Observation of structures in the mass range of 2700 to 2900 MeV in the difference between the<i>pp</i>total cross sections for pure helicity states

Auer, I.P.; Colton, E.; Ditzler, W. R.; Halpern, Howard J.; Hill, D.; Miller, Robert C.; Spinka, H.; Tamura, N.; Tavernier, Jean-Baptiste; Theodosiou, G.; Toshioka, K.; Underwood, D. G.; Wagner, R. G.; Yokosawa, A.

doi:10.1103/physrevlett.62.2649

Cited by 19 publications

(8 citation statements)

References 20 publications

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“…Previous experience with the nucleonnucleon system [4,7] has shown that the MIT bag model is not consistent with two-hadron data. On the other hand, the cloudy bag model (CBM) is consistent with the available data, and predicts exotic structures in the region W=2.6-3.0 GeV for which there is some evidence [6,7,14]. The nucleon-nucleon data also indicated that R o -0.…”

Section: Ar Osupporting

confidence: 70%

ΛN−ΣNinteraction with isobar coupling and six-quark resonances

Greenberg¹,

Lomon²

1993

Phys. Rev. D

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The long-range A N -B N interaction is modeled by a configuration-space meson-exchange potential matrix coupling to channels with A and H(1385) isobars. An inner boundary condition, based on R-matrix theory, replaces form factors for short-range effects and includes the effects of free quark configurations. An excellent fit is obtained to the available data, with only the energy-independent boundary conditions as free parameters. The effect of isobar thresholds is shown to be substantial in several partial waves and is crucial to the understanding of the higher-energy A N elastic scattering data. The positions and widths of [q( ls,/> )I5s ( ls1/> ) quark exotics are predicted. PACS numbeds): 13.75. Ev, 12.40.Aa, 12.40.Qq

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Section: Ar Osupporting

confidence: 70%

ΛN−ΣNinteraction with isobar coupling and six-quark resonances

Greenberg¹,

Lomon²

1993

Phys. Rev. D

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“…In that time, the first experimental indications appeared for existence of the number of dibaryon states. In particular, in elastic scattering of polarized protons p + p, the signals of a whole series of isovector dibaryons in 1 D 2 , 3 F 3 , 1 G 4 , etc., partial waves were found [8,9,10] (see also later experimental works [11,12,13]). Besides that, rather convincing though indirect indications for an isoscalar dibaryon with quantum numbers I(J P ) = 0(3 + ) were found in measurements of the outgoing proton polarisation in the deuteron photodisintegration process γd → pn at energies E γ ≃ 400-600 MeV [14,15,16].…”

Section: Introduction: Dibaryons Are "To Be or Not To Be"?mentioning

confidence: 73%

Hidden dibaryons in one- and two-pion production in NN collisions

Platonova

Kukulin

2016

Nuclear Physics A

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Processes of one-and two-pion production in NN collisions are considered in connection with excitation of intermediate dibaryon resonances. In particular, relative contributions of the conventional meson-exchange and dibaryon excitation mechanisms in the reaction pp → dπ + are investigated in detail. Inclusion of the intermediate isovector dibaryon resonances is shown to essentially improve the description of experimental data for this reaction, provided the soft meson-baryon form factors consistent with πN elastic scattering are used. Manifestation of the intermediate isoscalar and isovector dibaryons in the two-pion production processes is also studied. The role of the isovector dibaryon resonances in the reaction pp → ppππ is discussed for the first time. An explanation of the observed strong differences between two-pion production cross sections in pn and pp collisions based in part on the analysis of dibaryon structure is suggested.

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“…The activity in searching for dibaryon resonances in 1980s was motivated by the success of MIT-bag models in prediction of dibaryon states [1][2][3]. Numerous experiments on p p elastic scattering done at the same time revealed possible existence of a series of diproton resonances with masses in the range 2.1-2.9 GeV and total widths 100-200 MeV [4][5][6][7][8].…”

Section: Introduction Brief Historical Excursusmentioning

confidence: 99%

Manifestation of theP-wave diproton resonance in single-pion production inppcollisions

Platonova¹,

Kukulin²

2016

Phys. Rev. D

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It is demonstrated that many important features of single-pion production in pp collisions at intermediate energies (T p ≃ 400-800 MeV) can naturally be explained by supposing excitation of intermediate diproton resonances in pp channels 1 D 2 , 3 F 3 and 3 P 2 , in addition to conventional mechanisms involving an intermediate ∆-isobar. We predict for the first time the crucial role of the 3 P 2 diproton resonance, found in recent experiments on the single-pion production reaction pp → pp( 1 S 0 )π 0 , in reproducing the proper behavior of spin-correlation parameters in the reaction pp → dπ + which were poorly described by conventional meson-exchange models to date. The possible quark structure of the P -wave diproton resonances is also discussed.

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Observation of structures in the mass range of 2700 to 2900 MeV in the difference between thepptotal cross sections for pure helicity states

Cited by 19 publications

References 20 publications

ΛN−ΣNinteraction with isobar coupling and six-quark resonances

ΛN−ΣNinteraction with isobar coupling and six-quark resonances

Hidden dibaryons in one- and two-pion production in NN collisions

Manifestation of theP-wave diproton resonance in single-pion production inppcollisions

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