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| 題名: | First observation of γγ →p p K+K- and search for exotic baryons in pK systems |
| 作者: | 陳鎰鋒;Shen, C. P.;Aihara, H.;Aushev, T.;Ayad, R.;Babu, V.;Badhrees, I.;Bakich, A. M.;Barberio, E.;Behera, P.;Bhardwaj, V.;Bhuyan, B.;Biswal, J.;Bonvicini, G.;Browder, T. E.;Chang, P.;Chobanova, V.;Choi, Y.;Cinabro, D.;Dalseno, J.;Danilov, M.;Dutta, D.;Fast, J. E.;Ferber, T.;Fulsom, B. G.;Gaur, V.;Gabyshev, N.;Garmash, A.;Glattauer, R.;Goldenzweig, P.;Hayasaka, K.;Hayashii, H.;Inguglia, G.;Ishikawa, A.;Itoh, R.;Iwasaki, Y.;Jaegle, I.;Julius, T.;Kato, E.;Kiesling, C.;Kim, D. Y.;Kim, J. B.;Kim, K. T.;Kim, S. H.;Kim, Y. J.;Križan, P.;Kwon, Y.-J.;Lange, J. S.;Li, C. H.;Li, H.;Li, L.;Liventsev, D.;Masuda, M.;Miyata, H.;Mizuk, R.;Mohanty, G. B.;Moll, A.;Moon, H. K.;Mussa, R.;Nanut, T.;Nishida, S.;Ostrowicz, W.;Pakhlova, G.;Pal, B.;Park, C.-S.;Park, H.;Pesántez, L.;Pestotnik, R.;Petrič, M.;Rauch, J.;Ritter, M.;Sakai, Y.;Schlüter, T.;Schneider, O.;Seino, Y.;Semmler, D.;Seong, I. S.;Shibata, T.-A.;Shiu, J.-G.;Simon, F.;Stanič, S.;Starič, M.;Stypula, J.;Sumiyoshi, T.;Tamponi, U.;Tenchini, F.;Trabelsi, K.;Uchida, M.;Uehara, S.;Unno, Y.;Uno, S.;Urquijo, P.;Usov, Y.;Hulse, C. Van;Wang, C. H.;Yook, Y.;Yusa, Y.;Zhilich, V.;Zhukova, V.;Zhulanov, V.;Zupanc, A. |
| 貢獻者: | 理學院物理學系 |
| 關鍵詞: | baryon: exotic;BELLE;cross section: branching ratio: upper limit;electron positron: annihilation;electron positron: colliding beams;exchange: two-photon;experimental results;High Energy Physics - Experiment;High Energy Physics - Phenomenology;info:eu-repo/classification/ddc/530;K: pair production;KEK-B;Lambda;mass spectrum: (K pi);Theta |
| 日期: | 2016-06-30 |
| 上傳時間: | 2026-04-23 11:56:37 (UTC+8) |
| 出版者: | American Physical Society;American Physical Society (APS) |
| 摘要: | 摘要： 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 $p K^-$~($\bar{p}K^+$) or $pK^+$~($\bar{p} K^-$) invariant mass spectra. Cross sections for $\gamma \gamma \to p \bar{p} K^+ K^-$, $\Lambda(1520)^0 \bar{p} K^+ +c.c.$ and the products $\sigma(\gamma \gamma \to \Theta(1540)^0 \bar{p} K^+ +c.c.)\BR(\Theta(1540)^0 \to p K^{-})$ and $\sigma(\gamma \gamma \to \Theta(1540)^{++} \bar{p} K^- +c.c.)\BR(\Theta(1540)^{++}\to p K^{+})$ 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 $p \bar{p} K^+ K^-$ at the 90\% credibility level. Comment: 9 pages, 9 figures
出版者： American Physical Society (APS)
出版日期： 2016-06-30
出處： Physical Review D, 2016-06, Vol.93 (11)
識別號： ISSN: 2470-0010
識別號： DOI: 10.1103/physrevd.93.112017 |
| 顯示於類別: | [物理學系] 期刊論文
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