Measurement of the ηc(1S) production cross-section in pp collisions at √s =13 TeV
| Parent link: | The European Physical Journal C Vol. 80, iss. 3.— 2020.— [191, 18 p.] |
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| Corporate Authors: | , |
| Other Authors: | , , , , , , |
| Summary: | Title screen Using a data sample corresponding to an integrated luminosity of 2.0 fb−1, collected by the LHCb experiment, the production of the ηc(1S) state in proton-proton collisions at a centre-of-mass energy of √s=13 TeV is studied in the rapidity range 2.0<y<4.5 and in the transverse momentum range 6.5<pT<14.0GeV. The cross-section for prompt production of ηc(1S) mesons relative to that of the J/ψJ/ψ meson is measured using the pp p¯¯¯p¯ decay mode and is found to be σηc(1S)/σJ/ψ=1.69±0.15±0.10±0.18. The quoted uncertainties are, in order, statistical, systematic and due to uncertainties on the branching fractions of the J/ψ→pp¯¯¯ and ηc→pp¯¯¯ decays. The prompt ηc(1S) production cross-section is determined to be σηc(1S)=1.26±0.11±0.08±0.14μb, where the last uncertainty includes that on the J/ψJ/ψ meson cross-section. The ratio of the branching fractions of bb-hadron decays to the ηc(1S)ηc(1S) and J/ψJ/ψ states is measured to be Bb→ηcX/Bb→J/ψX=0.48±0.03±0.03±0.05, where the last uncertainty is due to those on the branching fractions of the J/ψ→pp¯¯¯J/ψ→pp¯ and ηc→pp¯¯¯ηc→pp¯ decays. The difference between the J/ψJ/ψ and ηc(1S)ηc(1S) masses is also determined to be 113.0±0.7±0.1MeV, which is the most precise single measurement of this quantity to date. |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://doi.org/10.1140/epjc/s10052-020-7733-0 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=664727 |