Search for charm in 250 GeV/c $pi$$sup -$p interactions Page: 3 of 12
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The discovery of the 4 and i'' has led to much speculation
that these particles may contain a fourth, "charmed" quark. In
the present schemes, the ip and p' would consist of cc pairs, and
thus have zero units of charm. However a number of other particles
containing charm are also postulated.2 The decay of these particles
would often contain a strange particle, with non-leptonic decays
expected to dominate. We report here on a search for these charmed
particles using neutral strange particle decays in the Fcrmilab
15-ft bubble chamber.
The 15-ft chamber is an ideal instrument for such a search.
Its 47T geometry and large fiducial length (4.7 m) allow for detec-
tion of more strange decays, particularly in the forward direction
than in smaller chambers (for example, the detection efficiency for
finding a KSo -+ +- decay in the 15' chamber is ~ 90% for this
experiment, and only - 50% in the 30-inch chamber). In particular,
the detection of events with two or more neutral strange decays is
greatly enhanced over smaller chambers. It is this advantage that
we utilize in the present study. If an associated charm-anticharm
pair is produced, both charmed particles may decay into a strange
particle plus pions. Thus we search for charm among the events
containing two neutral strange particles.
This search has been sensitive to the following specific
charmed-particle-production processes:
n- + p + Bc + Mc + X
+M +Mc +X (1)
+ Bc + Rc + X-1-
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Bogert, D.; Hanft, R. & Albright, J.R. Search for charm in 250 GeV/c $pi$$sup -$p interactions, article, October 1, 1975; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc871235/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.