S. Ek-In

Constraints on the $K_{S}^{0} \to I^¼^{+} I^¼^{-}$ branching fraction

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +901

A search for the decay $K_{S}^{0} \to I^¼^{+} I^¼^{-}$ is performed using proton-proton collision data, corresponding to an integrated luminosity of $5.6 fb^{- 1}$ …

Test of lepton universality with $I^_{b}^{0} \to p K^{-} ℓ^{+} ℓ^{-}$ decays

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +904

The ratio of branching fractions of the decays $I^_{b}^{0} \to p K^{-} e^{+} e^{-}$ and $I^_{b}^{0} \to p K^{-} I^¼^{+} I^¼^{-}$ , $R_{p K}^{- 1}$ , is measured for the first time using proton-p…

Observation of excited $I^c ◯_{c}^{0}$ baryons in $I^c ◯_{b}^{-} \to I^_{c}^{+} K^{-} I ¨ ^{-}$ decays

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +959

The first observation of the $I^c ◯_{b}^{-} \to I^_{c}^{+} K^{-} I ¨ ^{-}$ decay is reported using $pp$ collision data at centre-of-mass energies of 7, 8 and 13\, $TeV$ collected by the LHC…

hep-ex2025

Measurements of the branching fraction ratio $B (I ¨ \to I^¼^{+} I^¼^{-}) / B (I ¨ \to e^{+} e^{-})$ with charm meson decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1083

Measurements of the branching fraction ratio $B (I ¨ \to I^¼^{+} I^¼^{-}) / B (I ¨ \to e^{+} e^{-})$ with $D_{s}^{+} \to I ¨ ^{+} I ¨ $ and $D^{+} \to I ¨ ^{+} I ¨ $ decays, denoted $R^{s}_…

Search for $A^{'} \to I^¼^{+} I^¼^{-}$ decays

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +905

Searches are performed for both prompt-like and long-lived dark photons, $A^{'}$ , produced in proton-proton collisions at a center-of-mass energy of 13 TeV. These searches look for $A…

Model-independent study of structure in $B^{+} \to D^{+} D^{-} K^{+}$ decays

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +963

The only anticipated resonant contributions to $B^{+} \to D^{+} D^{-} K^{+}$ decays are charmonium states in the $D^{+} D^{-}$ channel. A model-independent analysis, using LHCb proton-proton colli…

Search for the lepton flavour violating decay $B^{+} \to K^{+} I^¼^{-} I ¨ ^{+}$ using $B_{s 2}^{* 0}$ decays

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +904

A search is presented for the lepton flavour violating decay $B^{+} \to K^{+} I^¼^{-} I ¨ ^{+}$ using a sample of proton--proton collisions at centre-of-mass energies of 7, 8, and 13…

Observation of structure in the $J / I ¨ $ -pair mass spectrum

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +964

Using proton-proton collision data at centre-of-mass energies of $s = 7$ , $8$ and $13 TeV$ recorded by the LHCb experiment at the Large Hadron Collider, correspond…

Angular analysis of $D^{0} \to I ¨ ^{+} I ¨ ^{-} I^¼^{+} I^¼^{-}$ and $D^{0} \to K^{+} K^{-} I^¼^{+} I^¼^{-}$ decays and search for $C P$ violation

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1003

The first full angular analysis and an updated measurement of the decay-rate $C P$ asymmetry of the $D^{0} \to I ¨ ^{+} I ¨ ^{-} I^¼^{+} I^¼^{-}$ and $D^{0} \to K^{+} K^{-} I^¼^{+} I^¼^{-}$ decays are reported. The…

Measurement of differential $b b ˉ$ - and $c c ˉ$ -dijet cross-sections in the forward region of $pp$ collisions at $s = 13 TeV$

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +975

The inclusive $b b ˉ$ - and $c c ˉ$ -dijet production cross-sections in the forward region of $pp$ collisions are measured using a data sample collected with the LHCb detecto…

Measurement of $C P$ -averaged observables in the $B^{0} \to K^{* 0} I^¼^{+} I^¼^{-}$ decay

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +902

An angular analysis of the $B^{0} \to K^{* 0} (\to K^{+} I ¨ ^{-}) I^¼^{+} I^¼^{-}$ decay is presented using a data set corresponding to an integrated luminosity of 4.7 fb $^{- 1}$ of…

Amplitude analysis and branching fraction measurement of $B^{+} \to D^{*-} D_{s}^{+} I ¨ ^{+}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1060

The decays of the $B^{+}$ meson to the final state $D^{*-} D_{s}^{+} I ¨ ^{+}$ are studied in proton-proton collision data collected with the LHCb detector at centre-of-mass energies o…

Observation of a new baryon state in the $I^_{b}^{0} I ¨ ^{+} I ¨ ^{-}$ mass spectrum

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +905

A new baryon state is observed in the $I^_{b}^{0} I ¨ ^{+} I ¨ ^{-}$ mass spectrum with high significance using a data sample of $pp$ collisions, collected with the LHCb detector at centre-of-ma…

Observation of several sources of $C P$ violation in $B^{+} \to I ¨ ^{+} I ¨ ^{+} I ¨ ^{-}$ decays

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +868

Observations are reported of different sources of $C P$ violation from an amplitude analysis of $B^{+} \to I ¨ ^{+} I ¨ ^{+} I ¨ ^{-}$ decays, based on a data sample corresponding to an integrate…

Study of the $I ¨ _{2} (3823)$ and $I ¨ _{c 1} (3872)$ states in $B^{+} \to (J I ¨ I ¨ ^{+} I ¨ ^{-}) K^{+}$ decays

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +956

The decays $B^{+} \to J / I ¨ I ¨ ^{+} I ¨ ^{-} K^{+}$ are studied using a data set corresponding to an integrated luminosity of 9fb $^{- 1}$ collected with the LHCb detector in proton-proton…

Study of $Z$ bosons produced in association with charm in the forward region

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +994

Events containing a $Z$ boson and a charm jet are studied for the first time in the forward region of proton-proton collisions. The data sample used corresponds to an integrated lu…

Searches for rare $B_{s}^{0}$ and $B^{0}$ decays into four muons

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +997

Searches for rare $B_{s}^{0}$ and $B^{0}$ decays into four muons are performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosi…

A search for rare $B \to D I^¼^{+} I^¼^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1046

A search for rare $B \to D I^¼^{+} I^¼^{-}$ decays is performed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of…

Search for the doubly heavy $I^_{b c}^{0}$ baryon via decays to $D^{0} p K^{-}$

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +987

A search for the doubly heavy $I^_{b c}^{0}$ baryon using its decay to the $D^{0} p K^{-}$ final state is performed using proton-proton collision data at a centre-of-mass energy of…

Observation of the decay $I^_{b}^{0} \to I ¨ _{c 1} p I ¨ ^{-}$

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +945

The Cabibbo-suppressed decay $I^_{b}^{0} \to I ¨ _{c 1} p I ¨ ^{-}$ is observed for the first time using data from proton-proton collisions corresponding to an integrated luminosity of 6f…

Observation of a new excited $D_{s}^{+}$ meson in $B^{0} \to D^{-} D^{+} K^{+} I ¨ ^{-}$ decays

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +961

Using $pp$ collision data corresponding to an integrated luminosity of $5.4 fb^{- 1}$ collected with the LHCb detector at a center-of-mass energy of $13 TeV$ , the $B^0…

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 $B^{0} \to D^{0} D_{s}^{+} I ¨ ^{-}$ and $B^{+} \to D^{-} D_{s}^{+} I ¨ ^{+}$ , which are related by isospin symmetry. The…

Analysis of neutral $B$ -meson decays into two muons

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +953

Branching fraction and effective lifetime measurements of the rare decay $B_{s}^{0} \to I^¼^{+} I^¼^{-}$ and searches for the decays $B^{0} \to I^¼^{+} I^¼^{-}$ and $B_{s}^{0} \to I^¼^{+} I^¼^{-} I^^{3}$ are reported using…

Precise determination of the B0s-B0sbar oscillation frequency

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +946

Mesons comprising a beauty quark and a strange quark can oscillate between particle (B0s) and antiparticle (B0s) flavour eigenstates, with a frequency given by the mass difference…

Determination of quantum numbers for several excited charmed mesons observed in $B^{-} \to D^{*+} I ¨ ^{-} I ¨ ^{-}$ decays

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +907

A four-body amplitude analysis of the $B^{-} \to D^{*+} I ¨ ^{-} I ¨ ^{-}$ decay is performed, where fractions and relative phases of the various resonances contributing to the decay are mea…

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…

Multiplicity dependence of $I ¨ _{I ¨ (2 S)} / I ¨ _{J / I ¨ }$ in $pp$ collisions at $s = 13$ TeV

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1087

The ratio of production cross-sections of $I ¨ (2 S)$ over $J / I ¨ $ mesons as a function of charged-particle multiplicity in proton-proton collisions at a centre-of-mass energy $\sqrt{s…

Observation of the $B_{s}^{0} \to I ¨ _{c 1} (3872) I ¨ ^{+} I ¨ ^{-}$ decay

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1045

The first observation of the $B_{s}^{0} \to (I ¨ _{c 1} (3872) \to J / I ¨ I ¨ ^{+} I ¨ ^{-}) I ¨ ^{+} I ¨ ^{-}$ decay is reported using proton-proton collision data, corresponding…

Observation of $I^_{b}^{0} \to I^_{c}^{+} D_{s}^{-}$ and $I^_{b}^{-} \to I^_{c}^{0} D_{s}^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1090

The $I^_{b}^{0} \to I^_{c}^{+} D_{s}^{-}$ and $I^_{b}^{-} \to I^_{c}^{0} D_{s}^{-}$ decays are observed for the first time using proton-proton collision data collected by the LHCb experime…

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

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +958

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

Measurement of $I^_{cc}^{++}$ production in $pp$ collisions at $s = 13$ TeV

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +900

The production of $I^_{cc}^{++}$ baryons in proton-proton collisions at a centre-of-mass energy of $s = 13$ TeV is measured in the transverse-momentum range $4<p_\mathr…

First branching fraction measurement of the suppressed decay $I^_{c}^{0} \to I ¨ ^{-} I^_{c}^{+}$

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +963

The $I^_{c}^{0}$ baryon is unstable and usually decays into charmless final states by the $c \to s u d$ transition. It can, however, also disintegrate into a $I ¨ ^{-}$ meson and…

Observation of the $I^_{b}^{0} \to I ¨ _{c 1} (3872) p K^{-}$ decay

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +903

Using proton-proton collision data, collected with the LHCb detector and corresponding to 1.0, 2.0 and 1.9fb $^{- 1}$ of integrated luminosity at the centre-of-mass energies of 7, 8,…

Enhanced production of $I^_{b}^{0}$ baryons in high-multiplicity $pp$ collisions at $s = 13$ TeV

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1085

The production rate of $I^_{b}^{0}$ baryons relative to $B^{0}$ mesons in $pp$ collisions at a center-of-mass energy $s = 13$ TeV is measured by the LHCb experiment. The rat…

First measurement of the $Z \to I^¼^{+} I^¼^{-}$ angular coefficients in the forward region of $pp$ collisions at $s = 13$ TeV

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +999

The first study of the angular distribution of $I^¼^{+} I^¼^{-}$ pairs produced in the forward rapidity region via the Drell-Yan reaction $pp \rightarrow Î³^{*}/Z +X \rightarrow l^+ l^-…

Momentum scale calibration of the LHCb spectrometer

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1076

For accurate determination of particle masses accurate knowledge of the momentum scale of the detectors is crucial. The procedure used to calibrate the momentum scale of the LHCb s…

Measurement of the photon polarization in $I^_{b} \to I^ I^^{3}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +994

The photon polarization in $b \to s I^^{3}$ transitions is measured for the first time in radiative b-baryon decays exploiting the unique spin structure of $I^_{b} \to I^ I^^{3}$ decays. A da…

Search for the decay $B^{0} \to I ¨ I^¼^{+} I^¼^{-}$

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +988

A search for the decay $B^{0} \to I ¨ I^¼^{+} I^¼^{-}$ is performed using proton-proton collisions at centre-of-mass energies of 7, 8, and 13 TeV collected by the LHCb experiment and correspond…

Measurement of CP violation in the decay $B^{+} \to K^{+} I ¨ ^{0}$

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +960

A measurement of direct CP violation in the decay $B^{+} \to K^{+} I ¨ ^{0}$ is reported using a data sample corresponding to an integrated luminosity of 5.4 $\textrm{fb}^{-1…

Observation of $I^_{b}^{0} \to I^_{c}^{+} D ˉ^{() 0} K^{-}$ and $I^_{b}^{0} \to I^_{c}^{+} D_{s}^{-}$ decays

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

The decays $I^_{b}^{0} \to I^_{c}^{+} D ˉ^{(*) 0} K^{-}$ and $I^_{b}^{0} \to I^_{c}^{+} D_{s}^{*-}$ are observed for the first time, in proton-proton collision data at $s = 13$ TeV corresponding…

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

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +999

An amplitude analysis of $I^_{c}^{+} \to p K^{-} I ¨ ^{+}$ decays together with a measurement of the $I^_{c}^{+}$ polarization vector in semileptonic beauty hadron decays is presented. A sample of…

Precision measurement of forward $Z$ boson production in proton-proton collisions at $s = 13$ TeV

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +998

A precision measurement of the $Z$ boson production cross-section at $s = 13$ TeV in the forward region is presented, using $pp$ collision data collected by the LHCb detecto…

Search for $C P$ violation in $I^_{c}^{+} \to p K^{-} I ¨ ^{+}$ decays using model-independent techniques

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +950

A first search for $C P$ violation in the Cabibbo-suppressed $I^_{c}^{+} \to p K^{-} I ¨ ^{+}$ decay is performed using both a binned and an unbinned model-independent technique in the D…

Measurement of the electron reconstruction efficiency at LHCb

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +910

The single electron track-reconstruction efficiency is calibrated using a sample corresponding to $1.3 fb^{- 1}$ of $pp$ collision data recorded with the LHCb detector in 20…

A model-independent measurement of the CKM angle $I^^{3}$ in partially reconstructed $B^{\pm} \to D^{*} h^{\pm}$ decays with $D \to K_{S}^{0} h^{+} h^{-}$ $(h = I ¨ , K)$

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

A measurement of $C P$ -violating observables in $B^{\pm} \to D^{*} K^{\pm}$ and $B^{\pm} \to D^{*} I ¨ ^{\pm}$ decays is made where the photon or neutral pion from the $D^{*} \to DÎ…

Observation of a narrow pentaquark state, $P_{c} (4312)^{+}$ , and of two-peak structure of the $P_{c} (4450)^{+}$

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +866

A narrow pentaquark state, $P_{c} (4312)^{+}$ , decaying to $J / I ¨ p$ is discovered with a statistical significance of $7.3 I ¨ $ in a data sample of $I^_{b}^{0} \to J / I ¨ p K^{-}$ decays which is a…

Constraints on the CKM angle $I^^{3}$ from $B^{\pm} \to D h^{\pm}$ decays using $D \to h^{\pm} h^{' \mp} I ¨ ^{0}$ final states

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +994

A data sample collected with the LHCb detector corresponding to an integrated luminosity of 9 fb $^{- 1}$ is used to measure eleven $C P$ violation observables in $B^{\pm} \to D h^{\pm}$ de…

Observation of the $B_{s}^{0} \to D^{+} D^{-}$ decay

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1059

The first observation of the $B_{s}^{0} \to D^{*+} D^{*-}$ decay and the measurement of its branching ratio relative to the $B^{0} \to D^{*+} D^{*-}$ decay are presented. The data sample…

Amplitude analysis of the $B^{+} \to I ¨ ^{+} I ¨ ^{+} I ¨ ^{-}$ decay

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +868

The results of an amplitude analysis of the charmless three-body decay $B^{+} \to I ¨ ^{+} I ¨ ^{+} I ¨ ^{-}$ , in which $C P$ -violation effects are taken into account, are reported. The a…

Simultaneous determination of CKM angle $I^^{3}$ and charm mixing parameters

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +994

A combination of measurements sensitive to the $C P$ violation angle $I^^{3}$ of the Cabibbo-Kobayashi-Maskawa unitarity triangle and to the charm mixing parameters that describe oscill…

Search for the rare decays $B_{s}^{0} \to e^{+} e^{-}$ and $B^{0} \to e^{+} e^{-}$

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +902

A search for the decays $B_{s}^{0} \to e^{+} e^{-}$ and $B^{0} \to e^{+} e^{-}$ is performed using data collected with the LHCb experiment in proton-proton collisions at center-of-mass energies of $…

Search for the doubly heavy baryon $I^_{bc}^{+}$ decaying to $J / I ¨ I^_{c}^{+}$

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +999

A first search for the $I^_{bc}^{+} \to J/ I ¨ I^_{c}^{+}$ decay is performed by the LHCb experiment with a data sample of proton-proton collisions, corresponding to an integr…

Search for the doubly charmed baryon $I^_{cc}^{+}$ in the $I^_{c}^{+} I ¨ ^{-} I ¨ ^{+}$ final state

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

A search for the doubly charmed baryon $I^_{cc}^{+}$ is performed in the $I^_{c}^{+} I ¨ ^{-} I ¨ ^{+}$ invariant-mass spectrum, where the $I^_{c}^{+}$ baryon is reconstructed…

First observation of excited $I^c ◯_{b}^{-}$ states

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +901

We report four narrow peaks in the $I^_{b}^{0} K^{-}$ mass spectrum obtained using $pp$ collisions at center-of-mass energies of 7, 8 and 13 TeV, corresponding to a total integrated lumin…

First observation of the $B^{+} \to D_{s}^{+} D_{s}^{-} K^{+}$ decay

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

The $B^{+} \to D_{s}^{+} D_{s}^{-} K^{+}$ decay is observed for the first time using proton-proton collision data collected by the LHCb detector at centre-of-mass energies of $7$ , $8$ …

Observation of an exotic narrow doubly charmed tetraquark

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +994

Conventional hadronic matter consists of baryons and mesons made of three quarks and quark-antiquark pairs, respectively. The observation of a new type of hadronic state, a doubly…

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

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +956

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

Evidence of a $J / I ¨ Λ$ structure and observation of excited $Ξ^{-}$ states in the $Ξ_{b}^{-} \to J / I ¨ Λ K^{-}$ decay

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +959

First evidence of a structure in the $J / I ¨ Λ$ invariant mass distribution is obtained from an amplitude analysis of $Ξ_{b}^{-} \to J / I ¨ Λ K^{-}$ decays. The observed…

Search for massive long-lived particles decaying semileptonically at sqrt(s)=13 TeV

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +996

A search is performed for massive long-lived particles (LLP) decaying semileptonically into a muon and two quarks. Two kinds of LLP production processes were considered. In the fir…

Measurement of CP violation in the $B_{s}^{0} \to I ¨ I ¨ $ decay and search for the $B^{0} \to I ¨ I ¨ $ decay

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +868

A measurement of the time-dependent CP-violating asymmetry in $B_{s}^{0} \to I ¨ I ¨ $ decays is presented. Using a sample of proton-proton collision data corresponding to an integra…

hep-ex2025

A measurement of $I^ I^_{s}$

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

Using a dataset corresponding to $9 fb^{- 1}$ of integrated luminosity collected with the LHCb detector between 2011 and 2018 in proton-proton collisions, the decay-time di…

First observation of $I^_{b}^{0} \to I^£_{c}^{() ++} D^{() -} K^{-}$ decays

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

The four decays, $I^_{b}^{0} \to I^£_{c}^{(*) ++} D^{(*) -} K^{-}$ , are observed for the first time using proton-proton collision data collected with the LHCb detector at a cent…

Observation of new baryons in the $I^_{b}^{-} I ¨ ^{+} I ¨ ^{-}$ and $I^_{b}^{0} I ¨ ^{+} I ¨ ^{-}$ systems

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

The first observation and study of two new baryonic structures in the final state $I^_{b}^{0} I ¨ ^{+} I ¨ ^{-}$ and the confirmation of the $I^_{b} (6100)^{-}$ state in the $I^_{b}^{-} I ¨ ^{+} I ¨ ^{-}$ decay mo…

Helium identification with LHCb

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

The identification of helium nuclei at LHCb is achieved using a method based on measurements of ionisation losses in the silicon sensors and timing measurements in the Outer Tracke…

Search for $CP$ violation in the phase space of $D^{0} \to K_{S}^{0} K^{\pm} I ¨ ^{\mp}$ decays with the energy test

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1091

A search for $CP$ violation in $D^{0} \to K_{S}^{0} K^{+} I ¨ ^{-}$ and $D^{0} \to K_{S}^{0} K^{-} I ¨ ^{+}$ decays is reported. The search is performed usin…

Measurement of $I ¨ _{c 1} (3872)$ production in proton-proton collisions at $s = 8$ and $13$ TeV

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +997

The production cross-section of the $I ¨ _{c 1} (3872)$ state relative to the $I ¨ (2 S)$ meson is measured using proton-proton collision data collected with the LHCb experiment at centre…

Angular analysis of the rare decay $B_{s}^{0} \to I ¨ I^¼^{+} I^¼^{-}$

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

An angular analysis of the rare decay $B_{s}^{0} \to I ¨ I^¼^{+} I^¼^{-}$ is presented, using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of $…

Study of $B_{c}^{+}$ meson decays to charmonia plus multihadron final states

LHCb Collaboration, R. Aaij, A. S. W. Abdelmotteleb +1058

Four decay modes of the $B_{c}^{+}$ meson into a $J / I ¨ $ meson and multiple charged kaons or pions are studied using proton-proton collision data, collected with the~LHCb detector at ce…

Search for time-dependent $C P$ violation in $D^{0} \to K^{+} K^{-}$ and $D^{0} \to I ¨ ^{+} I ¨ ^{-}$ decays

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +953

A search for time-dependent violation of the charge-parity symmetry in $D^{0} \to K^{+} K^{-}$ and $D^{0} \to I ¨ ^{+} I ¨ ^{-}$ decays is performed at the LHCb experiment using proton-proton coll…

Observation of the $B_{s}^{0} \to D^{*\pm} D^{\mp}$ decay

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +963

A search for the $B_{s}^{0} \to D^{*\pm} D^{\mp}$ decay is performed using proton-proton collision data at centre-of-mass energies of $7$ , $8$ and $13 TeV$ collected by…

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…

Amplitude analysis of the $I^_{b}^{0} \to p K^{-} I^^{3}$ decay

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

The resonant structure of the radiative decay $I^_{b}^{0} \to p K^{-} I^^{3}$ in the region of proton-kaon invariant-mass up to 2.5 GeV $/ c^{2}$ is studied using proton-proton collision data recor…

First observation of the decay $B_{s}^{0} \to K^{-} I^¼^{+} I^½_{I^} ¼$ and a measurement of $∣ V_{u b} ∣/∣ V_{c b} ∣$

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +961

The first observation of the suppressed semileptonic $B_{s}^{0} \to K^{-} I^¼^{+} I^½_{I^} ¼$ decay is reported. Using a data sample recorded in {\it pp} collisions in 2012 with the LHCb detector,…

Measurement of $C P$ asymmetry in $D^{0} \to K_{S}^{0} K_{S}^{0}$ decays

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +955

A measurement of the $C P$ asymmetry in $D^{0} \to K_{S}^{0} K_{S}^{0}$ decays is reported, based on a data sample of proton-proton collisions collected by the LHCb experiment from 2015 to 20…

Search for $C P$ violation in the phase space of $D^{0} \to I ¨ ^{-} I ¨ ^{+} I ¨ ^{0}$ decays with the energy test

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1046

A search for $C P$ violation in $D^{0} \to I ¨ ^{-} I ¨ ^{+} I ¨ ^{0}$ decays is reported, using $pp$ collision data collected by the LHCb experiment from 2015 to 2018 corresponding to an integrate…

Observation of the doubly charmed baryon decay $I^_{cc}^{++} \to I^_{c}^{^{'} +} I ¨ ^{+}$

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

The $I^_{cc}^{++} \to I^_{c}^{^{'} +} I ¨ ^{+}$ decay is observed using proton-proton collisions collected by the LHCb experiment at a centre-of-mass energy of $13\mathrm{\,Te\kern -0…

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

LHCb collaboration, R. Aaij, C. AbelÃ¡n Beteta +905

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

Observation of a new $I^_{b}^{0}$ state

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +957

Using a proton-proton collision data sample collected by the LHCb experiment, corresponding to an integrated luminosity of 8.5 fb $^{- 1}$ , the observation of a new excited $I^_{b}^{0}$ …

Measurements of $C P$ asymmetries and branching fraction ratios of $B^{-}$ decays to two charm mesons

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1053

The $C P$ asymmetries of seven $B^{-}$ decays to two charm mesons are measured using data corresponding to an integrated luminosity of $9 fb^{- 1}$ of proton-proton collisions c…

Measurement of the CKM angle $I^^{3}$ in $B^{\pm} \to D K^{\pm}$ and $B^{\pm} \to D I ¨ ^{\pm}$ decays with $D \to K_{S}^{0} h^{+} h^{-}$

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +975

A measurement of $C P$ -violating observables is performed using the decays $B^{\pm} \to D K^{\pm}$ and $B^{\pm} \to D I ¨ ^{\pm}$ , where the $D$ meson is reconstructed in one of the self-conjug…

Branching fraction measurements of the rare $B_{s}^{0} \to I ¨ I^¼^{+} I^¼^{-}$ and $B_{s}^{0} \to f_{2}^{'} (1525) I^¼^{+} I^¼^{-}$ decays

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +959

The branching fraction of the rare $B_{s}^{0} \to I ¨ I^¼^{+} I^¼^{-}$ decay is measured using data collected by the LHCb experiment at center-of-mass energies of $7$ , $8$ and $13\,\rm{Te…

Measurement of $C P$ violation in $B^{0} \to D^{*\pm} D^{\mp}$ decays

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +901

The decay-time-dependent $C P$ asymmetry in $B^{0} \to D^{*\pm} D^{\mp}$ decays is measured using a data set corresponding to an integrated luminosity of $9$ fb $^{- 1}$ recorded by the L…

Study of $C P$ violation in $B_{(s)}^{0} \to D K^{*} (892)^{0}$ decays with $D \to K I ¨ (I ¨ I ¨ )$ , $I ¨ I ¨ (I ¨ I ¨ )$ , and $K K$ final states

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1076

A measurement of $C P$ -violating observables associated with the interference of $B^{0} \to D^{0} K^{*} (892)^{0}$ and $B^{0} \to D ˉ^{0} K^{*} (892)^{0}$ decay amplitudes is performed in the $D^…

Observation of the decay $I^_{b}^{0} \to I^_{c}^{+} I ¨ ^{-} I^½_{I ¨} $

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

The first observation of the semileptonic $b$ -baryon decay $I^_{b}^{0} \to I^_{c}^{+} I ¨ ^{-} I^½_{I ¨} $ , with a significance of $6.1 I ¨ $ , is reported using a data sample corres…

Identification of charm jets at LHCb

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +994

The identification of charm jets is achieved at LHCb for data collected in 2015-2018 using a method based on the properties of displaced vertices reconstructed and matched with jet…

Measurement of associated $J / I ¨ $ - $I ¨ (2 S)$ production cross-section in $pp$ collisions at $s = 13$ TeV

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1080

The cross-section of associated $J / I ¨ $ - $I ¨ (2 S)$ production in proton-proton collisions at a centre-of-mass energy of $s = 13$ TeV is measured using a data sample corresponding…

Amplitude analysis of the $B^{0} \to K^{* 0} I^¼^{+} I^¼^{-}$ decay

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

An amplitude analysis of the $B^{0} \to K^{* 0} I^¼^{+} I^¼^{-}$ decay is presented using a dataset corresponding to an integrated luminosity of $4.7$ fb $^{- 1}$ of $pp$ collision data collec…

Measurement of $C P$ -violating and mixing-induced observables in $B_{s}^{0} \to I ¨ I^^{3}$ decays

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +859

A time-dependent analysis of the $B_{s}^{0} \to I ¨ I^^{3}$ decay rate is performed to determine the $C P$ -violating observables $S_{I ¨ I^^{3}}$ and $C_{I ¨ I^^{3}}$ , and the mixing-induced observable $…

Search for the lepton-flavour violating decays $B^{0} \to K^{* 0} I^¼^{\pm} e^{\mp}$ and $B_{s}^{0} \to I ¨ I^¼^{\pm} e^{\mp}$

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1003

A search for the lepton-flavour violating decays $B^{0} \to K^{* 0} I^¼^{\pm} e^{\mp}$ and $B_{s}^{0} \to I ¨ I^¼^{\pm} e^{\mp}$ is presented, using proton-proton collision data collected by the LHCb…

Search for the rare decay $B^{0} \to J / I ¨ I ¨ $

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +962

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

Measurement of $f_{s} / f_{u}$ variation with proton-proton collision energy and $B$ -meson kinematics

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +903

The ratio of the $B_{s}^{0}$ and $B^{+}$ fragmentation fractions $f_{s}$ and $f_{u}$ is studied with $B_{s}^{0} \to J / I ¨ I ¨ $ and $B^+\to\mathrm…

$J / I ¨ $ photo-production in Pb-Pb peripheral collisions at $s_{NN}$ = 5 TeV

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +942

The photo-production of $J / I ¨ $ mesons at low transverse momentum is studied in peripheral lead-lead collisions collected by the LHCb experiment at a centre-of-mass energy per nucle…

Measurement of $C P$ observables in the process $B^{0} \to D K^{* 0}$ with two- and four-body $D$ decays

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +876

Measurements of $C P$ observables in $B^{0} \to D K^{* 0}$ decays are presented, where $D$ represents a superposition of $D^{0}$ and $D ˉ^{0}$ states. The $D$ meson is reconstructed i…

Measurement of the mass difference and relative production rate of the $I^c ◯_{b}^{-}$ and $I^_{b}^{-}$ baryons

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1050

The mass difference between the $I^c ◯_{b}^{-}$ and $I^_{b}^{-}$ baryons is measured using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated lumino…

Associated production of prompt $J / I ¨ $ and $I^¥$ mesons in $pp$ collisions at $s = 13 TeV$

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1045

The associated production of prompt $J / I ¨ $ and $I^¥$ mesons in $pp$ collisions at a centre-of-mass energy of $s = 13 TeV$ is studied using LHCb data,…

Tests of lepton universality using $B^{0} \to K_{S}^{0} ℓ^{+} ℓ^{-}$ and $B^{+} \to K^{*+} ℓ^{+} ℓ^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +997

Tests of lepton universality in $B^{0} \to K_{S}^{0} ℓ^{+} ℓ^{-}$ and $B^{+} \to K^{*+} ℓ^{+} ℓ^{-}$ decays where $ℓ$ is either an electron or a muon are presented. The differential b…

Modification of $I ¨ _{c 1}$ (3872) and $I ¨ $ (2 $S$ ) production in $p$ Pb collisions at $s_{N N} = 8.16$ TeV

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1085

The LHCb collaboration measures production of the exotic hadron $I ¨ _{c 1}$ (3872) in proton-nucleus collisions for the first time. Comparison with the charmonium state $I ¨ $ (2 $S$ ) sug…

nucl-ex2023

Nuclear modification factor of neutral pions in the forward and backward regions in $p$ -Pb collisions

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +999

The nuclear modification factor of neutral pions is measured in proton-lead collisions collected at a center-of-mass energy per nucleon of $8.16 TeV$ with the LHCb detector.…

Search for the radiative $I^_{b}^{-} \to I^^{-} I^^{3}$ decay

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +986

The first search for the rare radiative decay $I^_{b}^{-} \to I^^{-} I^^{3}$ is performed using data collected by the LHCb experiment in proton-proton collisions at a center-of-mass energy o…