U. De Freitas Carneiro Da Graca

activity

20222026

most citedTest of lepton universality in

b \to s ℓ^{+} ℓ^{-}

decays

126 citations · 774 across the 42 of their papers we have counts for

collaborators

49 papers

hep-ex2026

Evidence for the decay $B^{0} \to μ^{+} μ^{-}$ and improved measurements of the decay $B_{s}^{0} \to μ^{+} μ^{-}$

LHCb collaboration, R. Aaij, M. Abdelfatah +1165

The first single-experiment evidence for the rare decay $B^{0} \to μ^{+} μ^{-}$ and the world's most precise measurements of the $B_{s}^{0} \to μ^{+} μ^{-}$ branching fraction and effective life…

hep-ex2026

Search for $GeV$ -scale axion-like particles in PbPb collisions

LHCb collaboration, R. Aaij, M. Abdelfatah +1161

A search is performed for the production of axion-like particles with masses in the range 3-10 GeV using PbPb collision data recorded by the LHCb experiment, corresponding to an in…

hep-ex2026

Observation of the $Ξ_{b}^{-} \to Ξ^{-} μ^{+} μ^{-}$ and study of the $Ξ_{b}^{-} \to Ξ^{-} ψ (2 S)$ decays

LHCb collaboration, R. Aaij, M. Abdelfatah +1161

The rare decay $Ξ_{b}^{-} \to Ξ^{-} μ^{+} μ^{-}$ is observed for the first time using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of $7$ , $8$ and~$…

hep-ex2026

Energy-energy correlators within $Z$ -tagged jets in proton-proton collisions at $s$ = 13 TeV

LHCb collaboration, R. Aaij, M. Abdelfatah +1161

Energy-energy correlators probe perturbative and nonperturbative QCD regimes of jet formation through momentum-weighted angular correlations between hadrons. First measurements in…

hep-ex2026

Branching fraction measurement of the $B^{0} \to K^{+} π^{-} μ^{+} μ^{-}$ decay at high dihadron mass

LHCb collaboration, R. Aaij, M. Abdelfatah +1103

This Letter presents the first measurement of the $B^{0} \to K^{+} π^{-} μ^{+} μ^{-}$ differential branching fraction in the region of the dihadron $K^{+} π^{-}$ mass, $m_{K π}$ , $1000< m_{…

hep-ex2026

First measurement of the forward rapidity dependence of $W$ boson transverse helicity fractions

LHCb collaboration, R. Aaij, M. Abdelfatah +1160

The transverse helicity fractions of $W$ bosons are measured as a function of the $W$ boson rapidity, $y_{W}$ , in the range $0 \leq y_{W} \leq 5$ using $W \to μ ν_{μ}$ decays in $pp$ co…

hep-ex2026

Measurement of the $Ω_{b}^{-}$ baryon lifetime

LHCb collaboration, R. Aaij, M. Abdelfatah +1160

The lifetime ratio $r_{τ} \equiv τ_{Ω_{b}^{-}} / τ_{Ξ_{b}^{-}}$ between the $Ω_{b}^{-}$ and $Ξ_{b}^{-}$ baryons is measured using a sample of $pp$ collision data corresponding to an integrated lum…

hep-ex2026

Discovery of an unexpectedly light and narrow beauty-strange state

LHCb collaboration, R. Aaij, M. Abdelfatah +1152

As the essential building blocks of visible matter, hadrons have traditionally been classified by the quark model as mesons composed of quark-antiquark pairs and baryons built from…

hep-ex2026

Observation of the doubly charmed baryon $Ω_{cc}^{+}$

LHCb collaboration, R. Aaij, M. Abdelfatah +1153

A search for the doubly charmed baryon $Ω_{cc}^{+}$ in the $Ω_{c}^{0} π^{+}$ decay channel is performed using proton-proton collision data corresponding to an integrated lum…

hep-ex2026

Observation of $Ξ_{b}^{0} \to Ξ^{0} J / ψ$ and evidence for $Ξ_{b}^{0} \to Ξ^{0} ψ (2 S)$ decays

LHCb collaboration, R. Aaij, M. Abdelfatah +1159

The first search for the beauty baryon decays $Ξ_{b}^{0} \to Ξ^{0} J / ψ$ and $Ξ_{b}^{0} \to Ξ^{0} ψ (2 S)$ is presented using the proton-proton collision dataset collected by the LHCb…

hep-ex2026

Stringent limits on $C P T$ - and Lorentz-invariance violation from $B_{s}^{0}$ meson decays

LHCb collaboration, R. Aaij, M. Abdelfatah +1161

Tests of fundamental symmetries, such as $C P T$ and Lorentz invariance, provide sensitive probes of physics beyond the standard quantum-field-theory framework. Possible violations…

hep-ex2026

First measurement of the ratio of $ψ (2 S)$ -to- $J / ψ$ inclusive production in $p Ar$ and $pp$ collisions at $s_{NN} = 113 GeV$ with SMOG2

LHCb collaboration, R. Aaij, M. Abdelfatah +1162

A measurement of the $ψ (2 S)$ -to- $J / ψ$ production cross-section ratio is performed in proton-argon ( $p Ar$ ) and proton-proton ( $pp$ ) collisions in fixed-target mode at $\sqr…

hep-ex2026

Observation of the $Ξ_{c}^{0} \to p K^{-}$ decay and measurement of its decay asymmetry

LHCb collaboration, R. Aaij, M. Abdelfatah +1154

A search for the Cabibbo-suppressed decay $Ξ_{c}^{0} \to p K^{-}$ is performed using $pp$ collision data corresponding to an integrated luminosity of $5.4 fb^{- 1}$ , collected by…

hep-ex2025★ 1 cited

Improved measurement of $η / η^{'}$ mixing in $B_{(s)}^{0} \to J / ψ η^{(')}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1182

Branching fraction ratios between the decays $B_{(s)}^{0} \to J / ψ η^{(')}$ are measured using proton-proton collision data collected by the LHCb experiment at centre-of…

hep-ex2025★ 6 cited

Observation of the doubly-charmed-baryon decay $Ξ_{cc}^{++} \to Ξ_{c}^{0} π^{+} π^{+}$

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1134

A search for the doubly-charmed-baryon decay $Ξ_{cc}^{++} \to Ξ_{c}^{0} π^{+} π^{+}$ is performed using proton-proton collision data collected by the LHCb experiment at a c…

hep-ex2024★ 5 cited

Amplitude analysis of $B^{+} \to ψ (2 S) K^{+} π^{+} π^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1096

The first full amplitude analysis of $B^{+} \to ψ (2 S) K^{+} π^{+} π^{-}$ decays is performed using proton-proton collision data corresponding to an integrated luminosity of $9\,\text{fb}^{…

hep-ex2024★ 13 cited

Probing the nature of the $χ_{c 1} (3872)$ state using radiative decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1097

The radiative decays $χ_{c 1} (3872) \to ψ (2 S) γ$ and $χ_{c 1} (3872) \to J / ψ γ$ are used to probe the~nature of the~ $χ_{c 1} (3872)$ state using proton-proton collision data…

hep-ex2024

Comprehensive analysis of local and nonlocal amplitudes in the $B^{0} \to K^{* 0} μ^{+} μ^{-}$ decay

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1073

A comprehensive study of the local and nonlocal amplitudes contributing to the decay $B^{0} \to K^{* 0} (\to K^{+} π^{-}) μ^{+} μ^{-}$ is performed by analysing the phase-space distributi…

hep-ex2024★ 1 cited

Measurement of the Branching Fraction of $B^{0} \to J / ψ π^{0}$ Decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1071

The ratio of branching fractions between $B^{0} \to J / ψ π^{0}$ and $B^{+} \to J / ψ K^{*+}$ decays is measured with proton-proton collision data collected by the LHCb e…

hep-ex2023★ 9 cited

Fraction of $χ_{c}$ decays in prompt $J / ψ$ production measured in pPb collisions at $s_{N N} = 8.16$ TeV

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1081

The fraction of $χ_{c 1}$ and $χ_{c 2}$ decays in the prompt $J / ψ$ yield, $F_{χc} = σ_{χ_{c} \to J / ψ} / σ_{J / ψ}$ , is measured by the LHCb detector in pPb collisions at $s_{N N} = 8.16$ …

hep-ex2023★ 5 cited

Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the $Ω_{c}^{0}$ Baryon

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1082

The first observation of the singly Cabibbo-suppressed $Ω_{c}^{0} \to Ω^{-} K^{+}$ and $Ω_{c}^{0} \to Ξ^{-} π^{+}$ decays is reported, using proton-proton collision data at a center-of-m…

hep-ex2023★ 5 cited

Observation of the decays $B_{(s)}^{0} \to D_{s 1} (2536)^{\mp} K^{\pm}$

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1088

This paper reports the observation of the decays $B_{(s)}^{0} \to D_{s 1} (2536)^{\mp} K^{\pm}$ using proton-proton collision data collected by the LHCb experiment, corresponding to an…

hep-ex2023★ 20 cited

Observation of new baryons in the $Ξ_{b}^{-} π^{+} π^{-}$ and $Ξ_{b}^{0} π^{+} π^{-}$ systems

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1052

The first observation and study of two new baryonic structures in the final state $Ξ_{b}^{0} π^{+} π^{-}$ and the confirmation of the $Ξ_{b} (6100)^{-}$ state in the $Ξ_{b}^{-} π^{+} π^{-}$ decay mode are…

hep-ex2023★ 3 cited

Observation of the $B^{+} \to J / ψ η^{'} K^{+}$ decay

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1049

The $B^{+} \to J / ψ η^{'} K^{+}$ decay is observed for the first time using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8,…

Evidence for the decay B0→μ+μ− and improved measurements of the decay Bs0​→μ+μ−

Search for GeV-scale axion-like particles in PbPb collisions

Observation of the Ξb−​→Ξ−μ+μ− and study of the Ξb−​→Ξ−ψ(2S) decays

Energy-energy correlators within Z-tagged jets in proton-proton collisions at s​ = 13 TeV

Branching fraction measurement of the B0→K+π−μ+μ− decay at high dihadron mass

First measurement of the forward rapidity dependence of W boson transverse helicity fractions

Measurement of the Ωb−​ baryon lifetime

Discovery of an unexpectedly light and narrow beauty-strange state

Observation of the doubly charmed baryon Ωcc+​

Observation of Ξb0​→Ξ0J/ψ and evidence for Ξb0​→Ξ0ψ(2S) decays

Stringent limits on CPT- and Lorentz-invariance violation from Bs0​ meson decays

First measurement of the ratio of ψ(2S)-to-J/ψ inclusive production in pAr and pp collisions at sNN​​=113GeV with SMOG2

Observation of the Ξc0​→pK− decay and measurement of its decay asymmetry

Improved measurement of η/η′ mixing in B(s)0​→J/ψη(′) decays

Observation of the doubly-charmed-baryon decay Ξcc++​→Ξc0​π+π+

Amplitude analysis of B+→ψ(2S)K+π+π− decays

Probing the nature of the χc1​(3872) state using radiative decays

Comprehensive analysis of local and nonlocal amplitudes in the B0→K∗0μ+μ− decay

Measurement of the Branching Fraction of B0→J/ψπ0 Decays

Fraction of χc​ decays in prompt J/ψ production measured in pPb collisions at sNN​​=8.16 TeV

Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the Ωc0​ Baryon

Observation of the decays B(s)0​→Ds1​(2536)∓K±

Observation of new baryons in the Ξb−​π+π− and Ξb0​π+π− systems

Observation of the B+→J/ψη′K+ decay

Evidence for the decay $B^{0} \to μ^{+} μ^{-}$ and improved measurements of the decay $B_{s}^{0} \to μ^{+} μ^{-}$

Search for $GeV$ -scale axion-like particles in PbPb collisions

Observation of the $Ξ_{b}^{-} \to Ξ^{-} μ^{+} μ^{-}$ and study of the $Ξ_{b}^{-} \to Ξ^{-} ψ (2 S)$ decays

Energy-energy correlators within $Z$ -tagged jets in proton-proton collisions at $s$ = 13 TeV

Branching fraction measurement of the $B^{0} \to K^{+} π^{-} μ^{+} μ^{-}$ decay at high dihadron mass

First measurement of the forward rapidity dependence of $W$ boson transverse helicity fractions

Measurement of the $Ω_{b}^{-}$ baryon lifetime

Observation of the doubly charmed baryon $Ω_{cc}^{+}$

Observation of $Ξ_{b}^{0} \to Ξ^{0} J / ψ$ and evidence for $Ξ_{b}^{0} \to Ξ^{0} ψ (2 S)$ decays

Stringent limits on $C P T$ - and Lorentz-invariance violation from $B_{s}^{0}$ meson decays

First measurement of the ratio of $ψ (2 S)$ -to- $J / ψ$ inclusive production in $p Ar$ and $pp$ collisions at $s_{NN} = 113 GeV$ with SMOG2

Observation of the $Ξ_{c}^{0} \to p K^{-}$ decay and measurement of its decay asymmetry

Improved measurement of $η / η^{'}$ mixing in $B_{(s)}^{0} \to J / ψ η^{(')}$ decays

Observation of the doubly-charmed-baryon decay $Ξ_{cc}^{++} \to Ξ_{c}^{0} π^{+} π^{+}$

Amplitude analysis of $B^{+} \to ψ (2 S) K^{+} π^{+} π^{-}$ decays

Probing the nature of the $χ_{c 1} (3872)$ state using radiative decays

Comprehensive analysis of local and nonlocal amplitudes in the $B^{0} \to K^{* 0} μ^{+} μ^{-}$ decay

Measurement of the Branching Fraction of $B^{0} \to J / ψ π^{0}$ Decays

Fraction of $χ_{c}$ decays in prompt $J / ψ$ production measured in pPb collisions at $s_{N N} = 8.16$ TeV

Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the $Ω_{c}^{0}$ Baryon

Observation of the decays $B_{(s)}^{0} \to D_{s 1} (2536)^{\mp} K^{\pm}$

Observation of new baryons in the $Ξ_{b}^{-} π^{+} π^{-}$ and $Ξ_{b}^{0} π^{+} π^{-}$ systems

Observation of the $B^{+} \to J / ψ η^{'} K^{+}$ decay