Is there an <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>η</mml:mi><mml:mspace width="0.2em"/><mml:mmultiscripts><mml:mi mathvariant="normal">He</mml:mi><mml:mprescripts/><mml:none/><mml:mn>3</mml:mn></mml:mmultiscripts></mml:math> quasi-bound state?

Wilkin, C.; Büscher, M.; Chiladze, D.; Dymov, S.; Hanhart, C.; Hartmann, Michael; Hejny, V.; Kacharava, A.; Keshelashvili, I.; Khoukaz, A.; Maeda, Yoshikazu; Mersmann, T.; Mielke, M.; Mikirtychiants, S.; Papenbrock, M.; Rathmann, F.; Rausmann, T.; Schleichert, R.; Ströher, H.; Täschner, A.; Valdau, Yu.; Wrońska, A.

doi:10.1016/j.physletb.2007.08.041

Cited by 58 publications

(59 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The presence of such a pole is also reflected in the rapid rise in the total cross section of the γ 3 He → η 3 He reaction [180]. The angular distributions for producing the η 3 He system in dp or γ 3 He collisions also show anomalous behaviour near threshold [256,180] that are consistent with the pole hypothesis.…”

Section: Real η Productionsupporting

confidence: 52%

“…40 assuming a constant s-wave phase does not allow α to go negative but, if the phase variation with p η determined by Eq. (6.3) is taken into account then one can reproduce much better the shape of the α measurements [256]. Therefore it seems that the pole hypothesis in the s-wave production amplitude is on quite firm foundations.…”

Section: Near-threshold Datamentioning

confidence: 96%

“…(6.1) measured at COSY-11 [182] (red open symbols) and COSY-ANKE [181] (blue closed symbols). Also shown are the fits to the ANKE data with (solid black line) and without (dashed magenta line) taking the s-wave phase variation into account [256].…”

Section: Near-threshold Datamentioning

confidence: 99%

See 2 more Smart Citations

Production of η and η′ mesons on nucleons and nuclei

Krusche¹,

Wilkin²

2015

Progress in Particle and Nuclear Physics

Self Cite

View full text Add to dashboard Cite

The production of η and η mesons in photon-and hadron-induced reactions on free and quasifree nucleons and on nuclei is reviewed. The extensive database on γN → ηN , for both proton and neutron targets, is described in detail and its implications for the search for N resonances much heavier than the dominant S 11 (1535) discussed. Though less is currently known about the production of the η or of ηπ pairs, these also offer tantalizing prospects in the search for the missing isobars. The more limited data available on pion-induced production are still necessary ingredients in the partial wave analysis discussed.The production of the η-meson in pp and pn collisions shows once again the strong influence of the S 11 (1535) isobar, which is in contrast to the relatively weak behaviour seen near threshold for η production. This difference is reflected in the important final state interaction effects of the η in nuclei that may even lead to this meson being "bound" in some systems. The evidence for this is reviewed for both γA and pA collisions. The inclusive photoproduction of η, η , and ηπ pairs from nuclei provides further information regarding the production mechanism and the interaction of the η and η with nuclei and the ηπ pairs may even allow access to low mass ηA systems that are forbidden in direct single-meson photoproduction.

show abstract

Section: Real η Productionsupporting

confidence: 52%

Section: Near-threshold Datamentioning

confidence: 96%

See 1 more Smart Citation

Production of η and η′ mesons on nucleons and nuclei

Krusche¹,

Wilkin²

2015

Progress in Particle and Nuclear Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…In Ref. [75] it was argued that the rapid change in size of the cross section is due to FSI in the s wave and not to fast changes in the p waves which were believed to vary smoothly. With the assumptions A = B = f s and C = D the cross section and the asymmetry parameter α reduce to…”

Section: The Reaction D + P → 3 He+ηmentioning

confidence: 99%

Search for quasi boundηmesons

Machner

2015

J. Phys. G: Nucl. Part. Phys.

View full text Add to dashboard Cite

The search for a quasi bound η meson in atomic nuclei is reviewed. This tentative state is studied theoretically as well as experimentally. The theory starts from elastic η nucleon scattering which is derived from production data within some models. From this interaction the η nucleus interaction is derived. Model calculations predict binding energies and widths of the quasi bound state. Another method is to derive the η nucleus interaction from excitation functions of η production experiments. The s wave interaction is extracted from such data via final state interaction theorem. We give the derivation of s wave amplitudes in partial wave expansion and in helicity amplitudes and their relation to observables. Different experiments extracting the final state interaction are discussed as are production experiments. So far only three experiments give evidence for the existence of the quasi bound state: a pion double charge exchange experiment, an effective mass measurement, and a transfer reaction at recoil free kinematics with observation of the decay of the state.

show abstract

“…The data analysis is in progress. In parallel to the experimental investigations, several theoretical studies are ongoing [53,[62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77].…”

Section: Perspectivesmentioning

confidence: 99%

Recent Results from WASA-at-COSY

Clement¹,

Moskal²,

Skurzok³

2017

Proceedings of the 14th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU2016)

View full text Add to dashboard Cite

The detector system WASA-at-COSY has been operated at the Cooler Synchrotron COSY in the years from 2006 till 2015. In this article we report on recent results of the analyses of the meson production reactions in nucleon-nucleon, nucleon-deuteron and deuteron-deuteron collisions with spin-polarized and unpolarized beams emphasizing the evidences for the existence of the dibaryon state in the proton-neutron system and the perspectives for the search of the η-mesic helium.

show abstract

Is there an ηHe3 quasi-bound state?

Cited by 58 publications

References 17 publications

Production of η and η′ mesons on nucleons and nuclei

Production of η and η′ mesons on nucleons and nuclei

Search for quasi boundηmesons

Recent Results from WASA-at-COSY

Contact Info

Product

Resources

About