Measurement of $\Xi_c$ production in $e^+e^-$ annihilation at 10.5 GeV center-of-mass energy
- Albrecht, H.
- Ehrlichmann, H.
- Sefkow, F.
- Wurth, R.
- Appuhn, R. D.
- Hast, C.
- Herrera, G.
- Kolanoski, H.
- Lange, A.
- Lindner, A.
- Mankel, R.
- Schieber, M.
- Hamacher, T.
- Siegmund, T.
- Spaan, B.
- Thurn, H.
- Töpfer, D.
- Walther, A.
- Wegener, D.
- Paulini, M.
- Reim, K.
- Volland, U.
- Wegener, H.
- Krüger, A.
- Mundt, R.
- Reim, K.
- Schmidt-Parzefall, W.
- Funk, W.
- Stiewe, J.
- Werner, S.
- Ball, S.
- Gabriel, J. C.
- Geyer, C.
- Hölscher, A.
- Nau, A.
- Hofmann, W.
- Holzer, B.
- Khan, S.
- Knöpfle, K. T.
- Spengler, J.
- Britton, D. I.
- Charlesworth, C. E. K.
- Edwards, K. W.
- Kapitza, H.
- Krieger, P.
- Nippe, A.
- Kutschke, R.
- MacFarlane, D. B.
- Orr, R. S.
- Patel, P. M.
- Prentice, J. D.
- Seidel, S. C.
- Tsipolitis, G.
- Tzamariudaki, K.
- Van de Water, R. G.
- Yoon, T.-S.
- Reidenbach, M.
- Reßing, D.
- Schael, S.
- Schubert, K. R.
- Strahl, K.
- Waldi, R.
- Weseler, S.
- Boštjančič, B.
- Kernel, G.
- Križan, P.
- Križnič, E.
- Schäfer, M.
- Podobnik, T.
- Živko, T.
- Cronström, H. I.
- Jönsson, L.
- Balagura, V.
- Danilov, M.
- Droutskoy, A.
- Fominykh, B.
- Golutvin, A.
- Gorelov, I.
- Schröder, H.
- Ratnikov, F.
- Lubinov, V.
- Pakhlov, P.
- Rostovtsev, A.
- Semenov, A.
- Semenov, S.
- Shevchenko, V.
- Soloshenko, V.
- Tichomirov, I.
- Zaitsev, Yu.
- Schulz, H. D.
- Childers, R.
- Darden, C. W.
- ARGUS Collaboration
DOIAbstract
Using the ARGUS detector at the $e^+e^−$ storage ring DORIS II at DESY, we have observed production of the charmed-strange baryon Ξc+ and its neutral isospin partner, the $Ξ_c^0$. The $Ξ_c^+$ was reconstructed in the final state $Ξ^−π^+π^+$, while the $Ξ_c^0$ was seen in decay to Ξ−π+ and Ξ−π+π+π−. The average $Ξc$ fragmentation spectrum has been determined, as well as the production cross section times branching ratio for each decay mode. The charged and neutral masses were measured to be 2465.1 ± 3.6 ± 1.9 MeV/c$^2$ and 2472.1 ± 2.7 ± 1.6 MeV/c$^2$ respectively, corresponding to a mass-splitting, $M(Ξc^+)^− M(Ξ_c^0)%, of −7.0±4.5±2.2 MeV/c$^2$