F. Ronchetti

Analysis of $I^_{b}^{0} \to p K^{-} I^¼^{+} I^¼^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1117

The differential branching fraction and angular coefficients of $I^_{b}^{0} \to p K^{-} I^¼^{+} I^¼^{-}$ decays are measured in bins of the dimuon mass squared and dihadron ma…

Observation of the $B_{c}^{+} \to J / I ¨ I ¨ ^{+} I ¨ ^{0}$ decay

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1068

The first observation of the $B_{c}^{+} \to J / I ¨ I ¨ ^{+} I ¨ ^{0}$ decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of 9fb…

Search for $B_{(s)}^{* 0} \to I^¼^{+} I^¼^{-}$ in $B_{c}^{+} \to I ¨ ^{+} I^¼^{+} I^¼^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1116

A search for the very rare $B^{* 0} \to I^¼^{+} I^¼^{-}$ and $B_{s}^{* 0} \to I^¼^{+} I^¼^{-}$ decays is conducted by analysing the $B_{c}^{+} \to I ¨ ^{+} I^¼^{+} I^¼^{-}$ process. The analysis uses proton-proton col…

Measurement of $J / I ¨ $ -pair production in $pp$ collisions at $s = 13$ TeV and study of gluon transverse-momentum dependent PDFs

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

The production cross-section of $J / I ¨ $ pairs in proton-proton collisions at a centre-of-mass energy of $s = 13$ TeV is measured using a data sample corresponding to an integra…

Study of light-meson resonances decaying to $K_{S}^{0} K I ¨ $ in the $B \to (K_{S}^{0} K I ¨ ) K$ channels

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1132

A study is presented of $B^{+} \to K_{S}^{0} K^{-} I ¨ ^{+} K^{-}$ and $B^{+} \to K_{S}^{0} K^{+} I ¨ ^{-} K^{+}$ decays based on the analysis of proton-proton collision data collected with the LH…

Study of the rare decay $J / I ¨ \to I^¼^{+} I^¼^{-} I^¼^{+} I^¼^{-}$

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1099

The rare electromagnetic $J / I ¨ \to I^¼^{+} I^¼^{-} I^¼^{+} I^¼^{-}$ decay is observed with a significance greatly exceeding the discovery threshold, using proton-proton collision data collected by…

Observation of exotic $J / I ¨ I ¨ $ resonant structure in diffractive processes in proton-proton collisions

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1072

The first study of $J / I ¨ I ¨ $ production in diffractive processes in proton-proton collisions is presented. The study is based on an LHCb dataset recorded at centre-of-mass energy of…

nucl-ex2016

INFN What Next: Ultra-relativistic Heavy-Ion Collisions

A. Dainese, E. Scomparin, G. Usai +138

This document was prepared by the community that is active in Italy, within INFN (Istituto Nazionale di Fisica Nucleare), in the field of ultra-relativistic heavy-ion collisions. T…

Improved measurement of $I^\cdot / I^\cdot^{'}$ mixing in $B_{(s)}^{0} \to J / I ¨ I^\cdot^{(')}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1182

Branching fraction ratios between the decays $B_{(s)}^{0} \to J / I ¨ I^\cdot^{(')}$ are measured using proton-proton collision data collected by the LHCb experiment at centre-…

nucl-ex2025

Production of $I^\cdot$ and $I^\cdot^{'}$ mesons in $pp$ and $p$ Pb collisions

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

The production of $I^\cdot$ and $I^\cdot^{'}$ mesons is studied in proton-proton and proton-lead collisions collected with the LHCb detector. Proton-proton collisions are studied at center-of-m…

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

LHCb collaboration, R. Aaij, M. Abdelfatah +1119

A measurement of the CKM angle $γ$ using the decay channels $B^{\pm} \to D K^{\pm}$ and $B^{\pm} \to D π^{\pm}$ , where the $D$ meson decays to $D\rightarrow K_{\rm S}^{…

Observation of charge-parity symmetry breaking in baryon decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1136

The Standard Model of particle physics-the theory of particles and interactions at the smallest scale-predicts that matter and antimatter interact differently due to violation of t…

Observation of the $I^_{b}^{0} \to J / I ¨ I^^{-} K^{+}$ and $I^_{b}^{0} \to J / I ¨ I^^{-} I ¨ ^{+}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1131

The first observation of the $I^_{b}^{0} \to J / I ¨ I^^{-} I ¨ ^{+}$ decay and the most precise measurement of the branching fraction of the $I^_{b}^{0} \to J / I ¨ I^^{-} K^{+}$ decay are reported, using…

Precision measurement of the muon charge asymmetry from $W$ -boson decays in $pp$ collisions at $s$ = 13 TeV in the forward region

LHCb collaboration, R. Aaij, M. Abdelfatah +1114

A precision measurement of the muon charge asymmetry from $W$ -boson decays in proton-proton collisions at $s$ = 13 TeV is presented. The analysis utilizes data corresponding…

Measurement of $D^{0} - D^{0}$ mixing and search for $C P$ violation with $D^{0} \to K^{+} I ¨ ^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1073

A measurement of the time-dependent ratio of the $D^{0} \to K^{+} I ¨ ^{-}$ to $D^{0} \to K^{+} I ¨ ^{-}$ decay rates is reported. The analysis uses a sample of proton-proto…

Prompt and nonprompt $I ¨ (2 S)$ production in $p$ Pb collisions at $s_{N N} = 8.16$ TeV

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

The production of $I ¨ (2 S)$ mesons in proton-lead collisions at a centre-of-mass energy per nucleon pair of $s_{N N} = 8.16$ TeV is studied with the LHCb detector using data cor…

First observation of $C P$ violation and measurement of polarization in $B^{+} \to I ¨ (770)^{0} K^{*} (892)^{+}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1183

An amplitude analysis of the $B^{+} \to (I ¨ ^{+} I ¨ ^{-}) (K_{S}^{0} I ¨ ^{+})$ decay is performed in the mass regions $0.30 < m_{I ¨ ^{+} I ¨ ^{-}} < 1.10 GeV / c^{2}$ and $0.75 < m_{K^0_{\mat…

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 +1128

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

Search for heavy neutral leptons in B-meson decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1184

A search for long-lived heavy neutral leptons produced in B-meson decays and decaying to a $I^¼^{\pm} I ¨ ^{\mp}$ final state is performed with data collected by the LHCb experiment in p…

Measurement of the $Z$ boson production cross-section in $pp$ collisions at $s = 5.02$ TeV

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

The first measurement of the $Z$ boson production cross-section at centre-of-mass energy $s = 5.02$ TeV in the forward region is reported, using $pp$ collision data collect…

Measurement of the $W \to I^¼ I^½_{I^} ¼$ cross-sections as a function of the muon transverse momentum in $pp$ collisions at 5.02 TeV

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1186

The $pp \to W^{\pm} (\to I^¼^{\pm} I^½_{I^} ¼) X$ cross-sections are measured at a proton-proton centre-of-mass energy $s = 5.02$ TeV using a dataset corresponding to an integrate…

nucl-th2002

Polarization observables in high-energy deuteron photodisintegration within the Quark-Gluon Strings Model

V. Yu. Grishina, L. A. Kondratyuk, W. Cassing +4

Deuteron two-body photodisintegration is analysed within the framework of the Quark-Gluon Strings Model. The model describes fairly well the recent experimental data from TJNAF in…

Measurement of $C P$ asymmetry in $D^{0} \to K_{S}^{0} K_{S}^{0}$ decays with Run 3 data

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1189

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

$C P$ violation analysis of local and nonlocal amplitudes in the $B^{0} \to K^{* 0} μ^{+} μ^{-}$ decay

LHCb collaboration, R. Aaij, M. Abdelfatah +1118

A search for $C P$ violation in the $B^{0} \to K^{* 0} μ^{+} μ^{-}$ decay is performed using proton-proton collision data collected by the LHCb experiment during Run…

nucl-ex2004

The CLAS Electromagnetic Calorimeter at Large Angles

M. Anghinolfi, H. Avakian, M. Battaglieri +16

The study of the response of the two modules of the large-angle electromagnetic shower calorimeter (LAC) of the CLAS detector to charged and neutral particles is reported. The resu…

Amplitude analysis of $B^{+} \to I ¨ (2 S) K^{+} I ¨ ^{+} I ¨ ^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1096

The first full amplitude analysis of $B^{+} \to I ¨ (2 S) K^{+} I ¨ ^{+} I ¨ ^{-}$ decays is performed using proton-proton collision data corresponding to an integrated luminosity of $9\,\text{fb…

Determination of short- and long-distance contributions in $B^{0} \to K^{* 0} I^¼^{+} I^¼^{-}$ decays

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. The analysis is based on data collected by the LHCb experiment from proton-proton collisions at $\sqrt{s}…

Measurement of the Lund plane for light- and beauty-quark jets

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1136

The substructure of jets in quantum chromodynamics (QCD) has garnered significant attention with the advent of infrared- and collinear-safe clustering algorithms and observables. A…

Updated measurement of $C P$ violation and polarisation in $B_{s}^{0} \to J / I ¨ K^{*} (892)^{0}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1169

A time-integrated angular analysis of the decay $B_{s}^{0} \to J / I ¨ K^{*} (892)^{0}$ , with $J / I ¨ \to I^¼^{+} I^¼^{-}$ and $\overline{K}{}^{*}\kern-1pt(…

Measurements of charmed meson and antimeson production asymmetries at $s = 13.6$ TeV

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1130

This article presents doubly differential measurements of the asymmetries in production rates between mesons containing a charm quark and those containing an anticharm quark in pro…

Measurement of the top-quark production cross-section and charge asymmetry at LHCb

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1173

The first measurements of the top- and antitop-quark differential production cross-sections and the top-quark charge asymmetry in the forward region are presented, using proton-pro…

physics.ins-det2022

A high-performance custom photodetection system to probe the light yield enhancement in oriented crystals

M. Soldani, L. Bandiera, L. Bomben +16

Scintillating homogeneous detectors represent the state of the art in electromagnetic calorimetry. Moreover, the currently neglected crystalline nature of the most common inorganic…

Measurement of the CKM angle $I^^{3}$ using the $B^{\pm} \to D^{*} h^{\pm}$ channels

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

A measurement of the $C P$ -violating observables from $B^{\pm} \to D^{*} K^{\pm}$ and $B^{\pm} \to D^{*} I ¨ ^{\pm}$ decays is presented, where $D^{*} (D)$ is an admixture of…

Measurement of the branching fraction ratios $R (D^{+})$ and $R (D^{*+})$ using muonic $I ¨ $ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1066

The branching fraction ratios of $B^{0} \to D^{+} I ¨ ^{-} I^½_{I ¨} $ and $B^{0} \to D^{*+} I ¨ ^{-} I^½_{I ¨} $ decays are measured with respect to their muonic counter…

Inclusive $B$ -meson flavour-tagging algorithm at LHCb

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1179

A new algorithm is developed to identify the flavour of neutral $B$ mesons at production in $pp$ collisions by utilising all tracks from the hadronisation process. The algorithm is…

Observation of new charmonium(-like) states in $B^{+} \to D^{*\pm} D^{\mp} K^{+}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1066

A study of resonant structures in $B^{+} \to D^{*+} D^{-} K^{+}$ and $B^{+} \to D^{*-} D^{+} K^{+}$ decays is performed, using proton-proton collision data at cen…

Measurement of the $D^{}$ longitudinal polarization in $B^{0} \to D^{-} I ¨ ^{+} I^½_{I ¨} $ decays

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

The longitudinal polarization fraction of the $D^{*}$ meson is measured in $B^{0} \to D^{*-} I ¨ ^{+} I^½_{I ¨} $ decays, where the $I ¨ $ lepton decays to three charged pions and a neutrino, us…

Machine learning techniques for jet reconstruction at LHCb and application to the search for $H \to b b ˉ$ and $H \to c c ˉ$ in $s = 13$ TeV $pp$ collisions

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1194

Two machine learning techniques for jet measurements at the LHCb experiment are presented: a regression-based method for jet-energy calibration and a deep neural network algorithm…

Observation of orbitally excited $B_{c}^{+}$ states

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1155

The observation of a wide peaking structure in the $B_{c}^{+} I^^{3}$ mass spectrum is reported using proton-proton collision data collected by the LHCb detector at center-of-mass ener…

First measurement of $b$ -jet mass with and without grooming

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1138

The LHCb collaboration presents a novel suite of heavy-flavour jet substructure measurements at forward rapidity in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}…

Improved measurement of $C P$ violation parameters in $B_{s}^{0} \to J / I ¨ K^{+} K^{-}$ decays in the vicinity of the $I ¨ (1020)$ resonance

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

The decay-time-dependent $C P$ asymmetry in $B_{s}^{0} \to J / I ¨ (\to I^¼^{+} I^¼^{-}) K^{+} K^{-}$ decays is measured using proton-proton collision data, corresponding to an integrated lumino…

nucl-ex2026

Measurement of transverse $I^$ and $I^ˉ $ hyperon polarization in $p$ Pb collisions at $s_{N N} = 5.02$ TeV

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1131

The transverse polarization of $I^$ and $I^ˉ $ hyperons is measured in $p$ Pb collisions collected by the LHCb experiment at a nucleon-nucleon center-of-mass energy of $5.02$ TeV.…

nucl-ex2026

Study of nuclear effects on charm production in light-ion collisions

LHCb collaboration, R. Aaij, M. Abdelfatah +1106

The onset of nuclear effects in light-ion collisions is studied by measuring the ratio of $D^{0}$ meson production between NeNe and OO collisions at a center-of-mass energy per nucle…

Three-pion Bose-Einstein correlations measured in proton-proton collisions

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1128

A study on the Bose-Einstein correlations for triplets of same-sign pions is presented. The analysis is performed using proton-proton collisions at a centre-of-mass energy of $\sqr…

Measurement of $C P$ violation observables in $D^{+} \to K^{-} K^{+} I ¨ ^{+}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1112

A search for violation of the charge-parity $C P$ symmetry in the $D^{+} \to K^{-} K^{+} I ¨ ^{+}$ decay is presented, with proton-proton collision data corresponding to an integrated…

Test of lepton flavour universality with $B^{+} \to K^{+} I ¨ ^{+} I ¨ ^{-} ℓ^{+} ℓ^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1132

The first test of lepton flavor universality between muons and electrons using $B^{+} \to K^{+} I ¨ ^{+} I ¨ ^{-} ℓ^{+} ℓ^{-}$ ( $ℓ = e, I^¼$ ) decays is presented. The measurement is performed wit…

Study of charmonium production via the decay to $p p ˉ$ at $s = 13 T e V$

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1063

Charmonium production cross-section in proton-proton collisions is measured at the centre-of-mass energy $s = 13 T e V$ using decays to $p p ˉ$ final state. The study is per…

First evidence of $C P$ violation in beauty baryon to charmonium decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1178

A study of the difference in the $C P$ asymmetries between $I^_{b}^{0} \to J / I ¨ p I ¨ ^{-}$ and $I^_{b}^{0} \to J / I ¨ p K^{-}$ decays, $I^ A_{C P}$ , is performed using proto…

physics.acc-ph2022

Crystal-based pair production for a lepton collider positron source

L. Bandiera, L. Bomben, R. Camattari +18

An intense positron sources is a demanding element in the design of future lepton colliders. A crystal-based hybrid positron source could be an alternative to a more conventional s…

Observation of the open-charm tetraquark candidate $T_{cs 0}^{*} (2870)^{0}$ in the $B^{-} \to D^{-} D^{0} K_{S}^{0}$ decay

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1133

An amplitude analysis of $B^{-} \to D^{-} D^{0} K_{S}^{0}$ decays is performed using proton-proton collision data, corresponding to an integrated luminosity of $9\,\text{fb}^…

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}_…

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

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1132

An angular analysis of the decay $B_{s}^{0} \to I ¨ e^{+} e^{-}$ is presented, using proton-proton collision data collected with the LHCb detector between 2011 and 2018 at centre-of-mass energi…

Search for the rare decay of charmed baryon $I^_{c}^{+}$ into $p I^¼^{+} I^¼^{-}$ final state

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1066

A search for the nonresonant $I^_{c}^{+} \to p I^¼^{+} I^¼^{-}$ decay is performed using proton-proton collision data recorded at a centre-of-mass energy of 13 TeV by the LHCb experiment, co…

First observation of the charmless baryonic decay $B^{+} \to I^ˉ p p ˉ p$

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1186

A search for the charmless baryonic decay $B^{+} \to I^ˉ p p ˉ p$ is performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated…

Study of the $B^{0} \to I^_{c}^{+} I^ˉ _{c}^{-} K_{S}^{0}$ decay

LHCb collaboration, R. Aaij, M. Abdelfatah +1113

The decay $B^{0} \to I^_{c}^{+} I^ˉ _{c}^{-} K_{S}^{0}$ is studied at LHCb for the first time using proton-proton collision data recorded by the LHCb experiment at a center-of-mass energy of $…

physics.ins-det2025

R&D on a high-performance electromagnetic calorimeter based on oriented crystalline scintillators

M. Soldani, N. Argiolas, L. Bandiera +36

Although inorganic scintillators are widely used in the design of electromagnetic calorimeters for high-energy physics and astrophysics, their crystalline nature and, hence, their…

Measurement of $C P$ asymmetry in $B_{s}^{0} \to D_{s}^{\mp} K^{\pm}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1119

A measurement of the $C P$ -violating parameters in $B_{s}^{0} \to D_{s}^{\mp} K^{\pm}$ decays is reported, based on the analysis of proton-proton collision data collected by the LHCb expe…

Study of $D_{s 1} (2460)^{+} \to D_{s}^{+} I ¨ ^{+} I ¨ ^{-}$ in $B \to D ˉ^{(*)} D_{s}^{+} I ¨ ^{+} I ¨ ^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1129

An amplitude analysis of the $D_{s 1} (2460)^{+} \to D_{s}^{+} I ¨ ^{+} I ¨ ^{-}$ transition is performed simultaneously in $B^{0} \to D^{-} D_{s}^{+} I ¨ ^{+} I ¨ ^{-}$ , $B^{+}\to{\bar{D}}^{0} D_{s}…

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…

Tracking of charged particles with nanosecond lifetimes at LHCb

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1063

A method is presented to reconstruct charged particles with lifetimes between 10 ps and 10 ns, which considers a combination of their decay products and the partial tracks created…

First evidence of the decay $B^{+} \to I ¨ ^{+} e^{+} e^{-}$

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1182

The first evidence for the decay $B^{+} \to I ¨ ^{+} e^{+} e^{-}$ is reported using proton-proton collision data recorded by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV,…

Observation of the doubly-charmed-baryon decay $I^_{cc}^{++} \to I^_{c}^{0} I ¨ ^{+} I ¨ ^{+}$

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1134

A search for the doubly-charmed-baryon decay $I^_{cc}^{++} \to I^_{c}^{0} I ¨ ^{+} I ¨ ^{+}$ is performed using proton-proton collision data collected by the LHCb experiment at…

Test of lepton flavour universality with $B^{0} \to K^{* 0} ℓ^{+} ℓ^{-}$ decays at large dilepton invariant mass

LHCb collaboration, R. Aaij, M. Abdelfatah +1115

Muon-electron universality is tested in $B^{0} \to K^{* 0} ℓ^{+} ℓ^{-}$ decays, in the dilepton-invariant-mass region above the $I ¨ (2 S)$ resonance. The analysis uses beauty mesons…

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

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1183

An analysis of the $B^{0} \to K^{* 0} (\to K^{+} I ¨ ^{-}) I^¼^{+} I^¼^{-}$ decay is presented using proton-proton collision data collected by the LHCb experiment, corresponding to an i…

Improved branching-fraction measurements of $B_{(s)}^{0} \to K_{S}^{0} h^{+} h^{^{'} -}$ decays and first observation of $B_{s}^{0} \to K_{S}^{0} K^{+} K^{-}$

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1123

This paper presents a study of the charmless three-body decays $B_{(s)}^{0} \to K_{S}^{0} h^{+} h^{' -}$ (where $h^{(')} = I ¨ , K$ ), using a sample of $pp$ collision…

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

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1176

A sample of $pp$ collision data, corresponding to an integrated luminosity of 5.4 fb $^{- 1}$ and collected by the LHCb experiment during LHC Run 2, is used to measure the ratio of t…

First determination of the spin-parity of $I^_{c} (3055)^{+, 0}$ baryons

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1112

The $I^_{b}^{0 (-)} \to I^_{c} (3055)^{+ (0)} (\to D^{+ (0)} I^) I ¨ ^{-}$ decay chains are observed, and the spin-parity of $I^_{c} (3055)^{+ (0)}$ baryons is determined for the first time.…

Searches for $B^{0} \to K^{+} I ¨ ^{-} I ¨ ^{+} I ¨ ^{-}$ and $B_{s}^{0} \to K^{+} K^{-} I ¨ ^{+} I ¨ ^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1185

The first searches for $B^{0} \to K^{+} I ¨ ^{-} I ¨ ^{+} I ¨ ^{-}$ and $B_{s}^{0} \to K^{+} K^{-} I ¨ ^{+} I ¨ ^{-}$ decays at the LHCb experiment are conducted with $pp$ collision data corresponding to an integrated lu…

A model-independent measurement of the CKM angle $I^^{3}$ in the decays $B^{\pm} \to [K^{+} K^{-} I ¨ ^{+} I ¨ ^{-}]_{D} h^{\pm}$ and $B^{\pm} \to [I ¨ ^{+} I ¨ ^{-} I ¨ ^{+} I ¨ ^{-}]_{D} h^{\pm}$ ( $h = K, I ¨ $ )

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1164

A model-independent determination of the CKM angle $I^^{3}$ is presented, using the $B^{\pm} \to [K^{+} K^{-} I ¨ ^{+} I ¨ ^{-}]_{D} h^{\pm}$ and $B^{\pm} \to [I ¨ ^{+} I ¨ ^{-} I ¨ ^{+} I ¨ ^{-}]_{D} h^{\pm}$ decays, with $h = K, I ¨ $ . T…

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…

hep-ex2023

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…

Measurement of $C P$ asymmetries in $I^_{b}^{0} \to p h^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1129

A search for $C P$ violation in $I^_{b}^{0} \to p K^{-}$ and $I^_{b}^{0} \to p I ¨ ^{-}$ decays is presented using the full Run 1 and Run 2 data samples of $pp$ collisions collected w…

Precision measurement of the $I^_{b}^{-}$ baryon lifetime

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1067

A sample of $pp$ collision data, corresponding to an integrated luminosity of 5.5 fb $^{- 1}$ and collected by the LHCb experiment during LHC Run 2, is used to measure the ratio of t…

A method for luminosity determination based on real-time hit reconstruction with the LHCb silicon pixel detector

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1177

The data acquisition system of the upgraded LHCb experiment includes the fast reconstruction of all hits in the vertex locator (VELO) pixel detector at the beam-crossing rate of 40…

Associated $Z$ + $J / I ¨ $ production as a probe of multiparton interactions in the forward region

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1187

This letter reports a study of associated $Z$ boson and prompt $J / I ¨ $ production in proton-proton collisions at $s = 13$ TeV with the LHCb detector in the forward rapidity reg…

Transverse polarization measurement of $I^$ hyperons in $p$ Ne collisions at $s_{N N}$ = 68.4 GeV with the $\mbox{LHCb}$ detector

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1068

A measurement of the transverse polarization of the $I^$ and $I^ˉ $ hyperons in $p$ Ne fixed-target collisions at $s_{N N}$ = 68.4 GeV is presented using data collected by t…

Differential measurement of the branching fraction and $C P$ asymmetry of the decay $B^{\pm} \to I ¨ ^{\pm} I^¼^{+} I^¼^{-}$

LHCb collaboration, R. Aaij, M. Abdelfatah +1121

Differential measurements of the branching fraction and $C P$ asymmetry of the decay $B^{\pm} \to I ¨ ^{\pm} I^¼^{+} I^¼^{-}$ are performed in intervals of the dimuon mass squared, $q^{2}$ , using…

physics.ins-det2021

First demonstration of in-beam performance of bent Monolithic Active Pixel Sensors

ALICE ITS project, :, G. Aglieri Rinella +250

A novel approach for designing the next generation of vertex detectors foresees to employ wafer-scale sensors that can be bent to truly cylindrical geometries after thinning them t…

New measurements of $B_{c}^{+}$ decays into single charm final states

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1147

Using proton-proton collision data corresponding to an integrated luminosity of $9 fb^{- 1}$ collected by the LHCb experiment, searches are performed for $B_{c}^{+}$ mesons d…

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…

Precision measurement of CP violation and branching fractions in $B^{\pm} \to K_{S}^{0} h^{\pm}$ $(h = I ¨ , K)$ decays and search for the rare decay $B_{c}^{\pm} \to K_{S}^{0} K^{\pm}$

R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta +1177

The decay $B^{\pm} \to K_{S}^{0} I ¨ ^{\pm}$ , with a $C P$ asymmetry expected to be close to zero in the Standard Model, is theoretically clean and sensitive to potential new p…

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 $B^{0} \to I ¨ (770)^{0} I^^{3}$ branching fraction

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1160

The ratio between the branching fractions of the $B^{0} \to I ¨ (770)^{0} I^^{3}$ and $B^{0} \to K^{*} (892)^{0} I^^{3}$ decays is measured with proton-proton collision data collect…

Measurement of the effective leptonic weak mixing angle

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1120

Using $pp$ collision data at $s = 13$ TeV, recorded by the LHCb experiment between 2016 and 2018 and corresponding to an integrated luminosity of $5.4$ fb $^{- 1}$ , the forward-…

Search for lepton-number-violating $B^{-} \to D^{(*) +} I^¼^{-} I^¼^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1188

A search is performed for lepton-number-violating $B^{-} \to D^{(*) +} I^¼^{-} I^¼^{-}$ decays, using data collected by the LHCb experiment in proton-proton collisions at a center-of-mass ener…

#average transverse momentum#charged particle production#pp collisions#pPb collisions

Search for resonance-enhanced $C P$ and angular asymmetries in the $I^_{c}^{+} \to p I^¼^{+} I^¼^{-}$ decay at LHCb

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1131

The first measurement of the $C P$ asymmetry of the decay rate ( $A_{C P}$ ) and the $C P$ average ( $I^£ A_{FB}$ ) and $C P$ asymmetry ( $I^ A_{FB}$ ) of the forward-backward asy…

nucl-ex2026

Measurement of the average transverse momentum of forward prompt charged particles in $pp$ and $p Pb$ collisions at $s_{N N} = 5.02 TeV$

LHCb collaboration, R. Aaij, M. Abdelfatah +1106

The paper reports the first measurements of the average transverse momentum of prompt charged particles in pp and pPb collisions at 5.02 TeV, studying its dependence on event multi…

Observation of the doubly charmed baryon $I^_{cc}^{+}$ with the LHCb Run 3 detector

LHCb collaboration, R. Aaij, M. Abdelfatah +1106

The first observation of the doubly charmed baryon $I^_{cc}^{+}$ is reported through its decay to the $I^_{c}^{+} K^{-} I ¨ ^{+}$ final state, with a statistical significance exceeding se…

nucl-ex2025

Coherent photoproduction of $I ¨ ^{0}, I ¨ $ and excited vector mesons in ultraperipheral PbPb collisions

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1132

The invariant-mass distribution for the coherent photoproduction of dipions in ultraperipheral PbPb collisions is measured using data, corresponding to an integrated luminosity of…

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…

Measurement of the branching fraction of the $I^_{b}^{0} \to J / I ¨ I^$ decay and isospin asymmetry of $B \to J / I ¨ K$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1193

This paper describes a measurement of the $I^_{b}^{0} \to J / I ¨ I^$ branching fraction using data collected with the LHCb experiment in proton-proton collisions from 2016 to 2018. The dat…

nucl-ex2025

Rapidity and multiplicity dependence of charged-particle flow in $p$ Pb collisions at $s_{N N} = 8.16$ TeV

R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta +1129

The elliptic and triangular flow of charged particles are measured using two-particle angular correlations in $p$ Pb collisions in the pseudorapidity range \cal{2.0 $< ∣ I^\cdot ∣ <$ 4.8}.…

Amplitude analysis of $B^{0} \to I^\cdot_{c} (1 S) K^{+} I ¨ ^{-}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1185

An amplitude analysis of the $B^{0} \to I^\cdot_{c} (1 S) K^{+} I ¨ ^{-}$ decays with $I^\cdot_{c} (1 S) \to p p ˉ$ is performed using a sample corresponding to an integrated luminosity of…

Evidence for $B^{-} \to D^{** 0} I ¨ ^{-} I^½_{I ¨} $ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1132

The first evidence for the decay $B^{-} \to D^{** 0} I ¨ ^{-} I^½_{I ¨} $ is obtained using proton-proton collision data collected by the LHCb experiment, corresponding to an i…

Deuteron identification via time of flight with LHCb

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1183

It is shown that the timing capabilities of the LHCb detector operated during the LHC Run 2 can be used to identify light ion particles with momenta of a few GeV/ $c$ . This is achie…

First evidence for direct CP violation in beauty to charmonium decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1131

The $C P$ asymmetry and branching fraction of the CKM-suppressed decay $B^{+} \to J / I ¨ I ¨ ^{+}$ are precisely measured relative to the favoured decay $B^+\!\to…

First observation of the $B_{s}^{0} \to I^_{c}^{+} I^_{c}^{-}$ decay and evidence for the $B^{0} \to I^_{c}^{+} I^_{c}^{-}$ decay

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1187

A search is presented for the two-body charmed baryonic decays $B_{(s)}^{0} \to I^_{c}^{+} I^_{c}^{-}$ , using a data sample collected by the LHCb experiment duri…

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…

Polarization measurement of $I^_{c}^{+}$ and $I^_{c}^{-}$ baryons in $p$ Ne collisions at $s_{N N} = 68.6$ GeV

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1174

The first measurement of the polarization of charm baryons by the LHCb experiment recorded in fixed-target mode is presented. The polarization of $I^_{c}$ baryons is studied in colli…