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Recent results from COMPASS

The COMPASS experiment at CERN is studying since 2002 the spin structure of the nucleon, both for longitudinal and transverse nucleon spin. In the first case, the measurements of DIS and SIDIS asymmetries, including also high-$p_{T}$ hadron production and $D^{0}$ mesons, allow to access the nucleon...

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Autor principal: Bressan, Andrea
Lenguaje:eng
Publicado: 2011
Materias:
Acceso en línea:https://dx.doi.org/10.1088/1742-6596/295/1/012010
http://cds.cern.ch/record/1494624
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author Bressan, Andrea
author_facet Bressan, Andrea
author_sort Bressan, Andrea
collection CERN
description The COMPASS experiment at CERN is studying since 2002 the spin structure of the nucleon, both for longitudinal and transverse nucleon spin. In the first case, the measurements of DIS and SIDIS asymmetries, including also high-$p_{T}$ hadron production and $D^{0}$ mesons, allow to access the nucleon longitudinal PDFs, their first moments and the gluon polarization. The LO analysis, performed by COMPASS have shown that $\Delta g/g$ is small around $x_{g}\simeq 0.1$, and its first moment should not be larger than 0.2 $−$ 0.3 in absolute value. Transverse spin effects have rised large interest in the last 10 years and the measurements performed have shown evidence for new phenomena, associated with transverse momentum dependent distribution and fragmentation functions. Collins and Sivers asymmetries obtained by COMPASS on a proton target, together with the latest results on unpolarized modulations on the deuterated $^{6}$Li target will be shown here.
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institution Organización Europea para la Investigación Nuclear
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publishDate 2011
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spelling cern-14946242022-08-17T13:30:06Zdoi:10.1088/1742-6596/295/1/012010http://cds.cern.ch/record/1494624engBressan, AndreaRecent results from COMPASSParticle Physics - ExperimentThe COMPASS experiment at CERN is studying since 2002 the spin structure of the nucleon, both for longitudinal and transverse nucleon spin. In the first case, the measurements of DIS and SIDIS asymmetries, including also high-$p_{T}$ hadron production and $D^{0}$ mesons, allow to access the nucleon longitudinal PDFs, their first moments and the gluon polarization. The LO analysis, performed by COMPASS have shown that $\Delta g/g$ is small around $x_{g}\simeq 0.1$, and its first moment should not be larger than 0.2 $−$ 0.3 in absolute value. Transverse spin effects have rised large interest in the last 10 years and the measurements performed have shown evidence for new phenomena, associated with transverse momentum dependent distribution and fragmentation functions. Collins and Sivers asymmetries obtained by COMPASS on a proton target, together with the latest results on unpolarized modulations on the deuterated $^{6}$Li target will be shown here.oai:cds.cern.ch:14946242011
spellingShingle Particle Physics - Experiment
Bressan, Andrea
Recent results from COMPASS
title Recent results from COMPASS
title_full Recent results from COMPASS
title_fullStr Recent results from COMPASS
title_full_unstemmed Recent results from COMPASS
title_short Recent results from COMPASS
title_sort recent results from compass
topic Particle Physics - Experiment
url https://dx.doi.org/10.1088/1742-6596/295/1/012010
http://cds.cern.ch/record/1494624
work_keys_str_mv AT bressanandrea recentresultsfromcompass