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SUMMARY:The reactions  pd → pdππ   and dd → ddππ and dibaryon reso
 nances
DTSTART;VALUE=DATE-TIME:20261029T144500Z
DTEND;VALUE=DATE-TIME:20261029T150500Z
DTSTAMP;VALUE=DATE-TIME:20261023T102338Z
UID:indico-contribution-6175@cern.ch
DESCRIPTION:Speakers: Yuriy Uzikov (Joiny Institute for Nuclear Researches
 )\nThe resonance peak  observed by WASA@COSY  in the total cross section o
 f the reaction of two-pion production in the isoscalar channel of the reac
 tion pn → dπ0π0 [1] at invariant mass 2380 MeV with the width of 70 Me
 V\, is considered  as one of the most realistic candidate to the dibaryon 
 resonance.  The isospin of this resonance is  I=0  and spin-parity JP=3+. 
 A similar resonance structure was observed by ANKE@COSY in the differentia
 l cross section of the two-pion production reaction pd → pdππ at beam 
 energies 0.8-2.0 GeV with high transferred momentum to the deuteron at sma
 ll scattering angles of the final proton and deuteron [2]. The kinematic o
 f this reaction differ considerably from that in Ref. [1] and two final pi
 ons were not registered\, nevertheless in the distribution over the invari
 ant mass Mdππ of the final dππ system of the reaction pd → pdππ th
 e resonance peak was also observed at Mdππ ≈ 2.38 GeV [2].  In order  
 to explain these data\,  in Refs. [3] the two-resonance model  of the reac
 tion pn → dπ0π0  [4]  was applied  by  inclusion of the t-channel σ-m
 eson exchange between the proton and deuteron in the reaction pd → pdπ
 π.  Later\, the reaction γ d→ dπ0π0 was studied in Ref. [5] and  an 
 indication to excitation of isoscalar dibaryon resonance  D03(2380) and mo
 re heavier dibaryons d* with masses 2470 MeV and 2630 MeV  was found. Thes
 e resonances \, if they do exist\,  can be excited also in the reactions d
 d→ dd*  and dd→npd* at  SPD NICA collider.  We estimated [6]   the dif
 ferential  cross sections  of the reactions pd → pdππ   and dd → dd
 ππ assuming  excitaion  of the  D03(2380)  dibaryon by σ- meson exchang
 e in t-channel and calculated distributions  over  the invariant   mass  o
 f the final  dππ  system for these reactions . \n \n[1] P. Adlarson et a
 l. (WASA@COSY Collab.)\, Phys. Rev. Lett. 106\, 242302 (2011).    \n[2] V.
  I. Komarov et al. (ANKE@COSY Collab.)\, Eur. Phys. J. A (2018) 54: 206.  
        \n[3] Yu. Uzikov\, N. Tursunbayev\, EPJ Web of Conf. 204\, 08010 (2
 019).           \n[4] M.N. Platonova\, V.I. Kukulin\, Phys. Rev. C 87\, 02
 5202 (2013).            \n[5] T.C. Jude et al.\, Phys. Lett. B 832 (2022) 
 137277.                                                                   
  \n[6] Yu.N. Uzikov\, A.A.Temerbayev\, N.T. Tursunbayev\,  Phys. Part. Nuc
 l.\, 57\, № 5 (2026) 1026.\n\nhttps://indico.particle.mephi.ru/event/626
 /contributions/6175/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6175/
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