Heavy-flavour hadronization in pp and heavy ion collisions at the LHC
The LHC Collaborations reported measurements of the baryon-to-meson ratios for open charm and bottom hadrons in pp, p-Pb and, to some extent, Pb-Pb collisions at the LHC that challenge the present understanding of heavy-quark hadronization in hadronic collisions. The Lambda_c/D, Xi_c/D and Lambda_b/B ratios at low momentum are larger than those measured in e+e– and ep collisions at LEP and HERA and predicted by event generators based on string fragmentation and tuned to describe the LEP and HERA data. The Lambda_c/D ratio in pp and p-Pb collisions is remarkably similar to the Lambda/K ratio and both are larger than the p/pi ratio.
These findings show that the baryon-to-meson ratio depends on the collision system, highlighting the relevance of “long-distance” effects in heavy-quark hadronization. Various QCD mechanisms are recently being considered in the theory community to describe the observations, including colour reconnection, ropes, or statistical approaches. Such effects also have an impact on the measurement of the total heavy-quark production cross section and on the usage of D and B meson production measurements to constrain the PDFs in the proton and in the nucleus.
In nucleus-nucleus collisions, where a hot and dense quark-gluon plasma forms and collectively expands, the enhancement of baryon-to-meson ratios is predicted by theoretical models in which heavy quarks with low momentum hadronize by coalescence with light quarks from the plasma. The first measurements of Lambda_c production in nucleus-nucleus at the LHC (and at RHIC) hint at a larger ratio to D mesons, with respect to the case of pp collisions.
The goals of the proposed workshop are:
- review and compare the results from the LHC experiments in various collision systems
- review the status of hadronisation in pp and p-Pb collisions as described in event generators
- discuss possible new measurements and theory developments
- discuss the possible commonalities of the physics mechanisms in small and large hadronic collision systems as well as in the light- and heavy-flavour sectors.
VIDYO connection will be available.
For information relative to housing, access to CERN for those not holding a CERN card and laptop registration, please check http://lpcc.web.cern.ch/about
The workshop is co-sponsored by the STRONG 2020 project (EU Horizon 2020 grant 824093).
Adriano Di Florio
Ahmed Ali
Aleksandr Berezhnoi
Alexander Philipp Kalweit
Alexis Pompili
Anastasios Papadopoulos
Andrea Addazi
Andrea Alici
Andrea Beraudo
Andrea Dainese
Andrea Rossi
Andrzej Siodmok
Angelo Esposito
Anton Andronic
Antonino Marciano
Antonio Davide Polosa
Antonio Polosa
Benjamin Audurier
Chiara Zampolli
Christopher Hills
David Krofcheck
Elisa Meninno
Erin Gauger
Fabio Catalano
Fabio Colamaria
Fabrizio Grosa
Federico Antinori
Fernando BARREIRO
Fouad Rami
Francesca Bellini
Francesco Dettori
Francesco Prino
Georgios Karathanasis
Gian Michele Innocenti
Giuseppe Bruno
Giuseppe Trombetta
Grazia Luparello
Hendrik van Hees
Hengne Li
Huasheng Shao
Jaime Norman
Jakub Kvapil
Javier Llorente Merino
Jean Cleymans
Jean-Philippe Lansberg
Joao Seixas
Konstantin Toms
Krzysztof Redlich
Leonardo Cristella
Lucas Anne Vermunt
Luciano Maiani
Luigi Dello Stritto
Marianna Mazzilli
Marielle Chartier
Matteo Cacciari
Maximiliano Puccio
Michelangelo Mangano
Min He
Muhammad Alibordi
Nicolo Jacazio
Nuno Leonardo
Nur Zulaiha Binti Jomhari
Oveis Sheibani
Peter Richardson
Peter Skands
Pietro Antonioli
Pim te Rietmole
Qamar Ul Hassan
Rahul Nair
Ralf Rapp
Sally Seidel
Salvatore Plumari
Sandro Fonseca De Souza
Sanjeev Kumar
Sebastian Tapia Araya
Sebastian Tapia Araya
Sergio Calvente Lopez
Silvia Masciocchi
Simon Plätzer
Simone Amoroso
Songkyo Lee
Stefano Trogolo
Vieri Candelise
Vit Kucera
Vivek Singh
Will Brooks
Yanxi Zhang
Zaida Conesa del Valle
Zhaozhong Shi
Émilien Chapon