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The PLUTO experiment at DORIS (DESY) and the discovery of the gluon (A Recollection) | | Bruno R. Stella
; Hans-Jürgen Meyer
; | | Date: |
11 Aug 2010 | | Abstract: | With the aim of determining the contribution of the PLUTO experiment at the
DORIS e+e- storage ring to the discovery of the gluon, as members of this
former collaboration we have reconsidered all the scientific material produced
by PLUTO in 1978 and the first half of 1979. It is clear that the experiment
demonstrated the main decay of the Y(9.46 GeV) resonance to be mediated by 3
gluons, by providing evidence for the agreement of this hypothesis with average
values and differential distributions of all possible experimental variables
and by excluding all other possible alternative models. Moreover PLUTO measured
in June 1979 the matrix element of the 3-gluon decay to be quantitatively as
expected by QCD (even after hadronization) and, having checked the possibility
to correctly trace the gluons’ directions, demonstrated the spin 1 nature of
the gluon by excluding spin 0 and spin 1/2. The hadronization of the gluon like
a quark jet, hypothesized in the 3-gluon jet Monte Carlo simulation, was
compatible with the topological data at this energy and was shown to be an
approximation at 10% level for the multiplicity (approx. <p||>-1); the right
expected gluon fragmentation was needed for the inclusive distributions; this
was the first experimental study of (identified) gluon jets. In the following
measurements at the PETRA storage ring, these results were confirmed by PLUTO
and by three contemporaneous experiments by evidencing at higher energies the
gluon radiation ("bremsstrahlung"), the softer one, by jet broadening, and the
hard one, by the emission of (now clearly visible) gluon jets by quarks. The
gluon’s spin 1 particle nature was also confirmed. The PLUTO results on Y
decays had been confirmed both by contemporaneous experiments at DORIS
(partially) and later (also partially) were confirmed by more sophisticated
detectors. | | Source: | arXiv, 1008.1869 | | Services: | Forum | Review | PDF | Favorites | |
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