Usai, E. (2012) Measurement of the production cross-section ratio of the charmonium states χc2 and χc1 in proton-proton collisions at 7TeV with CMS. Il nuovo cimento C, 35 (5). pp. 31-37. ISSN 1826-9885
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Abstract
This paper presents the observation of the χc resonances and the techniques for the measurement of the σ(pp → χc2 + X)/σ(pp → χc1 + X) ratio with the CMS detector at LHC. The measurement was performed with 4.0 fb−1 of pp collisions at √s = 7TeV collected in 2011. The χc mesons are observed through their radiative decay χc → J/ψ γ. The J/ψ were reconstructed through their μ+μ− decay while the photons were reconstructed through conversions in e+e− pairs in the CMS inner tracker. The kinematic range covered is |yJ/ψ| < 1, 7 GeV/c < pT J/ψ < 25 GeV/c and Eγ > 0.5 GeV. Thanks to the excellent performance of the CMS tracking system, a very good separation between the two resonances is achieved.
| Item Type: | Article |
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| Uncontrolled Keywords: | Decays of J/ψ, Υ, and other quarkonia ; Heavy quarkonia ; Experimental tests |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 24 Apr 2020 16:00 |
| Last Modified: | 24 Apr 2020 16:00 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/17927 |
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