Evidence for an ηc(1S)π− resonance in B0 → ηc(1S)K+π− decays
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| Title: | Evidence for an ηc(1S)π− resonance in B0 → ηc(1S)K+π− decays |
| Author: | LHCb Collaboration Adeva Andany, Bernardo Alves Junior, Antonio Augusto Boente García, Óscar Borsato, Martino Chobanova, Veronika Cid Vidal, Xabier Dosil Suárez, Álvaro Fernández Prieto, Antonio Gallas Torreira, Abraham Antonio García Plana, Beatriz Lucio Martínez, Miriam Martínez Santos, Diego Plo Casasus, Máximo Prisciandaro, James J. Ramos Pernas, Miguel Romero Vidal, Antonio Saborido Silva, Juan José Sanmartín Sedes, Brais Santamarina Ríos, Cibrán Vázquez Regueiro, Pablo Vieites Díaz, María |
| Affiliation: | Universidade de Santiago de Compostela. Departamento de Física de Partículas Universidade de Santiago de Compostela. Instituto Galego de Física de Altas Enerxías (IGFAE) |
| Date of Issue: | 2018 |
| Publisher: | Springer |
| Citation: | Aaij, R., Beteta, C.A., Adeva, B. et al. Evidence for an ηc(1S)π− resonance in B0 → ηc(1S)K+π− decays. Eur. Phys. J. C 78, 1019 (2018). https://doi.org/10.1140/epjc/s10052-018-6447-z |
| Abstract: | A Dalitz plot analysis of B0 → ηc(1S)K +π− decays is performed using data samples of pp collisions collected with the LHCb detector at centre-of-mass energies of √s = 7, 8 and 13 TeV, corresponding to a total integrated luminosity of 4.7 fb−1. A satisfactory description of the data is obtained when including a contribution representing an exotic ηc(1S)π− resonant state. The significance of this exotic resonance is more than three standard deviations, while its mass and width are 4096 ± 20 +18 −22 MeV and 152±58 +60 −35 MeV, respectively. The spin-parity assignments J P = 0+ and J P = 1− are both consistent with the data. In addition, the first measurement of the B0 → ηc(1S)K +π− branching fraction is performed and gives B(B0→ ηc(1S)K +π−) = (5.73 ± 0.24 ± 0.13 ± 0.66) × 10−4, where the first uncertainty is statistical, the second systematic, and the third is due to limited knowledge of external branching fractions |
| Publisher version: | https://doi.org/10.1140/epjc/s10052-018-6447-z |
| URI: | http://hdl.handle.net/10347/22298 |
| DOI: | 10.1140/epjc/s10052-018-6447-z |
| ISSN: | 1434-6044 |
| E-ISSN: | 1434-6052 |
| Rights: | © CERN for the benefit of the LHCb collaboration 2018. 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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Except where otherwise noted, this item's license is described as © CERN for the benefit of the LHCb collaboration 2018. 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.