Abashian-Booth-Crowe resonance structure in the double pionic fusion to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>4</mml:mn></mml:msup></mml:math>He

Adlarson, P.; Augustyniak, W.; Bardan, W.; Bashkanov, M.; Bednarski, T.; Bergmann, F. S.; Berłowski, M.; Bhatt, H.; Brinkmann, K.-Th.; Buescher, M.; Calén, H.; Clement, H.; Coderre, D.; Czerwiński, E.; Demmich, K.; Doroshkevich, E.; Engels, R.; Erven, W.; Eyrich, W.; Fedorets, P.; Foehl, K.; Fransson, K.; Goldenbaum, F.; Goslawski, P.; Grigoryev, K.; Gullström, C.–O.; Hauenstein, F.; Heijkenskjöld, L.; Hejny, V.; Hinterberger, F.; Hodana, M.; Höistad, B.; Husmann, C.; Jany, A.; Jany, Benedykt R.; Jarczyk, L.; Johansson, T.; Kamys, B.; Kemmerling, G.; Khan, Farha; Khoukaz, A.; Kistryn, S.; Klaja, J.; Kleines, H.; Kłos, B.; Krzemień, W.; Kulessa, P.; Kupść, A.; Lalwani, K.; Lersch, D.; Li, L.; Lorentz, B.; Magiera, A.; Maier, R.; Marciniewski, P.; Mariański, B.; Mikirtychiants, M.; Morsch, H. P.; Moskal, P.; Nandi, B. K.; Niedźwiecki, Szymon; Ohm, H.; Ozerianska, I.; Pauly, C.; Río, E. Pérez del; Petukhov, Y.; Pluciński, P.; Podkopał, P.; Prasuhn, D.; Pricking, A.; Pszczel, D.; Pysz, K.; Pyszniak, A.; Redmer, C. F.; Ritman, J.; Roy, A.; Rudy, Z.; Sawant, S.; Schadmand, S.; Schmidt, Axel; Serdyuk, V.; Shah, Nausheen R.; Siudak, R.; Skorodko, T.; Skurzok, M.; Smyrski, J.; Sopov, V.; Stassen, R.; Steṕaniak, J.; Sterzenbach, G.; Stockhorst, H.; Stroeher, H.; Szczurek, Antoni; Tolba, T.; Trzciński, A.; Varma, R.; Vlasov, P.; Wagner, G. J.; Wȩglorz, W.; Wolke, M.; Wrońska, A.; Wuestner, P.; Wurm, P.; Yamamoto, A.; Yuan, X.; Yurev, L.; Zabierowski, J.; Zheng, C.; Zieliński, Marcin; Zipper, W.; Złomańczuk, J.; Żuprański, P.

doi:10.1103/physrevc.86.032201

Cited by 34 publications

(22 citation statements)

References 22 publications

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“…2. The WASA measurements of two-pion production in the np → dπ 0 π 0 reaction [185,186,188,195] have had an electrifying influence on the whole field because of the evidence for the production of an isoscalar dibaryon resonance. 3.…”

Section: Discussionmentioning

confidence: 99%

“…This is not unexpected if both are driven by the ∆∆ intermediate state. The ABC effect is seen also in pd → 3 He π 0 π 0 and, most spectacularly, in dd → 4 He π 0 π 0 [194,195]. However, in the dd case the cross section and deuteron tensor analyzing power have been described using conventional physics without the need for the d * (2380) [196].…”

Section: Two-pion Production In Neutron-proton Collisionsmentioning

confidence: 99%

“…10 The dd → 4 HeX 0 family of reactions Meson production rates in the dd → 4 He X 0 reaction are expected to be very low because two deuterons, with mean diameters of about 4 fm, have to be squeezed to form the much smaller α-particle. An exception is the dd → 4 He π + π − reaction [195], but there may be special reasons for this [196]. However, the rates are often disappointingly low as, for example, in the search for evidence for the production of the f 0 meson in the dd → 4 He K + K − reaction [319].…”

Section: 3mentioning

confidence: 99%

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The legacy of the experimental hadron physics programme at COSY

Wilkin¹

2017

Eur. Phys. J. A

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Section: Discussionmentioning

confidence: 99%

Section: Two-pion Production In Neutron-proton Collisionsmentioning

confidence: 99%

Section: 3mentioning

confidence: 99%

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The legacy of the experimental hadron physics programme at COSY

Wilkin¹

2017

Eur. Phys. J. A

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“…Such experiments are planned to be done at CB@MAMI, JLab and could be performed at several other facilities, like FAIR@GSI. An exploratory study was also performed at WASA [17]. ‡ Due to the isoscalar nature of the d * (2380), isovector meson exchanges (e.g.…”

Section: Estimates Of D * (2380)-bec Stabilitymentioning

confidence: 99%

A new possibility for light-quark dark matter

Bashkanov¹,

Watts²

2020

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

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Despite many decades of study the physical origin of "dark matter" in the Universe remains elusive. In this letter we calculate the properties of a completely new dark matter candidate -Bose-Einstein condensates formed from a recently discovered bosonic particle in the light-quark sector, the d * (2380) hexaquark. In this first study, we show stable d * (2380) Bose-Einstein condensates could form in the primordial early universe, with a production rate sufficiently large that they are a plausible new candidate for dark matter. Some possible astronomical signatures of such dark matter are also presented.

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“…Since the resonance Λ (1405) exists inKN channel,KN N -Λ (1405) N -πΣN two-body and three-body coupled-channels effect regarding Λ (1405) as a compact qqq baryon might play an important role in understanding the system. Existence of non-strange dibaryons was first discussed in the 60's [35,36], however it is only recent that they are actually observed experimentally [37][38][39][40][41][42][43]. The importance of hadronic two-body and three-body coupled-channels analysis in these channels has also been discussed [44,45].…”

Section: Introductionmentioning

confidence: 99%

Degenerate two-body and three-body coupled-channels systems: Renormalized effective Alt-Grassberger-Sandhas equations and near-threshold resonances

2018

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Motivated by the existence of candidates for exotic hadrons whose masses are close to both of two-body and three-body hadronic thresholds lying close to each other, we study degenerate two-body and three-body coupled-channel systems. We first formulate the scattering problem of non-degenerate two-body and three-body coupled-channels as an effective three-body problem, i.e. effective Alt-Grassberger-Sandhas (AGS) equations. We next investigate the behavior of S-matrix poles near the threshold when two-body and three-body thresholds are degenerate. We solve the eigenvalue equations of the kernel of AGS equations instead of AGS equations themselves to obtain the S-matrix pole energy. We then face a problem of unphysical singularity: though the physical transition amplitudes have physical singularities only, the kernel of AGS equations have unphysical singularities. We show, however, that these unphysical singularities can be removed by appropriate reorganization of the scattering equations and mass renormalization. The behavior of S-matrix poles near the degenerate threshold is found to be universal in the sense that the complex pole energy, E, is determined by a real parameter, c, as c + E log (−E) = 0, or equivalently, Im E = πRe E/ log (Re E). This behavior is different from that of either two-body or three-body system and is characteristic in the degenerate two-body and three-body coupled-channel system. We expect that this new class of universal behavior might play a key role in understanding exotic hadrons.

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Abashian-Booth-Crowe resonance structure in the double pionic fusion to4He

Cited by 34 publications

References 22 publications

The legacy of the experimental hadron physics programme at COSY

The legacy of the experimental hadron physics programme at COSY

A new possibility for light-quark dark matter

Degenerate two-body and three-body coupled-channels systems: Renormalized effective Alt-Grassberger-Sandhas equations and near-threshold resonances

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