R. Koopman

activity

20112019

J / ψ p

resonances consistent with pentaquark states in

Λ_{b}^{0} \to J / ψ K^{-} p

decays

1.3k citations · 13.9k across the 168 of their papers we have counts for

collaborators

172 papers

hep-ex2019★ 64 cited

Search for the doubly charmed baryon $Ξ_{cc}^{+}$

LHCb collaboration, R. Aaij, C. Abelán Beteta +905

A search for the doubly charmed baryon $Ξ_{cc}^{+}$ is performed through its decay to the $Λ_{c}^{+} K^{-} π^{+}$ final state, using proton-proton collision data collected with the LHCb de…

hep-ex2018★ 9 cited

Measurement of the branching fractions of the decays $D^{+} \to K^{-} K^{+} K^{+}$ , $D^{+} \to π^{-} π^{+} K^{+}$ and $D_{s}^{+} \to π^{-} K^{+} K^{+}$

LHCb collaboration, R. Aaij, C. Abellán Beteta +841

The branching fractions of the doubly Cabibbo-suppressed decays $D^{+} \to K^{-} K^{+} K^{+}$ , $D^{+} \to π^{-} π^{+} K^{+}$ and $D_{s}^{+} \to π^{-} K^{+} K^{+}$ are measured using the decays…

hep-ex2018★ 21 cited

Measurement of the CKM angle $γ$ using $B^{\pm} \to D K^{\pm}$ with $D \to K_{S}^{0} π^{+} π^{-}$ , $K_{S}^{0} K^{+} K^{-}$ decays

LHCb collaboration, R. Aaij, B. Adeva +819

A binned Dalitz plot analysis of $B^{\pm} \to D K^{\pm}$ decays, with $D \to K_{S}^{0} π^{+} π^{-}$ and $D \to K_{S}^{0} K^{+} K^{-}$ , is used to perform a measurement of the CP-violating obse…

hep-ex2017★ 40 cited

Measurement of $B^{0}$ , $B_{s}^{0}$ , $B^{+}$ and $Λ_{b}^{0}$ production asymmetries in 7 and 8 TeV proton-proton collisions

LHCb collaboration, R. Aaij, B. Adeva +763

The $B^{0}$ , $B_{s}^{0}$ , $B^{+}$ and $Λ_{b}^{0}$ hadron production asymmetries are measured using a data sample corresponding to an integrated luminosity of 3.0 fb $^{- 1}$ , collected by the LH…

hep-ex2017★ 25 cited

Observation of the $Ξ_{b}^{-} \to J / ψ Λ K^{-}$ decay

LHCb collaboration, R. Aaij, B. Adeva +764

The observation of the decay $Ξ_{b}^{-} \to J / ψ Λ K^{-}$ is reported, using a data sample corresponding to an integrated luminosity of $3 fb^{- 1}$ , collected b…

hep-ex2016★ 66 cited

Measurement of the CKM angle $γ$ from a combination of LHCb results

LHCb collaboration, R. Aaij, B. Adeva +765

A combination of measurements sensitive to the CKM angle $γ$ from LHCb is performed. The inputs are from analyses of time-integrated $B^{+} \to D K^{+}$ , $B^{0} \rightarrow D K…

hep-ex2016★ 66 cited

Measurement of the phase difference between short- and long-distance amplitudes in the $B^{+} \to K^{+} μ^{+} μ^{-}$ decay

LHCb collaboration, R. Aaij, B. Adeva +764

A measurement of the phase difference between the short- and long-distance contributions to the $B^{+} \to K^{+} μ^{+} μ^{-}$ decay is performed by analysing the dimuon mass distribut…

hep-ex2016★ 7 cited

Measurement of the ratio of branching fractions and difference in $C P$ asymmetries of the decays $B^{+} \to J / ψ π^{+}$ and $B^{+} \to J / ψ K^{+}$

LHCb collaboration, R. Aaij, B. Adeva +764

The ratio of branching fractions and the difference in $C P$ asymmetries of the decays $B^{+} \to J / ψ π^{+}$ and $B^{+} \to J / ψ K^{+}$ are measured using a data sample of $pp$ collisions collec…

hep-ex2016

Measurements of charm mixing and $C P$ violation using $D^{0} \to K^{\pm} π^{\mp}$ decays

LHCb collaboration, R. Aaij, B. Adeva +766

Measurements of charm mixing and $C P$ violation parameters from the decay-time-dependent ratio of $D^{0} \to K^{+} π^{-}$ to $D^{0} \to K^{-} π^{+}$ decay rates and the charge-conjugate…

hep-ex2016★ 117 cited

Measurement of matter-antimatter differences in beauty baryon decays

LHCb collaboration, R. Aaij, B. Adeva +762

Differences in the behaviour of matter and antimatter have been observed in $K$ and $B$ meson decays, but not yet in any baryon decay. Such differences are associated with the non-…

hep-ex2016★ 35 cited

First experimental study of photon polarization in radiative $B_{s}^{0}$ decays

LHCb collaboration, R. Aaij, B. Adeva +765

The polarization of photons produced in radiative $B_{s}^{0}$ decays is studied for the first time. The data are recorded by the LHCb experiment in $pp$ collisions corresponding to…

hep-ex2016★ 92 cited

Search for structure in the $B_{s}^{0} π^{\pm}$ invariant mass spectrum

LHCb collaboration, R. Aaij, B. Adeva +761

The $B_{s}^{0} π^{\pm}$ invariant mass distribution is investigated in order to search for possible exotic meson states. The analysis is based on a data sample recorded with the LHCb dete…

hep-ex2016★ 31 cited

Observation of $η_{c} (2 S) \to p p ˉ$ and search for $X (3872) \to p p ˉ$ decays

LHCb collaboration, R. Aaij, B. Adeva +750

The first observation of the decay $η_{c} (2 S) \to p p ˉ$ is reported using proton-proton collision data corresponding to an integrated luminosity of $3.0 f b^{- 1}$ recorded…

hep-ex2016★ 30 cited

Study of $B_{c}^{+}$ decays to the $K^{+} K^{-} π^{+}$ final state and evidence for the decay $B_{c}^{+} \to χ_{c 0} π^{+}$

LHCb collaboration, R. Aaij, B. Adeva +761

A study of $B_{c}^{+} \to K^{+} K^{-} π^{+}$ decays is performed for the first time using data corresponding to an integrated luminosity of 3.0 $fb^{- 1}$ collected by the LHCb experime…

hep-ex2016★ 33 cited

Measurement of the properties of the $Ξ_{b}^{* 0}$ baryon

LHCb collaboration, R. Aaij, C. Abellán Beteta +731

We perform a search for near-threshold $Ξ_{b}^{0}$ resonances decaying to $Ξ_{b}^{-} π^{+}$ in a sample of proton-proton collision data corresponding to an integrated luminosity of 3 fb$^{-1…

hep-ex2016★ 136 cited

Amplitude analysis of $B^{+} \to J / ψ ϕ K^{+}$ decays

LHCb collaboration, R. Aaij, B. Adeva +751

The first full amplitude analysis of $B^{+} \to J / ψ ϕ K^{+}$ with $J / ψ \to μ^{+} μ^{-}$ , $ϕ \to K^{+} K^{-}$ decays is performed with a data sample of 3 fb $^{- 1}$ of $pp$ collision data collected at $…

hep-ex2016★ 224 cited

Observation of $J / ψ ϕ$ structures consistent with exotic states from amplitude analysis of $B^{+} \to J / ψ ϕ K^{+}$ decays

LHCb collaboration, R. Aaij, B. Adeva +751

hep-ex2016★ 154 cited

Evidence for exotic hadron contributions to $Λ_{b}^{0} \to J / ψ p π^{-}$ decays

LHCb collaboration, R. Aaij, C. Abellán Beteta +739

A full amplitude analysis of $Λ_{b}^{0} \to J / ψ p π^{-}$ decays is performed with a data sample acquired with the LHCb detector from 7 and 8 TeV $pp$ collisions, corresponding to an integ…

hep-ex2016★ 21 cited

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

R. Aaij, C. Abellán Beteta, B. Adeva +727

A proton-proton collision data sample, corresponding to an integrated luminosity of 3 fb $^{- 1}$ collected by LHCb at $s = 7$ and 8 TeV, is used to reconstruct $63 \pm 9$ $Ω_b^-\…

hep-ex2016★ 40 cited

Measurement of the $C P$ asymmetry in $B_{s}^{0} - B_{s}^{0}$ mixing

LHCb collaboration, R. Aaij, B. Adeva +735

The $C P$ asymmetry in the mixing of $B_{s}^{0}$ and $B_{s}^{0}$ mesons is measured in proton-proton collision data corresponding to an integrated luminosity of 3.0 fb $^{- 1}$ ,…

hep-ex2016★ 160 cited

Model-independent evidence for $J / ψ p$ contributions to $Λ_{b}^{0} \to J / ψ p K^{-}$ decays

LHCb collaboration, R. Aaij, C. Abellán Beteta +731

The data sample of $Λ_{b}^{0} \to J / ψ p K^{-}$ decays acquired with the LHCb detector from 7 and 8~TeV $pp$ collisions, corresponding to an integrated luminosity of 3 fb $^{- 1}$ , is inspect…

hep-ex2016★ 35 cited

A precise measurement of the $B^{0}$ meson oscillation frequency

LHCb collaboration, R. Aaij, C. Abellán Beteta +730

The oscillation frequency, $Δ m_{d}$ , of $B^{0}$ mesons is measured using semileptonic decays with a $D^{-}$ or $D^{*-}$ meson in the final state, in a data sample of $pp$ collisions coll…

hep-ex2016★ 39 cited

Measurement of $C P$ observables in $B^{\pm} \to D K^{\pm}$ and $B^{\pm} \to D π^{\pm}$ with two- and four-body $D$ decays

LHCb collaboration, R. Aaij, C. Abellán Beteta +730

Measurements of $C P$ observables in $B^{\pm} \to D K^{\pm}$ and $B^{\pm} \to D π^{\pm}$ decays are presented where the $D$ meson is reconstructed in the final states $K^\…

hep-ex2016★ 18 cited

Search for $B_{c}^{+}$ decays to the $p p ˉ π^{+}$ final state

LHCb collaboration, R. Aaij, C. Abellán Beteta +730

A search for the decays of the $B_{c}^{+}$ meson to $p p ˉ π^{+}$ is performed for the first time using a data sample corresponding to an integrated luminosity of 3.0 $fb^{- 1}$ …

Search for the doubly charmed baryon Ξcc+​

Measurement of the branching fractions of the decays D+→K−K+K+, D+→π−π+K+ and Ds+​→π−K+K+

Measurement of the CKM angle γ using B±→DK± with D→KS0​π+π−, KS0​K+K− decays

Measurement of B0, Bs0​, B+ and Λb0​ production asymmetries in 7 and 8 TeV proton-proton collisions

Observation of the Ξb−​→J/ψΛK− decay

Measurement of the CKM angle γ from a combination of LHCb results

Measurement of the phase difference between short- and long-distance amplitudes in the B+→K+μ+μ− decay

Measurement of the ratio of branching fractions and difference in CP asymmetries of the decays B+→J/ψπ+ and B+→J/ψK+

Measurements of charm mixing and CP violation using D0→K±π∓ decays

Measurement of matter-antimatter differences in beauty baryon decays

First experimental study of photon polarization in radiative Bs0​ decays

Search for structure in the Bs0​π± invariant mass spectrum

Observation of ηc​(2S)→ppˉ​ and search for X(3872)→ppˉ​ decays

Study of Bc+​ decays to the K+K−π+ final state and evidence for the decay Bc+​→χc0​π+

Measurement of the properties of the Ξb∗0​ baryon

Amplitude analysis of B+→J/ψϕK+ decays

Observation of J/ψϕ structures consistent with exotic states from amplitude analysis of B+→J/ψϕK+ decays

Evidence for exotic hadron contributions to Λb0​→J/ψpπ− decays

Measurement of the mass and lifetime of the Ωb−​ baryon

Measurement of the CP asymmetry in Bs0​−Bs0​ mixing

Model-independent evidence for J/ψp contributions to Λb0​→J/ψpK− decays

A precise measurement of the B0 meson oscillation frequency

Measurement of CP observables in B±→DK± and B±→Dπ± with two- and four-body D decays

Search for Bc+​ decays to the ppˉ​π+ final state

Search for the doubly charmed baryon $Ξ_{cc}^{+}$

Measurement of the branching fractions of the decays $D^{+} \to K^{-} K^{+} K^{+}$ , $D^{+} \to π^{-} π^{+} K^{+}$ and $D_{s}^{+} \to π^{-} K^{+} K^{+}$

Measurement of the CKM angle $γ$ using $B^{\pm} \to D K^{\pm}$ with $D \to K_{S}^{0} π^{+} π^{-}$ , $K_{S}^{0} K^{+} K^{-}$ decays

Measurement of $B^{0}$ , $B_{s}^{0}$ , $B^{+}$ and $Λ_{b}^{0}$ production asymmetries in 7 and 8 TeV proton-proton collisions

Observation of the $Ξ_{b}^{-} \to J / ψ Λ K^{-}$ decay

Measurement of the CKM angle $γ$ from a combination of LHCb results

Measurement of the phase difference between short- and long-distance amplitudes in the $B^{+} \to K^{+} μ^{+} μ^{-}$ decay

Measurement of the ratio of branching fractions and difference in $C P$ asymmetries of the decays $B^{+} \to J / ψ π^{+}$ and $B^{+} \to J / ψ K^{+}$

Measurements of charm mixing and $C P$ violation using $D^{0} \to K^{\pm} π^{\mp}$ decays

First experimental study of photon polarization in radiative $B_{s}^{0}$ decays

Search for structure in the $B_{s}^{0} π^{\pm}$ invariant mass spectrum

Observation of $η_{c} (2 S) \to p p ˉ$ and search for $X (3872) \to p p ˉ$ decays

Study of $B_{c}^{+}$ decays to the $K^{+} K^{-} π^{+}$ final state and evidence for the decay $B_{c}^{+} \to χ_{c 0} π^{+}$

Measurement of the properties of the $Ξ_{b}^{* 0}$ baryon

Amplitude analysis of $B^{+} \to J / ψ ϕ K^{+}$ decays

Observation of $J / ψ ϕ$ structures consistent with exotic states from amplitude analysis of $B^{+} \to J / ψ ϕ K^{+}$ decays

Evidence for exotic hadron contributions to $Λ_{b}^{0} \to J / ψ p π^{-}$ decays

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

Measurement of the $C P$ asymmetry in $B_{s}^{0} - B_{s}^{0}$ mixing

Model-independent evidence for $J / ψ p$ contributions to $Λ_{b}^{0} \to J / ψ p K^{-}$ decays

A precise measurement of the $B^{0}$ meson oscillation frequency

Measurement of $C P$ observables in $B^{\pm} \to D K^{\pm}$ and $B^{\pm} \to D π^{\pm}$ with two- and four-body $D$ decays

Search for $B_{c}^{+}$ decays to the $p p ˉ π^{+}$ final state