| A High Resolution Search for the Tensor (2008) | |||||||||||||
Abstract | |||||||||||||
| We report results of a high resolution search for the tensor glueball candidate #(2230) in a pp formation experiment. # and ## decay channels were measured in a scan of the mass region 2220 MeV to 2240 MeV. No evidence for the existence of #(2230) was found. 95% confidence upper limits for the possible existence of # are presented. As soon as the non-Abelian nature of the quark-gluon field theory, which we now call Quantum Chromodynamics (QCD), was recognized in 1972, Fritzsch and Gell-Mann [1] predicted that "there must exist glue states in hadron spectrum", and in 1975 Fritzsch and Minkowski [2] presented a detailed discussion of the phenomenology of the spectrum of 'glue states', which we now call 'glueballs'. It was pointed out that the color singlet states of two gluons should have the same quantum numbers as states of the two-photon system, i.e., J = 2n , (2n + 1) , and 2n -+ , with n = 0, 1, 2, ..; and the order of the masses of the lowest lying states should be 0 , 2 , 0 -+ ,... . Since then, numerous calculations of glueball spectra have been made in various physical models [3], and they all bear out the essential features of these twenty-five year old predictions. For example, one of the most sophisticated lattice-gauge calculations (which are still made in the quenched approximation) predicts glueball masses, M(0 1730 80 MeV, M(2 2400 25 120 MeV [4]. Most recent experimental e#orts have been directed to the search and identification of these two, the scalar and the tensor glueballs [5]. In this letter we present the results of a high resolution search for the 2 tensor glueball in a pp annihilation experiment, PS197, made with the Crystal Barrel detector [6] at the LEAR facility at CERN. | |||||||||||||
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