Publications (164)
Constraints on the branching fraction
LHCb collaboration, R. Aaij, C. Abellán Beteta +901
A search for the decay is performed using proton-proton collision data, corresponding to an integrated luminosity of …
Test of lepton universality with decays
LHCb collaboration, R. Aaij, C. Abellán Beteta +904
The ratio of branching fractions of the decays and , , is measured for the first time using proton-p…
Search for decays
LHCb collaboration, R. Aaij, C. Abellán Beteta +905
Searches are performed for both prompt-like and long-lived dark photons, , produced in proton-proton collisions at a center-of-mass energy of 13 TeV. These searches look for $A…
Search for the lepton flavour violating decay using decays
LHCb collaboration, R. Aaij, C. Abellán Beteta +904
A search is presented for the lepton flavour violating decay using a sample of proton--proton collisions at centre-of-mass energies of 7, 8, and 13…
Observation of the decay
LHCb collaboration, R. Aaij, B. Adeva +808
The first observation of the decay is reported, together with the most precise branching fraction measurement of the mode $B^0 \to \overline{D}^0…
Evidence for the decay
LHCb collaboration, R. Aaij, B. Adeva +788
A search for the decay is presented using data sets corresponding to 1.0, 2.0 and 1.6 of integrated luminosity co…
Observation of meson decays to and final states
LHCb collaboration, R. Aaij, B. Adeva +801
The first observation of the and decays is reported using a sample of proton-proton collisions collected by LHCb at a center-of-…
Measurement of -averaged observables in the decay
LHCb collaboration, R. Aaij, C. Abellán Beteta +902
An angular analysis of the decay is presented using a data set corresponding to an integrated luminosity of 4.7 fb of…
Observation of a new baryon state in the mass spectrum
LHCb collaboration, R. Aaij, C. Abellán Beteta +905
A new baryon state is observed in the mass spectrum with high significance using a data sample of collisions, collected with the LHCb detector at centre-of-ma…
Observation of a new resonance
R. Aaij, B. Adeva, M. Adinolfi +806
From samples of collision data collected by the LHCb experiment at , and TeV corresponding to integrated luminosities of 1.0, 2.0 and 1.5 fb, respe…
Observation of several sources of violation in decays
LHCb collaboration, R. Aaij, C. Abellán Beteta +868
Observations are reported of different sources of violation from an amplitude analysis of decays, based on a data sample corresponding to an integrate…
Measurement of forward top pair production in the dilepton channel in collisions at TeV
LHCb collaboration, R. Aaij, B. Adeva +791
Forward top quark pair production is studied in collisions in the final state using a data sample corresponding to an integrated luminosity of 1.93 fb collected…
Observation of the decay in the mass region
LHCb collaboration, R. Aaij, B. Adeva +828
The decay mode is observed and its branching fraction relative to the corresponding decay mode, in a $\pm 15 \textrm{MeV}/…
Observation of the decays and
LHCb collaboration, R. Aaij, B. Adeva +776
The first observation of the decays and is reported using a data sample corresponding to an integrated luminosity of fb$…
Search for the lepton-flavour violating decays
LHCb collaboration, R. Aaij, B. Adeva +799
A search for the lepton-flavour violating decays and is performed based on a sample of proton-proton collision data…
Measurement of the baryon lifetime
LHCb collaboration, R. Aaij, B. Adeva +834
We report a measurement of the lifetime of the baryon using proton-proton collision data at center-of-mass energies of 7 and 8~TeV, corresponding to an integrated luminosi…
Silicon photomultiplier arrays - a novel photon detector for a high resolution tracker produced at FBK-irst, Italy
R. Greim, H. Gast, T. Kirn +8
A silicon photomultiplier (SiPM) array has been developed at FBK-irst having 32 channels and a dimension of 8.0 x 1.1 mm^2. Each 250 um wide channel is subdivided into 5 x 22 recta…
Determination of quantum numbers for several excited charmed mesons observed in decays
LHCb collaboration, R. Aaij, C. Abellán Beteta +907
A four-body amplitude analysis of the decay is performed, where fractions and relative phases of the various resonances contributing to the decay are mea…
Search for the rare decay
LHCb collaboration, R. Aaij, B. Adeva +792
A search for the flavor-changing neutral-current decay is reported using a data set corresponding to an integrated luminosity of collect…
Evidence for the rare decay
LHCb collaboration, R. Aaij, B. Adeva +791
A search for the rare decay is performed using collision data recorded by the LHCb experiment at centre-of-mass energies and TeV, cor…
Measurement of the polarizations in collisions at =7 and 8TeV
LHCb collaboration, R. Aaij, B. Adeva +801
The polarization of the , and mesons, produced in collisions at centre-of-mass energies =7 and 8TeV, is measured using data samples collect…
Search for dark photons produced in 13 TeV collisions
LHCb collaboration, R. Aaij, B. Adeva +796
Searches are performed for both prompt-like and long-lived dark photons, , produced in proton-proton collisions at a center-of-mass energy of 13 TeV, using $A^{\prime}\…
Measurement of the production cross-section in pp collisions at 7 and 13 TeV
LHCb collaboration, R. Aaij, B. Adeva +796
The production of mesons is studied in collisions at centre-of-mass energies of 7 and 13 TeV, using decays and data samples correspo…
Search for the decays and
LHCb collaboration, R. Aaij, B. Adeva +775
A search for the rare decays and is performed using proton--proton collision data collected with the LHCb detector. The data sample corresponds…
Measurement of production in collisions at TeV
LHCb collaboration, R. Aaij, C. Abellán Beteta +900
The production of baryons in proton-proton collisions at a centre-of-mass energy of TeV is measured in the transverse-momentum range $4<p_\mathr…
Observation of the decay
LHCb collaboration, R. Aaij, C. Abellán Beteta +903
Using proton-proton collision data, collected with the LHCb detector and corresponding to 1.0, 2.0 and 1.9fb of integrated luminosity at the centre-of-mass energies of 7, 8,…
Measurement of the lifetime of the doubly charmed baryon
LHCb collaboration, R. Aaij, B. Adeva +832
The first measurement of the lifetime of the doubly charmed baryon is presented, with the signal reconstructed in the final state . The data sa…
Measurement of and meson lifetimes
LHCb collaboration, R. Aaij, B. Adeva +774
We report on a measurement of the flavor-specific lifetime and of the lifetime using proton-proton collisions at center-of-mass energies of 7 and 8 TeV, col…
Search for decays to two charm mesons
LHCb collaboration, R. Aaij, B. Adeva +791
A search for decays of mesons to two charm mesons is performed for the first time using data corresponding to an integrated luminosity of 3.0 fb, collected by the LH…
First observation of the radiative decay
LHCb Collaboration, R. Aaij, C. Abellán Beteta +848
The radiative decay is observed for the first time using a data sample of proton-proton collisions corresponding to an integrated luminosity of …
Search for violation in decays using model-independent techniques
LHCb collaboration, R. Aaij, C. Abellán Beteta +950
A first search for violation in the Cabibbo-suppressed 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. Abellán Beteta +910
The single electron track-reconstruction efficiency is calibrated using a sample corresponding to of collision data recorded with the LHCb detector in 20…
Measurement of violation in decays
LHCb collaboration, R. Aaij, B. Adeva +786
A measurement of the asymmetries and in decays is reported. The decays are reconstructed in a dataset collected with the LHCb ex…
Test of lepton universality with decays
LHCb collaboration, R. Aaij, B. Adeva +785
A test of lepton universality, performed by measuring the ratio of the branching fractions of the and de…
Study of the decay with an amplitude analysis of decays
LHCb collaboration, R. Aaij, C. Abellán Beteta +840
An amplitude analysis of decays is performed in the two-body invariant mass regions MeV/, accounting for the ,…
Observation of a narrow pentaquark state, , and of two-peak structure of the
LHCb collaboration, R. Aaij, C. Abellán Beteta +866
A narrow pentaquark state, , decaying to is discovered with a statistical significance of in a data sample of decays which is a…
First measurement of the -violating phase in decays
LHCb collaboration, R. Aaij, B. Adeva +793
A flavour-tagged decay-time-dependent amplitude analysis of decays is presented in the mass range from 750 to 1600 MeV. The ana…
Search for CP violation using triple product asymmetries in , and decays
LHCb collaboration, R. Aaij, B. Adeva +791
A search for P and violation using triple-product asymmetries is performed with , and $Î^{0}_{b}\to pK^{-…
Measurement of the mass difference between neutral charm-meson eigenstates
LHCb Collaboration, R. Aaij, C. Abellán Beteta +842
We report a measurement of the mass difference between neutral charm-meson eigenstates using a novel approach that enhances sensitivity to this parameter. We use $…
Amplitude analysis of the decays and measurement of the branching fraction of the decay
LHCb Collaboration, R. Aaij, C. Abellán Beteta +844
The and decays are studied using proton-proton collision data corresponding to an integrated luminosity of 3…
Amplitude analysis of the decay
LHCb collaboration, R. Aaij, C. Abellán Beteta +868
The results of an amplitude analysis of the charmless three-body decay , in which -violation effects are taken into account, are reported. The a…
Model-independent observation of exotic contributions to decays
LHCb collaboration, R. Aaij, C. Abellán Beteta +841
An angular analysis of decays is performed, using proton-proton collision data corresponding to an integrated luminosity of 3~ collected with th…
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 and mesons is studied with beams of p…
Search for the rare decays and
LHCb collaboration, R. Aaij, C. Abellán Beteta +902
A search for the decays and is performed using data collected with the LHCb experiment in proton-proton collisions at center-of-mass energies of $…
Measurement of branching fractions of charmless four-body and decays
LHCb collaboration, R. Aaij, B. Adeva +794
A search for charmless four-body decays of and baryons with a proton and three charged mesons (either kaons or pions) in the final state is performed. The…
A search for weakly decaying b-flavored pentaquarks
LHCb collaboration, R. Aaij, B. Adeva +790
Investigations of the existence of pentaquark states containing a single (anti)quark decaying weakly into four specific final states J/, J/, J/$ÏK^-…
First observation of excited states
LHCb collaboration, R. Aaij, C. Abellán Beteta +901
We report four narrow peaks in the mass spectrum obtained using collisions at center-of-mass energies of 7, 8 and 13 TeV, corresponding to a total integrated lumin…
Amplitude analysis of the decay and first observation of the CP asymmetry in
LHCb collaboration, R. Aaij, B. Adeva +794
The time-integrated Dalitz plot of the three-body hadronic charmless decay is studied using a collision da…
Test of Lepton Flavor Universality by the measurement of the branching fraction using three-prong decays
LHCb collaboration, R. Aaij, B. Adeva +806
The ratio of branching fractions is measured using a data sample of proton-proton…
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…
Measurement of CP violation in the decay and search for the decay
LHCb collaboration, R. Aaij, C. Abellán Beteta +868
A measurement of the time-dependent CP-violating asymmetry in decays is presented. Using a sample of proton-proton collision data corresponding to an integra…
Measurement of the inelastic cross-section at a centre-of-mass energy of 13\,TeV
LHCb collaboration, R. Aaij, B. Adeva +782
The cross-section for inelastic proton-proton collisions at a centre-of-mass energy of 13\,TeV is measured with the LHCb detector. The fiducial cross-section for inelastic interact…
Study of charmonium production in -hadron decays and first evidence for the decay
LHCb collaboration, R. Aaij, B. Adeva +769
Using decays to -meson pairs, the inclusive production of charmonium states in -hadron decays is studied with collision data corresponding to an integrated luminosity o…
Observation of two resonances in the systems and precise measurement of and properties
LHCb collaboration, R. Aaij, C. Abellán Beteta +837
The first observation of two structures consistent with resonances in the final states and is reported using samples of collision data collected by…
Measurement of the time-integrated asymmetry in decays
LHCb collaboration, R. Aaij, B. Adeva +809
A measurement of the time-integrated asymmetry in decays is reported. The data correspond to an integrated luminosity of about fb colle…
Measurement of the branching fraction and effective lifetime and search for decays
LHCb collaboration, R. Aaij, B. Adeva +771
A search for the rare decays and is performed at the LHCb experiment using data collected in collisions corresponding to a total integrated…
A search for decays
LHCb Collaboration, R. Aaij, C. Abellán Beteta +848
A search for the baryon through the decay is performed with a data sample corresponding to an integrated lumino…
Measurements of asymmetries in charmless four-body and decays
LHCb collaboration, R. Aaij, C. Abellán Beteta +841
A search for violation in charmless four-body decays of and baryons with a proton and three charged mesons in the final state is performed. To cancel out produ…
Search for violation through an amplitude analysis of decays
LHCb collaboration, R. Aaij, C. Abellán Beteta +845
A search for violation in the Cabibbo-suppressed decay mode is performed using an amplitude analysis. The measurement uses a sample of …
Measurement of production in proton-proton collisions at TeV
LHCb collaboration, R. Aaij, B. Adeva +821
A measurement of production cross-section is presented using data, corresponding to an integrated luminosity of 2 fb, from collisions at $\sqrt{s…
Observation of an excited state
LHCb collaboration, R. Aaij, C. Abellán Beteta +848
Using collision data corresponding to an integrated luminosity of recorded by the LHCb experiment at centre-of-mass energies of , and…
Study of 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…
Search for the doubly charmed baryon
LHCb collaboration, R. Aaij, C. Abelán Beteta +905
A search for the doubly charmed baryon is performed through its decay to the final state, using proton-proton collision data collected with the LHCb…
Measurement of the branching fraction and asymmetry in decays
LHCb collaboration, R. Aaij, C. Abellán Beteta +844
The branching fraction and direct asymmetry of the decay are measured using proton-proton collision data collected with the LHCb detector at ce…
Measurement of production asymmetry in collisions at and 8 TeV
R. Aaij, B. Adeva, M. Adinolfi +786
The inclusive production asymmetry is measured in collisions collected by the LHCb experiment at centre-of-mass energies of and 8 TeV. Promptly produ…
Amplitude analysis of decays
LHCb Collaboration, R. Aaij, C. Abellán Beteta +843
The first untagged decay-time-integrated amplitude analysis of decays is performed using a sample corresponding to $3.0\,…
Observation of charmless baryonic decays
LHCb collaboration, R. Aaij, B. Adeva +770
Decays of and mesons to the charmless baryonic final states , where and each denote a kaon or a pion, are searched fo…
First observation of the doubly charmed baryon decay
LHCb collaboration, R. Aaij, B. Adeva +834
The doubly charmed baryon decay is observed for the first time, with a statistical significance of , confirming a recent observa…
Measurement of antiproton production in collisions at GeV
LHCb collaboration, R. Aaij, C. Abellán Beteta +839
The cross-section for prompt antiproton production in collisions of protons with an energy of TeV incident on helium nuclei at rest is measured with the LHCb experiment from…
Measurement of violation in decays
LHCb collaboration, R. Aaij, C. Abellán Beteta +901
The decay-time-dependent asymmetry in decays is measured using a data set corresponding to an integrated luminosity of fb recorded by the L…
Improved limit on the branching fraction of the rare decay
LHCb collaboration, R. Aaij, B. Adeva +767
A search for the decay is performed, based on a data sample of proton-proton collisions corresponding to an integrated luminosity of 3 fb$^{…
Measurement of asymmetries in two-body -meson decays to charged pions and kaons
LHCb collaboration, R. Aaij, B. Adeva +786
The time-dependent asymmetries in and decays are measured using a data sample of collisions corresponding to an integrated luminosi…
Measurement of charged hadron production in -tagged jets in proton-proton collisions at TeV
LHCb Collaboration, R. Aaij, C. Abellán Beteta +851
The production of charged hadrons within jets recoiling against a boson is measured in proton-proton collision data at TeV recorded by the LHCb experiment. The cha…
Measurement of -violating and mixing-induced observables in decays
LHCb collaboration, R. Aaij, C. Abellán Beteta +859
A time-dependent analysis of the decay rate is performed to determine the -violating observables and , and the mixing-induced observable $…
Measurement of variation with proton-proton collision energy and -meson kinematics
LHCb collaboration, R. Aaij, C. Abellán Beteta +903
The ratio of the and fragmentation fractions and is studied with and $B^+\to\mathrm…
Precision measurement of the , and baryon lifetimes
LHCb collaboration, R. Aaij, C. Abellán Beteta +847
We report measurements of the lifetimes of the , and charm baryons using proton-proton collision data at center-of-mass energies of 7 and 8\tev, correspon…
Measurement of observables in the process with two- and four-body decays
LHCb collaboration, R. Aaij, C. Abellán Beteta +876
Measurements of observables in decays are presented, where represents a superposition of and states. The meson is reconstructed i…
Measurement of b-hadron fractions in 13 TeV pp collisions
LHCb Collaboration, R. Aaij, C. Abellán Beteta +843
The production fractions of and hadrons, normalized to the sum of and fractions, are measured in 13 TeV pp collisions using data…
Resonances and violation in and decays in the mass region above the
LHCb collaboration, R. Aaij, B. Adeva +770
The decays of and mesons into the final state are studied in the mass region above the meson in order to determine the r…
Near-threshold spectroscopy and observation of a new charmonium state
LHCb Collaboration, R. Aaij, C. Abellán Beteta +846
Using proton-proton collision data, corresponding to an integrated luminosity of 9, collected with the~LHCb detector between 2011 and 2018, a new narrow charmonium state,…
Evidence for an resonance in decays
LHCb collaboration, R. Aaij, C. Abellán Beteta +842
A Dalitz plot analysis of decays is performed using data samples of collisions collected with the LHCb detector at centre-of-mass energies of $\sqrt…
Measurement of the angular distribution and the polarisation in collisions
LHCb collaboration, R. Aaij, C. Abellán Beteta +912
This paper presents an analysis of the angular distribution and the transverse production polarisation of baryons in proton-proton collisions at…
Observation of decays and precision measurements of the masses
LHCb Collaboration, R. Aaij, C. Abellán Beteta +843
The first observation of the decays is reported, using proton-proton collision data corresponding to an integrated luminosity of $5.2{\text{\,fb}…
A measurement of the asymmetry difference in and decays
LHCb collaboration, R. Aaij, B. Adeva +791
The difference between the asymmetries in the decays and is presented. Proton-proton collision data…
Updated branching fraction measurements of decays
LHCb collaboration, R. Aaij, B. Adeva +776
The charmless three-body decays (where ) are analysed using a sample of collision da…
Precision measurement of the meson mass
LHCb collaboration, R. Aaij, C. Abellán Beteta +905
A precision measurement of the meson mass is performed using proton-proton collision data collected with the LHCb experiment at centre-of-mass energies of and $1…
Search for violation in , and decays
LHCb collaboration, R. Aaij, C. Abellán Beteta +848
A search for charge-parity () violation in Cabibbo-suppressed , and decays is reported using proton-proton collision dat…
Measurement of asymmetry in decays
LHCb collaboration, R. Aaij, B. Adeva +790
We report the measurements of the -violating parameters in decays observed in collisions, using a data set corresponding to an integrated lum…
Measurement of the violation parameter in and decays
LHCb collaboration, R. Aaij, B. Adeva +769
Asymmetries in the time-dependent rates of and decays are measured in a collision data sample collected with the LHCb detector during LHC R…
Measurement of the production cross-section in collisions at TeV
LHCb collaboration, R. Aaij, C. Abellán Beteta +913
Using a data sample corresponding to an integrated luminosity of , collected by the LHCb experiment, the production of the state in proton-proton collision…
Measurement of angular and CP asymmetries in and decays
LHCb collaboration, R. Aaij, B. Adeva +832
The first measurements of the forward-backward asymmetry of the dimuon pair (), the triple-product asymmetry (), and the charge-parity-conjugation asymmetry ($A_{C…
First observation of forward production in collisions at TeV
LHCb collaboration, R. Aaij, B. Adeva +804
The decay is reconstructed in collision data, corresponding to 2 fb of integrated luminosity, collected by the LHCb experiment at a centre-of-…
Search for beautiful tetraquarks in the invariant-mass spectrum
LHCb collaboration, R. Aaij, B. Adeva +836
The invariant-mass distribution is investigated for a possible exotic meson state composed of two quarks and two quarks, $X_{b\overline{b}b\over…
A high resolution scintillating fiber tracker with SiPM readout for the PEBS experiment
H. Gast, R. Greim, T. Kirn +2
Using thin scintillating fibers with Silicon Photomultiplier (SiPM) readout a mo dular high-resolution charged-particle tracking detector has been designed. The fiber modules consi…
Amplitude analysis of decays
LHCb Collaboration, R. Aaij, C. Abellán Beteta +842
The first amplitude analysis of the decay is reported based on a data sample corresponding to an integrated luminosity of 3.0 fb of collision…
Study of production in jets
LHCb collaboration, R. Aaij, B. Adeva +774
The production of mesons in jets is studied in the forward region of proton-proton collisions using data collected with the LHCb detector at a center-of-mass energy of 13 Te…
Observation of new baryons decaying to
LHCb collaboration, R. Aaij, C. Abellán Beteta +906
The mass spectrum is studied with a data sample of collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb colle…
Search for violation in and decays
LHCb collaboration, R. Aaij, B. Adeva +834
A search for violation in and decays is presented using a sample of collisions collected with the LHCb detector and corresponding…
Updated determination of - mixing and CP violation parameters with decays
LHCb collaboration, R. Aaij, B. Adeva +792
We report measurements of charm-mixing parameters based on the decay-time-dependent ratio of to rates. The analysis uses a data sample of proton-p…
Observation of five new narrow states decaying to
LHCb collaboration, R. Aaij, B. Adeva +772
The mass spectrum is studied with a sample of collision data corresponding to an integrated luminosity of 3.3 fb, collected by the LHCb experiment. The $Î…