Searching for the Scalar Glueball

@misc{citeulike:2773586, abstract = {Existence of gluonic resonances is among the early expectations of QCD. Today, QCD calculations predict the lightest glueball to be a scalar state with mass within a range of about 900-1700 MeV but there is no consensus about its experimental evidence. In a re-analysis of the phase shifts for pi pi scattering up to 1800 MeV where such states should show up we find the broad resonance f\_0(600)/\sigma contributing to the full mass range and the narrow f\_0(980) and f\_0(1500) but no evidence for f\_0(1370). Phenomenological arguments for the broad state to be a glueball are recalled. It is argued that the large radiative width of f\_0(600)/\sigma reported recently is not in contradiction to this hypothesis but is mainly due to pi pi rescattering. The small ``direct'' radiative component is consistent with QCD sum rule predictions for the light glueball.}, author = {Ochs, Wolfgang }, citeulike-article-id = {2773586}, eprint = {0805.0997}, keywords = {glueballs, hep, nonperturbative, physics, qcd}, month = {May}, posted-at = {2008-05-08 22:08:05}, priority = {2}, title = {Searching for the Scalar Glueball}, url = {http://arxiv.org/abs/0805.0997}, year = {2008} }

TY - ELEC ID - citeulike:2773586 L3 - citeulike-article-id:2773586 TI - Searching for the Scalar Glueball N2 - Existence of gluonic resonances is among the early expectations of QCD. Today, QCD calculations predict the lightest glueball to be a scalar state with mass within a range of about 900-1700 MeV but there is no consensus about its experimental evidence. In a re-analysis of the phase shifts for pi pi scattering up to 1800 MeV where such states should show up we find the broad resonance f_0(600)/\sigma contributing to the full mass range and the narrow f_0(980) and f_0(1500) but no evidence for f_0(1370). Phenomenological arguments for the broad state to be a glueball are recalled. It is argued that the large radiative width of f_0(600)/\sigma reported recently is not in contradiction to this hypothesis but is mainly due to pi pi rescattering. The small ``direct'' radiative component is consistent with QCD sum rule predictions for the light glueball. KW - glueballs KW - hep KW - nonperturbative KW - physics KW - qcd AU - Ochs, Wolfgang PY - 2008/May/07/ UR - http://arxiv.org/abs/0805.0997 ER -