Erratum: Coulomb-nuclear interference in pion-nucleus bremsstrahlung [Phys. Rev. C<b>79</b>, 014607 (2009)]

Fäldt, Göran; Tengblad, Ulla

doi:10.1103/physrevc.87.029903

Cited by 8 publications

(16 citation statements)

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“…where d /d is the cross-section for the subprocess − → X − with squared total energy s, Q 2 is the momentum transfer to the nucleus, the fine structure constant, m the pion rest mass, Q min = (s − m 2 )/2p the minimum momentum transfer at beam momentum p. Form factor and higher-order QED effects are taken into account in F 2 eff (Q 2 ) [2]. For pion Compton scattering X − is again − and…”

Section: Epj Web Of Conferencesmentioning

confidence: 99%

Tests of Chiral perturbation theory with COMPASS

2014

EPJ Web of Conferences

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Abstract. The COMPASS experiment at CERN accesses pion-photon reactions via the Primakoff effect., where high-energetic pions react with the quasi-real photon field surrounding the target nuclei. When a single real photon is produced, pion Compton scattering is accessed and from the measured cross-section shape, the pion polarisability is determined. The COMPASS measurement is in contradiction to the earlier dedicated measurements, and rather in agreement with the theoretical expectation from ChPT. In the same experimental data taking, reactions with neutral and charged pions in the final state are measured and analyzed in the context of chiral perturbation theory. Pion-photon reactions as test of chiral perturbation theoryProperties of the pions ( − , 0 , + ) are of crucial interest in understanding quantum chromodynamics (QCD) and its low-momentum expansion, chiral perturbation theory (ChPT), where the pions are identified as the Goldstone bosons emerging from the spontaneous breaking of chiral symmetry.Pion-pion scattering has been studied in several approaches, and successfully described within ChPT. In contrast, for pion-photon interactions even the most fundamental process, i.e. Compton scattering still is a riddle. The leading structure-dependent term in this process is the polarisability, and its first experimental determinations resulted in values significantly higher than expected from most of the theoretical approaches, which motivated the present work. In addition, other pion-photon interactions with more pions in the final state came into reach, and are also studied. Primakoff technique and the pion polarisabilityInteractions of high-energetic hadrons with the nuclear Coulomb field represent a scattering off the quasi-real photon density, referred to as Primakoff reactions. The cross-section for a reaction − A → X − A on a nucleus A reads, in one-photon exchange approximation (see e.g.a

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Section: Epj Web Of Conferencesmentioning

confidence: 99%

Tests of Chiral perturbation theory with COMPASS

2014

EPJ Web of Conferences

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“…The function F C (q) describes Coulomb scattering of the electron, and for a nuclear-pointcharge distribution it can be integrated exactly, Ref. [3,9]. The F A (Q) is the Coulomb contribution (one-photon exchange) to eta-nucleus photoproduction.…”

Section: Factorizationmentioning

confidence: 99%

“…(61) is the squared Coulomb amplitude of the electron. Its analytic form is given in Refs [3,9]. It is not the usual Coulomb-scattering amplitude since it describes exchange of transverse photons, not Coulomb photons.…”

Section: Cross-section Distributionsmentioning

confidence: 99%

Meson production in high-energy electron-nucleus scattering

Fäldt

2012

Phys. Rev. C

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Pseudoscalar mesons can be produced and studied in high-energy electron-nucleus scattering. We review and extend our previous analysis of meson production in the nuclear Coulomb field. The P → γγ decay rates are most directly determined for mesons produced in the double-Coulomb region where both photons are nearly real, and provided the background-hadronic contribution remains small. The larger the mass of the meson the higher the electron energy needed to assure such a condition.

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“…The phase difference of the a 2 (1320) and the a 1 (1260) vanishes at larger t indicating that both resonances are produced diffractively. The t dependence of the relative phase is roughly described by a Glauber model analogous to [8]. Further analyses will focus on the study of the reaction πγ → 3π close to threshold in order to test recent χPT calculations [9].…”

Section: Hql 2010mentioning

confidence: 99%

Light-Meson Spectroscopy with COMPASS

Grube¹

2011

Proceedings of the XTH Nicola Cabibbo International Conference on Heavy Quarks and Leptons — PoS(HQL 2010)

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COMPASS is a multi-purpose fixed-target experiment at the CERN Super Proton Synchrotron investigating the structure and spectrum of hadrons. One primary goal is the search for new hadronic states, in particular spin-exotic mesons and glueballs. After a short pilot run in 2004 with a 190 GeV/c π − beam on a Pb target, which showed a significant spin-exotic J PC = 1 −+ resonance consistent with the controversial π 1 (1600), COMPASS collected large data samples with negative and positive hadron beams on H 2 , Ni, W, and Pb targets in 2008 and 2009. We present results from a partial-wave analysis of diffractive dissociation of 190 GeV/c π − into π − π + π − final states on Pb and H 2 targets with squared four-momentum transfer in the range 0.1 < t < 1 (GeV/c) 2 . This reaction provides clean access to the light-quark meson spectrum up to masses of 2.5 GeV/c 2 . A first comparison of the data from Pb and H 2 target shows a strong target dependence of the production strength of states with spin projections M = 0 and 1 relative to the a 2 (1320). The 2004 Pb data were also analyzed in the region of small squared fourmomentum transfer t < 10 −2 (GeV/c) 2 , where we observe interference of diffractive production and photoproduction in the Coulomb-field of the Pb nucleus.

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Erratum: Coulomb-nuclear interference in pion-nucleus bremsstrahlung [Phys. Rev. C79, 014607 (2009)]

Abstract: Erratum: Coulomb-nuclear interference in pion-nucleus bremsstrahlung [Phys. Rev. C 79, 014607 (2009)]

Cited by 8 publications

References 1 publication

Tests of Chiral perturbation theory with COMPASS

Tests of Chiral perturbation theory with COMPASS

Meson production in high-energy electron-nucleus scattering

Light-Meson Spectroscopy with COMPASS

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