R. Caspary

activity

20102026

most citedTest of lepton universality in

b \to s ℓ^{+} ℓ^{-}

decays

126 citations · 1.6k across the 167 of their papers we have counts for

collaborators

Showing hep-exShow all

165 papers · 1 filter

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

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-ex2026

Angular analysis of the decay $Λ_{b}^{0} \to Λ (1520) μ^{+} μ^{-}$

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

The first angular analysis of $Λ_{b}^{0} \to Λ (1520) μ^{+} μ^{-}$ decays is presented, using proton-proton collision data collected with the LHCb detector betwe…

hep-ex2026

Model-independent measurement of the transversity amplitudes of the $B^{0} \to K^{* 0} μ^{+} μ^{-}$ decay

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

An analysis of the decay amplitudes of $B^{0} \to K^{* 0} (\to K^{+} π^{-}) μ^{+} μ^{-}$ is presented, using proton-proton collision data recorded by the LHCb experiment at centre-of-mass energie…

hep-ex2026

New measurements of $B_{c}^{+}$ decays into single charm final states

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1132

Using proton-proton collision data corresponding to an integrated luminosity of $9 fb^{- 1}$ collected by the LHCb experiment, searches are performed for $B_{c}^{+}$ mesons d…

hep-ex2025

Study of charm mixing and CP violation with $D^{0} \to K^{\pm} π^{\mp} π^{\pm} π^{\mp}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1188

A study of charm mixing and CP violation in $D^{0} \to K^{\pm} π^{\mp} π^{\pm} π^{\mp}$ decays is performed using data collected by the LHCb experiment in proton-proton collisions from 2015 to 2…

hep-ex2025

Measurement of the $W \to μ ν_{μ}$ cross-sections as a function of the muon transverse momentum in $pp$ collisions at 5.02 TeV

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1186

The $pp \to W^{\pm} (\to μ^{\pm} ν_{μ}) X$ cross-sections are measured at a proton-proton centre-of-mass energy $s = 5.02$ TeV using a dataset corresponding to an integrated l…

hep-ex2025★ 2 cited

First evidence of $C P$ violation in beauty baryon to charmonium decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1178

A study of the difference in the $C P$ asymmetries between $Λ_{b}^{0} \to J / ψ p π^{-}$ and $Λ_{b}^{0} \to J / ψ p K^{-}$ decays, $Δ A_{C P}$ , is performed using proton-prot…

hep-ex2025★ 2 cited

Observation of $B_{c}^{+} \to D h^{+} h^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1185

Searches are presented for $B_{c}^{+} \to D h^{+} h^{-}$ decays, where $D$ is a charmed meson and $h^{\pm}$ is a charged pion or kaon, using $pp$ collision data collected by the LHCb e…

hep-ex2025

Amplitude analysis of $B^{0} \to η_{c} (1 S) K^{+} π^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1185

An amplitude analysis of the $B^{0} \to η_{c} (1 S) K^{+} π^{-}$ decays with $η_{c} (1 S) \to p p ˉ$ is performed using a sample corresponding to an integrated luminosity of 9$\…

hep-ex2025

Inclusive $B$ -meson flavour-tagging algorithm at LHCb

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1179

A new algorithm is developed to identify the flavour of neutral $B$ mesons at production in $pp$ collisions by utilising all tracks from the hadronisation process. The algorithm is…

hep-ex2025

Deuteron identification via time of flight with LHCb

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1183

It is shown that the timing capabilities of the LHCb detector operated during the LHC Run 2 can be used to identify light ion particles with momenta of a few GeV/ $c$ . This is achie…

hep-ex2025★ 1 cited

Amplitude analysis of the $Ξ_{c}^{+} \to p K^{-} π^{+}$ decay and $Ξ_{c}^{+}$ baryon polarization measurement in semileptonic beauty-hadron decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1128

An amplitude analysis of the $Ξ_{c}^{+} \to p K^{-} π^{+}$ decay together with a measurement of the $Ξ_{c}^{+}$ polarization vector in semileptonic beauty-hadron decays is presented. The analysis…

hep-ex2025

Search for resonances decaying to photon pairs with masses between 4.9 and 19.4 GeV

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1144

A search is presented for axion-like particles (ALPs) with masses between 4.9 and 19.4 GeV decaying to a pair of photons, using proton-proton collisions collected with the LHCb det…

hep-ex2025★ 1 cited

Search for the decay $B^{0} \to ϕϕ$

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1160

A search for the decay $B^{0} \to ϕϕ$ is made using $pp$ collision data collected with the LHCb detector at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an in…

hep-ex2025

Precision measurement of the $Ξ_{b}^{0}$ baryon lifetime

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1176

A sample of $pp$ collision data, corresponding to an integrated luminosity of 5.4 fb $^{- 1}$ and collected by the LHCb experiment during LHC Run 2, is used to measure the ratio of t…

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

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

Angular analysis of the decay Λb0​→Λ(1520)μ+μ−

Model-independent measurement of the transversity amplitudes of the B0→K∗0μ+μ− decay

New measurements of Bc+​ decays into single charm final states

Study of charm mixing and CP violation with D0→K±π∓π±π∓ decays

Measurement of the W→μνμ​ cross-sections as a function of the muon transverse momentum in pp collisions at 5.02 TeV

First evidence of CP violation in beauty baryon to charmonium decays

Observation of Bc+​→Dh+h− decays

Amplitude analysis of B0→ηc​(1S)K+π− decays

Inclusive B-meson flavour-tagging algorithm at LHCb

Deuteron identification via time of flight with LHCb

Amplitude analysis of the Ξc+​→pK−π+ decay and Ξc+​ baryon polarization measurement in semileptonic beauty-hadron decays

Search for resonances decaying to photon pairs with masses between 4.9 and 19.4 GeV

Search for the decay B0→ϕϕ

Precision measurement of the Ξb0​ baryon lifetime

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

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

Angular analysis of the decay $Λ_{b}^{0} \to Λ (1520) μ^{+} μ^{-}$

Model-independent measurement of the transversity amplitudes of the $B^{0} \to K^{* 0} μ^{+} μ^{-}$ decay

New measurements of $B_{c}^{+}$ decays into single charm final states

Study of charm mixing and CP violation with $D^{0} \to K^{\pm} π^{\mp} π^{\pm} π^{\mp}$ decays

Measurement of the $W \to μ ν_{μ}$ cross-sections as a function of the muon transverse momentum in $pp$ collisions at 5.02 TeV

First evidence of $C P$ violation in beauty baryon to charmonium decays

Observation of $B_{c}^{+} \to D h^{+} h^{-}$ decays

Amplitude analysis of $B^{0} \to η_{c} (1 S) K^{+} π^{-}$ decays

Inclusive $B$ -meson flavour-tagging algorithm at LHCb

Amplitude analysis of the $Ξ_{c}^{+} \to p K^{-} π^{+}$ decay and $Ξ_{c}^{+}$ baryon polarization measurement in semileptonic beauty-hadron decays

Search for the decay $B^{0} \to ϕϕ$

Precision measurement of the $Ξ_{b}^{0}$ baryon lifetime