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Measurement of azimuthal asymmetries in SIDIS on unpolarized protons

The COMPASS Collaboration is measuring the asymmetries in the azimuthal distributions of positive and negative hadrons produced in Deep Inelastic Scattering (DIS) on unpolarized protons. The data have been collected in 2016 and 2017 with a 160 GeV/$c$ muon beam scattering off a liquid hydrogen targe...

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Autor principal: Moretti, Andrea
Lenguaje:eng
Publicado: SISSA 2019
Materias:
Acceso en línea:https://dx.doi.org/10.22323/1.346.0052
http://cds.cern.ch/record/2654200
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author Moretti, Andrea
author_facet Moretti, Andrea
author_sort Moretti, Andrea
collection CERN
description The COMPASS Collaboration is measuring the asymmetries in the azimuthal distributions of positive and negative hadrons produced in Deep Inelastic Scattering (DIS) on unpolarized protons. The data have been collected in 2016 and 2017 with a 160 GeV/$c$ muon beam scattering off a liquid hydrogen target. The amplitudes of three modulations, $A_{UU}^{\cos\phi_h}$, $A_{UU}^{\cos 2\phi_h}$ and $A_{LU}^{\sin\phi_h}$ are measured as function of the Bjorken variable $x$, of the fraction of virtual photon energy carried by the hadron $z$, and of the hadron transverse momentum with respect to the virtual photon $p_{T}^{h}$. The relevance of azimuthal asymmetries lies in the possibility to get information on the intrinsic transverse momentum of the quark as well as on the still unknown Boer-Mulders parton distribution function. The preliminary results from 2016 data shown here confirm the strong kinematic dependencies observed in previous measurements conducted by COMPASS, HERMES and CLAS.
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institution Organización Europea para la Investigación Nuclear
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publishDate 2019
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spelling cern-26542002019-09-30T06:29:59Zdoi:10.22323/1.346.0052http://cds.cern.ch/record/2654200engMoretti, AndreaMeasurement of azimuthal asymmetries in SIDIS on unpolarized protonshep-phParticle Physics - Phenomenologyhep-exParticle Physics - ExperimentThe COMPASS Collaboration is measuring the asymmetries in the azimuthal distributions of positive and negative hadrons produced in Deep Inelastic Scattering (DIS) on unpolarized protons. The data have been collected in 2016 and 2017 with a 160 GeV/$c$ muon beam scattering off a liquid hydrogen target. The amplitudes of three modulations, $A_{UU}^{\cos\phi_h}$, $A_{UU}^{\cos 2\phi_h}$ and $A_{LU}^{\sin\phi_h}$ are measured as function of the Bjorken variable $x$, of the fraction of virtual photon energy carried by the hadron $z$, and of the hadron transverse momentum with respect to the virtual photon $p_{T}^{h}$. The relevance of azimuthal asymmetries lies in the possibility to get information on the intrinsic transverse momentum of the quark as well as on the still unknown Boer-Mulders parton distribution function. The preliminary results from 2016 data shown here confirm the strong kinematic dependencies observed in previous measurements conducted by COMPASS, HERMES and CLAS.SISSAarXiv:1901.01773oai:cds.cern.ch:26542002019-01-07
spellingShingle hep-ph
Particle Physics - Phenomenology
hep-ex
Particle Physics - Experiment
Moretti, Andrea
Measurement of azimuthal asymmetries in SIDIS on unpolarized protons
title Measurement of azimuthal asymmetries in SIDIS on unpolarized protons
title_full Measurement of azimuthal asymmetries in SIDIS on unpolarized protons
title_fullStr Measurement of azimuthal asymmetries in SIDIS on unpolarized protons
title_full_unstemmed Measurement of azimuthal asymmetries in SIDIS on unpolarized protons
title_short Measurement of azimuthal asymmetries in SIDIS on unpolarized protons
title_sort measurement of azimuthal asymmetries in sidis on unpolarized protons
topic hep-ph
Particle Physics - Phenomenology
hep-ex
Particle Physics - Experiment
url https://dx.doi.org/10.22323/1.346.0052
http://cds.cern.ch/record/2654200
work_keys_str_mv AT morettiandrea measurementofazimuthalasymmetriesinsidisonunpolarizedprotons