| Autor: |
H. H. Seyfert, A. Grant, P. Bosetti, T. P. Kokott, Donald H. Perkins, D. R. O. Morrison, H. Wachsmuth, J. Blietschau, Peter Schmid, R. Pech, A. Vayaki, Ch. Peyrou, B. Nellen, V. T. Cocconi, M. Aderholz, H. G. Heilmann, H. Grässler, D. Haidt, W. Wittek, D. Lanske, B. Saitta, J. von Krogh, P. Checchia, G. Myatt, P. O. Hulth, H. Saarikko, Christoph Geich-Gimbel, Reinhard W. Schulte, P. Cartwright, R. H. Giles, W. G. Scott, E. Simopoulou, Luc Pape, D. Radojicic, D.C. Cundy, E. A. De Wolf, P. Grossmann, R. McGow, N. Schmitz, K. L. Wernhard, B. Conforto, W. Krenz, R. Settles, P. B. Renton, K. Böckmann |
| Rok vydání: |
1979 |
| Předmět: |
|
| Zdroj: |
Physics Letters B. 86:108-114 |
| ISSN: |
0370-2693 |
| DOI: |
10.1016/0370-2693(79)90631-2 |
| Popis: |
Production of charmed mesons has been observed in neutrino-hydrogen interactions in 285 000 photographs of BEBC exposed to the CERN wide-band neutrino beam. In ∼ 6000 charged current events, two events have been found each giving a three-constraint kinematical fit with production of only one strange particle, namely a K−, which is identified by its characteristic reaction K−p→Σ−π+. These events are thus examples of ΔS=−ΔQ reactions corresponding to charm production on a valence quark. For both events the effective mass of a (K− + pions) system is equal to the D0(1863) mass while the effective mass of this system plus a π+ is equal to the D∗+(2009) mass. The mass difference ΔM=M( D ∗+ )−M D 0 is 145.2 ± 0.6 MeV. The first event is interpreted as ν p →μ − pD ∗+ and the second as ν p →μ − pD ∗+ π + π − , both with D ∗+ → D 0 π + . The rate of inclusive D∗+ production has been estimated for all events by assuming that each negative track in turn is a K− and using the fact that the error on ΔM is small. It is found that the cross section σ(ν p →μ − D ∗+ + anything ) relative to σ(νp→μ− + anything), above the D∗ threshold, is (4.1 ± 2.4)%. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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