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At the American Physical Society meeting held during April 16-19,
2005, the CLAS collaboration presented results for one out of a series of
high-statistics experiments. This one was expected to show evidence
for the pentaquark, but surprisingly, no evidence was found. This
contradicts an earlier low-statistics measurement, and shows the
importance of getting high statistics. The CLAS detector at
Thomas Jefferson National Accelerator Laboratory is perhaps the
only place in the world that can acquire this quantity of data
for this photoproduction reaction. This is a prime
example of the scientific method at work (results must be
reproducible at high statistics before they are accepted).
However, the existence of the pentaquark is still an open question. There are many other experiments with positive evidence for the "Theta" pentaquark. Now the task of proving the existence of the "Theta" will be more difficult. Stay tuned as progress continues. |
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The following links may be useful for more information:
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Other useful links:
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| Last modified: April 15, 2005
Kenneth Hicks |
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