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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/185666
Differential branching fraction and angular analysis of Λ {/b 0} → Λμ + μ - decays
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The differential branching fraction of the rare decay Λ 0 b → Λµ+µ − is measured as a function of q 2 , 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 q 2 region below the square of the J/ψ mass. Integrating over 15 < q2 < 20 GeV2/c4 the branching fraction is measured as dB(Λ 0 b → Λµ+µ −)/dq 2 = (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 0 b → J/ψ Λ, respectively. In the q 2 intervals where the signal is observed, angular distributions are studied and the forward-backward asymmetries in the dimuon (A` FB) and hadron (Ah FB) systems are measured for the first time. In the range 15 < q2 < 20 GeV2/c4 they are found to be A ` FB = −0.05 ± 0.09 (stat) ± 0.03 (syst) and A h FB = −0.29 ± 0.07 (stat) ± 0.03 (syst).
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LHCb collaboration, BADALOV, Alexey, CASANOVA MOHR, Raimon, GARRIDO BELTRÁN, Lluís, GASCÓN FORA, David, GRACIANI DÍAZ, Ricardo, GRAUGÉS POUS, Eugeni, MARIN BENITO, Carla, PICATOSTE OLLOQUI, Eduardo, RIVES MOLINA, Vicente josé, RUIZ, Hugo (ruiz pérez). Differential branching fraction and angular analysis of Λ {/b 0} → Λμ + μ - decays. _Journal of High Energy Physics_. 2015. Vol. 2015, núm. 115, pàgs. 1-33. [consulta: 23 de gener de 2026]. ISSN: 1126-6708. [Disponible a: https://hdl.handle.net/2445/185666]