Predictions of striking energy and angular dependence in <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:msub><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mi>p</mml:mi><mml:mi>p</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:mrow><mml:mrow><mml:mi>S</mml:mi><mml:mtext>-</mml:mtext><mml:mi mathvariant="normal">wave</mml:mi></mml:mrow></mml:msub><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msu

Niskanen, J.A.

doi:10.1016/j.physletb.2006.06.083

Cited by 11 publications

(2 citation statements)

References 19 publications

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“…Such an M1 transition is forbidden in the diproton case [1] but the strength could come from a P-wave N configuration, which requires extra energy in order to overcome the centrifugal barrier. Similar arguments have been used to explain why the peak is shifted to higher energy also for the pp → {pp} s π 0 reaction [28]. In addition to the displacement of the pp → {pp} s γ peak position to higher energies, it is narrowed significantly compared to pn → dγ .…”

Section: T P (Mevmentioning

confidence: 52%

Energy dependence of hard bremsstrahlung production in proton–proton collisions in the Δ(1232) region

Tsirkov¹,

Komarov²,

Azaryan³

et al. 2010

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

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Abstract. Hard bremsstrahlung production in proton-proton collisions has been studied with the ANKE spectrometer at COSY-Jülich in the energy range of 353-800 MeV by detecting the final proton pair {pp} s from the pp → {pp} s γ reaction with very low excitation energy. Differential cross sections were measured at small diproton c.m. angles from 0• to 20 • and the average over this angular interval reveals a broad peak at a beam energy around 650 MeV with a FWHM ≈ 220 MeV, suggesting the influence of ∆(1232)N intermediate states. Comparison with deuteron photodisintegration shows that the cross section for diproton production is up to two orders of magnitude smaller, due largely to differences in the selection rules.PACS numbers: 25.40. Ep, 25.20.Dc

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Section: T P (Mevmentioning

confidence: 52%

Energy dependence of hard bremsstrahlung production in proton–proton collisions in the Δ(1232) region

Tsirkov¹,

Komarov²,

Azaryan³

et al. 2010

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

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“…Analysis of reaction (2) in the frame of the three-amplitude approach was performed earlier in Ref. [45]. That calculation also used the amplitudes with the angular momenta of the initial proton pair L 3 and of the pion wave l < 4, but the relative values of the amplitudes found there in the coupledchannels approach [46] substantially differ from ours.…”

Section: Phenomenological Analysis and Discussionmentioning

confidence: 89%

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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