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http://hdl.handle.net/10347/22664
Título: | Test of lepton universality with B0 → K *0 ℓ + ℓ − decays
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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
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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)
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Palabras chave: | B physics | Branching fraction | Hadron-Hadron scattering (experiments) | Rare decay | |
Data: | 2017
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Editor: | Springer
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Cita bibliográfica: | Aaij, R., Adeva, B., Adinolfi, M. et al. Test of lepton universality with B0 → K *0 ℓ + ℓ − decays. J. High Energ. Phys. 2017, 55 (2017). https://doi.org/10.1007/JHEP08(2017)055
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Resumo: | A test of lepton universality, performed by measuring the ratio of the branching fractions of the B 0 → K *0 μ + μ − and B 0 → K *0 e + e − decays, RK∗0, is presented. The K *0 meson is reconstructed in the final state K + π −, which is required to have an invariant mass within 100 MeV/c 2 of the known K *(892)0 mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of about 3 fb−1, collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The ratio is measured in two regions of the dilepton invariant mass squared, q 2, to be
RK∗0={0.66+−0.110.07(stat)±0.03(syst)for0.045<q2<1.1GeV2/c4,0.69+−0.110.07(stat)±0.05(syst)for1.1<q2<6.0GeV2/c4.
The corresponding 95.4% confidence level intervals are [0.52, 0.89] and [0.53, 0.94]. The results, which represent the most precise measurements of RK∗0 to date, are compatible with the Standard Model expectations at the level of 2.1–2.3 and 2.4–2.5 standard deviations in the two q 2 regions, respectively. |
Versión do editor: | https://doi.org/10.1007/JHEP08(2017)055 |
URI: | http://hdl.handle.net/10347/22664
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DOI: | 10.1007/JHEP08(2017)055 |
ISSN: | 1029-8479
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Dereitos: | © CERN, for the benefit of the LHCb Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as 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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