevlett.102.051802 Zobrazit plný text záznamu