An analysis of the angular distribution of the decay Λ0b → Λ μ+ μ− is presented, using data collected with the LHCb detector between 2011 and 2016 and corresponding to an integrated luminosity of approximately 5 fb^−1. Angular observables are determined using a moment analysis of the angular distribution at low hadronic recoil, corresponding to the dimuon invariant mass squared range 15 < q^2 < 20 GeV^2/c^4. The full basis of observables is measured for the first time. The lepton-side, hadron-side and combined forward-backward asymmetries of the decay are determined to be A_FB^ℓ = −0.39 ± 0.04(stat) ± 0.01(syst), A_FB^h = −0.30 ± 0.05(stat) ± 0.02(syst), A_FB^ℓh = +0.25 ± 0.04(stat) ± 0.01(syst). The measurements are consistent with Standard Model predictions.

Aaij, R., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., Akar, S., et al. (2018). Angular Moments of the Decay Λ0b → Λ μ+ μ− at Low Hadronic Recoil. JOURNAL OF HIGH ENERGY PHYSICS, 2018(9), 0-26 [10.1007/JHEP09(2018)146].

Angular Moments of the Decay Λ0b → Λ μ+ μ− at Low Hadronic Recoil

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Perazzini, S.;Pisani, F.;Vagnoni, V.;Zucchelli, S.
2018

Abstract

An analysis of the angular distribution of the decay Λ0b → Λ μ+ μ− is presented, using data collected with the LHCb detector between 2011 and 2016 and corresponding to an integrated luminosity of approximately 5 fb^−1. Angular observables are determined using a moment analysis of the angular distribution at low hadronic recoil, corresponding to the dimuon invariant mass squared range 15 < q^2 < 20 GeV^2/c^4. The full basis of observables is measured for the first time. The lepton-side, hadron-side and combined forward-backward asymmetries of the decay are determined to be A_FB^ℓ = −0.39 ± 0.04(stat) ± 0.01(syst), A_FB^h = −0.30 ± 0.05(stat) ± 0.02(syst), A_FB^ℓh = +0.25 ± 0.04(stat) ± 0.01(syst). The measurements are consistent with Standard Model predictions.
2018
Aaij, R., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., Akar, S., et al. (2018). Angular Moments of the Decay Λ0b → Λ μ+ μ− at Low Hadronic Recoil. JOURNAL OF HIGH ENERGY PHYSICS, 2018(9), 0-26 [10.1007/JHEP09(2018)146].
Aaij, R.; Adeva, B.; Adinolfi, M.; Aidala, C.A.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; Albrecht, J.; Alessio, F.; Alexander, M.; Alfonso Albero, A.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/649664
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