CERN Accelerating science

Article
Title	Evidence for Lambda /sub c//sup +/ in inclusive pp to ( Lambda /sup 0/ pi /sup +/ pi /sup +/ pi /sup -/)+X and pp to (K/sup -/ pi /sup +/p)+X at square root s=53 and 62 GeV
Author(s)	Lockman, W ; Erhan, S ; Meyer, T ; Rander, J ; Schlein, P E ; Webb, R ; Zsembery, J
Affiliation	(Univ of California, Los Angeles, CA, USA)
Publication	1979
In:	Phys. Lett. B 85 (1979) 443-6
DOI	10.1016/0370-2693(79)91292-9
Subject category	Particle Physics - Phenomenology
Abstract	A search for the charmed baryon, Lambda /sub c//sup +/, has been carried out in inclusively measured Lambda /sup 0/ pi /sup +or-/ pi /sup +/ pi /sup -/ and K/sup -/ pi /sup +or-/p final states with longitudinal x>0.75 in an experiment at the CERN intersecting storage rings. An effect with invariant mass near 2.3 GeV is observed in Lambda /sup 0/ pi /sup +/ pi /sup +/ pi /sup -/ with cross section times branching ratio B sigma =(2.8+or-1.0) mu b; a similar effect is observed in K/sup -/ pi /sup +/p with B sigma (2.3+or-0.3) mu b. The effect is seen only in the positive charge state, in agreement with an interpretation as Lambda /sub c//sup +/. However, it is pointed out that in the same experiment, the non-charmed hyperon state Sigma (1385)/sup +/ also has a cross section, much larger than its corresponding charge state Sigma (1385)/sup -/. (13 refs).

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