2026-03-25
09:05 |
$B$-jet fragmentation with $B^\pm \to J/\psi K^\pm$ decays in $\sqrt{s} = 13$ TeV $pp$ collisions at LHCb
/ LHCb Collaboration
- LHCb Collaboration.
The collinear and transverse-momentum-dependent jet fragmentation function and the radial profile for $B^{\pm}$ mesons in jets are measured. The $B^{\pm}$ mesons are reconstructed through the $J/\psi (\to \mu^{+} \mu^{-}) K^{\pm}$ decay channel using proton-proton collision data collected during 2016-2018 with the LHCb detector at a center-of-mass energy of $\sqrt{s}=13$ TeV, corresponding to an integrated luminosity of $5.4$ fb$^{-1}$. [...]
LHCb-PAPER-2025-061; CERN-EP-2026-027; CERN-EP-2026-027.-
Geneva : CERN, 2026 - 28 p.
Fulltext; Related data file(s); Submit a comment; Fulltext; 00005 Measured $(z, \jt)$ distributions in each \ptj bin. The measured quantity corresponds to the TMD JFF for \Bpm mesons. A growing contribution at low $z$ and high \jt can be observed with increasing \ptj.; 00006 Measured $(z, r)$ distributions in each \ptj bin. A growing contribution at low $z$ and high $r$ can be observed with increasing \ptj.; 00003 Measured \jt distributions (top panel) shown alongside simulation/data ratios (bottom panel) in each \ptj bin. In the top panels, the black points and bars correspond to the data points and statistical error bars, the shaded gray boxes correspond to the systematic uncertainties, and the blue points correspond to the prediction from \pythia 8.186.; 00004 Measured $r$ distributions (top panel) shown alongside simulation/data ratios (bottom panel) in each \ptj bin. In the top panels, the black points and bars correspond to the data points and statistical error bars, the shaded gray boxes correspond to the systematic uncertainties, and the blue points correspond to the prediction from \pythia 8.186.; 00001 Example of the invariant mass distribution of the \decay{\Bpm} {\jpsi \decay{(}{\mup \mun)} \Kpm} candidates within $8 < \ptB < 9$ \gevc. The data points are shown as black circles while the total fit model is shown as a red curve. The blue dashed line depicts the combinatorial background model, while the green dotted and purple dash-dotted lines highlight the signal and sideband regions.; 00002 Measured $z$ distributions (top panel) shown alongside simulation/data ratios (bottom panel) in each \ptj bin. Note that some points are outside of the displayed range in the bottom panel. In the top panels, the black points and bars correspond to the data points and statistical error bars, the shaded gray boxes correspond to the systematic uncertainties, and the blue points correspond to the prediction from \pythia 8.186. The measured quantity corresponds to the collinear JFF for \Bpm mesons.; 00000 Schematic of the collinear momentum fraction $z$, transverse momentum with respect to the jet axis \jt, and radial profile $r$ of a $\Bpm$ meson within a jet.; 00007 Measured $(\jt, r)$ distributions in each \ptj bin. A growing contribution at high \jt and high $r$ can be observed with increasing \ptj.
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Observation of $CP$ violation in $B^0 \to J/\psi \rho(770)^0$ decays
/ LHCb Collaboration
The time-dependent $C\!P$ asymmetry in $B^{0}\!\to{J\mskip-3mu/\mskip-2mu\psi}\rho(770)^0$ decays is measured using proton-proton collision data corresponding to an integrated luminosity of 6$fb^{-1}$ collected with the LHCb detector at a center-of-mass energy of 13 TeV during the years 2015–2018. [...]
LHCb-PAPER-2025-059 ; CERN-EP-2025-295 ; arXiv:2601.15646 ; LHCB-PAPER-2025-059.
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2026 - 21.
Fulltext - Related data file(s)
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