Differential Cross Sections for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">pp</mml:mi><mml:mo>→</mml:mo><mml:mi mathvariant="italic">pn</mml:mi><mml:mi mathvariant="italic">π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>near Threshold

Daehnick, W. W.; Dytman, S. A.; Hardie, J.; Brooks, W. K.; Flammang, Robert; Bland, L. C.; Jacobs, W. W.; Rinckel, T.; Pancella, P. V.; Brown, J.D.; Jacobson, Erica M.

doi:10.1103/physrevlett.74.2913

Cited by 28 publications

(23 citation statements)

References 16 publications

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“…The deviations between our predictions and the IUCF data [7][8][9] may be partially experimental in origin. It should be noted that there are uncertainties of the order of 10% in some of the pp → dπ + observables used as input, and this is worse for the differential quantities in pp → ppπ 0 .…”

Section: Discussionmentioning

confidence: 49%

“…The accurate measurements of the pp → ppπ 0 total cross section at the Indiana [4] and CELSIUS storage rings [5] down to Q ≈ 1 MeV provoked great theoretical interest because the comparatively large cross section revealed the influence of unexpected short-range physics [6]. The total and differential cross sections for charged pion production in the allied pp → pnπ + reaction have also been measured very close to threshold [7,8] and these results have recently been complemented by the determination of the proton analyzing power [9]. At the same value of Q, charged pion production is typically a factor of five larger than neutral and the interesting practical question to ask is to what extent the extra information will constrain theory further.…”

Section: Introductionmentioning

confidence: 99%

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Cross section and analyzing power ofp→p→pnπ+near threshold

Fäldt¹,

Wilkin²

1997

Phys. Rev. C

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The cross section and analyzing power of the p ជ p→ pn ϩ reaction near threshold are estimated in terms of data obtained from the p ជ p→d ϩ and pp→pp 0 reactions. A simple final state interaction theory is developed which depends weakly upon the form of the pion-production operator and includes some Coulomb corrections. Within the uncertainties of the model and the input data, the approach reproduces well the measured energy dependence of the total cross section and the proton analyzing power at a fixed pion centerof-mass angle of 90°, from threshold to T p ϭ330 MeV. The variation of the differential cross section with pion angle is also very encouraging. ͓S0556-2813͑97͒03410-9͔

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Section: Discussionmentioning

confidence: 49%

Section: Introductionmentioning

confidence: 99%

Cross section and analyzing power ofp→p→pnπ+near threshold

Fäldt¹,

Wilkin²

1997

Phys. Rev. C

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“…In recent studies it was found that within 10-20 MeV of threshold, i.e. below 300 MeV, only Ss for pp → ppπ 0 , [1][2][3] or at most two partial waves (Ss and Sp) for pp → dπ + and pp → pnπ + [4][5][6][7][8][9][10] were important, and direct comparisons with simple theoretical approaches can be made. The expected dominance of Ss contributions (l N N = 0, L π = 0) for the final states was seen, but at the same time it was found that for pp → ppπ 0 traditional models under-predicted the cross sections by factors of 3-5. At higher energies the reaction pp → pnπ + tends to be dominated by the delta resonance.…”

Section: Introductionmentioning

confidence: 99%

Spin correlation coefficients in p⃗p⃗→pnπ[sup +] from 325 to 400 MeV

Saha¹,

Daehnick²,

Flammang³

et al. 2000

AIP Conference Proceedings

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The spin correlation coefficient combinations S ≡ Axx + Ayy, D ≡ Axx − Ayy and the analyzing powers Ay(θ) were measured for p p → pnπ + at beam energies of 325, 350, 375 and 400 MeV. A polarized internal atomic hydrogen target and a stored, polarized proton beam were used. These polarization observables are sensitive to contributions of higher partial waves. A comparison with recent theoretical calculations is provided.

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“…High precision data on the total as well as differential cross sections for the p(p, pπ 0 )p and p(p, nπ + )p reactions at the incident proton energies very close to the kinematical threshold have now become available [1,2,3]. At low energies, these reactions necessarily involve large momentum transfers, which make them very sensitive to the nucleon-nucleons (NN) interactions at small distances.…”

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confidence: 99%

NN→NNπ reaction near threshold in a covariant one-boson-exchange model

Shyam¹,

Mosel²

1998

Physics Letters B

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We calculate the cross sections for the p(p, nπ + )p and p(p, pπ 0 )p reactions for proton beam energies near threshold in a covariant one-bosonexchange model, which incorporates the exchange of π, ρ, σ and ω mesons and treats both nucleon and delta isobar as intermediate states. The final state interaction effects have also been included. The ω meson exchange is found to contribute significantly at these energies, which, along with other meson exchanges, provides an excellent agreement with the data. The cross sections at beam energies ≤ 300 MeV are almost free from the contributions of the ∆ isobar excitation.KEYWORD: π 0 and π + production near threshold, covariant oneboson-exchange model, contribution of heavy meson exchange.

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Differential Cross Sections forpp→pnπ+near Threshold

Cited by 28 publications

References 16 publications

Cross section and analyzing power ofp→p→pnπ+near threshold

Cross section and analyzing power ofp→p→pnπ+near threshold

Spin correlation coefficients in p⃗p⃗→pnπ[sup +] from 325 to 400 MeV

NN→NNπ reaction near threshold in a covariant one-boson-exchange model

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