Energy dependence of forward 1S0 diproton production in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>p</mml:mi><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:mi>p</mml:mi><mml:mi>p</mml:mi><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math> reaction

Kurbatov, V.; Büscher, M.; Dymov, S.; Gusev, D.V.; Hartmann, Michael; Kacharava, A.; Khoukaz, A.; Komarov, V.I.; Куликов, А. И.; Macharashvili, G.; Mersmann, T.; Merzliakov, S.; Mikirtytchiants, S.; Prasuhn, D.; Rathmann, F.; Schleichert, R.; Ströher, H.; Tsirkov, D.; Uzikov, Yu. N.; Wilkin, C.; Yaschenko, S.

doi:10.1016/j.physletb.2008.01.051

Cited by 22 publications

(15 citation statements)

References 22 publications

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“…A more detailed description of the setup, measurements, and data processing can be found in Refs. [29][30][31][32][33][34]. The only essential change in the data processing was more careful tuning of the geometry of the setup and introduction of a kinematical fit into this procedure.…”

Section: Measurementsmentioning

confidence: 99%

“…In spite of these advantages of reaction (2), its experimental study was incomparably less extensive than of (1) due to a smaller cross section and necessity of high momentum resolution for the 1 S 0 diproton identification. The proton-beam energy of T p = 425 MeV in the WASA (Wide-Angle Shower Apparatus) experiment [28] was the highest for reaction (2) until the ANKE measurements from 353 to 1970 MeV were published [29][30][31]. The whole (1232) excitation region has been scarcely explored yet.…”

Section: Introductionmentioning

confidence: 99%

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Evidence for excitation of two resonance states in the isovector two-baryon system with a mass of 2.2 GeV/c2

et al. 2016

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We report on measurements of the differential cross section dσ/d and the first measurement of the analyzing power A y in the (1232) excitation energy region of the reaction pp → {pp} s π 0 where {pp} s is a 1 S 0 proton pair. The experiment has been performed with the ANKE spectrometer at COSY-Jülich. The data reveal a peak in the energy dependence of the forward {pp} s differential cross section, a minimum at zero degrees of its angular distribution, and a large analyzing power. The results present a direct manifestation of two two-baryon resonance-like states with J P = 2 − and 0 − and an invariant mass of 2.2 GeV/c 2 .

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Section: Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evidence for excitation of two resonance states in the isovector two-baryon system with a mass of 2.2 GeV/c2

et al. 2016

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“…The diproton programme at ANKE involves several experiments: study of mesonless deuteron break-up pd → {pp} s n [2][3][4][5], study of one and two pion production in pN collisions [6,7], and of inverse diproton photodisintegration pp → {pp} s γ [8]. Investigation of single pion production and the charge-exchange reaction are the key double polarization experiments in the future physics programme at ANKE.…”

Section: Reactions With Diproton Final State At Ankementioning

confidence: 99%

Studies of Di-proton production at ANKE

Dymov¹,

Khemchandani²,

Nagahiro³

et al. 2011

AIP Conference Proceedings

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“…-Study of meson production in pN → {pp} s X, where X is: -a single pion [6], a e-mail: s.dymov@fz-juelich.de -the (ππ) system, used to study of the ABC effect in pp collisions [7], -a heavier meson like η and ω.…”

Section: Experiments With Diproton Final States At Ankementioning

confidence: 99%

“…Because of the large momentum transfers involved, even close to threshold, such a meson production is sensitive to the shortrange part of the NN-interaction. The pp → (pp) s π 0 differential cross section has been measured with the ANKE spectrometer at COSY-Jülich for seven proton beam energies T p between 0.5 and 2.0 GeV [6]. In the measured region of θ cm pp = ±18…”

Section: Deuteron Charge-exchange Break-up Reactionmentioning

confidence: 99%

Physics with diproton ﬁnal states at ANKE-COSY

Dymov

2010

EPJ Web of Conferences

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Abstract. The study of processes with production of proton pairs with small excitation energy (diprotons) provides a new approach to hadron interactions at intermediate energies. It is especially instructive due to comparison with processes where a deuteron is produced in the same kinematics. Provided that the momentum transfer is high enough the diprotons are found presumably in the 1 S 0 state, and this simplifies the theoretical analysis. The ANKE spectrometer provides the possibility to select the diprotons with sufficiently high excitation energy resolution. A number of processes including pd → {pp} s n, production of one and two pions in pN collisions, and the pp → {pp} s γ process, have been investigated. Experiments with diproton final states at ANKEFew nucleon systems have long been a subject of intensive theoretical and experimental study. A particularly important role in this study is played by processes with production of the deuteron, a bound state of proton and neutron. In this respect, a particular interest arises for the investigation of the diproton, an unbound system of two protons with small excitation energy. The diproton, being the isospin partner of the deuteron, possesses different quantum numbers. Selection of the excitation energy of the proton pair E pp < 3 MeV ensures the dominance of the 1 S 0 state of the diproton, which simplifies significantly the theoretical interpretation. The reactions with formation of a diproton involve transitions in the NN system, different from the case of the deuteron, and, in particular, the role of the ∆ isobar is expected to be much suppressed because the S-wave ∆N intermediate state is forbidden.Detection of the proton pair with E pp < 3 MeV in an experiment requires an excellent excitation energy resolution and the ability to resolve the two spatially close trajectories of the protons. The ANKE spectometer [1] provides a resolution of σ(E pp ) = 0.2 − 0.6 MeV in the E pp = 0 − 3 MeV range and is particularly well suited for this purpose.The diproton program at ANKE involves several experiments: It should be mentioned that investigation of single pion production and the charge-exchange reaction are the key double polarization experiments in the future physics program at ANKE. Deuteron break-up reactions High momentum transferThe process to be studied is pd → {pp} s n with a forward emitted diproton. The kinematics of the process is the same as in pd-backward scattering and the same mechanisms can be considered for its description. In contrast to pd → d p, the amplitude of excitation of ∆ in the intermediate state is expected to be suppressed by a factor of 3 due to selection of the diproton in an S -wave. Thus, the one nucleon exchange mechanism, which is sensitive to the short range part of the NN-interaction potential and to the high momentum part of the deuteron wave function, is expected to play a more important role.The differential cross-section of pd → {pp} s n with a forward emitted diproton has been measured in the range of T p = 0.5 − 2.0 GeV...

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Energy dependence of forward 1S0 diproton production in the pp→ppπ0 reaction

Cited by 22 publications

References 22 publications

Evidence for excitation of two resonance states in the isovector two-baryon system with a mass of 2.2 GeV/c2

Evidence for excitation of two resonance states in the isovector two-baryon system with a mass of 2.2 GeV/c2

Studies of Di-proton production at ANKE

Physics with diproton ﬁnal states at ANKE-COSY

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