A. V. Sarantsev

Observation of two JPC=0++ isoscalar resonances at 1365 and 1520 MeV

From a simultaneous analysis of data on pp → π0π0π0 and pp → ηηπ0 at rest, two I = 0, JPC = 0++ resonances are identified above 1 GeV. The first has mass M = 1365−55+20 MeV and width г = 268 ± 70 MeV, close to the ƒ0(1400) of the Particle Data Group. The second has M = 1520 ± 25 MeV, г = 148−25+20 MeV.

Further amplitude analysis of JΨ → γ(π+π−π+π−)

Abstract Mark III data on J Ψ → γ(π + π − π + π − ) have been re-analysed including γσσ final states as well as γϱϱ. Here σ stands for the ππ S-wave amplitude. We fit with I = 0 resonances having JPC = 2++ at 1275 MeV, 0−+ at 1420 MeV, 0++ at 1505 MeV, 2++ at 1640 MeV, 0++ at 1750 MeV and 0++ at 2104 MeV. The 0++ resonances decay dominantly to σσ and the 2++ resonances to ϱϱ.

Observation of a new IG(JPC)=1−(0++) resonance at 1450 MeV

Abstract A new IG=1− JPC=0++πη resonance is observed in pp annihilation at rest into π0π0η. It has a mass M=(1450±40)MeV and a width Γ=(270±40)MeV.

Nonet classification of scalar/isoscalar resonances below 1900 MeV: the existence of an extra scalar state in the region 1200–1600 MeV

Abstract A classification of the IJ PC = 00 ++ mesons is performed on the basis of the K -matrix analysis of meson spectra in the reactions: (i) GAMS data on πp → π 0 π 0 n , ηηn , ηη ′ n [D. Alde et al., Z. Phys. C 66 (1995) 375; A.A. Kondashov et al., Proc. 27th Intern. Conf. on High Energy Physics, Glasgow (1994) 1407; Yu.D. Prokoshkin et al., Physics-Doklady 342 (1995) 473; A.A. Kondashov et al., Preprint IHEP 95-137, Protvino (1995); F. Binon et al., Nuovo Cim. A 78 (1983) 313; A 80 (1984) 363]; (ii) Crystal Barrel data on p p ( at rest ) → π 0 π 0 π 0 , π 0 π 0 η, π 0 ηη [V.V. Anisovich et al., Phys. Lett. B 323 (1994)233; C. Amsler et al., Phys. Lett. B 342 (1995) 433]; (iii) CERN-Munich data on πp → π + π − n [B. Hyams et al., Nucl. Phys. B 64 (1973) 134]; (iv) BNL data on πN → K K N [S.J. Lindenbaum and R.S. Longacre, Phys. Lett. B 274 (1992) 492; A. Etkin et al., Phys. Rev. D 25 (1982) 1786]. The analysis points to the existence of four comparatively narrow scalar resonances which correspond to the following poles of the scattering amplitude (in MeV): (1015 ± 15) − i (43 ± 8), (1300 ± 20) − i (120 ± 20), (1499 ± 8) − i (65 ± 10) and (1780 ± 30) − i (125 ± 70). The scattering amplitude also has a fifth pole f 0 (1530 −250 +90 ) at the complex mass (1530 −250 +90 − i (560 ± 140). The masses of the K -matrix poles (bare states) are at 720±100 MeV, 1230±50 MeV, 1260±30 MeV, 1600±50 MeV and 1810±30 MeV. The quark content of the bare states is analyzed using the values of their couplings to the ππ, K K , ηη and ηη′. It is shown that one of the bare states in the mass region 1200–1600 MeV is superfluous for the q q classification and should be considered as the lightest glueball.

Further amplitude analysis of J / psi ---> gamma (pi+ pi- pi+ pi-)

Abstract Mark III data on J Ψ → γ(π + π − π + π − ) have been re-analysed including γσσ final states as well as γϱϱ. Here σ stands for the ππ S-wave amplitude. We fit with I = 0 resonances having JPC = 2++ at 1275 MeV, 0−+ at 1420 MeV, 0++ at 1505 MeV, 2++ at 1640 MeV, 0++ at 1750 MeV and 0++ at 2104 MeV. The 0++ resonances decay dominantly to σσ and the 2++ resonances to ϱϱ.

Determination of hadronic partial widths for scalar-isoscalar resonances f 0(980), f 0(1300), f 0(1500), f 0(1750) and the broad state f 0(1530 −250 +90 )

Recently [see V.V. Anisovich et al., Yad. Fiz. 63, 1489 (2000)], the K-matrix solutions for the wave IJPC=00++ were obtained in the mass region 450–1900 MeV, where four resonances f0(980), f0(1300), f0(1500), f0(1750) and the broad state f0(1530−250+90) are located. Based on these solutions, partial widths are determined for scalar-isoscalar states decaying into the channels ππ, KKηη, ηη′, ππππ and corresponding decay couplings.

Quark-antiquark states and their radiative transitions in terms of the spectral integral equation: Charmonia

AbstractEarlier by the authors (Yad. Fiz. 70, 68 (2007)), the bƃ states were treated in the framework of the spectral integral equation, together with simultaneous calculations of radiative decays of the considered bottomonia. In the present paper, such a study is carried out for the charmonium % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfKttLearuqr1ngBPrgarmWu51MyVXgatC% vAUfeBSjuyZL2yd9gzLbvyNv2CaeHbd9wDYLwzYbItLDharyavP1wz% ZbItLDhis9wBH5garqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbb% L8F4rqqrFfpeea0xe9Lq-Jc9vqaqpepm0xbba9pwe9Q8fs0-yqaqpe% pae9pg0FirpepeKkFr0xfr-xfr-xb9adbaqaaeGaciGaaiaabeqaam% aaeaqbaaGcbaGaeiikaGIaem4yamMafm4yamMbaebacqGGPaqkaaa!3F33!

Quark-gluonium content of the scalar-isoscalar states f 0(980), f 0(1300), f 0(1500), f 0(1750), and f 0(1420 −70 +150 ) from hadronic decays

(c\bar c)