Exclusive measurement of the pp → nnπ+π+ reaction at 1.1 GeV

Skorodko, T.; Bashkanov, M.; Bogoslawsky, D.; Calén, H.; Clement, H.; Doroshkevich, E.; Demiroers, L.; Ekström, C.; Fransson, K.; Gustafsson, L.; Höistad, B.; Ivanov, G.; Jacewicz, M.; Jiganov, E.; Johansson, T.; Khakimova, O.; Keleta, S.; Koch, I.; Kren, F.; Kullander, S.; Kupść, A.; Marciniewski, P.; Meier, R.; Morosov, B.; Pauly, C.; Petrén, H.; Petukhov, Y.; Povtorejko, A.; Ruber, Roger; Schönning, K.; Scobel, W.; Shwartz, B.; Steṕaniak, J.; Thörngren-Engblom, P.; Tikhomirov, V.; Wagner, G. J.; Wolke, M.; Yamamoto, A.; Zabierowski, J.; Złomańczuk, J.

doi:10.1140/epja/i2011-11108-2

Cited by 25 publications

(20 citation statements)

References 24 publications

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“…As a result of these kinematically complete and exclusive two-pion production measurements at CELSIUS and subsequently at COSY it was shown that all pp induced, i.e. all isovector channels, behave as expected from conventional t-channel excitation of Roper, ∆∆ (mutual excitation of the colliding nucleons into their first excited state ∆(1232)) and ∆(1600) resonances [8,9,10,11,12,13,14,15,16,17].…”

Section: Exclusive and Kinematically Complete Experiments -Observatiomentioning

confidence: 88%

From CELSIUS to COSY: on the observation of a dibaryon resonance

2015

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Using the high-quality beam of storage rings in combination with a pellet target and the hermetic WASA detector covering practically the full solid angle the two-pion production in nucleon-nucleon collisions has been systematically studied by exclusive and kinematically complete measurements -first at CELSIUS and subsequently at COSY. These measurements resulted in a detailed understanding of the two-pion production mechanism by t-channel meson exchange. The investigation of the ABC effect in double-pionic fusion reactions lead the trace to the observation of a narrow dibaryon resonance with I(J P ) = 0(3 + ) about 80 MeV below the nominal mass of the conventional ∆∆ system. New neutron-proton scattering data, taken with polarized beam at COSY, produce a pole in the coupled 3 D 3 -3 G 3 partial waves at (2380±10 − i 40±5) MeV establishing thus the first observation of a genuine s-channel dibaryon resonance.

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Section: Exclusive and Kinematically Complete Experiments -Observatiomentioning

confidence: 88%

From CELSIUS to COSY: on the observation of a dibaryon resonance

2015

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“…The analysis of the pp → nnπ + π + reaction gives about 15 µb [15] for this cross section at T p = 1.25 GeV, which results in…”

Section: Two-pion Productionmentioning

confidence: 95%

“…In recent years the two-pion production in pp and pn collisions has been measured by exclusive and kinematically complete experiments over the energy region from threshold up to T lab = 1.4 GeV [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Two-pion Productionmentioning

confidence: 99%

On a possible explanation of the DLS puzzle

Bashkanov

Clement

2014

Eur. Phys. J. A

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The enhancement in the dilepton spectrum observed in heavy-ion collisions for invariant electronpositron masses in the range 0.15 GeV/c 2 < M e + e − < 0.6 GeV/c 2 has recently been traced back to a corresponding enhancement in pn collisions relative to pp collisions. Whereas the dilepton spectra in the latter are understood quantitatively, theoretical descriptions fail to describe the much higher dilepton rate in pn collisions, in particular regarding the region M e + e − > 0.3 GeV/c 2 at beam energies below 2 GeV. We show that the missing strength can be attributed to the ρ-channel π + π − -production, which is dominated by the t-channel ∆∆ excitation and the recently found isoscalar dibaryonic resonance structure at 2.37 GeV.

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“…Starting first with the WASA/PROMICE detector setup, followed by the completed WASA detector at CELSIUS and finally at COSY all ppinduced, i.e. isovector two-pion production channels from threshold up to √ s = 2.5 GeV have been studied [323,324,325,326,327,328,329,330,331] complemented by a corresponding program with polarized beam at COSY-TOF [314,332]. The results for the total cross sections are shown in Fig.…”

Section: No Dibaryon Signal In Pp-induced Two-pion Productionmentioning

confidence: 99%

“…As a result it was found [350] that there is, indeed, a highly visible low-mass enhancement but no high-mass enhancement as seen in previous σ 0 π + π pn → pp Figure 9: Energy dependence of the pp-induced total cross sections for two-pion production and their isospin decomposition. Open symbols denote results from bubble-chamber measurements [317,318,319,320,321,322], solid symbols represent measurements from WASA/PROMICE (triangles) [323,324,325], CELSIUS/WASA (circles) [326,327,328,329,330] and COSY-TOF (squares) [314]. At the top the reaction channels pp → ppπ 0 π 0 (left) and pp → nnπ + π + (right) are shown together with their isospin decomposition.…”

Section: Following a Trace: The Abc Effectmentioning

confidence: 99%