Observation of a Λ b 0 $$ {\varLambda}_b^0 $$ − Λ ¯ b 0 $$ {\overline{\varLambda}}_b^0 $$ production asymmetry in proton-proton collisions at s $$ \sqrt{s} $$ = 7 and 8 TeV
More than 100 authors
2021-10-07
Citation
Journal of High Energy Physics. 2021 Oct 07;2021(10):60
Abstract
Abstract This article presents differential measurements of the asymmetry between Λ b 0 $$ {\varLambda}_b^0 $$ and Λ ¯ b 0 $$ {\overline{\varLambda}}_b^0 $$ baryon production rates in proton-proton collisions at centre-of-mass energies of s $$ \sqrt{s} $$ = 7 and 8 TeV collected with the LHCb experiment, corresponding to an integrated luminosity of 3 fb−1. The Λ b 0 $$ {\varLambda}_b^0 $$ baryons are reconstructed through the inclusive semileptonic decay Λ b 0 $$ {\varLambda}_b^0 $$ → Λ c + $$ {\varLambda}_c^{+} $$ μ− ν ¯ $$ \overline{\nu} $$ μX. The production asymmetry is measured both in intervals of rapidity in the range 2.15 < y < 4.10 and transverse momentum in 2 < pT < 27 GeV/c. The results are found to be incompatible with symmetric production with a significance of 5.8 standard deviations for both s $$ \sqrt{s} $$ = 7 and 8 TeV data, assuming no CP violation in the decay. There is evidence for a trend as a function of rapidity with a significance of 4 standard deviations. Comparisons to predictions from hadronisation models in Pythia and heavy-quark recombination are provided. This result constitutes the first observation of a particle-antiparticle asymmetry in b-hadron production at LHC energies.Deep Blue DOI
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