Study of charmonium production in b-hadron decays and first evidence for the decay B0s→ϕϕϕ
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Título: | Study of charmonium production in b-hadron decays and first evidence for the decay B0s→ϕϕϕ |
Autor/a: | LHCb Collaboration Adeva Andany, Bernardo Borsato, Martino Chobanova, Veronika Cid Vidal, Xabier Dosil Suárez, Álvaro Fernández Prieto, Antonio García Pardiñas, Julián Lemos Cid, Edgar Lucio Martínez, Miriam Martínez Santos, Diego Plo Casasus, Máximo Prisciandaro, Jessica Ramos Pernas, Miguel Romero Vidal, Antonio Saborido Silva, Juan José Sanmartín Sedes, Brais Santamarina Ríos, Cibrán Vázquez Regueiro, Pablo Vieites Díaz, María Vázquez Sierra, Carlos |
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: | 2017 |
Editor: | Springer |
Cita bibliográfica: | Aaij, R., Adeva, B., Adinolfi, M. et al. Study of charmonium production in b-hadron decays and first evidence for the decay B0s→ϕϕϕ . Eur. Phys. J. C 77, 609 (2017). https://doi.org/10.1140/epjc/s10052-017-5151-8 |
Resumo: | Using decays to φ-meson pairs, the inclusive production of charmonium states in b-hadron decays is studied with pp collision data corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. Denoting by BC ≡ B(b → CX) × B(C → φφ) the inclusive branching fraction of a b hadron to a charmonium state C that decays into a pair of φ mesons, ratios RC1 C2 ≡ BC1/BC2 are determined as Rχc0 ηc(1S) = 0.147 ± 0.023 ± 0.011, Rχc1 ηc(1S) = 0.073 ± 0.016 ± 0.006, Rχc2 ηc(1S) = 0.081 ± 0.013 ± 0.005, Rχc1 χc0 = 0.50 ± 0.11 ± 0.01, Rχc2 χc0 = 0.56 ± 0.10 ± 0.01 and Rηc(2S) ηc(1S) = 0.040 ± 0.011 ± 0.004. Here and below the first uncertainties are statistical and the second systematic. Upper limits at 90% confidence level for the inclusive production of X(3872), X(3915) and χc2(2P) states are obtained as RX(3872) χc1 < 0.34, RX(3915) χc0 < 0.12 and Rχc2(2P) χc2 < 0.16. Differential cross-sections as a function of transverse momentum are measured for the ηc(1S) and χc states. The branching fraction of the decay B0 s → φφφ is measured for the first time, B(B0 s → φφφ) = (2.15±0.54± 0.28±0.21B)×10−6. Here the third uncertainty is due to the branching fraction of the decay B0 s → φφ, which is used for normalization. No evidence for intermediate resonances is seen. A preferentially transverse φ polarization is observed. Themeasurements allow the determination of the ratio of the branching fractions for the ηc(1S) decays to φφ and p p as B(ηc(1S)→ φφ)/B(ηc(1S)→ p p) = 1.79 ± 0.14 ± 0.32. |
Versión do editor: | https://doi.org/10.1140/epjc/s10052-017-5151-8 |
URI: | http://hdl.handle.net/10347/22663 |
DOI: | 10.1140/epjc/s10052-017-5151-8 |
ISSN: | 1434-6044 |
E-ISSN: | 1434-6052 |
Dereitos: | © CERN for the benefit of the LHCb collaboration 2017. 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 2017. 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 2017. 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.