Measurement of the ηc(1S) production cross-section in proton–proton collisions via the decay ηc(1S)→pp
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Título: | Measurement of the ηc(1S) production cross-section in proton–proton collisions via the decay ηc(1S)→pp |
Autor/a: | LHCb Collaboration Adeva Andany, Bernardo Álvarez Cartelle, Paula Dosil Suárez, Álvaro Fernández Albor, Víctor Manuel Gallas Torreira, Abraham Antonio García Pardiñas, Julián Hernando Morata, José Ángel Pazos Álvarez, Antonio Pérez Trigo, Eliseo Plo Casasus, Máximo Romero Vidal, Antonio Saborido Silva, Juan José Sanmartín Sedes, Brais Santamarina Ríos, Cibrán Seco Miguélez, Marcos Antonio Vázquez Regueiro, Pablo Vázquez Sierra, Carlos Vieites Díaz, María |
Centro/Departamento: | Universidade de Santiago de Compostela. Departamento de Física de Partículas Universidade de Santiago de Compostela. Instituto Galego de Física de Altas Enerxías (IGFAE) |
Data: | 2015 |
Editor: | Springer |
Cita bibliográfica: | Aaij, R., Beteta, C.A., Adeva, B. et al. Measurement of the ηc(1S) production cross-section in proton–proton collisions via the decay ηc(1S)→pp. Eur. Phys. J. C 75, 311 (2015). https://doi.org/10.1140/epjc/s10052-015-3502-x |
Resumo: | The production of the ηc(1S) state in proton-proton collisions is probed via its decay to the pp final state with the LHCb detector, in the rapidity range 2.0<y<4.5 and in the meson transverse-momentum range pT>6.5GeV/c. The cross-section for prompt production of ηc(1S) mesons relative to the prompt J/ψ cross-section is measured, for the first time, to be σηc(1S)/σJ/ψ=1.74±0.29±0.28±0.18B at a centre-of-mass energy s√=7 TeV using data corresponding to an integrated luminosity of 0.7 fb−1, and σηc(1S)/σJ/ψ=1.60±0.29±0.25±0.17B at s√=8 TeV using 2.0 fb−1. The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the ηc(1S) and J/ψ decays to the pp final state. In addition, the inclusive branching fraction of b-hadron decays into ηc(1S) mesons is measured, for the first time, to be B(b→ηcX)=(4.88±0.64±0.29±0.67B)×10−3, 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 ηc(1S) meson masses is determined to be 114.7±1.5±0.1MeV/c2. |
Versión do editor: | https://doi.org/10.1140/epjc/s10052-015-3502-x |
URI: | http://hdl.handle.net/10347/21626 |
DOI: | 10.1140/epjc/s10052-015-3502-x |
ISSN: | 1434-6044 |
E-ISSN: | 1434-6052 |
Dereitos: | © CERN for the benefit of the LHCb collaboration 2015. This article is published with open access at Springerlink.com. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
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© CERN for the benefit of the LHCb collaboration 2015. This article is published with open access at Springerlink.com. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
© CERN for the benefit of the LHCb collaboration 2015. This article is published with open access at Springerlink.com. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.