Measurement of $\pi^{-}\gamma \to \pi^{-}\pi^{-}\pi^{+}$ at Low Masses, and Comparison to ChPT Prediction, at COMPASS

This paper presents an analysis of pi- Pb -> X- Pb -> pi-pi-pi+ Pb events at 190 GeV/c beam momentum and very low four-momentum transfer t'<0.001 GeV^2/c^2. Coherent scattering off the nucleus as a whole dominates with contributions from Reggeon, Pomeron and photon exchange. The latter...

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Detalles Bibliográficos
Autores principales: Grabmuller, Stefanie, Ryabchikov, Dmitry, Friedrich, Jan M.
Lenguaje:eng
Publicado: 2011
Materias:
Particle Physics - Experiment
Acceso en línea:http://cds.cern.ch/record/1378795
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author Grabmuller, Stefanie
Ryabchikov, Dmitry
Friedrich, Jan M.
author_facet Grabmuller, Stefanie
Ryabchikov, Dmitry
Friedrich, Jan M.
author_sort Grabmuller, Stefanie
collection CERN
description This paper presents an analysis of pi- Pb -> X- Pb -> pi-pi-pi+ Pb events at 190 GeV/c beam momentum and very low four-momentum transfer t'<0.001 GeV^2/c^2. Coherent scattering off the nucleus as a whole dominates with contributions from Reggeon, Pomeron and photon exchange. The latter originates from Primakoff reactions and is identified by the sharp Coulomb peak of intensities at t' approx 0. The partial-wave analysis of these data focusses on new techniques for the extraction of the Primakoff contribution at low masses. Its measured absolute cross-section at sqrt(s) < 5 m_pi is well in agreement with the prediction from chiral perturbation theory.
id cern-1378795
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2011
record_format invenio
spelling cern-13787952023-03-14T20:51:16Zhttp://cds.cern.ch/record/1378795engGrabmuller, StefanieRyabchikov, DmitryFriedrich, Jan M.Measurement of $\pi^{-}\gamma \to \pi^{-}\pi^{-}\pi^{+}$ at Low Masses, and Comparison to ChPT Prediction, at COMPASSParticle Physics - ExperimentThis paper presents an analysis of pi- Pb -> X- Pb -> pi-pi-pi+ Pb events at 190 GeV/c beam momentum and very low four-momentum transfer t'<0.001 GeV^2/c^2. Coherent scattering off the nucleus as a whole dominates with contributions from Reggeon, Pomeron and photon exchange. The latter originates from Primakoff reactions and is identified by the sharp Coulomb peak of intensities at t' approx 0. The partial-wave analysis of these data focusses on new techniques for the extraction of the Primakoff contribution at low masses. Its measured absolute cross-section at sqrt(s) < 5 m_pi is well in agreement with the prediction from chiral perturbation theory.This paper presents an analysis of pi- Pb -> X- Pb -> pi-pi-pi+ Pb events at 190 GeV/c beam momentum and very low four-momentum transfer t'<0.001 GeV^2/c^2. Coherent scattering off the nucleus as a whole dominates with contributions from Reggeon, Pomeron and photon exchange. The latter originates from Primakoff reactions and is identified by the sharp Coulomb peak of intensities at t' approx 0. The partial-wave analysis of these data focusses on new techniques for the extraction of the Primakoff contribution at low masses. Its measured absolute cross-section at sqrt(s) < 5 m_pi is well in agreement with the prediction from chiral perturbation theory.arXiv:1108.6039oai:cds.cern.ch:13787952011-08-31
spellingShingle Particle Physics - Experiment
Grabmuller, Stefanie
Ryabchikov, Dmitry
Friedrich, Jan M.
Measurement of $\pi^{-}\gamma \to \pi^{-}\pi^{-}\pi^{+}$ at Low Masses, and Comparison to ChPT Prediction, at COMPASS
title Measurement of $\pi^{-}\gamma \to \pi^{-}\pi^{-}\pi^{+}$ at Low Masses, and Comparison to ChPT Prediction, at COMPASS
title_full Measurement of $\pi^{-}\gamma \to \pi^{-}\pi^{-}\pi^{+}$ at Low Masses, and Comparison to ChPT Prediction, at COMPASS
title_fullStr Measurement of $\pi^{-}\gamma \to \pi^{-}\pi^{-}\pi^{+}$ at Low Masses, and Comparison to ChPT Prediction, at COMPASS
title_full_unstemmed Measurement of $\pi^{-}\gamma \to \pi^{-}\pi^{-}\pi^{+}$ at Low Masses, and Comparison to ChPT Prediction, at COMPASS
title_short Measurement of $\pi^{-}\gamma \to \pi^{-}\pi^{-}\pi^{+}$ at Low Masses, and Comparison to ChPT Prediction, at COMPASS
title_sort measurement of $\pi^{-}\gamma \to \pi^{-}\pi^{-}\pi^{+}$ at low masses, and comparison to chpt prediction, at compass
topic Particle Physics - Experiment
url http://cds.cern.ch/record/1378795
work_keys_str_mv AT grabmullerstefanie measurementofpigammatopipipiatlowmassesandcomparisontochptpredictionatcompass
AT ryabchikovdmitry measurementofpigammatopipipiatlowmassesandcomparisontochptpredictionatcompass
AT friedrichjanm measurementofpigammatopipipiatlowmassesandcomparisontochptpredictionatcompass

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