Observation of a Near-Threshold Enhancement in the e(+) e(-)-> Lambda(+)(c) Lambda(-)(c) Cross Section Using Initial-State Radiation

  • Pakhlova, G.
  • Adachi, I.
  • Aihara, H.
  • Arinstein, K.
  • Aulchenko, V.
  • ... Cheon, Byung Gu
  • 외 133명
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281

초록

We report a measurement of the exclusive e(+) e(-) -> Lambda(+)(c)Lambda(-)(c) cross section as a function of center-of-mass energy near the Lambda(+)(c)Lambda(-)(c) threshold. A clear peak with a significance of 8.2 sigma is observed in the Lambda(+)(c)Lambda(-)(c) invariant mass distribution just above threshold. With an assumption of a resonance origin for the observed peak, a mass and width of M = [4634(-7)(+8)(stat)(-8)(+5)(syst)] MeV/c(2) and Gamma(tot) = [92(-24)(+40)(stat)(-21)(+10)(syst)] MeV are determined. The analysis is based on a study of events with initial-state-radiation photons in a data sample collected with the Belle detector at the Upsilon(4S) resonance and nearby continuum with an integrated luminosity of 695 fb(-1) at the KEKB asymmetric-energy e(+)e(-) collider.

제목
Observation of a Near-Threshold Enhancement in the e(+) e(-)-> Lambda(+)(c) Lambda(-)(c) Cross Section Using Initial-State Radiation
저자
Pakhlova, G.Adachi, I.Aihara, H.Arinstein, K.Aulchenko, V.Aushev, T.Bakich, A. M.Balagura, V.Bedny, I.Bhardwaj, V.Bitenc, U.Bondar, A.Bozek, A.Bracko, M.Brodzicka, J.Browder, T. E.Chang, P.Chen, A.Cheon, Byung GuChiang, C. -C.Chistov, R.Cho, I. -S.Choi, S. -K.Choi, Y.Dalseno, J.Danilov, M.Dash, M.Eidelman, S.Gabyshev, N.Ha, H.Haba, J.Hayasaka, K.Hazumi, M.Heffernan, D.Hoshi, Y.Hou, W. -S.Hsiung, Y. B.Hyun, H. J.Iijima, T.Inami, K.Ishikawa, A.Ishino, H.Itoh, R.Iwasaki, M.Iwasaki, Y.Kah, D. H.Kang, J. H.Katayama, N.Kawai, H.Kawasaki, T.Kichimi, H.Kim, H. J.Kim, H. O.Kim, S. K.Kim, Y. I.Kim, Y. J.Kinoshita, K.Krizan, P.Krokovny, P.Kumar, R.Kuzmin, A.Kwon, Y. -J.Kyeong, S. -H.Lange, J. S.Lee, J. S.Lee, S. E.Lesiak, T.Li, J.Limosani, A.Liu, C.Liventsev, D.Mandl, F.Matyja, A.Miyabayashi, K.Miyata, H.Miyazaki, Y.Mizuk, R.Mori, T.Nakano, E.Nakao, M.Natkaniec, Z.Nishida, S.Nitoh, O.Noguchi, S.Ogawa, S.Ohshima, T.Okuno, S.Olsen, S. L.Ozaki, H.Pakhlov, P.Palka, H.Park, C. W.Park, H.Park, H. K.Peak, L. S.Piilonen, L. E.Poluektov, A.Sahoo, H.Sakai, Y.Schneider, O.Senyo, K.Shapkin, M.Shen, C. P.Shiu, J. -G.Shwartz, B.Singh, J. B.Sokolov, A.Stanic, S.Staric, M.Sumiyoshi, T.Tanaka, M.Taylor, G. N.Teramoto, Y.Tikhomirov, I.Uehara, S.Uglov, T.Unno, Y.Uno, S.Urquijo, P.Usov, Y.Varner, G.Wang, C. H.Wang, M. -Z.Wang, P.Wang, X. L.Watanabe, Y.Wedd, R.Won, E.Yabsley, B. D.Yamashita, Y.Yamauchi, M.Yuan, C. Z.Zhang, C. C.Zhang, Z. P.Zhilich, V.Zhulanov, V.Zivko, T.Zupanc, A.Zyukova, O.
DOI
10.1103/PhysRevLett.101.172001
발행일
2008-10
유형
Article
저널명
Physical Review Letters
101
17
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