/ Experiment-Nucl


J-PARC E19 Experiment: Pentaquark Θ+ Search in Hadronic Reaction at J-PARC


Takahashi, Tomonori N. (Osaka U., Res. Ctr. Nucl. Phys.) ; Adachi, Satoshi (Kyoto U.) ; Agnello, Michelangelo (INFN, Turin) ; Ajimura, Shuhei (Osaka U., Res. Ctr. Nucl. Phys.) ; Aoki, Kanae (KEK, Tsukuba) ; Bhang, Hyoung Chan (Seoul Natl. U.) ; Bassalleck, Bernd (New Mexico U.) ; Botta, Elena (Turin U.) ; Bufalino, Stefania (INFN, Turin) ; Chiga, Nobuyuki (Tohoku U.) ; Ekawa, Hiroyuki (Kyoto U.) ; Evtoukhovitch, Petr (Dubna, JINR) ; Feliciello, Alessandro (INFN, Turin) ; Fujioka, Hiroyuki (Kyoto U.) ; Hayakawa, Shuhei (Osaka U., Inst. Phys.) ; Hiruma, Fumiki (Tohoku U.) ; Honda, Ryotaro (Tohoku U.) ; Hosomi, Kenji (JAEA, Ibaraki) ; Ichikawa, Yudai (Kyoto U.) ; Ieiri, Masaharu (KEK, Tsukuba) ; Igarashi, Youichi (KEK, Tsukuba) ; Imai, Ken’ichi (JAEA, Ibaraki) ; Ishibashi, Naoya (Osaka U., Inst. Phys.) ; Ishimoto, Shigeru (KEK, Tsukuba) ; Itahashi, Kenta (Nishina Ctr., RIKEN) ; Iwasaki, Ruri (KEK, Tsukuba) ; Joo, Chang Woo (Seoul Natl. U.) ; Kanatsuki, Shunsuke (Kyoto U.) ; Kim, Mi Jung (Seoul Natl. U.) ; Kim, Sun Ji (Seoul Natl. U.) ; Kiuchi, Ryuta (Seoul Natl. U.) ; Koike, Takeshi (Tohoku U.) ; Komatsu, Yusuke (Tokyo U.) ; Kulikov, Vyacheslav Vasil’evich (Moscow, ITEP) ; Marcello, Simonetta (Turin U.) ; Masumoto, Shinichi (Tokyo U.) ; Matsumoto, Yuki (Tohoku U.) ; Matsuoka, Kenji (Osaka U., Inst. Phys.) ; Miwa, Koji (Tohoku U.) ; Moritsu, Manabu (Kyoto U.) ; Nagae, Tomofumi (Kyoto U.) ; Naruki, Megumi (KEK, Tsukuba) ; Niiyama, Masayuki (Kyoto U.) ; Noumi, Hiroyuki (Osaka U., Res. Ctr. Nucl. Phys.) ; Nozawa, Yuki (Kyoto U.) ; Ota, Ryosuke (Osaka U., Inst. Phys.) ; Ozawa, Kyoichiro (KEK, Tsukuba) ; Saito, Naohito (KEK, Tsukuba) ; Sakaguchi, Atsushi (Osaka U., Inst. Phys.) ; Sako, Hiroyuki (JAEA, Ibaraki) ; Samoilov, Valentin (Dubna, JINR) ; Sato, Misako (Tohoku U.) ; Sato, Susumu (JAEA, Ibaraki) ; Sato, Yoshinori (KEK, Tsukuba) ; Sawada, Shin’ya (KEK, Tsukuba) ; Sekimoto, Michiko (KEK, Tsukuba) ; Shirotori, Kotaro (JAEA, Ibaraki) ; Sugimura, Hitoshi (JAEA, Ibaraki) ; Suzuki, Shoji (KEK, Tsukuba) ; Takahashi, Hitoshi (KEK, Tsukuba) ; Takahashi, Toshiyuki (KEK, Tsukuba) ; Tamura, Hirokazu (Tohoku U.) ; Tanaka, Toshiyuki (Osaka U., Inst. Phys.) ; Tanida, Kiyoshi (Seoul Natl. U.) ; Tokiyasu, Atsushi O. (Kyoto U.) ; Tomida, Natsuki (Kyoto U.) ; Tsamalaidze, Zviadi (Dubna, JINR) ; Ukai, Mifuyu (Tohoku U.) ; Yagi, Kazuya (Tohoku U.) ; Yamamoto, Takeshi O. (Tohoku U.) ; Yang, Seong Bae (Seoul Natl. U.) ; Yonemoto, Yoshio (Tohoku U.) ; Yoon, Choong Jae (Seoul Natl. U.) ; Yoshida, Kotaro (Osaka U., Inst. Phys.)

Published in: JPS Conf.Proc.
Year: 2015
Vol.: 8
Page No: 022011
Pages: 6
Year: 2015 published

Abstract: A search for the Θ^+ pentaquark in the \(\pi ^{ - }p \to K^{ - }X\) reaction was performed at the J-PARC Hadron Facility. Two data samples were collected in 2010 and 2012 at π beam momenta of 1.92 and 2.0 GeV/c, respectively. No peak structure was observed in the missing mass spectra obtained from either data set. The upper limit for the production cross section averaged over the scattering-angle range of 2° to 15° in the laboratory frame was found to be 0.28 µb/sr. The decay width of the Θ^+ can be directly connected to the production cross section through a theoretical calculation using an effective Lagrangian. The estimated upper limits of the width were 0.41 and 2.8 MeV for the spin-parities of 1/2^+ and 1/2^−, respectively.

Web-Page: http://inspirehep.net/record/1400415/files/JPSCP.8.htm


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Total numbers of views: 610
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DOI: 10.7566/JPSCP.8.022011
 Record created 2015-11-02, last modified 2015-11-02


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