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Observation of the χc1(1P) and χc2(1P) charmonium states in √s = 7 TeV pp collisions at the ATLAS experiment
We present the observation of the χc1 (1P) and χc2 (1P) charmonium states in χc → J/ψ γ decays in ATLAS using pp collision data at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 39 pb−1. J/ψ candidates are reconstructed from the decay J/ψ → μ+μ− while photons are recon...
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| Lenguaje: | eng |
| Publicado: |
2011
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| Acceso en línea: | http://cds.cern.ch/record/1383839 |
| _version_ | 1780923163241086976 |
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| author | The ATLAS collaboration |
| author_facet | The ATLAS collaboration |
| author_sort | The ATLAS collaboration |
| collection | CERN |
| description | We present the observation of the χc1 (1P) and χc2 (1P) charmonium states in χc → J/ψ γ decays in ATLAS using pp collision data at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 39 pb−1. J/ψ candidates are reconstructed from the decay J/ψ → μ+μ− while photons are reconstructed with a calorimetric measurements. χc candidates are observed in the kinematic range pT(χc) > 10 GeV and rapidity |y(χc)| < 2.4. An extended unbinned maximum likelihood fit is performed to the invariant mass difference of the μ+μ− and μ+μ−γ systems to yield 2960 ± 120 (stat.) ± 90 (syst.) χc1 and χc2 candidates. |
| id | cern-1383839 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2011 |
| record_format | invenio |
| spelling | cern-13838392021-04-18T19:37:19Zhttp://cds.cern.ch/record/1383839engThe ATLAS collaborationObservation of the χc1(1P) and χc2(1P) charmonium states in √s = 7 TeV pp collisions at the ATLAS experimentDetectors and Experimental TechniquesWe present the observation of the χc1 (1P) and χc2 (1P) charmonium states in χc → J/ψ γ decays in ATLAS using pp collision data at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 39 pb−1. J/ψ candidates are reconstructed from the decay J/ψ → μ+μ− while photons are reconstructed with a calorimetric measurements. χc candidates are observed in the kinematic range pT(χc) > 10 GeV and rapidity |y(χc)| < 2.4. An extended unbinned maximum likelihood fit is performed to the invariant mass difference of the μ+μ− and μ+μ−γ systems to yield 2960 ± 120 (stat.) ± 90 (syst.) χc1 and χc2 candidates.ATLAS-CONF-2011-136oai:cds.cern.ch:13838392011-09-20 |
| spellingShingle | Detectors and Experimental Techniques The ATLAS collaboration Observation of the χc1(1P) and χc2(1P) charmonium states in √s = 7 TeV pp collisions at the ATLAS experiment |
| title | Observation of the χc1(1P) and χc2(1P) charmonium states in √s = 7 TeV pp collisions at the ATLAS experiment |
| title_full | Observation of the χc1(1P) and χc2(1P) charmonium states in √s = 7 TeV pp collisions at the ATLAS experiment |
| title_fullStr | Observation of the χc1(1P) and χc2(1P) charmonium states in √s = 7 TeV pp collisions at the ATLAS experiment |
| title_full_unstemmed | Observation of the χc1(1P) and χc2(1P) charmonium states in √s = 7 TeV pp collisions at the ATLAS experiment |
| title_short | Observation of the χc1(1P) and χc2(1P) charmonium states in √s = 7 TeV pp collisions at the ATLAS experiment |
| title_sort | observation of the χc1(1p) and χc2(1p) charmonium states in √s = 7 tev pp collisions at the atlas experiment |
| topic | Detectors and Experimental Techniques |
| url | http://cds.cern.ch/record/1383839 |
| work_keys_str_mv | AT theatlascollaboration observationofthechc11pandchc21pcharmoniumstatesins7tevppcollisionsattheatlasexperiment |