In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2019, No. 12 ( 2019-12)
Kurzfassung:
A study of the $$ {\mathrm{B}}^{+}\to \mathrm{J}/\uppsi \overline{\Lambda}\mathrm{p} $$ B + → J / ψ Λ ¯ p decay using proton-proton collision data collected at $$ \sqrt{s} $$ s = 8 TeV by the CMS experiment at the LHC, corresponding to an integrated luminosity of 19 . 6 fb − 1 , is presented. The ratio of branching fractions $$ \mathcal{B}\left({\mathrm{B}}^{+}\to \mathrm{J}/\uppsi \overline{\Lambda}\mathrm{p}\right)/\mathcal{B}\left({\mathrm{B}}^{+}\to \mathrm{J}/{\uppsi \mathrm{K}}^{\ast }{(892)}^{+}\right) $$ B B + → J / ψ Λ ¯ p / B B + → J / ψK ∗ 892 + is measured to be (1 . 054 ± 0 . 057(stat) ± 0 . 035(syst) ± 0 . 011( $$ \mathcal{B} $$ B ))%, where the last uncertainty reflects the uncertainties in the world-average branching fractions of $$ \overline{\Lambda} $$ Λ ¯ and K * (892) + decays to reconstructed final states. The invariant mass distributions of the $$ \mathrm{J}/\uppsi \overline{\Lambda} $$ J / ψ Λ ¯ , J / ψp, and $$ \overline{\Lambda}\mathrm{p} $$ Λ ¯ p systems produced in the $$ {\mathrm{B}}^{+}\to \mathrm{J}/\uppsi \overline{\varLambda}\mathrm{p} $$ B + → J / ψ Λ ¯ p decay are investigated and found to be inconsistent with the pure phase space hypothesis. The analysis is extended by using a model-independent angular amplitude analysis, which shows that the observed invariant mass distributions are consistent with the contributions from excited kaons decaying to the $$ \overline{\Lambda}\mathrm{p} $$ Λ ¯ p system.
Materialart:
Online-Ressource
ISSN:
1029-8479
DOI:
10.1007/JHEP12(2019)100
Sprache:
Englisch
Verlag:
Springer Science and Business Media LLC
Publikationsdatum:
2019
ZDB Id:
2027350-2