The Search and Study of Low-Mass Scalar Mesons in the Reaction np --> np Pi+Pi- at Pn = 5.20 Gev/c^2

Details The Search and Study of Low-Mass Scalar Mesons in the Reaction np --> np Pi+Pi- at Pn = 5.20 Gev/c^2 The Search and Study of Low-Mass Scalar Mesons in the Reaction np --> np Pi+Pi- at Pn = 5.20 Gev/c^2

2008-11-25

arxiv.org/abs/0811.4078v2

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages, 11 figures, 4 tables; Presented at XIX ISHEPP (JINR, Dubna, Russia, September, 2008). English version of JINR prepr.

Scientific paper

Using irradiation of a 1-meter Hydrogen Bubble Chamber (LHE JINR) by a quasimonochromatic neutron beam with impulse Pn=(5.20 +/- 0.12)GeV/c produced after acceleration of deuterons in the synchrophasotron (LHE JINR) 2560 events of reaction np-->npPi+Pi- were selected. After supplementary sorting out the events where a secondary proton flies forward in the general c.m.s. of reaction in the effective mass spectrum of Pi+Pi- - combinations, there were nine peculiarities found out at masses 350, 408, 489, 579, 676, 762, 878, 1036, 1170 MeV/c^2 with experimental widths not more than several tens of MeV/c^2. The resonance effects grow too much after using an additional criterion - balance of the sum of the longitudinal impulse of Pi+ and Pi--mesons in the general c.m.s. of the reaction. Under these conditions the values of a standard derivation from the background are (5 - 7.5). The direct measurement of the spin of resonances was carried out. Also other quantum numbers were obtained. All of these peculiarities have a similar set of quantum numbers I^G(J^(PC))=0+(0++). This way the sequence of scalar-izoscalar resonances f0(SIGMA0) with masses in the range of M

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