Mechanisms of the reaction<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mi>−</mml:mi></mml:mrow></mml:msup></mml:mrow><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:mrow><mml:msubsup><mml:mrow><mml:mi>a</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msubsup></mml:mrow><mml:mn /><mml:mo>(</mml:mo><mml:mn>980</mml:mn><mml:mo>)</mml:mo><mml:mi>n</mml:mi><mml:m

Achasov, N. N.; Shestakov, G. N.

doi:10.1103/physrevd.56.212

Cited by 125 publications

(354 citation statements)

References 38 publications

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“…[21]. They correspond to two fits of the Brookhaven data on dσ/dt at 18 GeV/c [39] found by Achasov and Shestakov [15]: a) with pure ρ 2 contribution and b) with combined ρ 2 + b 1 contribution.…”

Section: The Reggeon Exchange Modelsupporting

confidence: 59%

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Production of a0 mesons in pp and pn reactions

Bratkovskaya

Grishina

Kondratyuk

et al. 2002

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

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Abstract. We investigate the cross section for the reaction N N → N N a 0 near threshold and at medium energies. An effective Lagrangian approach with one-pion exchange is applied to analyze different contributions to the cross section for different isospin channels. The Reggeon exchange mechanism is also considered. The results are used to calculate the contribution of the a 0 meson to the cross sections and invariant KK mass distributions of the reactions pp → pnK +K 0 and pp → ppK + K − . It is found that the experimental observation of a + 0 mesons in the reaction pp → pnK +K 0 is much more promising than the observation of a 0 0 mesons in the reaction pp → ppK + K − . PACS

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Section: The Reggeon Exchange Modelsupporting

confidence: 59%

“…In the model of Ref. [15] the s-channel helicity amplitudes are expressed through the b 1 and the conspiring ρ 2 Regge trajectories exchange as follows…”

Section: The Reggeon Exchange Modelmentioning

confidence: 99%

Production of a0 mesons in pp and pn reactions

Bratkovskaya

Grishina

Kondratyuk

et al. 2002

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

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“…(73) for the vertex function -since we are only after the scaling behaviour of the remaining violation of gauge invariance, here we are free to work within a particular model. This choice ensures convergence of the loop integral and complies with the large-β expansion (36). Then we get…”

Section: B Normalization Of the Vertex Functionmentioning

confidence: 99%

“…The two-photon decay of an unstable scalar meson in the limit of point-like interactions was evaluated, for example, in Ref. [36]. More systematic studies of the problem of unstable particles will be subject of a future work.…”

Section: Leading Range Correctionsmentioning

confidence: 99%

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Two-photon decays of hadronic molecules

Hanhart

Kalashnikova²,

Kudryavtsev³

et al. 2007

Phys. Rev. D

119

139

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In many calculations of the two-photon decay of hadronic molecules, the decay matrix element is estimated using the wave function at the origin prescription, in analogy to the two-photon decay of parapositronium. We question the applicability of this procedure to the two-photon decay of hadronic molecules for it introduces an uncontrolled model dependence into the calculation. As an alternative approach, we propose an explicit evaluation of the hadron loop. For shallow bound states, this can be done as an expansion in powers of the range of the molecule binding force 1/β. In the leading order one gets the well-known pointlike limit answer. We estimate, in a self-consistent and gauge invariant way, the leading range corrections for the two-photon decay width of weakly bound hadronic molecules emerging from kaon loops. We find them to be small, of order O(mε/β 2 ), where m and ε denote the mass of the constituents and the binding energy, respectively. The role of possible shortranged operators and of the width of the scalars remains to be investigated.

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On the possibility of f 0 observation in low energy pp collisions

Bratkovskaya

Cassing

Kondratyuk

et al. 1999

EPJ A

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Abstract. Within the meson-exchange model we calculate f0-meson production cross section in πN and N N reactions and investigate the possibility for f0 observation via the KK decay mode in pp collisions. Our studies indicate that an extraction of the f0 signal is unlikely due to the large background from other reaction channels.PACS. 13.75.Cs Nucleon-nucleon interactions -13.75.Gx Pion-baryon interactions

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Mechanisms of the reactionπ−p→a00(980)n

Cited by 125 publications

References 38 publications

Production of a0 mesons in pp and pn reactions

Production of a0 mesons in pp and pn reactions

Two-photon decays of hadronic molecules

On the possibility of f 0 observation in low energy pp collisions

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