L. Carson

First measurement of the charge asymmetry in beauty-quark pair production at a hadron collider

R. Aaij, B. Adeva, M. Adinolfi +700

The difference in the angular distributions between beauty quarks and antiquarks, referred to as the charge asymmetry, is measured for the first time in $b b ˉ$ pair production…

Measurement of the CP-violating phase $I^^{2}$ in $B^{0} \to J / I ¨ I ¨ ^{+} I ¨ ^{-}$ decays and limits on penguin effects

LHCb collaboration, R. Aaij, B. Adeva +697

Time-dependent CP violation is measured in the $B^{0} \to J / I ¨ I ¨ ^{+} I ¨ ^{-}$ channel for each $I ¨ ^{+} I ¨ ^{-}$ resonant final state using data collected with an integrated luminosity of…

hep-ex2011

Determination of f_s/f_d for 7 TeV pp collisions and a measurement of the branching fraction of the decay Bd->D-K+

LHCb Collaboration, R. Aaij, B. Adeva +548

The relative abundance of the three decay modes $B_{d} \to D^{-} K^{+}$ , $B_{d} \to D^{-} I ¨ ^{+}$ and $B_{s} \to D_{s}^{-} I ¨ ^{+}$ produced in 7 TeV $pp$ collisions at the LHC is determined from data…

Evidence for the decay $B_{s}^{0} \to K^{* 0} I^¼^{+} I^¼^{-}$

LHCb collaboration, R. Aaij, B. Adeva +788

A search for the decay $B_{s}^{0} \to K^{* 0} I^¼^{+} I^¼^{-}$ is presented using data sets corresponding to 1.0, 2.0 and 1.6 $fb^{- 1}$ of integrated luminosity co…

Measurement of the B0bar-B0 and Bsbar-Bs production asymmetries in pp collisions at sqrt(s)=7 TeV

LHCb collaboration, R. Aaij, B. Adeva +700

The B0bar-B0 and Bsbar-Bs production asymmetries, AP(B0) and AP(Bs), are measured by means of a time-dependent analysis of B0 -> J/ÏK*0, B0 -> D- pi+ and Bs -> Ds- pi+ decays, usi…

Measurement of forward $t t$ , $W + b b$ and $W + c c$ production in $pp$ collisions at $s = 8$ TeV

LHCb collaboration, R. Aaij, B. Adeva +767

The production of $t t$ , $W + b b$ and $W + c c$ is studied in the forward region of proton-proton collisions collected at a centre-of-mass energy of 8 Te…

Model-independent measurement of mixing parameters in $D^{0} \to K_{S} I ¨ ^{+} I ¨ ^{-}$ decays

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +724

The first model-independent measurement of the charm mixing parameters in the decay $D^{0} \to K_{S} I ¨ ^{+} I ¨ ^{-}$ is reported, using a sample of $pp$ collision data recorded by the LHCb…

Measurement of forward top pair production in the dilepton channel in $pp$ collisions at $s = 13$ TeV

LHCb collaboration, R. Aaij, B. Adeva +791

Forward top quark pair production is studied in $pp$ collisions in the $I^¼ e b$ final state using a data sample corresponding to an integrated luminosity of 1.93 fb $^{- 1}$ collected…

Observation of excited Lambda_b0 baryons

LHCb collaboration, R. Aaij, C. Abellan Beteta +615

Using pp collision data corresponding to 1.0 fb-1 integrated luminosity collected by the LHCb detector, two narrow states are observed in the Lambda_b0pi+pi- spectrum with masses 5…

Study of the rare $B_{s}^{0}$ and $B^{0}$ decays into the $I ¨ ^{+} I ¨ ^{-} I^¼^{+} I^¼^{-}$ final state

LHCb collaboration, R. Aaij, B. Adeva +699

A search for the rare decays $B_{s}^{0} \to I ¨ ^{+} I ¨ ^{-} I^¼^{+} I^¼^{-}$ and $B^{0} \to I ¨ ^{+} I ¨ ^{-} I^¼^{+} I^¼^{-}$ is performed in a data set corresponding to an integrated luminosity of 3.0 fb $^{- 1}$ colle…

Measurement of the $B_{s}^{0} \to I^¼^{+} I^¼^{-}$ branching fraction and search for $B^{0} \to I^¼^{+} I^¼^{-}$ decays at the LHCb experiment

LHCb collaboration, R. Aaij, B. Adeva +650

A search for the rare decays $B_{s}^{0} \to I^¼^{+} I^¼^{-}$ and $B^{0} \to I^¼^{+} I^¼^{-}$ is performed at the LHCb experiment. The data analysed correspond to an integrated luminosity of 1 fb $^{- 1}$ …

Measurement of forward $W \to e I^½$ production in $pp$ collisions at $s = 8$ TeV

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

A measurement of the cross-section for $W \to e I^½$ production in $pp$ collisions is presented using data corresponding to an integrated luminosity of $2$ fb $^{- 1}$ collected by th…

Search for Majorana neutrinos in $B^{-} \to I ¨ ^{+} I^¼^{-} I^¼^{-}$ decays

LHCb collaboration, R. Aaij, B. Adeva +674

A search for heavy Majorana neutrinos produced in the $B^{-} \to I ¨ ^{+} I^¼^{-} I^¼^{-}$ decay mode is performed using 3 fb $^{- 1}$ of integrated luminosity collected with the LHCb detector in…

First observation of the decay Bc+ to J/psi pi+pi-pi+

LHCb collaboration, R. Aaij, C. Abellan Beteta +592

The decay Bc+ --> J/psi pi+pi-pi+ is observed for the first time, using 0.8 fb-1 of pp collisions at sqrt{s}=7 TeV collected by the LHCb experiment. The ratio of branching fraction…

Measurements of the branching fractions of the decays $B_{s}^{0} \to D_{s}^{\mp} K^{\pm}$ and $B_{s}^{0} \to D_{s}^{-} I ¨ ^{+}$

The LHCb collaboration, R. Aaij, C. Abellan Beteta +592

The decay mode $\B^{0}_{s} \to D^{\mp}_{s} K^{\pm} $ allows for one of the theoretically cleanest measurements of the CKM angle $I^^{3}$ through the study of time-dependent $\ensuremat…

Observation of X(3872) production in pp collisions at sqrt(s)= 7 TeV

LHCb Collaboration, R. Aaij, C. Abellan Beteta +585

Using 34.7 pb-1 of data collected with the LHCb detector, the inclusive production of the X(3872) meson in pp collisions at sqrt(s) = 7 TeV is observed for the first time. Candidat…

Search for the rare decay $I^_{c}^{+} \to p I^¼^{+} I^¼^{-}$

LHCb collaboration, R. Aaij, B. Adeva +792

A search for the flavor-changing neutral-current decay $I^_{c}^{+} \to p I^¼^{+} I^¼^{-}$ is reported using a data set corresponding to an integrated luminosity of $3.0 f b^{- 1}$ collect…

Measurement of the $B^{\pm}$ production cross-section in pp collisions at $s =$ 7 and 13 TeV

LHCb collaboration, R. Aaij, B. Adeva +796

The production of $B^{\pm}$ mesons is studied in $pp$ collisions at centre-of-mass energies of 7 and 13 TeV, using $B^{\pm} \to J / I ¨ K^{\pm}$ decays and data samples correspo…

Angular analysis and differential branching fraction of the decay $B_{s}^{0} \to I ¨ I^¼^{+} I^¼^{-}$

LHCb collaboration, R. Aaij, B. Adeva +722

An angular analysis and a measurement of the differential branching fraction of the decay $B_{s}^{0} \to I ¨ I^¼^{+} I^¼^{-}$ are presented, using data corresponding to an integrated luminosity o…

Measurement of the $B ˉ_{s}^{0} \to D_{s}^{-} D_{s}^{+}$ and $B ˉ_{s}^{0} \to D^{-} D_{s}^{+}$ effective lifetimes

LHCb collaboration, R. Aaij, B. Adeva +672

The first measurement of the effective lifetime of the $B ˉ_{s}^{0}$ meson in the decay $B ˉ_{s}^{0} \to D_{s}^{-} D_{s}^{+}$ is reported using a proton-proton collision dataset, correspondi…

Search for the decay Bs -> D*-+ Ï+-

LHCb collaboration, R. Aaij, C. Abellan Beteta +619

A search for the decay Bs -> D*-+ Ï+- is presented using a data sample corresponding to an integrated luminosity of 1.0 fb-1 of pp collisions collected by LHCb. This decay is expe…

Measurement of the exclusive $I^¥$ production cross-section in $pp$ collisions at $s =$ 7 TeV and 8 TeV

LHCb collaboration, R. Aaij, B. Adeva +705

A study is presented of central exclusive production of $I^¥ (n S)$ states, where the $I^¥ (n S)$ resonances decay to the $I^¼^{+} I^¼^{-}$ final state, using $pp$ collision data recorded by th…

Measurements of $B_{c}^{+}$ production and mass with the $B_{c}^{+} \to J / I ¨ I ¨ ^{+}$ decay

LHCb collaboration, R. Aaij, C. Abellan Beteta +617

Measurements of $B_{c}^{+}$ production and mass are performed with the decay mode $B_{c}^{+} \to J / I ¨ I ¨ ^{+}$ using 0.37 fb $^{- 1}$ of data collected in $pp$ collisions at $s = 7$ TeV by…

First observations of the rare decays $B^{+} - > K^{+} I ¨ ^{+} I ¨ ^{-} I^¼^{+} I^¼^{-}$ and $B^{+} - > I ¨ K^{+} I^¼^{+} I^¼^{-}$

LHCb collaboration, R. Aaij, B. Adeva +697

First observations of the rare decays $B^{+} \to K^{+} I ¨ ^{+} I ¨ ^{-} I^¼^{+} I^¼^{-}$ and $B^{+} \to I ¨ K^{+} I^¼^{+} I^¼^{-}$ are presented using data corresponding to an integrated luminosity of…

Measurement of resonant and $C P$ components in $B_{s}^{0} \to J / I ¨ I ¨ ^{+} I ¨ ^{-}$ decays

LHCb collaboration, R. Aaij, B. Adeva +680

The resonant structure of the decay $B_{s}^{0} \to J / I ¨ I ¨ ^{+} I ¨ ^{-}$ is studied using data corresponding to 3 fb $^{- 1}$ of integrated luminosity from $pp$ collisions by the LHC a…

Measurements of prompt charm production cross-sections in $pp$ collisions at $s = 13 TeV$

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +724

Production cross-sections of prompt charm mesons are measured with the first data from $pp$ collisions at the LHC at a centre-of-mass energy of $13 TeV$ . The data sample…

Observation of the $B_{s}^{0} \to J / I ¨ K_{S}^{0} K^{\pm} I ¨ ^{\mp}$ decay

LHCb collaboration, R. Aaij, B. Adeva +696

Decays of the form $B_{(s)}^{0} \to J / I ¨ K_{S}^{0} h^{+} h^{(') -}$ ( $h^{(')} = K, I ¨ $ ) are searched for in proton-proton collision data corresponding…

Quantum numbers of the $X (3872)$ state and orbital angular momentum in its $I ¨ ^{0} J I ¨ $ decay

LHCb collaboration, R. Aaij, C. Abellan Beteta +619

Angular correlations in $B^{+} \to X (3872) K^{+}$ decays, with $X (3872) \to I ¨ ^{0} J / I ¨ $ , $I ¨ ^{0} \to I ¨ ^{+} I ¨ ^{-}$ and $J / I ¨ \to I^¼^{+} I^¼^{-}$ , are used to measure orbital angular momentum contribution…

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

LHCb collaboration, R. Aaij, B. Adeva +650

A search for the lepton-flavour violating decays $B_{s}^{0} \to e^{\pm} I^¼^{\mp}$ and $B^{0} \to e^{\pm} I^¼^{\mp}$ is performed with a data sample, corresponding to an integrated luminos…

First observation and measurement of the branching fraction for the decay $B_{s}^{0} \to D_{s}^{*\mp} K^{\pm}$

LHCb Collaboration, R. Aaij, B. Adeva +697

The first observation of the $B_{s}^{0} \to D_{s}^{*\mp} K^{\pm}$ decay is reported using 3.0 $f b^{- 1}$ of proton-proton collision data collected by the LHCb experiment. The $D_{s}^{*\mp}$ …

Measurement of J/psi production in pp collisions at sqrt(s)=2.76 TeV

LHCb collaboration, R. Aaij, C. Abellan Beteta +624

The production of J/psi mesons is studied with the LHCb detector using data from pp collisions at sqrt(s)=2.76 TeV corresponding to an integrated luminosity of 71 nb^-1. The differ…

Measurement of the CP-violating phase $I ¨ _{s}$ in $B_{s}^{0} \to J / I ¨ I ¨ ^{+} I ¨ ^{-}$ decays

LHCb collaboration, R. Aaij, B. Adeva +697

The mixing-induced CP-violating phase $I ¨ _{s}$ in $B_{s}^{0}$ and $B_{s}^{0}$ decays is measured using the $J / I ¨ I ¨ ^{+} I ¨ ^{-}$ final state in data, taken from 3\,fb $^{- 1}$ of integra…

Search for CP violation in D+ -> phi pi+ and Ds+ -> Ks pi+ decays

LHCb collaboration, R. Aaij, C. Abellan Beteta +619

A search for CP violation in D+ -> phi pi+ decays is performed using data collected in 2011 by the LHCb experiment corresponding to an integrated luminosity of 1.0 fb^{-1} at a cen…

Forward production of $I^¥$ mesons in $pp$ collisions at $s = 7$ and 8TeV

LHCb collaboration, R. Aaij, B. Adeva +720

The production of $I^¥$ mesons in $pp$ collisions at $= 7$ and $8 TeV$ is studied with the LHCb detector using data samples corresponding to an integrated luminosity o…

First evidence for the annihilation decay mode $B^{+} \to D_{s}^{+} I ¨ $

LHCb collaboration, R. Aaij, C. Abellan Beteta +617

Evidence for the hadronic annihilation decay mode $B^{+} \to D_{s}^{+} I ¨ $ is found with greater than $3 I ¨ $ significance. The branching fraction and \CP asymmetry are measured to be \…

hep-ex2019

First measurement of charm production in fixed-target configuration at the LHC

LHCb collaboration, R. Aaij, B. Adeva +834

The first measurement of heavy-flavour production by the LHCb experiment in its fixed-target mode is presented. The production of $J / I ¨ $ and $D^{0}$ mesons is studied with beams of p…

Search for the rare decay $D^{0} \to I^¼^{+} I^¼^{-}$

LHCb collaboration, R. Aaij, C. Abellan Beteta +634

A search for the rare decay $D^{0} \to I^¼^{+} I^¼^{-}$ is performed using a data sample, corresponding to an integrated luminosity of 0.9 fb $^{- 1}$ , of $pp$ collisions collected at a centr…

First observation of the decay $D^{0} \to K^{-} I ¨ ^{+} I^¼^{+} I^¼^{-}$ in the $I ¨ ^{0}$ - $I ¨ $ region of the dimuon mass spectrum

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +730

A study of the decay $D^{0} \to K^{-} I ¨ ^{+} I^¼^{+} I^¼^{-}$ is performed using data collected by the LHCb detector in proton-proton collisions at a centre-of-mass energy of 8 T…

A study of CP violation in $B^{\pm} \to D K^{\pm}$ and $B^{\pm} \to D I ¨ ^{\pm}$ decays with $D \to K_{S}^{0} K^{\pm} I ¨ ^{\mp}$ final states

LHCb collaboration, R. Aaij, B. Adeva +682

A first study of CP violation in the decay modes $B^{\pm} \to [K_{S}^{0} K^{\pm} I ¨ ^{\mp}]_{D} h^{\pm}$ and $B^{\pm} \to [K_{S}^{0} K^{\mp} I ¨ ^{\pm}]_{D} h^{\pm}$ , where $h$ labels a $K$ or $I ¨ $ mes…

Observation of Bs -> J/Ïf'2(1525) in J/ÏK+K- final states

LHCb Collaboration, R. Aaij, C. Abellan Beteta +583

The decay Bs -> J/ÏK+ K- is investigated using 0.16/fb of data collected with the LHCb detector using 7 TeV pp collisions. Although the J/ÏÏ channel is well known, final states…

Measurement of the effective $B_{s}^{0} \to K^{+} K^{-}$ lifetime

LHCb collaboration, R. Aaij, C. Abellan Beteta +616

A precise determination of the effective $B_{s}^{0} \to K^{+} K^{-}$ lifetime can be used to constrain contributions from physics beyond the Standard Model in the $B_{s}^{0}$ meson sys…

Observation of the $B_{s}^{0} \to I^\cdot^{'} I^\cdot^{'}$ decay

LHCb collaboration, R. Aaij, B. Adeva +703

The first observation of the $B_{s}^{0} \to I^\cdot^{'} I^\cdot^{'}$ decay is reported. The study is based on a sample of proton-proton collisions corresponding to $3.0$ $f b^{- 1}$ of integrated lum…

hep-ex2019

Physics case for an LHCb Upgrade II - Opportunities in flavour physics, and beyond, in the HL-LHC era

LHCb collaboration, I. Bediaga, M. Cruz Torres +828

The LHCb Upgrade II will fully exploit the flavour-physics opportunities of the HL-LHC, and study additional physics topics that take advantage of the forward acceptance of the LHC…

First evidence for the two-body charmless baryonic decay $B^{0} \to p p ˉ$

LHCb collaboration, R. Aaij, B. Adeva +657

The results of a search for the rare two-body charmless baryonic decays $B^{0} \to p p ˉ$ and $B_{s}^{0} \to p p ˉ$ are reported. The analysis uses a data sample, corresponding t…

Measurement of the $B_{s}^{0} \to I^¼^{+} I^¼^{-}$ branching fraction and effective lifetime and search for $B^{0} \to I^¼^{+} I^¼^{-}$ decays

LHCb collaboration, R. Aaij, B. Adeva +771

A search for the rare decays $B_{s}^{0} \to I^¼^{+} I^¼^{-}$ and $B^{0} \to I^¼^{+} I^¼^{-}$ is performed at the LHCb experiment using data collected in $pp$ collisions corresponding to a total integrated…

First observation of the decay $B_{s}^{0} \to K_{S}^{0} K^{*} (892)^{0}$

LHCb collaboration, R. Aaij, B. Adeva +713

A search for $B_{(s)}^{0} \to K_{S}^{0} K^{*} (892)^{0}$ decays is performed using $pp$ collision data, corresponding to an integrated luminosity of $1.0 fb^{- 1}$ , collected…

Study of $b b ˉ$ correlations in high energy proton-proton collisions

LHCb collaboration, R. Aaij, B. Adeva +802

Kinematic correlations for pairs of beauty hadrons, produced in high energy proton-proton collisions, are studied. The data sample used was collected with the LHCb experiment at ce…

Differential branching fraction and angular analysis of the $B^{+} \to K^{+} I^¼^{+} I^¼^{-}$ decay

LHCb collaboration, R. Aaij, C. Abellan Beteta +617

The angular distribution and differential branching fraction of the decay $B^{+} \to K^{+} I^¼^{+} I^¼^{-}$ are studied with a dataset corresponding to $1.0 fb^{- 1}$ …

Measurement of the inelastic $pp$ cross-section at a centre-of-mass energy of $s = 7$ TeV

LHCb collaboration, R. Aaij, B. Adeva +699

The cross-section for inelastic proton-proton collisions, with at least one prompt long-lived charged particle of transverse momentum $p_{T} > 0.2$ GeV/ $c$ in the pseudorapidity…

Search for decays of neutral beauty mesons into four muons

LHCb collaboration, R. Aaij, B. Adeva +768

A search for the non-resonant decays $B_{s}^{0} \to I^¼^{+} I^¼^{-} I^¼^{+} I^¼^{-}$ and $B^{0} \to I^¼^{+} I^¼^{-} I^¼^{+} I^¼^{-}$ is presented. The measurement is performed using th…

Measurement of the $I ¨ _{b} (3 P)$ mass and of the relative rate of $I ¨ _{b 1} (1 P)$ and $I ¨ _{b 2} (1 P)$ production

LHCb collaboration, R. Aaij, B. Adeva +696

The production of $I ¨ _{b}$ mesons in proton-proton collisions is studied using a data sample collected by the LHCb detector, at centre-of-mass energies of $s = 7$ and $8$ TeV an…

Absolute luminosity measurements with the LHCb detector at the LHC

The LHCb Collaboration, R. Aaij, B. Adeva +571

Absolute luminosity measurements are of general interest for colliding-beam experiments at storage rings. These measurements are necessary to determine the absolute cross-sections…

First observation of the decay $B_{c}^{+} \to J / I ¨ K^{+}$

LHCb collaboration, R. Aaij, C. Abellan Beteta +632

The decay $B_{c}^{+} \to J / I ¨ K^{+}$ is observed for the first time using a data sample, corresponding to an integrated luminosity of 1.0 $f b^{- 1}$ , collected by the LHCb experiment in…

Measurement of the forward $Z$ boson production cross-section in $pp$ collisions at $s$ = 7 TeV

LHCb collaboration, R. Aaij, B. Adeva +705

A measurement of the production cross-section for $Z$ bosons that decay to muons is presented. The data were recorded by the LHCb detector during $pp$ collisions at a centre-of-mas…

Precision measurement of $C P$ violation in $B_{s}^{0} \to J / I ¨ K^{+} K^{-}$ decays

R. Aaij, B. Adeva, M. Adinolfi +696

The time-dependent $C P$ asymmetry in $B_{s}^{0} \to J / I ¨ K^{+} K^{-}$ decays is measured using $pp$ collision data, corresponding to an integrated luminosity of $3.0$ fb $^{- 1}$ , collected wit…

Measurement of D0-D0bar mixing parameters and search for CP violation using D0->K+pi- decays

LHCb collaboration, R. Aaij, B. Adeva +657

Measurements of charm mixing parameters from the decay-time-dependent ratio of D0->K+pi- to D0->K-pi+ rates and the charge-conjugate ratio are reported. The analysis uses data, cor…

nucl-ex2016

Study of $I ¨ (2 S)$ production and cold nuclear matter effects in pPb collisions at $s_{N N} = 5 TeV$

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +732

The production of $I ¨ (2 S)$ mesons is studied in dimuon final states using proton-lead collision data collected by the LHCb detector. The data sample corresponds to an integrated lu…

Study of beauty hadron decays into pairs of charm hadrons

LHCb collaboration, R. Aaij, A. Abba +694

First observations of the decays $I^_{b}^{0} \to I^_{c}^{+} D_{(s)}^{-}$ are reported using data corresponding to an integrated luminosity of $3 fb^{- 1}$ collected at 7 and 8 TeV cent…

Measurement of the fraction of \Y1S originating from \chib1P decays in $pp$ collisions at $\sqrt{s} = 7\tev$

LHCb collaboration, R. Aaij, C. Abellan Beteta +616

The production of \chib1P mesons in $pp$ collisions at a centre-of-mass energy of $7\tev$ is studied using $32\invpb$ of data collected with the \lhcb detector. The $\chib1P$ meson…

Measurement of the CP-violating phase phi_s in the decay Bs->J/psi phi

LHCb Collaboration, R. Aaij, C. Abellan Beteta +585

We present a measurement of the time-dependent CP-violating asymmetry in B_s -> J/psi phi decays, using data collected with the LHCb detector at the LHC. The decay time distributio…

Observation of the suppressed decay $I^_{b}^{0} \to p I ¨ ^{-} I^¼^{+} I^¼^{-}$

LHCb collaboration, R. Aaij, B. Adeva +768

The suppressed decay $I^_{b}^{0} \to p I ¨ ^{-} I^¼^{+} I^¼^{-}$ , excluding the $J / I ¨ $ and $I ¨ (2 S) \to I^¼^{+} I^¼^{-}$ resonances, is observed for the first time with a signif…

Differential branching fraction and angular analysis of the decay $B_{s}^{0} \to I ¨ I^¼^{+} I^¼^{-}$

LHCb collaboration, R. Aaij, C. Abellan Beteta +636

The determination of the differential branching fraction and the first angular analysis of the decay $B_{s}^{0} \to I ¨ I^¼^{+} I^¼^{-}$ are presented using data, corresponding to an integrat…

Measurement of the $C P$ violation parameter $A_{I^} $ in $D^{0} \to K^{+} K^{-}$ and $D^{0} \to I ¨ ^{+} I ¨ ^{-}$ decays

LHCb collaboration, R. Aaij, B. Adeva +769

Asymmetries in the time-dependent rates of $D^{0} \to K^{+} K^{-}$ and $D^{0} \to I ¨ ^{+} I ¨ ^{-}$ decays are measured in a $pp$ collision data sample collected with the LHCb detector during LHC R…

Search for the rare decays Bs -> mu+ mu- and B0 -> mu+ mu-

LHCb Collaboration, R. Aaij, C. Abellan Beteta +590

A search for the decays Bs -> mu+ mu- and B0 -> mu+ mu- is performed with 0.37 fb^-1 of pp collisions at sqrt{s} = 7 TeV collected by the LHCb experiment in 2011. The upper limits…

Measurement of the CP asymmetry in B0 -> K*0 mu+ mu- decays

LHCb collaboration, R. Aaij, C. Abellan Beteta +620

A measurement of the CP asymmetry in B0 -> K*0 mu+ mu- decays is presented, based on 1.0fb-1 of pp collision data recorded by the LHCb experiment during 2011. The measurement is pe…

Amplitude analysis of $B^{0} \to D ˉ^{0} K^{+} I ¨ ^{-}$ decays

LHCb collaboration, R. Aaij, B. Adeva +716

The Dalitz plot distribution of $B^{0} \to D ˉ^{0} K^{+} I ¨ ^{-}$ decays is studied using a data sample corresponding to $3.0 fb^{- 1}$ of $pp$ collision data recorded by the…

Angular analysis of charged and neutral $B \to K I^¼^{+} I^¼^{-}$ decays

LHCb collaboration, R. Aaij, B. Adeva +691

The angular distributions of the rare decays $B^{+} \to K^{+} I^¼^{+} I^¼^{-}$ and $B^{0} \to K_{S}^{0} I^¼^{+} I^¼^{-}$ are studied with data corresponding to 3fb $^{- 1}$ of integ…

Precision measurement of the mass and lifetime of the $I^_{b}^{0}$ baryon

LHCb collaboration, R. Aaij, B. Adeva +701

Using a proton-proton collision data sample corresponding to an integrated luminosity of 3 fb $^{- 1}$ collected by LHCb at center-of-mass energies of 7 and 8 TeV, about 3800 $Î_b^0…

Precision luminosity measurements at LHCb

LHCb collaboration, R. Aaij, B. Adeva +701

Measuring cross-sections at the LHC requires the luminosity to be determined accurately at each centre-of-mass energy $s$ . In this paper results are reported from the lumino…

First observation of forward $Z \to b b ˉ$ production in $pp$ collisions at $s = 8$ TeV

LHCb collaboration, R. Aaij, B. Adeva +804

The decay $Z \to b b ˉ$ is reconstructed in $pp$ collision data, corresponding to 2 fb $^{- 1}$ of integrated luminosity, collected by the LHCb experiment at a centre-of-…

Search for the suppressed decays $B^{+} \to K^{+} K^{+} I ¨ ^{-}$ and $B^{+} \to I ¨ ^{+} I ¨ ^{+} K^{-}$

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

A search is made for the highly-suppressed B meson decays $B^{+} \to K^{+} K^{+} I ¨ ^{-}$ and $B^{+} \to I ¨ ^{+} I ¨ ^{+} K^{-}$ using a data sample corresponding to an integ…

Search for beautiful tetraquarks in the $I^¥ (1 S) I^¼ I^¼$ invariant-mass spectrum

LHCb collaboration, R. Aaij, B. Adeva +836

The $I^¥ (1 S) I^¼^{+} I^¼^{-}$ invariant-mass distribution is investigated for a possible exotic meson state composed of two $b$ quarks and two $b$ quarks, $X_{b\overline{b}b\over…

nucl-ex2016

Measurements of long-range near-side angular correlations in $s_{NN} = 5$ TeV proton-lead collisions in the forward region

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +732

Two-particle angular correlations are studied in proton-lead collisions at a nucleon-nucleon centre-of-mass energy of $s_{NN} = 5$ TeV, collected with the LHCb detector…

Measurement of the Bs effective lifetime in the J/psi f0(980) final state

LHCb Collaboration, R. Aaij, C. Abellan Beteta +618

The effective lifetime of the Bs meson in the decay mode Bs->J/Ïf0(980) is measured using 1.0/fb of data collected in pp collisions at sqrt(s) = 7 TeV with the LHCb detector. The…

Measurements of the branching fractions and CP asymmetries of B+ to J/psi pi+ and B+ to psi(2S) pi+ decays

LHCb collaboration, R. Aaij, C. Abellan Beteta +589

A study of B+ to J/psi pi+ and B+ to psi(2S) pi+ decays is performed with data corresponding to 0.37 fb-1 of proton-proton collisions at sqrt(s)=7 TeV. Their branching fractions ar…

Opposite-side flavour tagging of B mesons at the LHCb experiment

LHCb Collaboration, R. Aaij, C. Abellan Beteta +594

The calibration and performance of the opposite-side flavour tagging algorithms used for the measurements of time-dependent asymmetries at the LHCb experiment are described. The al…

Measurement of CP violation in the phase space of $B^{\pm} \to K^{\pm} I ¨ ^{+} I ¨ ^{-}$ and $B^{\pm} \to K^{\pm} K^{+} K^{-}$ decays

LHCb collaboration, R. Aaij, B. Adeva +647

The charmless decays $B^{\pm} \to K^{\pm} I ¨ ^{+} I ¨ ^{-}$ and $B^{\pm} \to K^{\pm} K^{+} K^{-}$ are reconstructed using data, corresponding to an integrated luminosity of 1.0 fb $^{- 1}$ , collected…

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

LHCb collaboration, R. Aaij, B. Adeva +787

The decay $I^_{b}^{0} \to I^_{c}^{+} p p I ¨ ^{-}$ is observed using $pp$ collision data collected with the LHCb detector at centre-of-mass energies of $s =$ 7 and 8 TeV, corr…

nucl-ex2014

Study of $J / I ¨ $ production and cold nuclear matter effects in $p$ Pb collisions at $s_{N N} = 5 TeV$

LHCb collaboration, R. Aaij, B. Adeva +656

The production of $J / I ¨ $ mesons with rapidity $1.5 < y < 4.0$ or $- 5.0 < y < - 2.5$ and transverse momentum $p_{T} < 14 GeV / c$ is studied with the LHCb detector in proton-lead…

Searches for $I^_{b}^{0}$ and $I^_{b}^{0}$ decays to $K_{S}^{0} p I ¨ ^{-}$ and $K_{S}^{0} p K^{-}$ final states with first observation of the $I^_{b}^{0} \to K_{S}^{0} p I ¨ ^{-}$ decay

LHCb collaboration, R. Aaij, B. Adeva +671

A search for previously unobserved decays of beauty baryons to the final states $K_{S}^{0} p I ¨ ^{-}$ and $K_{S}^{0} p K^{-}$ is reported. The…

Measurement of the $C P$ asymmetry in $B^{-} \to D_{s}^{-} D^{0}$ and $B^{-} \to D^{-} D^{0}$ decays

LHCb collaboration, R. Aaij, B. Adeva +787

The $C P$ asymmetry in $B^{-} \to D_{s}^{-} D^{0}$ and $B^{-} \to D^{-} D^{0}$ decays is measured using LHCb data corresponding to an integrated luminosity of 3.0 fb $^{- 1}$ , collected in $pp$ collisi…

Updated search for long-lived particles decaying to jet pairs

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

A search is presented for long-lived particles with a mass between 25 and 50 GeV/ $c^{2}$ and a lifetime between 2 and 500 ps, using proton-proton collision data corresponding to an i…

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

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +730

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

Studies of the resonance structure in $D^{0} \to K_{S}^{0} K^{\pm} I ¨ ^{\mp}$ decays

LHCb collaboration, R. Aaij, B. Adeva +722

Amplitude models are applied to studies of resonance structure in $D^{0} \to K_{S}^{0} K^{-} I ¨ ^{+}$ and $D^{0} \to K_{S}^{0} K^{+} I ¨ ^{-}$ decays using $pp$ collision data corresponding to an integrate…

Observation of associated production of a $Z$ boson with a $D$ meson in the~forward region

LHCb collaboration, R. Aaij, B. Adeva +673

A search for associated production of a $Z$ boson with an open charm meson is presented using a data sample, corresponding to an integrated luminosity of $1.0 fb^{- ‘}$ of…

hep-ex2019

Search for the rare decay $B^{+} \to I^¼^{+} I^¼^{-} I^¼^{+} I^½_{I^¼}$

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +844

A search for the rare leptonic decay $B^{+} \to I^¼^{+} I^¼^{-} I^¼^{+} I^½_{I^¼}$ is performed using proton-proton collision data corresponding to an integrated luminosity of $4.7…

Observation of charmonium pairs produced exclusively in $pp$ collisions

R. Aaij, B. Adeva, M. Adinolfi +700

A search is performed for the central exclusive production of pairs of charmonia produced in proton-proton collisions. Using data corresponding to an integrated luminosity of $3{\r…

Measurement of $C P$ asymmetries in $D^{\pm} \to I^\cdot^{'} I ¨ ^{\pm}$ and $D_{s}^{\pm} \to I^\cdot^{'} I ¨ ^{\pm}$ decays

LHCb collaboration, R. Aaij, B. Adeva +770

A search for $C P$ violation in $D^{\pm} \to I^\cdot^{'} I ¨ ^{\pm}$ and $D_{s}^{\pm} \to I^\cdot^{'} I ¨ ^{\pm}$ decays is performed using proton-proton collision data, c…

LHCb Detector Performance

LHCb collaboration, R. Aaij, B. Adeva +702

The LHCb detector is a forward spectrometer at the Large Hadron Collider (LHC) at CERN. The experiment is designed for precision measurements of CP violation and rare decays of bea…

Measurements of $C P$ violation in the three-body phase space of charmless $B^{\pm}$ decays

LHCb collaboration, R. Aaij, B. Adeva +701

The charmless three-body decay modes $B^{\pm} \to K^{\pm} I ¨ ^{+} I ¨ ^{-}$ , $B^{\pm} \to K^{\pm} K^{+} K^{-}$ , $B^{\pm} \to I ¨ ^{\pm} K^{+} K^{-}$ and $B^{\pm}…

hep-ex2011

First observation of Bs -> D_{s2}^{*+} X mu nu decays

LHCb Collaboration, R. Aaij, B. Adeva +586

Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays Bs -> Ds+ X mu nu and Bs -> D0 K+ X mu nu are d…

First observation of $B^{+} \to D_{s}^{+} K^{+} K^{-}$ decays and a search for $B^{+} \to D_{s}^{+} I ¨ $ decays

LHCb collaboration, R. Aaij, B. Adeva +797

A search for $B^{+} \to D_{s}^{+} K^{+} K^{-}$ decays is performed using $pp$ collision data corresponding to an integrated luminosity of 4.8 fb $^{- 1}$ , collected at centre-of-mass ene…

Search for the lepton number violating decays $B^{+} \to I ¨ ^{-} I^¼^{+} I^¼^{+}$ and $B^{+} \to K^{-} I^¼^{+} I^¼^{+}$

The LHCb Collaboration, R. Aaij, C. Abellan Beteta +578

A search is performed for the lepton number violating decay $B^{+} \to h^{-} I^¼^{+} I^¼^{+}$ , where $h^{-}$ represents a $K^{-}$ or a $I ¨ ^{-}$ , using data from the LHCb detector corresponding to…

Measurement of the flavour-specific CP-violating asymmetry $a_{sl}^{s}$ in $B_{s}^{0}$ decays

LHCb collaboration, R. Aaij, B. Adeva +655

The CP-violating asymmetry a_{sl}^s is studied using semileptonic decays of Bs and anti-Bs mesons produced in pp collisions at a centre-of-mass energy of 7 TeV at the LHC, exploiti…

Observation of the decay B0 -> D0bar K+ K- and evidence for Bs -> D0bar K+ K-

LHCb collaboration, R. Aaij, C. Abellan Beteta +621

The first observation of the decay B0 -> D0bar K+ K- is reported from an analysis of 0.62 fb-1 of pp collision data collected with the LHCb detector. Its branching fraction is meas…

Search for massive long-lived particles decaying semileptonically in the LHCb detector

LHCb collaboration, R. Aaij, B. Adeva +767

A search is presented for massive long-lived particles decaying into a muon and two quarks. The dataset consists of proton-proton interactions at centre-of-mass energies of 7 and 8…

Measurement of the time-dependent CP asymmetries in $B_{s}^{0} \to J / I ¨ K_{S}^{0}$

LHCb collaboration, R. Aaij, B. Adeva +699

The first measurement of decay-time-dependent CP asymmetries in the decay $B_{s}^{0} \to J / I ¨ K_{S}^{0}$ and an updated measurement of the ratio of branching fractions $\mathca…

Measurements of the branching fractions of $I^_{c}^{+} \to p I ¨ ^{-} I ¨ ^{+}$ , $I^_{c}^{+} \to p K^{-} K^{+}$ , and $I^_{c}^{+} \to p I ¨ ^{-} K^{+}$

LHCb collaboration, R. Aaij, B. Adeva +804

The ratios of the branching fractions of the decays $I^_{c}^{+} \to p I ¨ ^{-} I ¨ ^{+}$ , $I^_{c}^{+} \to p K^{-} K^{+}$ , and $I^_{c}^{+} \to p I ¨ ^{-} K^{+}$ wi…

First observation of a baryonic $B_{s}^{0}$ decay

LHCb collaboration, R. Aaij, B. Adeva +776

We report the first observation of a baryonic $B_{s}^{0}$ decay, $B_{s}^{0} \to p I^ K^{-}$ , using proton-proton collision data recorded by the LHCb experim…