$Search for the deeply bound $K^-pp$ state from the semi-inclusive forward-neutron spectrum in the in-flight $K^-$ reaction on helium-3$

Search for the deeply bound $K^-pp$ state from the semi-inclusive forward-neutron spectrum in the in-flight $K^-$ reaction on helium-3

An experiment to search for the $K^-pp$ bound state was performed via the in-flight $^3$He($K^-,n)$ reaction using 5.3 $\times$ $10^9$ kaons at 1 GeV/$c$ at the J-PARC hadron experimental facility. In the semi-inclusive neutron missing-mass spectrum at $\theta_{n}^{lab}=0^\circ$, no si...

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Veröffentlicht in:	arXiv.org 2015-05
Hauptverfasser:	Hashimoto, Tadashi, Ajimura, Shuhei, Beer, George, Bhang, Hyoungchan, Bragadireanu, Mario, Busso, Luigi, Cargnelli, Michael, Choi, Seonho, Curceanu, Catalina, Enomoto, Shun, Faso, Diego, Fujioka, Hiroyuki, Fujiwara, Yuya, Fukuda, Tomokazu, Guaraldo, Carlo, Hayano, Ryugo S, Hiraiwa, Toshihiko, Iio, Masami, Iliescu, Mihai, Inoue, Kentaro, Ishiguro, Yosuke, Ishikawa, Takashi, Ishimoto, Shigeru, Itahashi, Kenta, Iwai, Masaaki, Iwasaki, Masahiko, Kato, Yuko, Kawasaki, Shingo, Kienle, Paul, Kou, Hiroshi, Ma, Yue, Marton, Johann, Matsuda, Yasuyuki, Mizoi, Yutaka, Morra, Ombretta, Nagae, Tomofumi, Noumi, Hiroyuki, Ohnishi, Hiroaki, Okada, Shinji, Outa, Haruhiko, Piscicchia, Kristian, Marco Poli Lener, Antonio Romero Vidal, Sada, Yuta, Sakaguchi, Atsushi, Sakuma, Fuminori, Sato, Masaharu, Scordo, Alessandro, Sekimoto, Michiko, Shi, Hexi, Sirghi, Diana, Sirghi, Florin, Suzuki, Shoji, Suzuki, Takatoshi, Tanida, Kiyoshi, Tatsuno, Hideyuki, Tokuda, Makoto, Tomono, Dai, Toyoda, Akihisa, Tsukada, Kyo, Oton Vazquez Doce, Widmann, Eberhard, Yamaga, Takumi, Yamazaki, Toshimitsu, Yim, Heejoong, Zhang, Qi, Zmeskal, Johann
Format:	Artikel
Sprache:	eng
Schlagworte:	Confidence intervals Helium isotopes Kaons Proton accelerators
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Beschreibung
Zusammenfassung:	An experiment to search for the $K^-pp$ bound state was performed via the in-flight $^3$He($K^-,n)$ reaction using 5.3 $\times$ $10^9$ kaons at 1 GeV/$c$ at the J-PARC hadron experimental facility. In the semi-inclusive neutron missing-mass spectrum at $\theta_{n}^{lab}=0^\circ$, no significant peak was observed in the region corresponding to $K^-pp$ binding energy larger than 80 MeV, where a bump structure has been reported in the $\Lambda p$ final state in different reactions. Assuming the state to be isotropically decaying into $\Lambda p$, mass-dependent upper limits on the production cross section were determined to be 30--180, 70--250, and 100--270 $\mu$b/sr, for the natural widths of 20, 60, and 100 MeV, respectively, at 95\% confidence level.
ISSN:	2331-8422
DOI:	10.48550/arxiv.1408.5637

Zusammenfassung:	An experiment to search for the \(K^-pp\) bound state was performed via the in-flight \(^3\)He(\(K^-,n)\) reaction using 5.3 \(\times\) \(10^9\) kaons at 1 GeV/\(c\) at the J-PARC hadron experimental facility. In the semi-inclusive neutron missing-mass spectrum at \(\theta_{n}^{lab}=0^\circ\), no significant peak was observed in the region corresponding to \(K^-pp\) binding energy larger than 80 MeV, where a bump structure has been reported in the \(\Lambda p\) final state in different reactions. Assuming the state to be isotropically decaying into \(\Lambda p\), mass-dependent upper limits on the production cross section were determined to be 30--180, 70--250, and 100--270 \(\mu\)b/sr, for the natural widths of 20, 60, and 100 MeV, respectively, at 95\% confidence level.
ISSN:	2331-8422
DOI:	10.48550/arxiv.1408.5637

Search for the deeply bound \(K^-pp\) state from the semi-inclusive forward-neutron spectrum in the in-flight \(K^-\) reaction on helium-3