Spectroscopy of mesons containing light quarks (u, d, s) or gluons

Diekmann, B.

doi:10.1016/0370-1573(88)90062-2

Cited by 46 publications

(26 citation statements)

References 197 publications

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“…These amplitudes are dominated by the ground-state vector resonances ð770Þ and K Ã ð892Þ that are well established as quark-antiquark, QCD bound states that are weakly coupled to the meson-meson continuum. There is also strong experimental evidence for higher mass vector resonances, although precisely how many and to what extent these are related to QCD singlehadron states remains an open issue [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 98%

Amplitudes for the analysis of the decayJ/ψ→K+K−π0

et al. 2012

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We construct an analytical model for two-channel, two-body scattering amplitudes, and then apply it in the description of the three-body J=c ! K þ K À 0 decay. In the construction of the partial wave amplitudes, we combine the low-energy resonance region with the Regge asymptotic behavior determined from direct two-body production. We find that resonance production in the K channel in J=c decays seems to differ from that observed in direct K production, while the mass distribution in the K " K channel may be compatible.

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Section: Introductionmentioning

confidence: 98%

Amplitudes for the analysis of the decayJ/ψ→K+K−π0

et al. 2012

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“…The masses of the Goldstone bosons are generated by the spontaneous breaking of chiral symmetry [2,6,16]. The η ′ meson is, therefore, thought to couple strongly to gluons via the U A (1) axial anomaly coupling [17,18]. The unexpectedly large branching ratio measured recently for the inclusive decay of beauty particles, B → η ′ + X [19], has been interpreted as possible experimental evidence in this respect [20].…”

Section: Introductionmentioning

confidence: 99%

Consistent analysis of the reactionsγp→pη′andpp→ppη′
Nakayama
¹
,
Haberzettl
²

2004
Phys. Rev. C
37
2
75
1
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The production of η ′ mesons in the reactions γp → pη ′ and pp → ppη ′ is described consistently within a relativistic meson exchange model of hadronic interactions. The photoproduction can be described quite well over the entire energy range of available data by considering an S11 and a P11 resonance, in addition to the t-channel mesonic current. The observed angular distribution is due to the interference between the t-channel and the nucleon resonance s-and u-channel contributions. Our analysis yields positions close to 1650 MeV and 1870 MeV for the S11 and P11 resonances, respectively. We argue that, at present, identifying these states with the known S11(1650) resonance and the missing P11 resonance predicted at 1880 MeV, respectively, would be premature. It is found that the nucleonic current is relatively small and that the N N η ′ coupling constant cannot be much larger than g NNη ′ = 3. As for the pp → ppη ′ reaction, different current contributions are constrained by a combined analysis of this and the photoproduction reaction. Difficulties to simultaneously account for the 47-MeV and 144-MeV angular distributions measured by the COSY-11 and DISTO collaborations, respectively, are addressed.

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“…Rho-GAP was purified from human spleen as described in [29] and the recombinant C-terminal bcrGAP (rac-GAP) protein was prepared as in [30]; these two proteins were provided by Dr A. Hall.…”

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confidence: 99%

GTPase activity of small GTP‐binding proteins in HL‐60 membranes is stimulated by arachidonic acid

Ligeti

Pizon²,

Wittinghofer

et al. 1993

European Journal of Biochemistry

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The GTPase activity of membranes isolated from differentiated HL-60 cells was investigated to obtain information about the possible involvement of membrane-bound GTP-binding proteins in the regulation of the NADPH oxidase. A more than tenfold increase in the rate of hydrolysis of membrane-bound GTP was observed when cytosol and arachidonic acid were added simultanously, i.e. under the same conditions where NADPH oxidase becomes activated. There were parallel changes in GTPase and NADPH oxidase activities when the concentration of arachidonic acid or the species of the fatty acid was varied or different detergents were applied. Separation of the GTP-binding proteins of the solubilized membrane by sucrose density gradient centrifugation, allowed us to ascribe the observed effect to the stimulation of the GTPase activity of small GTP-binding proteins by cytosolic component(s). Indirect evidence suggests that, in contrast to the effect upon recombinant ras and ras-GTPase-activating protein, in intact HL-60 membranes the interaction of rapl A with rap-GTPase-activating protein, is strongly enhanced by arachidonic acid.In resting phagocytosing cells, the superoxide (0, -)-producing NADPH oxidase is present in a dormant state. Following various stimulations, the active enzyme is rapidly assembled from the membrane-bound component cytochrome b,,, and two proteins of cytosolic origin, p47,,,,, and ~6 7 ,~, , [l, 21. Association of p47,,,, and p67,,, with the plasma membrane has been demonstrated both in intact cells [3-51 and in the in-vitru-activation system [6, 71. Using in vitro conditions, the prerequisite for the translocation is the presence of a suitable amphiphilic molecule, such as SDS or arachidonic acid [8-lo].Activation of the NADPH oxidase has been shown to be enhanced by GTP and poorly hydrolyzable GTP analogs and to be inhibited by GDP and its poorly hydrolyzable analog [ll-131. These findings suggested the participation of a GTP-binding protein in the process. Convincing evidence has been published recently by three different groups [14-171 that rac, a small GTP-binding protein, is the third cytosolic factor necessary for the activation of the oxidase and that it is responsible for the GTP dependence of the process. These results have been elegantly supported by the successful reconstitution of the fully active NADPH oxidase enzyme from purified cytochrome b,,, and recombinant p47ph,,, ~6 7~, , , , and racl [19].Another small GTP-binding protein, rapl A, has been reported to be firmly associated to cytochrome b,,, both in the plasma membrane and the specific granule membranes. TheCorrespondence to E. Ligeti two proteins could be co-immunopurified with antibodies against either of them [20, 211. Phosphorylation of raplA by CAMP-dependent protein kinase was shown to prevent its specific association with cytochrome b,,, [22]. Earlier experiments indicated that stimuli resulting in an increase in the intracellular CAMP concentration inhibit 0; -production [23, 241. All these data indicate a possible involvem...

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Spectroscopy of mesons containing light quarks (u, d, s) or gluons

Cited by 46 publications

References 197 publications

Amplitudes for the analysis of the decayJ/ψ→K+K−π0

Amplitudes for the analysis of the decayJ/ψ→K+K−π0

Consistent analysis of the reactionsγp→pη′andpp→ppη′
Nakayama
¹
,
Haberzettl
²

2004
Phys. Rev. C
37
2
75
1
View full text Add to dashboard Cite

GTPase activity of small GTP‐binding proteins in HL‐60 membranes is stimulated by arachidonic acid

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Spectroscopy of mesons containing light quarks (u, d, s) or gluons

Cited by 46 publications

References 197 publications

Amplitudes for the analysis of the decayJ/ψ→K+K−π0

Amplitudes for the analysis of the decayJ/ψ→K+K−π0

Consistent analysis of the reactionsγp→pη′andpp→ppη′Nakayama1, Haberzettl2 2004Phys. Rev. C372751View full textAdd to dashboardCite

GTPase activity of small GTP‐binding proteins in HL‐60 membranes is stimulated by arachidonic acid

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About

Consistent analysis of the reactionsγp→pη′andpp→ppη′
Nakayama
¹
,
Haberzettl
²

2004
Phys. Rev. C
37
2
75
1
View full text Add to dashboard Cite