V. N. Kolosov

A partial wave analysis of the centrally produced

A partial wave analysis of the centrally produced K+K- and K0K0 channels has been performed in pp collisions using an incident beam momentum of 450 GeV/c. An unambiguous physical solution has been found in each channel. The striking feature is the observation of peaks in the S-wave corresponding to the f0(1500) and fJ(1710) with J = 0. The D-wave shows evidence for the f2(1270)/a2(1320), the f2(1525) and the f2(2150) but there is no evidence for a statistically significant contribution in the D-wave in the 1.7 GeV mass region.A partial wave analysis of the centrally produced K+K- and K0K0 channels has been performed in pp collisions using an incident beam momentum of 450 GeV/c. An unambiguous physical solution has been found in each channel. The striking feature is the observation of peaks in the S-wave corresponding to the f0(1500) and fJ(1710) with J = 0. The D-wave shows evidence for the f2(1270)/a2(1320), the f2(1525) and the f2(2150) but there is no evidence for a statistically significant contribution in the D-wave in the 1.7 GeV mass region.

K^{+}K^{-}

Abstract A study of the f 1 (1285) and f 1 (1420) produced in central pp interactions has been performed. For the first time in a single experiment the branching fractions of both mesons in all major decay modes have been determined. Both the f 1 (1285) and f 1 (1420) are consistent with being produced by double Pomeron exchange.A study of the f1(1285) and f1(1420) produced in central pp interactions has been performed. For the first time in a single experiment the branching fractions of both mesons in all major decay modes have been determined. Both the f1(1285) and f1(1420) are consistent with being produced by double Pomeron exchange.

and

A partial wave analysis of the centrally produced pi+pi- channel has been performed in pp collisions using an incident beam momentum of 450 GeV/c. An unambiguous physical solution has been found. Evidence is found for the f0(980), f0(1300), f0(1500) and fJ(1710) with J = 0 in the the S-wave. The rho(770) is observed dominantly in the P0-wave and the f2(1270) is observed dominantly in the D0-wave. In addition, there is evidence for a broad enhancement in the D-wave below 1 GeV.A partial wave analysis of the centrally produced pi+pi- channel has been performed in pp collisions using an incident beam momentum of 450 GeV/c. An unambiguous physical solution has been found. Evidence is found for the f0(980), f0(1300), f0(1500) and fJ(1710) with J = 0 in the the S-wave. The rho(770) is observed dominantly in the P0-wave and the f2(1270) is observed dominantly in the D0-wave. In addition, there is evidence for a broad enhancement in the D-wave below 1 GeV.A partial wave analysis of the centrally produced pi+pi- channel has been performed in pp collisions using an incident beam momentum of 450 GeV/c. An unambiguous physical solution has been found. Evidence is found for the f0(980), f0(1300), f0(1500) and fJ(1710) with J = 0 in the the S-wave. The rho(770) is observed dominantly in the P0-wave and the f2(1270) is observed dominantly in the D0-wave. In addition, there is evidence for a broad enhancement in the D-wave below 1 GeV.

K^{0}_{s}K^{0}_{s}

The reaction pp ->pf (pi+pi-pi+pi-) ps has been studied at 450 GeV/c in an experiment designed to search for gluonic states. A spin analysis has been performed and the dPT filter applied. In addition to the well known f1(1285) there is evidence for two JPC=2-+ states called the eta2(1620) and eta2(1875) and a broad scalar called the f0(2000). The production of these states as a function of the dPT kinematical filter shows the behaviour expected for qqbar states. In contrast, there is evidence for two states at 1.45 GeV and at 1.9 GeV which do not show the behaviour observed for qqbar states.Abstract The reaction pp → pf(π+ π− π+ π−)ps has been studied at 450 GeV/c in an experiment designed to search for gl states. A spin analysis has been performed and the dPT filter applied. In addition to the well know f1(1285) there is evidence for two JPC = 2−+ states called the η2(1620) and η2(1875) and a broad scalar called the f0(2000). The production of these states as a function of the dPT kinematical filter shows the behaviour expected for q q states. In contrast, there is evidence for two states at 1.45 GeV and at 1.9 GeV which do not show the behaviour observed for q q states.

systems in pp interactions at 450 GeV/c and new information on the spin of the

Abstract A study has been made of pseudoscalar mesons produced centrally in pp interactions. The results show that the η and η′ appear to have a similar production mechanism which differs from that of the π0. The production properties of the η and η′ are not consistent with what is expected from double Pomeron exchange. In addition the production mechanism for the η and η′ is such that the production cross section are greatest when the azimuthal angle between the pT vectors of the two protons is 90 degrees.A study has been made of pseudoscalar mesons produced centrally in pp interactions. The results show that the η and η appear to have a similar production mechanism which differs from that of the π. The production properties of the η and η are not consistent with what is expected from double Pomeron exchange. In addition the production mechanism for the η and η is such that the production cross section are greatest when the azimuthal angle between the pT vectors of the two protons is 90 degrees. Submitted to Physics Letters 1 LAPP-IN2P3, Annecy, France. 2 Athens University, Physics Department, Athens, Greece. 3 Bergen University, Bergen, Norway. 4 School of Physics and Astronomy, University of Birmingham, Birmingham, U.K. 5 CERN European Organization for Nuclear Research, Geneva, Switzerland. 6 IHEP, Protvino, Russia. 7 IISN, Belgium. 8 JINR, Dubna, Russia. 9 High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305, Japan. 10 Faculty of Engineering, Miyazaki University, Miyazaki, Japan. 11 RCNP, Osaka University, Osaka, Japan. 12 Oslo University, Oslo, Norway. 13 Faculty of Science, Tohoku University, Aoba-ku, Sendai 980, Japan. 14 Faculty of Science, Yamagata University, Yamagata 990, Japan.

f_{1}

The reaction pp ! pfps(K + K K + K ) in which the K + K K + K system is centrally produced has been studied at 450 GeV/c. production has been found to dominate this reaction and is compatible with being produced by double Pomeron exchange. An angular analysis of the system favours J PC =2 ++ and its dPT dependence is similar to that observed for glueball candidates.The reaction pp to pfps(K+K-K+K-) in which the K+K-K+K- system is centrally produced has been studied at 450 GeV/c. Phi phi production has been found to dominate this reaction and is compatible with being produced by double Pomeron exchange. An angular analysis of the phi phi system favours JPC = 2++ and its dPT dependence is similar to that observed for glueball candidates.

(1710)

Results are presented of an analysis of the reactions pp ->pf(k0k+pi-)ps and pp ->pf(K0K0pi0)ps at 450 GeV/c. Clear f1(1285) and f1(1420) signals are seen and a spin parity analysis shows that both have IG JPC=0+ 1++. The f1(1285) decays to a0(980)pi and the f1(1420) decays to K* Kbar. Both states have a similar dependence as a function of dPT consistent with what has been observed for other qqbar states. Evidence is also presented for a K*Kbar decay mode of the eta2(1620).Abstract Results are presented of an analysis of the reactions pp → pf(KS0K±π±)ps and pp → pf(KS0KS0π0)ps at 450 GeV/c. Clear f1(1285) and f1(1420) signals are seen and a spin parity analysis shows that both have IGJPC = 0+1++. The f1(1285) decays to a0(980)π and the f1(1420) decays to K ∗ K . Both states have a similar dependence as a function of dPT consistent with has been observed for other q q states. Evidence is also presented for a K ∗ K decay mode of the η2(1620).

A measurement of the branching fractions of the f1(1285) and f1(1420) produced in central pp interactions at 450 GeV/c

The parameters of the Dalitz diagram for the decay η′ → ηπ0π0 in a generalized and a linear representation were determined by using a statistical sample of 15 × 103 events. A charge-exchange reaction at a momentum of 32 GeV/c was a source of monoenergetic η′ mesons. The experiment was performed with the aid of the GAMS-4π spectrometer.

A partial wave analysis of the centrally produced π+π− system in pp interactions at 450 GeV/c

Abstract A partial wave analysis of the centrally produced ηπ 0 and ηπ − channels has been performed in pp collisions using an incident beam momentum of 450 GeV/c. Clear a 0 (980) and a 2 (1320) signals have been observed in S and D + waves respectively. The dP T , φ and | t | distributions of these resonances are presented.

A study of the centrally produced π+π-π+π- channel in pp interactions at 450 GeV/c

X iv :1 30 1. 69 87 v2 [ he pex ] 4 F eb 2 01 3 Measurement of the η − η mixing angle in π and K beams with GAMS-4π Setup S.V. Donskov, V.N. Kolosov, A.A. Lednev, Yu.V. Mikhailov, V.A. Polyakov, V.D. Samoylenko, ∗ and G.V. Khaustov Institute for High Energy Physics, Protvino, Russia The results of mixing angle measurement for η′, η mesons generated in charge exchange reactions with π− and K− beams are preseneted. When the η′, η mesons are described in nonstrange(NS)– strange(S) quark basis the π− and K− beams allow to study |ηq〉 and |ηs〉 parts of the meson wave function. The cross section ratio at t′ = 0 (GeV/c) in the π− beam is Rπ(η ′/η) = 0.56± 0.04 and result in mixing angle φP = (36.8± 1.) . For K− beam the ratio is RK(η ′/η) = 1.30± 0.16. It was found that gluonium content in η′ is sin ψG = 0.15 ± 0.06. The experiment was carried out with GAMS-4π Setup.