Pion Charge-Exchange Scattering at High Energies

Barnes, A. V.; Mellema, D.J.; Tollestrup, A.; Walker, Robert; Dahl, O. I.; Johnson, Rob; Kenney, Robert W.; Pripstein, M.

doi:10.1103/physrevlett.37.76

Cited by 126 publications

(50 citation statements)

References 18 publications

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“…From the masses of ω(782) and ω 3 (1670) one obtains a linear trajectory α ω (t) = 0.42 + 0.95 GeV −2 t, whose intercept at t = 0 agrees well with the value extracted from σ tot (pp) − σ tot (pp) in [33]. The masses of ρ(770) and ρ 3 (1690) give a linear trajectory α ρ (t) = 0.48 + 0.88 GeV −2 t, in good agreement with the intercept from σ tot (π − p) − σ tot (π + p) and with the trajectory extracted from the data on dσ/dt(π − p → π 0 n) up to about |t| ≈ 0.3 GeV 2 [34]. We emphasize that (10) is not a prediction of Regge theory, but rather corresponds to a simple form of Regge phenomenology: on one hand one expects subleading Regge trajectories to become important if x is not sufficiently small, and on the other hand the importance of Regge cuts, which lead to a more complicated behavior on x and t, is notoriously difficult to determine without further assumptions.…”

Section: Physical Motivationsupporting

confidence: 65%

Generalized parton distributions from nucleon form factor data

et al. 2005

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We present a simple empirical parameterization of the x-and t-dependence of generalized parton distributions at zero skewness, using forward parton distributions as input. A fit to experimental data for the Dirac, Pauli and axial form factors of the nucleon allows us to discuss quantitatively the interplay between longitudinal and transverse partonic degrees of freedom in the nucleon ("nucleon tomography"). In particular we obtain the transverse distribution of valence quarks at given momentum fraction x. We calculate various moments of the distributions, including the form factors that appear in the handbag approximation to wide-angle Compton scattering. This allows us to estimate the minimal momentum transfer required for reliable predictions in that approach to be around |t| ≃ 3 GeV 2 . We also evaluate the valence contributions to the energy-momentum form factors entering Ji's sum rule.

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Section: Physical Motivationsupporting

confidence: 65%

Generalized parton distributions from nucleon form factor data

et al. 2005

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“…The reactions π − p → π 0 n and π − p → ηn give classical examples of this situation. At small |t| and in a wide energy region, the differential cross sections of these reactions are described remarkably well by a simple Regge pole model with the linear ρ and a 2 trajectories [28,35].…”

Section: Contributions Of the Regge Cutsmentioning

confidence: 97%

Mechanisms of the reactionπ−p→a00(980)n
Achasov
¹
,
Shestakov
²

1997
Phys. Rev. D
125
20
334
0
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The main dynamical mechanisms of the reaction π − p → a 0 0 (980)n → π 0 ηn at high energies, currently investigated at Serpukhov and Brookhaven, are considered in detail. It is shown that the observed forward peak in its differential cross section can be explained within the framework of the Regge pole model only by the conspiring ρ 2 Regge pole exchange. The tentative estimates of the absolute π − p → a 0 0 (980)n → π 0 ηn reaction cross section at P π − lab = 18 GeV/c are obtained: σ ≈ 200 nb and, in the forward direction, dσ/dt ≈ 940 nb/GeV 2 . The contribution of the one pion exchange, which is forbidden by G-parity and which can rise owing to the f 0 0 (980)−a 0 0 (980) mixing, is also estimate. A role of the Regge cuts in the non-flip helicity amplitude is briefly examined and a conclusion is made that the contributions of the cuts have to be inessential in comparison with the conspiring ρ 2 Regge pole exchange.

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“…8: Example of the ρ (circles), ω (empty squares), φ (triangles) and π (dots) trajectories. Also shown is the continuation of the ρ trajectory as measured in π − p → ηn (Barnes, 1976).…”

Section: Regge Phenomenologymentioning

confidence: 99%

HERA collider physics

1999

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HERA, the first electron-proton collider, has been delivering luminosity since 1992. It is the natural extension of an impressive series of fixed-target leptonnucleon scattering experiments. The increase of a factor ten in center-of-mass energy over that available for fixed-target experiments has allowed the discovery of several important results, such as the large number of slow partons in the proton, and the sizeable diffractive cross section at large Q 2 . Recent data point to a possible deviation from Standard Model expectations at very high Q 2 , highlighting the physics potential of HERA for new effects. The HERA program is currently in a transition period. The first six years of data taking have primarily elucidated the structure of the proton, allowed detailed QCD studies and had a strong impact on the understanding of QCD dynamics. The coming years will bring the era of electroweak studies and high Q 2 measurements. This is therefore an appropriate juncture at which to review HERA results.

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Pion Charge-Exchange Scattering at High Energies

Cited by 126 publications

References 18 publications

Generalized parton distributions from nucleon form factor data

Generalized parton distributions from nucleon form factor data

Mechanisms of the reactionπ−p→a00(980)n
Achasov
¹
,
Shestakov
²

1997
Phys. Rev. D
125
20
334
0
View full text Add to dashboard Cite

HERA collider physics

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Pion Charge-Exchange Scattering at High Energies

Cited by 126 publications

References 18 publications

Generalized parton distributions from nucleon form factor data

Generalized parton distributions from nucleon form factor data

Mechanisms of the reactionπ−p→a00(980)nAchasov1, Shestakov2 1997Phys. Rev. D125203340View full textAdd to dashboardCite

HERA collider physics

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About

Mechanisms of the reactionπ−p→a00(980)n
Achasov
¹
,
Shestakov
²

1997
Phys. Rev. D
125
20
334
0
View full text Add to dashboard Cite