Hard-soft correlations in hadronic collisions - GDR QCD

Amphithéâtre Recherche (Laboratoire de Physique de Clermont-Ferrand, Université Clermont Auvergne, Clermont-Ferrand)

Amphithéâtre Recherche

Laboratoire de Physique de Clermont-Ferrand, Université Clermont Auvergne, Clermont-Ferrand

Campus Universitaire des Cézeaux 4 avenue Blaise Pascal TSA 60026 CS 60026 63178 AUBIERE CEDEX FRANCE
Helene FONVIEILLE (LPC-Clermont), Hervé Moutarde (CEA-IRFU-SPHN), Raphaël Dupré (IPN Orsay), Sarah Porteboeuf-Houssais (LPC)

This workshop aims at discussing latest experimental and theoretical results concerning correlations between hard and soft particles produced in high energetic hadronic collisions. 

This workshop is supported by working group of the GDR QCD : "Simple and multiple interactions within partons in nucleus". 

 It follows previous workshops: "Meeting de lancement GDR QCD - interactions simples et multiples entre partons dans les nucléons": https://indico.in2p3.fr/event/13459/  and "Partons and Nuclei" https://indico.in2p3.fr/event/14438/.

Ample time is devoted to discussion among participants.

Registration is free of charge, lunches and coffee breaks are supported by the GDR QCD, the Laboratoire de Physique de Clermont (LPC), The Université Clermont Auvergne (UCA) and the Clermont Auvergne Metropole.

Please join the meeting by joining the workshop in Amphitheater Recherche at LPC/UCA, Clermont-Ferrand, or by clicking this link:


If you want to join by phone, please use one of the phone numbers listed in the link below: 


and enter the meeting extension 105602 in order to join.


  • Antonio Uras
  • Audrey Francisco
  • Boris Kopeliovich
  • Christian Weiss
  • Cyrille Marquet
  • Fabrizio Grosa
  • Franck Manso
  • Guillaume Taillepied
  • helene Fonvieille
  • Hervé Moutarde
  • Hua-Sheng Shao
  • Irina Potashnikova
  • Jana Crkovska
  • Jean-Philippe Lansberg
  • Livio Bianchi
  • Marianna Mazzilli
  • Martino Gagliardi
  • Matteo Rinaldi
  • Michael Winn
  • Nicole Bastid
  • Nodoka Yamanaka
  • Pascal Dupieux
  • Philippe Crochet
  • Preeti Dhankher
  • Sarah Porteboeuf-Houssais
  • Steffen Weber
  • Sumit Basu
  • Tanguy Pierog
  • Tasnuva Chowdhury
  • Yanchun Ding
  • Ziad Jean AJALTOUNI
  • Émilien Chapon
Sarah Porteboeuf-Houssais
    • 12:00 14:00
      Lunch with lunch box 2h
    • 14:00 14:10
      Welcoming and introduction 10m
      Orateur: Sarah Porteboeuf-Houssais (LPC)
    • 14:10 14:50
      Effects of saturation in high-multiplicity pp collisions 40m

      Parton distributions in the protons colliding with multiplicity much higher than the mean value, are biased to higher parton densities, leading to enhanced effects of saturation. This and the effect of mutual boosting of the saturation scales significantly increase the gluon density at small x, and correspondingly the production rate of J/psi
      and pT broadening, in a good accord with data.

      Orateur: Boris Kopeliovitch
    • 14:50 15:30
      Hard-soft correlations with the MFT 40m
      Orateur: Antonio Uras (IPNL Lyon)
    • 15:30 16:10
      Hard-soft correlations in the EPOS event generator 40m
      Orateur: Tanguy Pierog (KIT, IKP)
    • 16:10 16:40
      Coffee Break 30m
    • 16:40 17:20
      Charmonium production versus multiplicity in PYTHIA8 40m
      Orateur: Steffen Weber
    • 17:20 18:00
      Heavy-flavour with charged-particle correlations and collective effects in p-Pb collisions at $\sqrt{s_\mathrm{NN}}$= 5.02 TeV with ALICE at the LHC 40m
      Orateur: Marianna Mazzilli
    • 18:00 18:40
      Correlations between low-pt Z bosons and soft gluons in p+p and p+A collisions 40m
      Orateur: Cyrille Marquet (CPHT - Ecole Polytechnique)
    • 20:00 23:00
      Social Dinner - Odevie 3h

      1 Rue Eugène Gilbert
      63000 Clermont-Ferrand

      Place de Jaude (central place in Clermont-Ferrand city)
      A Tram/bus line.
      15 euros, at participant charge to be paid directly at the restaurant.

    • 09:00 09:40
      Proton structure via double parton scattering 40m
      Orateur: Matteo Rinaldi
    • 09:40 10:20
      Hard-soft correlations with LHCb 40m
      Orateur: Michael Winn
    • 10:20 10:50
      Coffee Break 30m
    • 10:50 11:30
      Transverse geometry and hard-soft correlations in high-energy pp collisions 40m
      Orateur: Christian Weiss
    • 11:30 12:10
      J/Psi production in pp and pPb 40m
      Orateur: Jana Crkovska (IPN Orsay)
    • 12:10 14:00
      Lunch Break - Cocktail 1h 50m
    • 14:00 14:40
      Probing gluon nPDF with heavy quarkonium 40m
      Orateur: Hua-Sheng Shao (CERN)
    • 14:40 15:20
      Soft particle production in different multiplicity environments 40m
      Orateur: Livio Bianchi (INFN Torino - Universita' di Torino)
    • 15:20 15:50
      Coffee break 30m
    • 15:50 16:30
      Open charm production in dense hadronic environnement 40m

      The production of open-heavy flavours in pp and p–nucleus collisions as a function of the charged-particle multiplicity (dNch/dη) can give insight into multiple parton interactions and into the interplay between hard and soft processes. Moreover, the comparison of the production of charmed mesons with and without strange-quark content and the baryon-to-meson ratio can help to study collective-like effects that in recent years have been observed in high multiplicity pp and p–nucleus collisions. These effects are typical of nucleus–nucleus collisions in which a Quark-Gluon Plasma with high-energy density is formed. This state produces a system with dense hadronic environment. It is interesting to investigate heavy-ion typical phenomena in the heavy-flavour sector across collisions systems as a function of the event activity, and, vice versa, to study in detail the coupling of heavy quarks to the ”bulk” in heavy-ion collisions. Indeed, the measurement of the production of open heavy-flavour hadrons in nucleus–nucleus collisions can provide important information about the microscopic interactions of heavy quarks with the medium constituents. In particular, the mea- surement of the azimuthal anisotropies at low transverse momentum, quantified by the elliptic flow v2, gives insight into the participation of the heavy quarks in the collective expansion of the system and their possible thermalisation in the medium. Additional insight into the dynamics of the heavy quarks can be provided by the application of the event-shape engineering (ESE) technique to the D-meson v2. Mea- suring the D-meson v2 in classes of events defined on the basis of the average flow in a given centrality class allows us to evaluate the correlation between the elliptic flow of soft hadrons and D mesons.
      In this talk, the latest results on the production of open-heavy flavour production,
      including the ratio between the production of D+s and non-strange D mesons, as a
      function of dNch/dη in pp, p–Pb and Pb–Pb collisions at √sNN = 5.02 TeV with
      ALICE will be presented. The enhancement of the relative abundance of Λ+c baryons
      compared to D mesons in pp and p–Pb collisions with respect to that measured in
      e e collisions will be discussed. Finally, the first application of the ESE technique
      to the measurement of the D-meson v2 in Pb–Pb collisions at sNN = 5.02 TeV with ALICE will be also presented.

      Orateur: Fabrizio Grosa
    • 16:30 17:10
      Round table : soft-hard correlations in hadronic collisions, what's next ? 40m
    • 09:00 09:40
      Double parton scattering studies in associated quarkonium production at the LHC and Tevatron 40m
      Orateur: Nodoka Yamanaka (IPN Orsay, Paris-Sud U., CNRS-IN2P3)
    • 09:40 10:20
      Hard soft correlations with CMS 40m
      Orateur: Émilien Chapon (SPP / Irfu / CEA Saclay)
    • 10:20 10:40
      Coffre break 20m
    • 10:40 11:20
      AFTER@LHC 40m
      Orateur: Jean-Philippe Lansberg (IPNO - Paris-Sud U. - CNRS/IN2P3)
    • 11:20 11:30
      Closing 10m
    • 11:30 13:00
      Lunch with Lunch box 1h 30m
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