A new proposal for glueball exploration in hard gluon fragmentation

Abstract

An unambiguous identification of glueballs in experiments will be of great significance, because their existence is an important test of QCD. The proposal, advanced here, is to experimentally search for glueballs as peaks in the invariant mass of a leading K S -pair fragmenting from an energetic gluon jet out of high-statistics three-jet events in hadronic decays of the weak neutral Z boson. Using a physically motivated model of the gluon-glueball fragmentation function, we find a substantial fragmentation rate into a leading glueball. It is very likely that a search, along the lines suggested here by any of the four groups at the Large Electron Positron collider at CERN, will prove fruitful. * probir@theory.tifr.res.in † sridhar@theory.tifr.res.in

Gluonic Meson Production

“…7 More specifically, the production of glueballs in the fragmentation region at large Feynman x has been considered. 8 The search for glueballs applying a rapidity gap selection of events and charge distributions in quark and gluon jets has been suggested recently. 3 There is a well established fragmentation phenomenology for quark jets: a particle which carries the primary quark as valence quark is produced with larger probability at high momentum fraction x than other particles.…”

“…A recent analysis of K K mass spectra at HERA 2 with a prominant peak near the mass of 1700 MeV (presumably f 0 (1710)) has shown the potential for hadron spectroscopy at HERA. In this report we will discuss the recent proposal to search for glueballs in the leading part of the gluon jet 3 and first results 4 (see also discussions in 7,8,9 ), which may be applicable at HERA. Furthermore we report on the possibility for glueball searches and results in B decays.…”

Displaced vertices from hidden glue

“…The choice of β 1 for s 0 is also suggested by the similarity observed between the glueball wave-function and that of the π 0 , as obtained in QCD sum rules [42,43]. This implies that the fragmentation function of a gluon into a glueball is similar to the one of valence quarks into π 0 , as it is pointed out in [44]. The relevant fits to the parametrization (3.4) valid at large x can be found, for instance, in [45], where we see that β 1 correctly reproduces the average multiplicity.…”

Glueballs from gluon jets at the LHC

“…Models of this kind with leading glueballs, but also with leading isoscalars like η, η ′ , ω at large x have been suggested already long ago [10], for x-distributions, see also [11].…”