QED radiative corrections in processes of exclusive pion electroproduction

Afanasev, A.; Akushevich, Igor; Burkert, Volker; Joo, K. S.

doi:10.1103/physrevd.66.074004

Cited by 70 publications

(71 citation statements)

References 30 publications

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“…In this analysis we have corrected the cross sections for internal radiative effects using the approach developed by A. Afanasev et al [42] for exclusive electroproduction of pseudoscalar mesons. This approach uses a model cross section as input, and performs an exact calculation without relying on the usual peaking approximation or the separate treatment of soft and hard photon radiation.…”

Section: B Radiative Correctionsmentioning

confidence: 99%

Measurements ofep→e′π+nat1.6<W<2.0 GeV and extraction of nucleon

Park¹,

Aznauryan²,

Burkert³

et al. 2015

Phys. Rev. C

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Differential cross sections of the exclusive process ep → e π + n were measured with good precision in the range of the photon virtuality Q 2 = 1.8 − 4.5 GeV 2 , and the invariant mass range of the π + n final state W = 1.6 − 2.0 GeV using the CEBAF Large Acceptance Spectrometer. Data were collected with nearly complete coverage in the azimuthal and polar angles of the nπ + center-of-mass system. More than 37,000 cross section points were measured. The contributions of the isospin I = + resonance our analysis shows significant strength for the A 1/2 amplitude at Q 2 < 2.5 GeV 2 .

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Section: B Radiative Correctionsmentioning

confidence: 99%

Measurements ofep→e′π+nat1.6<W<2.0 GeV and extraction of nucleon

Park¹,

Aznauryan²,

Burkert³

et al. 2015

Phys. Rev. C

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“…The first was the exclusive approach based on the EXCLURAD program [51] and the second was based on the inclusive approach based on the GENEV program [46]. Comparison of the extracted radiative corrections between EXCLURAD and GENEV were within about 8% of each other.…”

Section: Radiative Correctionsmentioning

confidence: 99%

“…The first uses the stand-alone program EXCLURAD [51] and the second uses the event generator GENEV [46] in combination with the CLAS Monte Carlo. The radiative correction factor that multiplies the measured bin-averaged differential cross section in each bin is defined as the ratio of the computed bin-averaged cross section with radiation off to that with radiation on.…”

Section: E Radiative Correctionsmentioning

confidence: 99%

Separated structure functions for exclusiveK+ΛandK+Σ0electroproduction at 5.5 GeV measured with CLAS

Carman¹,

Park²,

Raue³

et al. 2013

Phys. Rev. C

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We report measurements of the exclusive electroproduction of K + Λ and K + Σ 0 final states from an unpolarized proton target using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The separated structure functions σ U , σ LT , σ T T , and σ LT ′ were extracted from the Φ-dependent differential cross sections acquired with a longitudinally polarized 5.499 GeV electron beam. The data span a broad range of momentum transfers Q 2 from 1.4 to 3.9 GeV 2 , invariant energy W from threshold to 2.6 GeV, and nearly the full center-of-mass angular range of the kaon. The separated structure functions provide an unprecedented data sample, which in conjunction with other meson photo-and electroproduction data, will help to constrain the higher-level analyses being performed to search for missing baryon resonances.

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“…The internal radiative correction, additional photon leg in Feynman diagram, was calculated using EXCLURAD [41,42] and applied to the measured differential cross section bin by bin before perform the fitting. EXCLURAD is a code written in fortran for calculating the radiative corrections to exclusive electroproduction of pions on a nucleon.…”

Section: Radiative Correctionsmentioning

confidence: 99%

Precision Measurement of Electroproduction of pi<sup>0</sup> near Threshold

Chirapatpimol

2012

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0near Threshold ABSTRACT Electromagnetic production of neutral pions near threshold is the most basic, lowest energy reaction in which a new hadron is created. The electromagnetic interaction is well understood so measurements of this reaction can yield direct insight into the hadronic production mechanism.During the past three decades there have been many developments in both the measurement and theory of threshold pion production, starting with measurements of photoproduction, p(γ, π 0 )p, at Saclay in 1986 and at Mainz in 1990. These measurements indicated a surprising discrepancy with so-called Low Energy Theorems (LETs) which are based on quite fundamental symmetries and considerations. Chiral Perturbation Theory (ChPT) is an effective field theoretic description of the nuclear force which contains the underlying symmetries of the force but deals with nucleons and pions rather than quarks and gluons. It has the advantage of being applicable at low energies but requires tuning some parameters to experimental data. Once these parameters have been determined ChPT predicts how the reaction should behave as a function of the kinematic vaiables. When applied to the reaction, p(γ, π 0 )p, near threshold it explained the discrepancy with the LETs and made predictions for electroproduction, p(e, e p)π 0 . Electroproduction measurements at Mainz in the 1990's showed a clear discrepancy with these predictions of ChPT; with parameters determined from one set of kinematics the data for a second set lay far from the predicted value. However, recently completed measurements at Mainz disagreed with their previous measurements.In the experiment presented here, measurements of neutral pion electroproduction, I would also like to thank the other people who were involved in the experiment. But, let me start by apologizing if I forget to mention anyone:

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QED radiative corrections in processes of exclusive pion electroproduction

Abstract: Formalism for radiative correction (RC) calculation in exclusive pion electroproduction on the proton is presented. A FORTRAN code EXCLURAD is developed for the RC procedure. The numerical analysis is done in the kinematics of current Jefferson Lab experiments.

Cited by 70 publications

References 30 publications

Measurements ofep→e′π+nat1.6<W<2.0 GeV and extraction of nucleon

Measurements ofep→e′π+nat1.6<W<2.0 GeV and extraction of nucleon

Separated structure functions for exclusiveK+ΛandK+Σ0electroproduction at 5.5 GeV measured with CLAS

Precision Measurement of Electroproduction of pi<sup>0</sup> near Threshold

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