An analysis of the angular distribution of the decay Lambda(0)(b) -> Lambda mu(+)mu(-) 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 GeV2/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), AFB(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.a., Ajaltouni, Z., Akar, S., et al. (2018). Angular moments of the decay Lambda(0)(b) -> Lambda mu(+)mu(-) at low hadronic recoil. JOURNAL OF HIGH ENERGY PHYSICS(9) [10.1007/JHEP09(2018)146].

Angular moments of the decay Lambda(0)(b) -> Lambda mu(+)mu(-) at low hadronic recoil

Archilli, F.;Santovetti, E.
Membro del Collaboration Group
;
2018-01-01

Abstract

An analysis of the angular distribution of the decay Lambda(0)(b) -> Lambda mu(+)mu(-) 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 GeV2/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), AFB(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
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
English
B physics; FCNC Interaction; Flavor physics; Hadron-Hadron scattering; (experiments); Rare decay; TOOL
Aaij, R., Adeva, B., Adinolfi, M., Aidala, C.a., Ajaltouni, Z., Akar, S., et al. (2018). Angular moments of the decay Lambda(0)(b) -> Lambda mu(+)mu(-) at low hadronic recoil. JOURNAL OF HIGH ENERGY PHYSICS(9) [10.1007/JHEP09(2018)146].
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