Probing the charm-quark dead cone effect in heavy ion collisions

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1. Très proche Même question Pas pertinent

   The dead-cone effect in charm, bottom and top quark jets in angular and momentum space

   R. Pérez-Ramos, S. Kluth, Wolfgang Ochs · 2026 · Pas encore résumé

   The study examines the dead-cone suppression in heavy-quark jets, including charm, through angular distributions and momentum spectra.

   Résumé scientifique

   The dead-cone effect reflects the mass dependence of QCD radiation from heavy quarks. We investigate this phenomenon from charm and bottom to top quarks using two-dimensional angular distributions and single-particle inclusive momentum spectra. The angular distributions illustrate the depletion of radiation around the heavy-quark direction, while the momentum spectra provide a quantitative observable of the effect. For charm and bottom jets, fragmentation functions reconstructed from LEP data at the $Z$ pole exhibit a strong suppression of high-momentum particles, quantitatively described within the Modified Leading Logarithmic Approximation of perturbative QCD. The analysis is extended to $…

2. Très proche Base de cet article Cité par cet article Pas pertinent

   Direct observation of the dead-cone effect in quantum chromodynamics

   S. Acharya, D. Adamova, A. Adler et al. · 2021 · Nature · cité 104 fois · Pas encore résumé

   Cette observation directe du cône mort en QCD est citée comme référence pour étudier sa manifestation dans les collisions d’ions lourds.

   Résumé scientifique

   In particle collider experiments, elementary particle interactions with large momentum transfer produce quarks and gluons (known as partons) whose evolution is governed by the strong force, as described by the theory of quantum chromodynamics (QCD)1. These partons subsequently emit further partons in a process that can be described as a parton shower2, which culminates in the formation of detectable hadrons. Studying the pattern of the parton shower is one of the key experimental tools for testing QCD. This pattern is expected to depend on the mass of the initiating parton, through a phenomenon known as the dead-cone effect, which predicts a suppression of the gluon spectrum emitted by a hea…

3. Très proche Contexte plus large Cité par cet article Pas pertinent

   Studies of Charm Quark Diffusion inside Jets Using Pb-Pb and pp Collisions at sNN=5.02 TeV

   A. Sirunyan, A. Tumasyan, W. Adam et al. · 2020 · Physical Review Letters · cité 17 fois · Pas encore résumé

   Cette étude mesure la distribution radiale des mésons D⁰ dans les jets PbPb et pp, plutôt que les émissions collinéaires associées au cône mort.

   Résumé scientifique

   The first study of charm quark diffusion with respect to the jet axis in heavy ion collisions is presented. The measurement is performed using jets with p jet T > 60 GeV =c and D 0 mesons with p DT > 4 GeV =c in lead-lead (Pb-Pb) and proton-proton ( pp ) collisions at a nucleon-nucleon center-of-mass energy of ffiffiffiffiffiffiffiffi s NN p ¼ 5 . 02 TeV, recorded by the CMS detector at the LHC. The radial distribution of D 0 mesons with respect to the jet axis is sensitive to the production mechanisms of the meson, as well as to the energy loss and diffusion processes undergone by its parent parton inside the strongly interacting medium produced in Pb-Pb collisions. When compared to Monte Carlo event gener…

4. Proche Autre approche du problème Cité par cet article Utilisé en profondeur par cet article Pas pertinent

   Dead-cone searches in heavy-ion collisions using the jet tree

   L. Cunqueiro, D. Napoletano, Alba Soto-Ontoso · 2022 · Physical Review D · cité 16 fois · Pas encore résumé

   Cette étude propose un groomer de l’arbre du jet pour isoler le rayonnement induit par le milieu dans le cône mort des quarks lourds.

   Résumé scientifique

   We explore the possibility of using the dead cone of heavy quarks as a region of the Lund plane where medium-induced gluon radiation can be isolated and characterised. The filling of the dead cone by medium-induced gluons is expected to be the result of the interplay between the minimum angle of such radiation due to transverse momentum broadening and the dead-cone angle. Since the measurement of a fully corrected Lund plane in heavy-ion collisions is currently challenging, we propose to use jet grooming techniques to identify a particular splitting in the jet tree that is both perturbative and sensitive to the dead-cone effect. To that end, we propose a new jet substructure groomer, dubbed …

5. Proche* Base de cet article Cité par cet article Pas pertinent

   On specific QCD properties of heavy quark fragmentation ( dead cone )

   Y. Dokshitzer, V. Khoze, S. Troyan · 1991 · Journal of Physics G · cité 186 fois · Pas encore résumé

   Ce travail sur les propriétés de fragmentation des quarks lourds et le cône mort est cité comme référence théorique antérieure.

6. Proche Autre approche du problème Cité par cet article Pas pertinent

   Seeing beauty in the quark-gluon plasma with energy correlators

   C. Andres, F. Domínguez, J. Holguin et al. · 2023 · Physical Review D · cité 38 fois · Pas encore résumé

   Cette étude propose des corrélateurs d’énergie pour distinguer la suppression à petit angle du rayonnement induit par le milieu dans les jets de beauté.

   Résumé scientifique

   Heavy quarks created in heavy-ion collisions serve as an excellent probe of the produced quark-gluon plasma (QGP). The radiation pattern of jets formed from heavy quarks as they traverse the QGP exhibits a particularly interesting structure due to the interplay of two competing effects: the suppression of small-angle radiation, also known as the “dead-cone” effect, and the enhancement of emitted gluons by medium-induced radiation. In this , we propose a new observable, based on the energy correlator approach to jet substructure, which will allow us to disentangle the two scales associated to these two phenomena and to determine under which conditions the dead cone is filled by medium-induced…

7. Proche Contexte plus large Pas pertinent

   Enhanced Standard Model bound on charm CP violation from QCD penguins

   Ali Mohamed, Maria Laura Piscopo · 2026 · cité 1 fois · Pas encore résumé

   Cette étude calcule des éléments de matrice de désintégrations de mésons D⁰ pour la violation de CP, sans examiner le rayonnement des jets.

   Résumé scientifique

   We investigate the impact of QCD penguin operators on direct CP violation in singly Cabibbo-suppressed $D^0$ decays within the framework of light-cone sum rules (LCSR) using pion and kaon light-cone distribution amplitudes. We determine, for the first time, the hadronic matrix elements of the QCD penguin operators for $D^0\to K^+K^-$ and $D^0\to\pi^+\pi^-$ at leading order in $\alpha_s$, employing a three-point correlation function with an artificial momentum to avoid unphysical parasitic cuts. We also compute the matrix elements of the current-current operators using the same framework and compare them with previous LCSR results. We find that the scalar penguin operators $Q_5$ and $Q_6$ can…

8. Proche Article de revue Cité par cet article Pas pertinent

   Overview of high-density QCD studies with the CMS experiment at the LHC

   Cms Collaboration · 2024 · Physics reports · cité 82 fois · Pas encore résumé

   Cette revue présente des mesures CMS sur le plasma quark-gluon, dont le programme de collisions d’ions lourds auquel se rattache l’étude.

   Résumé scientifique

   We review key measurements performed by CMS in the context of its heavy ion physics program, using event samples collected in 2010-2018 with several collision systems and energies. These studies provide detailed macroscopic and microscopic probes of the quark-gluon plasma (QGP) created at the LHC energies, a medium characterized by the highest temperature and smallest baryon-chemical potential ever reached in the laboratory. Numerous observables related to high-density quantum chromodynamics (QCD) were studied, leading to some of the most impactful and qualitatively novel results in the 40-year history of the field. Using a dedicated high-multiplicity trigger in the first pp run, CMS discove…

Les travaux antérieurs sur lesquels il s’appuie

1. Proche Résultats différents Pas pertinent

   Medium induced gluon radiation off massive quarks fills the dead cone

   N. Armesto, C. Salgado, U. Wiedemann · 2003 · Physical Review D · cité 286 fois · Pas encore résumé

   Ce calcul prévoit que le rayonnement induit par le milieu remplit généralement le cône mort, tandis que la mesure défavorise cette hypothèse.

   Résumé scientifique

   We calculate the transverse momentum dependence of the medium-induced gluon energy distribution radiated off massive quarks in spatially extended QCD matter. In the absence of a medium, the distribution shows a characteristic mass-dependent depletion of the gluon radiation for angles $\ensuremath{\theta}lm/E,$ the so-called dead cone effect. Medium modifications of this spectrum are calculated as a function of quark mass m, initial quark energy E, in-medium path length and density. Generically, medium-induced gluon radiation is found to fill the dead cone, but it is reduced at large gluon energies compared to the radiation off light quarks. We quantify the resulting mass dependence for momen…

2. Apparenté Base de cet article Pas pertinent

   Heavy quark energy loss in the Hybrid Model

   A. Beraudo, J. D. Du Plessis, D. Pablos et al. · 2025 · Journal of High Energy Physics · cité 3 fois · Pas encore résumé

   Ce modèle de perte d’énergie des quarks lourds dans le plasma fournit un cadre cité pour comparer les effets du milieu sur les jets.

   Résumé scientifique

   Heavy quarks offer an invaluable hard probe of the droplets of quark gluon plasma (QGP) formed in heavy ion collisions at the LHC and RHIC. Given their large mass, they are predominantly produced in hard scattering processes at the earliest moment of a collision and given their rarity they almost never annihilate with a heavy antiquark subsequently. This means that they experience, and probe, the entire history of the expanding, cooling, droplet of QGP from hydrodynamization through hadronization. Quantitative measurements of heavy quark final state observables therefore give us access to information about the transport properties of QGP as well as about medium modifications of hadronization…

3. Apparenté Base de cet article Utilisé en profondeur par cet article Pas pertinent

   A model of jet quenching in ultrarelativistic heavy ion collisionsand high- pT hadron spectra at RHIC

   I. Lokhtin, A. Snigirev · 2005 · The European Physical Journal C - Particles and Fields · cité 411 fois · Pas encore résumé

   Ce modèle Monte-Carlo simule le rescattering et la perte d’énergie des partons durs dans les collisions d’ions lourds.

   Résumé scientifique

   Abstract.The method to simulate the rescattering and energy loss of hard partons in ultrarelativistic heavy ion collisions has been developed. The model is a fast Monte Carlo tool introduced to modify a standard PYTHIA jet event. The full heavy ion event is obtained as a superposition of a soft hydro-type state and hard multi-jets. The model is applied to the analysis of the jet quenching pattern at RHIC.

4. Apparenté Même méthode, autre problème Pas pertinent

   Jet fragmentation function and groomed substructure of bottom quark jets in proton-proton collisions at 5.02 TeV

   V. Chekhovsky, A. Hayrapetyan, V. Makarenko et al. · 2025 · Journal of High Energy Physics · cité 7 fois · Pas encore résumé

   Cette mesure utilise la sous-structure élaguée de jets lourds avec CMS, mais étudie les jets de beauté en collisions pp.

   Résumé scientifique

   A measurement of the substructure of bottom quark jets (b jets) in proton-proton (pp) collisions is presented. The measurement uses data collected in pp collisions at s=5.02\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \sqrt{s}=5.02 $$\end{document} TeV, with a low number of simultaneous interactions per bunch crossing, recorded by the CMS experiment in 2017, corresponding to an integrated luminosity of 301 pb−1. An algorithm to identify and cluster the charged decay daughters of b hadrons is developed for thi…

5. Apparenté Données, outil ou méthode en commun Utilisé en profondeur par cet article Pas pertinent

   Particle-flow reconstruction and global event description with the CMS detector

   A. Sirunyan, A. Tumasyan, W. Adam et al. · 2017 · cité 1 365 fois · Pas encore résumé

   Cet article décrit la reconstruction particle-flow du détecteur CMS, méthode de reconstruction utilisée pour les analyses de collisions.

   Résumé scientifique

   The CMS apparatus was identified, a few years before the start of the LHC operation at CERN, to feature properties well suited to particle-flow (PF) reconstruction: a highly-segmented tracker, a fine-grained electromagnetic calorimeter, a hermetic hadron calorimeter, a strong magnetic field, and an excellent muon spectrometer. A fully-fledged PF reconstruction algorithm tuned to the CMS detector was therefore developed and has been consistently used in physics analyses for the first time at a hadron collider. For each collision, the comprehensive list of final-state particles identified and reconstructed by the algorithm provides a global event description that leads to unprecedented CMS per…