Hadron physics at the COMPASS experiment
Quantum Chromodynamics (QCD), the theory of strong interactions, in principle describes the interaction of quark and gluon fields. However, due to the self-coupling of the gluons, quarks and gluons are confined into hadrons and cannot exist as free particles. The quantitative understanding of this c...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2015-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | http://dx.doi.org/10.1051/epjconf/20159504033 |
| _version_ | 1819110326939942912 |
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| author | Krinner Fabian |
| author_facet | Krinner Fabian |
| author_sort | Krinner Fabian |
| collection | DOAJ |
| description | Quantum Chromodynamics (QCD), the theory of strong interactions, in principle describes the interaction of quark and gluon fields. However, due to the self-coupling of the gluons, quarks and gluons are confined into hadrons and cannot exist as free particles. The quantitative understanding of this confinement phenomenon, which is responsible for about 98% of the mass of the visible universe, is one of the major open questions in particle physics. The measurement of the excitation spectrum of hadrons and of their properties gives valuable input to theory and phenomenology.
In the Constituent Quark Model (CQM) two types of hadrons exist: mesons, made out of a quark and an antiquark, and baryons, which consist of three quarks. But more advanced QCD-inspired models and Lattice QCD calculations predict the existence of hadrons with exotic properties interpreted as excited glue (hybrids) or even pure gluonic bound states (glueballs).
The Compass experiment at the CERN Super Proton Synchrotron has acquired large data sets, which allow to study light-quark meson and baryon spectra in unprecedented detail. The presented overview of the first results from this data set focuses in particular on the light meson sector and presents a detailed analysis of three-pion final states. A new JPC = 1++ state, the a1(1420), is observed with a mass and width in the ranges m = 1412 − 1422MeV/c2 and Γ = 130 − 150MeV/c2. |
| first_indexed | 2024-12-22T03:39:57Z |
| format | Article |
| id | doaj.art-b81155e659414a04b34cb178f3e7333c |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-12-22T03:39:57Z |
| publishDate | 2015-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-b81155e659414a04b34cb178f3e7333c2022-12-21T18:40:16ZengEDP SciencesEPJ Web of Conferences2100-014X2015-01-01950403310.1051/epjconf/20159504033epjconf_icnfp2014_04033Hadron physics at the COMPASS experimentKrinner Fabian0Technische Universität München, Physik-Department, E18Quantum Chromodynamics (QCD), the theory of strong interactions, in principle describes the interaction of quark and gluon fields. However, due to the self-coupling of the gluons, quarks and gluons are confined into hadrons and cannot exist as free particles. The quantitative understanding of this confinement phenomenon, which is responsible for about 98% of the mass of the visible universe, is one of the major open questions in particle physics. The measurement of the excitation spectrum of hadrons and of their properties gives valuable input to theory and phenomenology. In the Constituent Quark Model (CQM) two types of hadrons exist: mesons, made out of a quark and an antiquark, and baryons, which consist of three quarks. But more advanced QCD-inspired models and Lattice QCD calculations predict the existence of hadrons with exotic properties interpreted as excited glue (hybrids) or even pure gluonic bound states (glueballs). The Compass experiment at the CERN Super Proton Synchrotron has acquired large data sets, which allow to study light-quark meson and baryon spectra in unprecedented detail. The presented overview of the first results from this data set focuses in particular on the light meson sector and presents a detailed analysis of three-pion final states. A new JPC = 1++ state, the a1(1420), is observed with a mass and width in the ranges m = 1412 − 1422MeV/c2 and Γ = 130 − 150MeV/c2.http://dx.doi.org/10.1051/epjconf/20159504033 |
| spellingShingle | Krinner Fabian Hadron physics at the COMPASS experiment EPJ Web of Conferences |
| title | Hadron physics at the COMPASS experiment |
| title_full | Hadron physics at the COMPASS experiment |
| title_fullStr | Hadron physics at the COMPASS experiment |
| title_full_unstemmed | Hadron physics at the COMPASS experiment |
| title_short | Hadron physics at the COMPASS experiment |
| title_sort | hadron physics at the compass experiment |
| url | http://dx.doi.org/10.1051/epjconf/20159504033 |
| work_keys_str_mv | AT krinnerfabian hadronphysicsatthecompassexperiment |