Results of search for narrow diproton structures in thepn →ppπ − reaction at 1.98 GeV/c

Abramov, B. M.; Dukhovskoy, I. A.; Fedorets, V.S.; Khanov, A.; Krestnikov, Yu.S.; Krutenkova, A. P.; Kulikov, V.; Matsyuk, M.; Radkevich, I.A.; Starodumov, A.; Sutormin, A.I.

doi:10.1007/bf02907421

Cited by 4 publications

(11 citation statements)

References 11 publications

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“…Troyan include: pn → ppπ − , pn → ppπ − π 0 , pn → ppπ + π − π − , pn → ppπ + π − π − π 0 . We can see from kinematics, and explicit comparison of the data from [4,5] and [30], that the effective mass spectrum is hotter indeed in Abramov's experiment. The Bose-Einstein condensate may not arise at such conditions.…”

Section: Discussionmentioning

confidence: 88%

“…Troyan elaborated one described in [4,5]. We do not know any explicit objections against his method, while the solid line in the main figure of the paper [30] is only an optimal approximation of the experimental invariant mass spectrum containing, in the general case, a sum of background and dibaryon contributions. Therefore, this line cannot be interpreted as the background.…”

Section: Discussionmentioning

confidence: 98%

“…In a paper B.M.Abramov et al [30], an opinion that Troyan's resonances were only fluctuations of background was expressed. In practice, substraction of a background requires a design of special models, and Yu.A.…”

Section: Discussionmentioning

confidence: 99%

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Possible observation of phase transitions in nucleon-nucleon systems

Kostenko¹,

Pribish²

2015

Proceedings of XXII International Baldin Seminar on High Energy Physics Problems — PoS(Baldin ISHEPP XXII)

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A simple condition of deep cooling for observation of phase transitions in compressed fewnucleon systems was recently proposed. Here we have checked it using data obtained in the first physical experiment with accelerated nuclei at JINR synchrophasotron. Our study was inspired by a remark made by A.M. Baldin et al that one of peaks in observed double differential crosssection may arise due to an "excited state of deuterium nucleus". We have established that one of the peaks in the cross-section corresponds indeed to the dibaryon reported by WASA-at-COSY Collaboration. Another peak in the same region may be explained by interference of several usual baryon resonances. Even a more amazing fact has been established in a kinematical regions which were considered till now as a contribution of elastic deuteron-deuteron and nucleon(inside deuteron)-deuteron scattering. More careful calculations have shown that it is not the case. Trying to understand the nature of these peaks we looked over many dibaryons reported by different experimental groups and found that they may be excellently explained in terms of light dibaryons with equidistant mass spectrum observed by Yu.A. Troyan in a very different experiment. A natural explanation of these dibaryons may be given on basis of generalized coherent states discovered by A. Perelomov. These light dibaryons can be an experimental evidence for the pion Bose-Einstein condensate appearance in compressed and cooled nucleon systems. The condensate emerges due to a nonperturbative effect described by Bogoliubov's transformation which produces a pion state beyond the range of the Fock space. It should be also noted that this state of pion field has a mathematical and physical prototype in quantum optics, known there as the squeezed vacuum. Further experimental studies based on modern experimental facilities and more abundant statistics are necessary to verify our conclusions. September 15-20, 2014 JINR, Dubna, Russia * Speaker. . The dashed and dotted curves correspond to approximations of the first two peaks by the Gaussian functions which maxima positions are given in the insertion. XXII International Baldin Seminar on High Energy Physics Problems

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 98%

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Possible observation of phase transitions in nucleon-nucleon systems

Kostenko¹,

Pribish²

2015

Proceedings of XXII International Baldin Seminar on High Energy Physics Problems — PoS(Baldin ISHEPP XXII)

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“…Of course, these arguments can only be considered as indirect evidence in favor of the existence of light dibaryons. On the other hand, it must be emphasized that the criticism of Troyan's experiment presented in [253] also does not look convincing enough. Firstly, in [251] a larger number of events were studied than in [253]; secondly, in [253] , events with a poorer "cooling" of a highly excited dibaryon were used, i.e.…”

Section: Search For New Dibaryons At the Nica Spd Facilitymentioning

confidence: 91%

“…On the other hand, it must be emphasized that the criticism of Troyan's experiment presented in [253] also does not look convincing enough. Firstly, in [251] a larger number of events were studied than in [253]; secondly, in [253] , events with a poorer "cooling" of a highly excited dibaryon were used, i.e. the work is based on events with fewer secondary pions emitted by a highly excited dibaryonic system.…”

Section: Search For New Dibaryons At the Nica Spd Facilitymentioning

confidence: 91%

Possible Studies at the First Stage of the NICA Collider Operation with Polarized and Unpolarized Proton and Deuteron Beams

Abramov

Aleshko²,

Baskov

et al. 2021

Phys. Part. Nuclei

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Nuclotron based Ion Collider fAcility (NICA) project is in progress at the Joint Institute for Nuclear Research and will start experiments with heavy ions. In the context of the NICA Hadronic Physics programme double polarized pp-, dd-and pd-collisions even at lower energies of √ sNN = 3.4 − 10 GeV, which will be accessible already at the initial stage of experiments,are essential tools for precise understanding the spin dependence of the nucleon-nucleon strong interactions, in both elastic and deep-inelastic regimes. A special interest is interaction in few baryon systems at double strangeness, charm and beauty thresholds.For instance, polarized large-angle elastic pp and pn scattering near the charm threshold allows one to get an access to properties of possible exotic multiquark states and their relation to the states recently observed at LHCb.Large angle scattering of protons and deuterons on the deuteron contains unique information on the short-range structure of the deuteron, its non-nucleonic degrees of freedom and also on color transparency phenomenon. Furthermore, double polarized proton-deuteron scattering offer a possibility to test the Standard Model through the search for time-invariance (or CP-invariance under CPT symmetry) violation and parity-violation in single-polarized scattering. This paper contains suggestions for experiments with usage of the Spin Physics Detector (SPD) and discusses perspectives of the first stage of the SPD Programme. This includes experiments with non-polarized beams too as well as collisions like 12 С-12 С and 40 Сa-40 Ca.9 Multiquark correlations and exotic hadron state production 9 9.1 Multiquark correlations and exotic state production at SPD NICA . . . .

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