arXiv subjects

J. L. Amey

Publications and source records attributed to J. L. Amey.

273 records · Page 16Linked to original sources

arXiv2021

Angular analysis of the rare decay $B_s^0\toϕμ^+μ^-$

An angular analysis of the rare decay $B^0_s\rightarrowϕμ^+μ^-$ is presented, using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of $7$, $8$ and $13~\rm{TeV}$, corresponding to an integrated luminosity of $8.4~\rm{fb}^{-1}$. The observables describing the angular distributions of the decay $B^0_s\rightarrowϕμ^+μ^-$ are determined in regions of $q^2$, the square of the dimuon invariant mass. The results are consistent with Standard Model predictions.

hep-ex↗

arXiv2021

Study of the $B_c^+$ decays into charmonia and three light hadrons

Using proton-proton collision data, corresponding to an integrated luminosity of $9fb^{-1}$ collected with the LHCb detector, seven decay modes of the $B_c^+$ meson into a $J/ψ$ or $ψ(2S)$ meson and three charged hadrons, kaons or pions, are studied. The decays $B_c^+\rightarrow ( ψ(2S) \rightarrow J/ψπ^+ π^-)π^+ $, $B_c^+\rightarrow ψ(2S)π^+π^+π^-$, $B_c^+\rightarrow J/ψK^+π^+π^-$ and $B_c^+\rightarrow K^+K^+K^-$ are observed for the first time, and evidence for the $B_c^+\rightarrow ψ(2S)K^+K^-π^+$ decay is found, where $J/ψ$ and $ψ(2S)$ mesons are reconstructed in their dimuon decay modes. The ratios of branching fractions between the different $B_c^+$ decays are reported as well as the fractions of the decays proceeding via intermediate resonances. The results largely support the factorisation approach used for a theoretical description of the studied decays.

hep-ex↗

arXiv2021

Observation of a $Λ_b^0-\overlineΛ_b^0$ production asymmetry in proton-proton collisions at $\sqrt{s} = 7 \textrm{ and } 8\,\textrm{TeV}$

This article presents differential measurements of the asymmetry between $Λ_b^0$ and $\overlineΛ_b^0$ baryon production rates in proton-proton collisions at centre-of-mass energies of $\sqrt{s}=7$ and $8\,\textrm{TeV}$ collected with the LHCb experiment, corresponding to an integrated luminosity of $3\,\textrm{fb}^{-1}$. The $Λ_b^0$ baryons are reconstructed through the inclusive semileptonic decay $Λ_b^0\rightarrowΛ_c^+μ^-\overlineν_μX$. The production asymmetry is measured both in intervals of rapidity in the range $2.15<y<4.10$ and transverse momentum in $2<p_T<27\,\textrm{GeV}/c$. The results are found to be incompatible with symmetric production with a significance of 5.8 standard deviations for both $\sqrt{s}=7$ and $8\,\textrm{TeV}$ data, assuming no $C\!P$ 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.

hep-ex↗