Measurement of the η[subscript c](1S) production cross-section in proton–proton collisions via the decay η[subscript c](1S) → p[bar over p]
The production of the η[subscript c](1S) state in proton-proton collisions is probed via its decay to the p[bar over p] final state with the LHCb detector, in the rapidity range 2.0 < y < 4.5 and in the meson transverse-momentum range p[subscript T] > 6.5 GeV/c. The cross-section for prompt...
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| Format: | Article |
| Language: | en_US |
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Springer-Verlag
2015
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| Online Access: | http://hdl.handle.net/1721.1/98244 https://orcid.org/0000-0001-8285-3346 https://orcid.org/0000-0002-4670-1334 https://orcid.org/0000-0001-5534-1732 |
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| author | Counts, Ian Thomas Hunt Williams, Michael Ilten, Philip J |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Counts, Ian Thomas Hunt Williams, Michael Ilten, Philip J |
| author_sort | Counts, Ian Thomas Hunt |
| collection | MIT |
| description | The production of the η[subscript c](1S) state in proton-proton collisions is probed via its decay to the p[bar over p] final state with the LHCb detector, in the rapidity range 2.0 < y < 4.5 and in the meson transverse-momentum range p[subscript T] > 6.5 GeV/c. The cross-section for prompt production of η[subscript c](1S) mesons relative to the prompt J/ψ cross-section is measured, for the first time, to be [superscript σ]η[subscript c](1S)/σ[subscript J/ψ] = 1.74 ± 0.29 ± 0.28 ± 0.18[subscript B] at a centre-of-mass energy √s = 7 TeV using data corresponding to an integrated luminosity of 0.7 fb[superscript −1], and [superscript σ]η[subscript c](1S)/σ[subscript J/ψ] = 1.60 ± 0.29 ± 0.25 ± 0.17[subscript B] at √s = 8 TeV using 2.0 fb[superscript −1]. The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the η[subscript c](1S) and J/ψ decays to the p[bar over p] final state. In addition, the inclusive branching fraction of b-hadron decays into η[subscript c](1S) mesons is measured, for the first time, to be B(b → η[subscript c]X) = (4.88 ± 0.64 ± 0.29 ± 0.67[subscript B]) × 10[superscript −3], where the third uncertainty includes also the uncertainty on the J/ψ inclusive branching fraction from b-hadron decays. The difference between the J/ψ and η[subscript c](1S) meson masses is determined to be 114.7 ± 1.5 ± 0.1 MeV/c[superscript 2]. |
| first_indexed | 2024-09-23T09:49:35Z |
| format | Article |
| id | mit-1721.1/98244 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T09:49:35Z |
| publishDate | 2015 |
| publisher | Springer-Verlag |
| record_format | dspace |
| spelling | mit-1721.1/982442023-02-26T10:56:04Z Measurement of the η[subscript c](1S) production cross-section in proton–proton collisions via the decay η[subscript c](1S) → p[bar over p] Counts, Ian Thomas Hunt Williams, Michael Ilten, Philip J Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Counts, Ian Thomas Hunt Ilten, Philip James Williams, Michael The production of the η[subscript c](1S) state in proton-proton collisions is probed via its decay to the p[bar over p] final state with the LHCb detector, in the rapidity range 2.0 < y < 4.5 and in the meson transverse-momentum range p[subscript T] > 6.5 GeV/c. The cross-section for prompt production of η[subscript c](1S) mesons relative to the prompt J/ψ cross-section is measured, for the first time, to be [superscript σ]η[subscript c](1S)/σ[subscript J/ψ] = 1.74 ± 0.29 ± 0.28 ± 0.18[subscript B] at a centre-of-mass energy √s = 7 TeV using data corresponding to an integrated luminosity of 0.7 fb[superscript −1], and [superscript σ]η[subscript c](1S)/σ[subscript J/ψ] = 1.60 ± 0.29 ± 0.25 ± 0.17[subscript B] at √s = 8 TeV using 2.0 fb[superscript −1]. The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the η[subscript c](1S) and J/ψ decays to the p[bar over p] final state. In addition, the inclusive branching fraction of b-hadron decays into η[subscript c](1S) mesons is measured, for the first time, to be B(b → η[subscript c]X) = (4.88 ± 0.64 ± 0.29 ± 0.67[subscript B]) × 10[superscript −3], where the third uncertainty includes also the uncertainty on the J/ψ inclusive branching fraction from b-hadron decays. The difference between the J/ψ and η[subscript c](1S) meson masses is determined to be 114.7 ± 1.5 ± 0.1 MeV/c[superscript 2]. National Science Foundation (U.S.) 2015-08-26T13:06:30Z 2015-08-26T13:06:30Z 2015-07 2014-09 Article http://purl.org/eprint/type/JournalArticle 1434-6044 1434-6052 http://hdl.handle.net/1721.1/98244 Aaij, R., C. Abellán Beteta, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, et al. “Measurement of the η[subscript c](1S) Production Cross-Section in Proton–proton Collisions via the Decay η[subscript c](1S) → p[bar over p].” The European Physical Journal C 75, no. 7 (July 2015). © 2015 CERN for the benefit of the LHCb collaboration https://orcid.org/0000-0001-8285-3346 https://orcid.org/0000-0002-4670-1334 https://orcid.org/0000-0001-5534-1732 en_US http://dx.doi.org/10.1140/epjc/s10052-015-3502-x The European Physical Journal C Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ application/pdf Springer-Verlag Springer-Verlag |
| spellingShingle | Counts, Ian Thomas Hunt Williams, Michael Ilten, Philip J Measurement of the η[subscript c](1S) production cross-section in proton–proton collisions via the decay η[subscript c](1S) → p[bar over p] |
| title | Measurement of the η[subscript c](1S) production cross-section in proton–proton collisions via the decay η[subscript c](1S) → p[bar over p] |
| title_full | Measurement of the η[subscript c](1S) production cross-section in proton–proton collisions via the decay η[subscript c](1S) → p[bar over p] |
| title_fullStr | Measurement of the η[subscript c](1S) production cross-section in proton–proton collisions via the decay η[subscript c](1S) → p[bar over p] |
| title_full_unstemmed | Measurement of the η[subscript c](1S) production cross-section in proton–proton collisions via the decay η[subscript c](1S) → p[bar over p] |
| title_short | Measurement of the η[subscript c](1S) production cross-section in proton–proton collisions via the decay η[subscript c](1S) → p[bar over p] |
| title_sort | measurement of the η subscript c 1s production cross section in proton proton collisions via the decay η subscript c 1s p bar over p |
| url | http://hdl.handle.net/1721.1/98244 https://orcid.org/0000-0001-8285-3346 https://orcid.org/0000-0002-4670-1334 https://orcid.org/0000-0001-5534-1732 |
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