A5078784083- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Neutrino Physics Research
- Nuclear reactor physics and engineering
- Astrophysics and Cosmic Phenomena
- Nuclear physics research studies
- Radiation Detection and Scintillator Technologies
- Black Holes and Theoretical Physics
- Superconducting Materials and Applications
- Medical Imaging Techniques and Applications
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Particle Accelerators and Free-Electron Lasers
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Ionosphere and magnetosphere dynamics
- Markov Chains and Monte Carlo Methods
- Experimental and Theoretical Physics Studies
- Stochastic processes and statistical mechanics
- Statistical Methods and Bayesian Inference
- Millimeter-Wave Propagation and Modeling
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2019-2025
Yale University
2013-2024
Central China Normal University
2020
University of Chinese Academy of Sciences
2020
University of Milan
2020
Tsinghua University
2020
Peking University
2020
State Key Laboratory of Nuclear Physics and Technology
2020
Institute of High Energy Physics
2020
Chicago State University
2019
At sufficiently high temperature and energy density, nuclear matter undergoes a transition to phase in which quarks gluons are not confined: the Quark-Gluon Plasma (QGP) [1]. Such an extreme state of strongly-interacting QCD (Quantum Chromo-Dynamics) is produced laboratory with high-energy collisions heavy nuclei, where enhanced production strange hadrons observed [2-6]. Strangeness enhancement, originally proposed as signature QGP formation [7], more pronounced for multi-strange baryons....
In this Letter, comprehensive results on ${\rm\pi}^\pm$, K$^\pm$, K$^0_S$, p, $\rm\bar{p}$, $\rm \Lambda$ and \bar{\Lambda}$ production at mid-rapidity ($0 < y_{\rm cms} 0.5$) in p-Pb collisions $\sqrt{s_{\rm NN}} = 5.02$ TeV, measured by the ALICE detector LHC, are reported. The transverse momentum distributions exhibit a hardening as function of event multiplicity, which is stronger for heavier particles. This behavior similar to what has been observed pp Pb-Pb LHC. $p_{\rm T}$ compared...
Abstract The standard model of particle physics currently provides our best description fundamental particles and their interactions. theory predicts that the different charged leptons, electron, muon tau, have identical electroweak interaction strengths. Previous measurements shown a wide range decays are consistent with this principle lepton universality. This article presents evidence for breaking universality in beauty-quark decays, significance 3.1 deviations, based on proton–proton...
Using proton-proton collision data at centre-of-mass energies of $\sqrt{s} = 7$, $8$ and $13\mathrm{\,TeV}$ recorded by the LHCb experiment Large Hadron Collider, corresponding to an integrated luminosity $9\mathrm{\,fb}^{-1}$, invariant mass spectrum $J/ψ$ pairs is studied. A narrow structure around $6.9\mathrm{\,GeV/}c^2$ matching lineshape a resonance broad just above twice are observed. The deviation from nonresonant $J/ψ$-pair production five standard deviations in region between $6.2$...
ALICE (A Large Ion Collider Experiment) is studying the physics of strongly interacting matter, and in particular properties Quark–Gluon Plasma (QGP), using proton–proton, proton–nucleus nucleus–nucleus collisions at CERN LHC (Large Hadron Collider). The Collaboration preparing a major upgrade experimental apparatus, planned for installation second long shutdown years 2018–2019. A key element construction new, ultra-light, high-resolution Inner Tracking System (ITS) based on monolithic CMOS...
The ALICE measurement of K(S)(0) and Λ production at midrapidity in Pb-Pb collisions √(s(NN))=2.76 TeV is presented. transverse momentum (p(T)) spectra are shown for several collision centrality intervals the p(T) range from 0.4 GeV/c (0.6 Λ) to 12 GeV/c. dependence Λ/K(S)(0) ratios exhibits maxima vicinity 3 GeV/c, positions shift towards higher with increasing centrality. magnitude these increases by almost a factor three between most peripheral central collisions. This baryon excess...
Angular correlations between unidentified charged trigger particles and various species of associated (unidentified particles, pions, kaons, protons antiprotons) are measured by the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy 5.02 TeV transverse-momentum range $0.3 < p_{\rm T} 4$ GeV/$c$. The expressed as yield per particle obtained pseudorapidity $|\eta_{\rm lab}|<0.8$. Fourier coefficients extracted from long-range projected onto azimuthal angle difference...
The production of ${\rm\Xi}^-$ and ${\rm\Omega}^-$ baryons their anti-particles in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV has been measured using the ALICE detector. transverse momentum spectra mid-rapidity ($|y| < 0.5$) for charged $\rm\Xi$ $\rm\Omega$ hyperons have studied range $0.6 p_{\rm T} 8.0$ GeV/$c$ $1.2 7.0$ GeV/$c$, respectively, several centrality intervals (from most central 0-10% to peripheral 60-80% collisions). These compared with predictions recent hydrodynamic...
An angular analysis of the $B^{0}\rightarrow K^{*0}(\to K^{+}\pi^{-})\mu^{+}\mu^{-}$ decay is presented using a data set corresponding to an integrated luminosity 4.7 fb$^{-1}$ $pp$ collision collected with LHCb experiment. The full $C\!P$-averaged observables are determined in bins invariant mass squared dimuon system. Contamination from decays $K^{+}\pi^{-}$ system S-wave configuration taken into account. tension seen between previous results and Standard Model predictions persists new...
The pseudorapidity density of charged particles ($\mathrm{d}N_\mathrm{ch}/\mathrm{d}\eta$) at mid-rapidity in Pb-Pb collisions has been measured a center-of-mass energy per nucleon pair $\sqrt{s_{\rm NN}}$ = 5.02 TeV. It increases with centrality and reaches value $1943 \pm 54$ $|\eta|<0.5$ for the 5% most central collisions. A rise $\mathrm{d}N_\mathrm{ch}/\mathrm{d}\eta$ as function is observed, steeper than that observed proton-proton following trend established by measurements lower...
Transverse momentum spectra of $π^{\pm}$, $\rm K^{\pm}$ and p($\bar{\rm p}$) up to $p_{\rm T}$ = 20 GeV/$c$ at mid-rapidity in pp Pb-Pb collisions $\sqrt{s_{\rm NN}}=$ 2.76 TeV have been measured using the ALICE detector Large Hadron Collider. The proton-to-pion kaon-to-pion ratios both show a distinct peak T} \approx 3 GeV/c$ central collisions. Below peak, < GeV/$c$, are good agreement with hydrodynamical calculations, suggesting that itself is dominantly result radial flow rather than...
Direct photon production at mid-rapidity in Pb-Pb collisions $\sqrt{s_{_{\mathrm{NN}}}} = 2.76$ TeV was studied the transverse momentum range $0.9 < p_\mathrm{T} 14$ GeV$/c$. Photons were detected with highly segmented electromagnetic calorimeter PHOS and via conversions ALICE detector material $e^+e^-$ pair reconstructed central tracking system. The results of two methods combined direct spectra measured for 0-20%, 20-40%, 40-80% centrality classes. For all three classes, agreement found...
Quantum chromodynamics, the theory of strong force, describes interactions coloured quarks and gluons formation hadronic matter. Conventional matter consists baryons mesons made three quark-antiquark pairs, respectively. Particles with an alternative quark content are known as exotic states. Here a study is reported narrow state in D
The inclusive J/ψ nuclear modification factor (RAA) in Pb–Pb collisions at sNN=2.76TeV has been measured by ALICE as a function of centrality the e+e− decay channel mid-rapidity (|y|<0.8) and centrality, transverse momentum rapidity μ+μ− forward-rapidity (2.5<y<4). yields are suppressed compared to those pp scaled number binary collisions. RAA integrated over range corresponding 90% inelastic cross section is 0.72±0.06(stat.)±0.10(syst.) 0.58±0.01(stat.)±0.09(syst.) forward-rapidity. At low...
The yields of the K*(892)$^{0}$ and $\Phi$(1020) resonances are measured in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV through their hadronic decays using ALICE detector. measurements performed multiple centrality intervals mid-rapidity (|$y$|<0.5) transverse-momentum ranges 0.3 < $p_{\rm T}$ 5 GeV/$c$ for 0.5 $\Phi$(1020). suppressed central with respect to pp peripheral (perhaps due rescattering its decay products medium), while longer lived meson is not suppressed. These particles...
Searches are performed for both promptlike and long-lived dark photons, A^{'}, produced in proton-proton collisions at a center-of-mass energy of 13 TeV. These searches look A^{'}→μ^{+}μ^{-} decays using data sample corresponding to an integrated luminosity 5.5 fb^{-1} collected with the LHCb detector. Neither search finds evidence signal, 90% confidence-level exclusion limits placed on γ-A^{'} kinetic mixing strength. The A^{'} explores mass region from near dimuon threshold up 70 GeV...
We report measurements of the primary charged-particle pseudorapidity density and transverse momentum distributions in $p\ensuremath{-}\mathrm{Pb}$ collisions at $\sqrt{{s}_{\mathit{NN}}}=5.02\phantom{\rule{0.28em}{0ex}}\mathrm{TeV}$ investigate their correlation with experimental observables sensitive to centrality collision. Centrality classes are defined by using different event-activity estimators, i.e., multiplicities measured three regions as well energy beam rapidity (zero degree)....
We report the first results of elliptic ($v_2$), triangular ($v_3$) and quadrangular flow ($v_4$) charged particles in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV with ALICE detector CERN Large Hadron Collider. The measurements are performed central pseudorapidity region $|\eta|<0.8$ for transverse momentum range $0.2<p_{\rm T}<5$ GeV/$c$. anisotropic is measured using two-particle correlations a gap greater than one unit multi-particle cumulant method. Compared to from NN}}=2.76$ TeV,...
Measurements of multiparticle azimuthal correlations (cumulants) for charged particles in $p$-Pb at $\sqrt{{s}_{\mathrm{NN}}}=5.02$ TeV and Pb-Pb $\sqrt{{s}_{\mathrm{NN}}}=2.76$ collisions are presented. They help address the question whether there is evidence global, flowlike, system. Comparisons made to measurements from larger system, where such established. In particular, second harmonic two-particle cumulants found decrease with multiplicity, characteristic a dominance few-particle...
The production of (anti-)deuteron and (anti-)$^{3}\text{He}$ nuclei in Pb-Pb collisions at $\sqrt{{s}_{\mathrm{NN}}}=2.76$ TeV has been studied using the ALICE detector LHC. spectra exhibit a significant hardening with increasing centrality. Combined blast-wave fits several particles support interpretation that this behavior is caused by an increase radial flow. integrated particle yields are discussed context coalescence thermal-statistical model expectations. ratios, $^{3}\text{He}/d$...
A bstract We report the measured transverse momentum ( p T ) spectra of primary charged particles from pp, p-Pb and Pb-Pb collisions at a center-of-mass energy $$ \sqrt{s_{\mathrm{NN}}}=5.02 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mrow> <mml:mi>N</mml:mi> </mml:mrow> </mml:msub> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>5.02</mml:mn> </mml:math> TeV in kinematic range 0 . 15 < 50 GeV/ c | η 8. significant improvement...
Results are reported from an amplitude analysis of the $B^+\to D^+D^-K^+$ decay. The is carried out using LHCb proton-proton collision data taken at $\sqrt{s}=7,8,$ and $13$ TeV, corresponding to a total integrated luminosity 9 fb$^{-1}$. In order obtain good description data, it found be necessary include new spin-0 spin-1 resonances in $D^-K^+$ channel with masses around 2.9 GeV$/c^2$, charmonium resonance proximity spin-2 $\chi_{c2}(3930)$ state. widths these determined, as relative...
The production of the hypertriton nuclei $^{3}_{\Lambda}\mathrm H$ and $^{3}_{\bar{\Lambda}} \overline{\mathrm H}$ has been measured for first time in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV with ALICE experiment LHC energies. total yield, d$N$/d$y$ $\times \mathrm{B.R.}_{\left( ^{3}_{\Lambda}\mathrm H \rightarrow ^{3}\mathrm{He},\pi^{-} \right)} \left( 3.86 \pm 0.77 (\mathrm{stat.}) 0.68 (\mathrm{syst.})\right) \times 10^{-5}$ 0-10% most central collisions, is consistent...
The only anticipated resonant contributions to ${B}^{+}\ensuremath{\rightarrow}{D}^{+}{D}^{\ensuremath{-}}{K}^{+}$ decays are charmonium states in the ${D}^{+}{D}^{\ensuremath{-}}$ channel. A model-independent analysis, using LHCb proton-proton collision data taken at center-of-mass energies of $\sqrt{s}=7$, 8, and 13 TeV, corresponding a total integrated luminosity $9\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, is carried out test this hypothesis. description assuming that resonances...
Comprehensive results on the production of unidentified charged particles, ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}, {\mathrm{K}}^{\ifmmode\pm\else\textpm\fi{}}, {\mathrm{K}}_{\mathrm{S}}^{0}, {\mathrm{K}}^{*}{(892)}^{0}, p, \overline{p}, \ensuremath{\phi}$(1020), $\mathrm{\ensuremath{\Lambda}}, \overline{\mathrm{\ensuremath{\Lambda}}}, {\mathrm{\ensuremath{\Xi}}}^{\ensuremath{-}}, {\overline{\mathrm{\ensuremath{\Xi}}}}^{+}, {\mathrm{\ensuremath{\Omega}}}^{\ensuremath{-}}$, and...