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Record Id 25549
Title Issues in light hadron spectroscopy
Abstract A high priority in light spectroscopy is to seek out and characterize various types of non-(QQ) meson. The large quantity of new data now appearing will present a great opportunity. To identify the non-(QQ) intruders one needs to know the regular (QQ) pattern well; whole meson families thus become a target for close investigation. A powerful discovery strategy is to observe the same meson in a variety of reactions. Because mesons appear as resonances, other dynamics can distort the signal in a particular decay channel. Unitarity is the master principle for eo- ordinating various sightings of the same resonance. Much of the new spectroscopic information in prospect will come from inferring two-body dynamics from three-body final states. Conventional methods of analysis via the isobar model use approximations to unitarity that need validation. Of all the meson families, the scalars should be a prime hunting ground for non-(QQ)'s. Even before the advent of the new results, some revisions of the 'official' classifications are urged. In particular, it is argued that the lightest broad I=0 scalar is a very broad f0 (1000). One unfinished task is to decide whether f0 (975) and a0 (980) are alike or different; several non-(QQ) scalar scenarios hinge on this. To settle this, much better data on KK channels is needed.
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Language English (EN)
Type Details URI(s) Local file(s) Year
Report C93-09-05.3. 1993. 1993
Report RAL Technical Reports RAL-93-078. 1993. RAL-TR-1993-078.pdf 1993
Presentation Presented at Hadron Structure 93, Banska Stiavnica, Slovakia, 5-10 Sep 1993. 1993
Journal Article Nuovo Cim A 107 (1994): 1883-1902. 1994