Simon Nieswand

activity

20202023

J / ψ Λ

resonance consistent with a strange pentaquark candidate in

B^{-} \to J / ψ Λ p ˉ

decays

154 citations · 799 across the 23 of their papers we have counts for

collaborators

23 papers

hep-ex2023★ 78 cited

The LHCb upgrade I

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1305

The LHCb upgrade represents a major change of the experiment. The detectors have been almost completely renewed to allow running at an instantaneous luminosity five times larger th…

hep-ex2023★ 4 cited

Search for $CP$ violation in $D_{(s)}^{+} \to K^{-} K^{+} K^{+}$ decays

LHCb collaboration

A search for direct $CP$ violation in the Cabibbo-suppressed decay $D_{s}^{+} \to K^{-} K^{+} K^{+}$ and in the doubly Cabibbo-suppressed decay $D^{+}\rightarrow K^{-}K^{…

hep-ex2022★ 3 cited

First observation and branching fraction measurement of the $Λ_{b}^{0} \to D_{s}^{-} p$ decay

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1048

The first observation of the $Λ_{b}^{0} \to D_{s}^{-} p$ decay is presented using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of ${\sqrt{s}=13 \…

hep-ex2022★ 12 cited

Search for rare decays of $D^{0}$ mesons into two muons

LHCb collaboration

A search for the very rare $D^{0} \to μ^{+} μ^{-}$ decay is performed using data collected by the LHCb experiment in proton-proton collisions at $s = 7$ , 8 and $13 TeV$ , corre…

hep-ex2022★ 112 cited

Measurement of lepton universality parameters in $B^{+} \to K^{+} ℓ^{+} ℓ^{-}$ and $B^{0} \to K^{* 0} ℓ^{+} ℓ^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1047

A simultaneous analysis of the $B^{+} \to K^{+} ℓ^{+} ℓ^{-}$ and $B^{0} \to K^{* 0} ℓ^{+} ℓ^{-}$ decays is performed to test muon-electron universality in two ranges of the square of the di…

hep-ex2022★ 126 cited

Test of lepton universality in $b \to s ℓ^{+} ℓ^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1047

The first simultaneous test of muon-electron universality using $B^{+} \to K^{+} ℓ^{+} ℓ^{-}$ and $B^{0} \to K^{* 0} ℓ^{+} ℓ^{-}$ decays is performed, in two r…

hep-ex2022★ 53 cited

Amplitude analysis of $B^{0} \to D^{0} D_{s}^{+} π^{-}$ and $B^{+} \to D^{-} D_{s}^{+} π^{+}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1055

Resonant contributions in $B^{0} \to D^{0} D_{s}^{+} π^{-}$ and $B^{+} \to D^{-} D_{s}^{+} π^{+}$ decays are determined with an amplitude analysis, which is performed both sepa…

hep-ex2022★ 80 cited

First observation of a doubly charged tetraquark and its neutral partner

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1055

A combined amplitude analysis is performed for the decays $B^{0} \to D^{0} D_{s}^{+} π^{-}$ and $B^{+} \to D^{-} D_{s}^{+} π^{+}$ , which are related by isospin symmetry. The an…

hep-ex2022★ 4 cited

Measurement of the ratio of branching fractions $B (B_{c}^{+} \to B_{s}^{0} π^{+}) / B (B_{c}^{+} \to J / ψ π^{+})$

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1054

The ratio of branching fractions of $B_{c}^{+} \to B_{s}^{0} π^{+}$ and $B_{c}^{+} \to J / ψ π^{+}$ decays is measured with proton-proton collision data of a centre-of-mass energy of $13 TeV$ .…

hep-ex2022★ 154 cited

Observation of a $J / ψ Λ$ resonance consistent with a strange pentaquark candidate in $B^{-} \to J / ψ Λ p ˉ$ decays

LHCb collaboration

An amplitude analysis of $B^{-} \to J / ψ Λ p ˉ$ decays is performed using about 4400 signal candidates selected on a data sample of $pp$ collisions recorded at center-of-mass energie…

hep-ex2022★ 14 cited

Search for the lepton-flavour violating decays $B^{0} \to K^{* 0} τ^{\pm} μ^{\mp}$

LHCb collaboration

A first search for the lepton-flavour violating decays $B^{0} \to K^{* 0} τ^{\pm} μ^{\mp}$ is presented. The analysis is performed using a sample of proton-proton collision data, collecte…

hep-ex2022★ 4 cited

Amplitude analysis of the $D_{s}^{+} \to π^{-} π^{+} π^{+}$ decay

LHCb collaboration

A Dalitz plot analysis of the $D_{s}^{+} \to π^{-} π^{+} π^{+}$ decay is presented. The analysis is based on proton-proton collision data recorded by the LHCb experiment at a centre-of-mass…

hep-ex2022★ 3 cited

Amplitude analysis of the $D^{+} \to π^{-} π^{+} π^{+}$ decay and measurement of the $π^{-} π^{+}$ S-wave amplitude

LHCb Collaboration

An amplitude analysis of the $D^{+} \to π^{-} π^{+} π^{+}$ decay is performed with a sample corresponding to $1.5 f b^{- 1}$ of integrated luminosity of $pp$ collisions at a centre-of-mas…

hep-ex2022★ 36 cited

Study of exclusive photoproduction of charmonium in ultra-peripheral lead-lead collisions

LHCb collaboration

The cross-sections of exclusive (coherent) photoproduction $J / ψ$ and $ψ (2S)$ mesons in ultra-peripheral PbPb collisions at a nucleon-nucleon centre-of-mass energy of $5.02…

hep-ex2022★ 27 cited

Direct $C P$ violation in charmless three-body decays of $B^{\pm}$ mesons

LHCb Collaboration

Measurements of $C P$ asymmetries in charmless three-body decays of $B^{\pm}$ mesons are reported using proton-proton collision data collected by the LHCb detector, corresponding to a…

hep-ex2022★ 7 cited

Search for direct $C P$ violation in charged charmless $B \to P V$ decays

LHCb Collaboration

Measurements of $C P$ asymmetry in charmless $B \to P V$ decays are presented, where $P$ and $V$ denote a pseudoscalar and a vector meson, respectively. Five different $B \to P V$ decay…

hep-ex2021★ 32 cited

Observation of two new excited $Ξ_{b}^{0}$ states decaying to $Λ_{b}^{0} K^{-} π^{+}$

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +995

Two narrow resonant states are observed in the $Λ_{b}^{0} K^{-} π^{+}$ mass spectrum using a data sample of proton-proton collisions at a center-of-mass energy of 13 $TeV$ , collect…

hep-ex2021★ 4 cited

Angular analysis of the rare decay $B_{s}^{0} \to ϕ μ^{+} μ^{-}$

LHCb Collaboration, R. Aaij, A. S. W. Abdelmotteleb +992

An angular analysis of the rare decay $B_{s}^{0} \to ϕ μ^{+} μ^{-}$ is presented, using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of $7$ ,…

hep-ex2021★ 1 cited

First measurement of the $C P$ -violating phase in $B_{s}^{0} \to J / ψ (\to e^{+} e^{-}) ϕ$ decays

LHCb collaboration, R. Aaij, C. Abellán Beteta +954

A flavour-tagged time-dependent angular analysis of $B_{s}^{0} \to J / ψ ϕ$ decays is presented where the $J / ψ$ meson is reconstructed through its decay to an $e^{+} e^{-}$ pair. The analysis u…

hep-ex2021★ 19 cited

Search for $C P$ violation in $Ξ_{b}^{-} \to p K^{-} K^{-}$ decays

LHCb collaboration, R. Aaij, C. Abellán Beteta +956

A search for $C P$ violation in charmless three-body $Ξ_{b}^{-} \to p K^{-} K^{-}$ decays is performed using $pp$ collision data recorded with the LHCb detector, corresponding to integrated…

hep-ex2020

Search for the rare decay $B^{0} \to J / ψ ϕ$

LHCb collaboration, R. Aaij, C. Abellán Beteta +962

A search for the rare decay $B^{0} \to J / ψ ϕ$ is performed using $pp$ collision data collected with the LHCb detector at centre-of-mass energies of 7, 8 and 13 TeV, correspond…

hep-ex2020★ 26 cited

Study of $B_{s}^{0} \to J / ψ π^{+} π^{-} K^{+} K^{-}$ decays

LHCb collaboration, R. Aaij, C. Abellán Beteta +958

The decays $B_{s}^{0} \to J / ψ π^{+} π^{-} K^{+} K^{-}$ are studied using a data set corresponding to an integrated luminosity of 9fb $^{- 1}$ , collected with the LHCb detector in proton-pr…

hep-ex2020

Searches for 25 rare and forbidden decays of $D^{+}$ and $D_{s}^{+}$ mesons

LHCb collaboration, R. Aaij, C. Abellán Beteta +998

A search is performed for rare and forbidden charm decays of the form $D_{(s)}^{+} \to h^{\pm} ℓ^{+} ℓ^{(') \mp}$ , where $h^{\pm}$ is a pion or kaon and $ℓ^{(^{'}) \pm}$ is an ele…

The LHCb upgrade I

Search for CP violation in D(s)+​→K−K+K+ decays

First observation and branching fraction measurement of the Λb0​→Ds−​p decay

Search for rare decays of D0 mesons into two muons

Measurement of lepton universality parameters in B+→K+ℓ+ℓ− and B0→K∗0ℓ+ℓ− decays

Test of lepton universality in b→sℓ+ℓ− decays

Amplitude analysis of B0→D0Ds+​π− and B+→D−Ds+​π+ decays

First observation of a doubly charged tetraquark and its neutral partner

Measurement of the ratio of branching fractions B(Bc+​→Bs0​π+)/B(Bc+​→J/ψπ+)

Observation of a J/ψΛ resonance consistent with a strange pentaquark candidate in B−→J/ψΛpˉ​ decays

Search for the lepton-flavour violating decays B0→K∗0τ±μ∓

Amplitude analysis of the Ds+​→π−π+π+ decay

Amplitude analysis of the D+→π−π+π+ decay and measurement of the π−π+ S-wave amplitude

Study of exclusive photoproduction of charmonium in ultra-peripheral lead-lead collisions

Direct CP violation in charmless three-body decays of B± mesons

Search for direct CP violation in charged charmless B→PV decays

Observation of two new excited Ξb0​ states decaying to Λb0​K−π+

Angular analysis of the rare decay Bs0​→ϕμ+μ−

First measurement of the CP-violating phase in Bs0​→J/ψ(→e+e−)ϕ decays

Search for CP violation in Ξb−​→pK−K− decays

Search for the rare decay B0→J/ψϕ

Study of Bs0​→J/ψπ+π−K+K− decays

Searches for 25 rare and forbidden decays of D+ and Ds+​ mesons

Search for $CP$ violation in $D_{(s)}^{+} \to K^{-} K^{+} K^{+}$ decays

First observation and branching fraction measurement of the $Λ_{b}^{0} \to D_{s}^{-} p$ decay

Search for rare decays of $D^{0}$ mesons into two muons

Measurement of lepton universality parameters in $B^{+} \to K^{+} ℓ^{+} ℓ^{-}$ and $B^{0} \to K^{* 0} ℓ^{+} ℓ^{-}$ decays

Test of lepton universality in $b \to s ℓ^{+} ℓ^{-}$ decays

Amplitude analysis of $B^{0} \to D^{0} D_{s}^{+} π^{-}$ and $B^{+} \to D^{-} D_{s}^{+} π^{+}$ decays

Measurement of the ratio of branching fractions $B (B_{c}^{+} \to B_{s}^{0} π^{+}) / B (B_{c}^{+} \to J / ψ π^{+})$

Observation of a $J / ψ Λ$ resonance consistent with a strange pentaquark candidate in $B^{-} \to J / ψ Λ p ˉ$ decays

Search for the lepton-flavour violating decays $B^{0} \to K^{* 0} τ^{\pm} μ^{\mp}$

Amplitude analysis of the $D_{s}^{+} \to π^{-} π^{+} π^{+}$ decay

Amplitude analysis of the $D^{+} \to π^{-} π^{+} π^{+}$ decay and measurement of the $π^{-} π^{+}$ S-wave amplitude

Direct $C P$ violation in charmless three-body decays of $B^{\pm}$ mesons

Search for direct $C P$ violation in charged charmless $B \to P V$ decays

Observation of two new excited $Ξ_{b}^{0}$ states decaying to $Λ_{b}^{0} K^{-} π^{+}$

Angular analysis of the rare decay $B_{s}^{0} \to ϕ μ^{+} μ^{-}$

First measurement of the $C P$ -violating phase in $B_{s}^{0} \to J / ψ (\to e^{+} e^{-}) ϕ$ decays

Search for $C P$ violation in $Ξ_{b}^{-} \to p K^{-} K^{-}$ decays

Search for the rare decay $B^{0} \to J / ψ ϕ$

Study of $B_{s}^{0} \to J / ψ π^{+} π^{-} K^{+} K^{-}$ decays

Searches for 25 rare and forbidden decays of $D^{+}$ and $D_{s}^{+}$ mesons