Differential branching fraction and angular analysis of Λ 0b → Λμ+μ− decays
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| Title: | Differential branching fraction and angular analysis of Λ 0b → Λμ+μ− decays |
| Author: | LHCb Collaboration Adeva Andany, Bernardo Dosil Suárez, Álvaro Fernández Albor, Víctor Manuel Gallas Torreira, Abraham Antonio García Pardiñas, Julián Hernando Morata, José Ángel Plo Casasus, Máximo Romero Vidal, Antonio Saborido Silva, Juan José Sanmartín Sedes, Brais Santamarina Ríos, Cibrán Vázquez Regueiro, Pablo Vázquez Sierra, Carlos 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) |
| Subject: | Rare decay | Hadron-Hadron Scattering | Branching fraction | B physics | Flavour Changing Neutral Currents | |
| Date of Issue: | 2015 |
| Publisher: | Springer |
| Citation: | Aaij, R., Adeva, B., Adinolfi, M. et al. Differential branching fraction and angular analysis of Λ 0b → Λμ+μ− decays. J. High Energ. Phys. 2015, 115 (2015). https://doi.org/10.1007/JHEP06(2015)115 |
| Abstract: | The differential branching fraction of the rare decay Λ 0b → Λμ+μ− is measured as a function of q2, the square of the dimuon invariant mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment. Evidence of signal is observed in the q2 region below the square of the J/ψ mass. Integrating over 15 < q2 < 20 GeV2/c4 the differential branching fraction is measured as dB(Λ0b→Λμ+μ−)/dq2=(1.18+0.09−0.08±0.03±0.27)×10−7(GeV2/c4)−1, where the uncertainties are statistical, systematic and due to the normalisation mode, Λ 0b → J/ψΛ, respectively. In the q2 intervals where the signal is observed, angular distributions are studied and the forward-backward asymmetries in the dimuon (A ℓFB) and hadron (A hFB) systems are measured for the first time. In the range 15 < q2 < 20 GeV2/c4 they are found to be AℓFB=−0.05±0.09(stat)±0.03(syst)andAhFB=−0.29±0.07(stat)±0.03(syst). |
| Publisher version: | https://doi.org/10.1007/JHEP06(2015)115 |
| URI: | http://hdl.handle.net/10347/21984 |
| DOI: | 10.1007/JHEP06(2015)115 |
| ISSN: | 1029-8479 |
| Rights: | © CERN, for the benefit of the LHCb Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative CommonsAttribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. |
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Except where otherwise noted, this item's license is described as © CERN, for the benefit of the LHCb Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative CommonsAttribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.