Abstract
Even though the first observation of possible charmed baryon production(1) was prior to the discovery of the charmed D-meson(2) very much less is known experimentally, about charmed baryons than about charmed mesons. This is due to the fact that charmed mesons — at least the lowest mass states D,D¥, G — have been extensively produced and studied at SPEAR and DORIS, while this is not yet the case for charmed baryons. Actually all the experimental evidences for charmed particles, mesons as well as baryons, not coming from e+e- collisions, have been up to this year either indirect (emission of prompt leptons in hadronic interactions) or scanty (a few events in emulsions or bubble chambers). After a critical review of the early results on charmed baryons, recent observations in neutrino and hadron interactions will be described and their bearing on our understanding of hadronic production processes will be discussed.
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References
E.G. Cazzoli et al., Phys. Rev. Letters 34,1125 (1975).
E.G. Cazzoli et al.Some indirect corroboration is given by an event reported in S.J. Barish et al., Phys. Rev. D15,1 (1977).
G. Goldhaber et al., Phys. Rev. Letters 37,255 (1976).
A.de Rujula et al., Phys. ReviewD12,147 (1975)
J.G. Körner et al.,DESY 18/53 (October 1978)
B. Knapp et al., Phys. Rev. Letters 37,882 (1976).
M.S. Atiya et al., Phys. Rev. Letters 43,414 (August 1979).
W. Lockman et al.,UCLA-1109 (1977).
A. de Bellelon et al.,Nucl. Phys. B 109,129 (1976).
M. Piccolo et al., Phys. Rev. Letters 39,1503 (1977).
T. Ferguson et al.,SLAC PUB 208l (1978).
A.M. Cnops et al., Phys. Rev. Letters 42,197 (January 1979).
C. Baltay et al., Phys. Rev. Letters 42,1721 (June 1979).
C. Baltay et al., Phys. Rev. Letters 41,73 (1978).
C. Angelini et al., Phys. Letters 84B,150 (June 1979).
K.L. Giboni et al., Phys. Letters 85B,437 (August 1979).
W. Lockman et al., Phys. Letters 85B,443 (August 1979).
D. Drijard et al., Phys. Letters 85B,452 (August 1979).
M.G. Albrow et al.,Nucl. Phys.B108,1 (1976).
The mass-resolution in the experiment of ref. 15,which uses the same magnet,is better,due to the addition of supplementary multŕwire proportional chambers.
S. Erham et al., Phys. Letters 85B,447 (August 1979).
D. Drijard et al., Phys. Letters 81B,250 (February 1979).
M. Schindler,private communication (August 1979).
G. Feldmann,remark at the Gordon Conference (August 1979).
W. Geist,CERN/EP 79–78 (July 1979).
H. Wachsmuth,CERN/EP 79–115 (Octoher 1979).
C.E. Carlson and R. Suaya,Phys. Rev. D14,3115 (1976).
A.M. Georgi et al.,HUTP-78/A008 (1978).
F. Halzen and S. Matsuda,Phys. Rev. D17,1344 (1978).
H. Fritzsch and K.H. Streng,Phys. Letters 78B,447 (1978).
Point 2,which seems high,results from the observation of 5 prompt single electrons in a π-p experiment in BEBC. Their mean pT is .3 GeV/c,rather low compared to that expected from D Kev → or Kev decays. For comparison,point 11 was calculated using only electrons -with pT > .5 GeV/c; if the more numerous electrons with pT < . 5 GeV/c were attributed to charm,the cross-section would jump to 700 μb.
L. Van Hove,TH 2628-CERN (February 1979)
L. Van Hove,J. Ranft,SLAC-PUB 2052 and KMU-HEP 79–03.
Gluoproduction (ref. 30) has kinematical characteristics similar to diffraction: if the gluon of proton 1 has momentum p→ξ,the baryonic system it forms with proton 2,of momentum -p→ has mass 2p√ξ . Since ξ is on the average small,this mass is comparable to a diffractive mass 2p √1 - x, with x > .8. The two processes can be distinguished only by dynamical properties (x and pT distribution,s dependence).
G. Gustalson and C. Peterson,Phys. Letters67B, 81 (1977).
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Muller, F. (1980). Recent Observations of Charmed Baryons and Their Implications for Hadronic Production Processes. In: Lévy, M., Basdevant, JL., Speiser, D., Weyers, J., Gastmans, R., Jacob, M. (eds) Quarks and Leptons. NATO Advanced Study Institutes Series, vol 61. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-7197-7_14
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DOI: https://doi.org/10.1007/978-1-4684-7197-7_14
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