arXiv subjects

M. J. Bradley

Publications and source records attributed to M. J. Bradley.

39 records · Page 3Linked to original sources

arXiv2020

Precision measurement of the $Ξ_{cc}^{++}$ mass

A measurement of the $Ξ_{cc}^{++}$ mass is performed using data collected by the LHCb experiment between 2016 and 2018 in $pp$ collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.6 $\mathrm{fb}^{-1}$. The $Ξ_{cc}^{++}$ candidates are reconstructed via the decay modes $Ξ_{cc}^{++}\toΛ_c^+K^-π^+π^+$ and $Ξ_{cc}^{++}\toΞ_c^+π^+$. The result, $3621.55 \pm 0.23{\rm\,(stat)\,} \pm 0.30 {\rm\,(syst)\,}{\rm MeV}/c^2$, is the most precise measurement of the $Ξ_{cc}^{++}$ mass to date.

hep-ex↗

arXiv2020

Measurement of $\mathitΞ_{cc}^{++}$ production in $pp$ collisions at $\sqrt{s}=13$ TeV

The production of $\mathitΞ_{cc}^{++}$ baryons in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV is measured in the transverse-momentum range $4<p_\mathrm{T}<15~\mathrm{GeV}$/$c$ and the rapidity range $2.0<y<4.5$. The data used in this measurement correspond to an integrated luminosity of 1.7 $\mathrm{fb}^{-1}$, recorded by the LHCb experiment during 2016. The ratio of the $\mathitΞ_{cc}^{++}$ production cross-section times the branching fraction of the $\mathit{Ξ_{cc}^{++} \to Λ_{c}^{+} K^- π^+ π^+}$ decay relative to the prompt $\mathit{Λ_c^{+}}$ production cross-section is found to be $(2.22\pm 0.27 \pm 0.29)\times 10^{-4}$, assuming the central value of the measured $\mathit{Ξ_{cc}^{++}}$ lifetime, where the first uncertainty is statistical and the second systematic.

hep-ex↗

arXiv2019

Measurement of the $B_c^-$ meson production fraction and asymmetry in 7 and 13 TeV $pp$ collisions

The production fraction of the $B_c^-$ meson with respect to the sum of $B^-$ and $\bar{B}^0$ mesons is measured in both 7 and 13 TeV center-of-mass energy $pp$ collisions produced by the Large Hadron Collider (LHC), using the LHCb detector. The rate, approximately 3.7 per mille, does not change with energy, but shows a transverse momentum dependence. The $B_c^- - B_c^+$ production asymmetry is also measured, and is consistent with zero within the determined statistical and systematic uncertainties of a few percent.

hep-ex↗