Partonic structure of pi and rho mesons from data on hard (semi)exclusive production of two pions off nucleon

We fitted the pi-pi mass distribution in the range 0.5 < mpipi < 1.1 GeV measured in hard exclusive positron-proton reactions at HERA by the form dictated by QCD at leading twist level. Extracted parameters are related to valence quark distribution in the pion, and to the pion and rho meson di...

Descripción completa

Detalles Bibliográficos
Autores principales: Clerbaux, B., Polyakov, Maxim V.
Lenguaje:eng
Publicado: 2000
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1016/S0375-9474(00)00337-7
http://cds.cern.ch/record/425006
_version_ 1780895033704054784
author Clerbaux, B.
Polyakov, Maxim V.
author_facet Clerbaux, B.
Polyakov, Maxim V.
author_sort Clerbaux, B.
collection CERN
description We fitted the pi-pi mass distribution in the range 0.5 < mpipi < 1.1 GeV measured in hard exclusive positron-proton reactions at HERA by the form dictated by QCD at leading twist level. Extracted parameters are related to valence quark distribution in the pion, and to the pion and rho meson distribution amplitudes. We obtain, for the first time, a measurement of the second Gegenbauer coefficient of the rho meson distribution amplitude: $a_2^{(\rho)}= -0.10\pm 0.20 $ for a photon virtuality of $<Q^2 >=21.2$ GeV$^2$.
id cern-425006
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2000
record_format invenio
spelling cern-4250062019-09-30T06:29:59Zdoi:10.1016/S0375-9474(00)00337-7http://cds.cern.ch/record/425006engClerbaux, B.Polyakov, Maxim V.Partonic structure of pi and rho mesons from data on hard (semi)exclusive production of two pions off nucleonParticle Physics - PhenomenologyWe fitted the pi-pi mass distribution in the range 0.5 < mpipi < 1.1 GeV measured in hard exclusive positron-proton reactions at HERA by the form dictated by QCD at leading twist level. Extracted parameters are related to valence quark distribution in the pion, and to the pion and rho meson distribution amplitudes. We obtain, for the first time, a measurement of the second Gegenbauer coefficient of the rho meson distribution amplitude: $a_2^{(\rho)}= -0.10\pm 0.20 $ for a photon virtuality of $<Q^2 >=21.2$ GeV$^2$.We fitted the pi-pi mass distribution in the range 0.5 < mpipi < 1.1 GeV measured in hard exclusive positron-proton reactions at HERA by the form dictated by QCD at leading twist level. Extracted parameters are related to valence quark distribution in the pion, and to the pion and rho meson distribution amplitudes. We obtain, for the first time, a measurement of the second Gegenbauer coefficient of the rho meson distribution amplitude: $a_2^{(\rho)}= -0.10\pm 0.20 $ for a photon virtuality of <Q^2>=21.2 GeV^2.We fitted the pi-pi mass distribution in the range 0.5 < mpipi < 1.1 GeV measured in hard exclusive positron-proton reactions at HERA by the form dictated by QCD at leading twist level. Extracted parameters are related to valence quark distribution in the pion, and to the pion and rho meson distribution amplitudes. We obtain, for the first time, a measurement of the second Gegenbauer coefficient of the rho meson distribution amplitude: $a_2^{(\rho)}= -0.10\pm 0.20 $ for a photon virtuality of <Q^2>=21.2 GeV^2.We fitted the pi-pi mass distribution in the range 0.5 < mpipi < 1.1 GeV measured in hard exclusive positron-proton reactions at HERA by the form dictated by QCD at leading twist level. Extracted parameters are related to valence quark distribution in the pion, and to the pion and rho meson distribution amplitudes. We obtain, for the first time, a measurement of the second Gegenbauer coefficient of the rho meson distribution amplitude: $a_2^{(\rho)}= -0.10\pm 0.20 $ for a photon virtuality of <Q^2>=21.2 GeV^2.We fitted the ππ mass distribution in the range 0.5≤ M ππ ≤1.1 GeV measured in hard exclusive positron–proton reactions at HERA by the form dictated by QCD at leading twist level. Extracted parameters are related to valence quark distribution in the pion, and to the pion and ρ meson distribution amplitudes. We obtain, for the first time, a measurement of the second Gegenbauer coefficient of the ρ meson distribution amplitude: a 2 ( ρ ) =−0.10±0.20 for a photon virtuality of 〈 Q 2 〉=21.2 GeV 2 .hep-ph/0001332RUB-TP2-01-2000RUB-TP2-01-00RUB-TPII-01-00RUB-TP-2-2000-01oai:cds.cern.ch:4250062000-02-01
spellingShingle Particle Physics - Phenomenology
Clerbaux, B.
Polyakov, Maxim V.
Partonic structure of pi and rho mesons from data on hard (semi)exclusive production of two pions off nucleon
title Partonic structure of pi and rho mesons from data on hard (semi)exclusive production of two pions off nucleon
title_full Partonic structure of pi and rho mesons from data on hard (semi)exclusive production of two pions off nucleon
title_fullStr Partonic structure of pi and rho mesons from data on hard (semi)exclusive production of two pions off nucleon
title_full_unstemmed Partonic structure of pi and rho mesons from data on hard (semi)exclusive production of two pions off nucleon
title_short Partonic structure of pi and rho mesons from data on hard (semi)exclusive production of two pions off nucleon
title_sort partonic structure of pi and rho mesons from data on hard (semi)exclusive production of two pions off nucleon
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1016/S0375-9474(00)00337-7
http://cds.cern.ch/record/425006
work_keys_str_mv AT clerbauxb partonicstructureofpiandrhomesonsfromdataonhardsemiexclusiveproductionoftwopionsoffnucleon
AT polyakovmaximv partonicstructureofpiandrhomesonsfromdataonhardsemiexclusiveproductionoftwopionsoffnucleon

Ejemplares similares