Summary:
Quantum Chromo-Dynamics (QCD) of the strong interaction predicted a new state of matter of quarks and gluons at high energy density or at high baryo-chemical potential, where those elementary particles are released from usual confinement in hadrons. This state of QCD matter, called Quark Gluon Plasma (QGP), has been reproduced and discovered via high energy nucleus-nucleus collisions. Leptons and photons have been recognized as the most promising probes to investigate the QGP properties without disturbed by final state strong interaction. Forward muons at LHC are especially powerful since the physics region of interest and the technical region of covered kinematics overlap at the highest ever collision energy. We will build, install, and commission Muon Forward Tracker (MFT) with a strong collaboration between France and Japan at the ALICE experiment. It expands the physics reach of the ALICE muon spectrometer to J/psi, psi(2S), Upsilons and open beauty hadrons down to very low transverse momenta, opening unique programs at LHC.

French members:
G. Batigne, G. Martinez, S. Panebianco, R. Tieulent

Japanese members:
K. Shigaki, H. Hamagaki, K. Oyama, M. Shimomura, Y. Yamaguchi

References:
[1] Technical Design Report for the Muon Forward Tracker, https://cds.cern.ch/record/1981898
[2] Addendum of the Letter of Intent for the upgrade of the ALICE experiment : The Muon Forward Tracker,
https://cds.cern.ch/record/1592659
[3] J/psi suppression at forward rapidity in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV , ALICE Collaboration (B. Abelev et al.), Phys. Rev. Lett. 109 (2012) 072301, DOI: 10.1103/PhysRevLett.109.072301
[4] Production of muons from heavy flavour decays at forward rapidity in pp and Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV, ALICE Collaboration (B. Abelev et al.), Phys. Rev. Lett. 109 (2012) 112301, DOI: 10.1103/PhysRevLett.109.112301
[5] Light vector meson production in pp collisions at sqrt(s) = 7 TeV, ALICE Collaboration (B. Abelev et al.), Phys. Lett. B710 (2012) 557-568, DOI: 10.1016/j.physletb.2012.03.038

website:
ALICE : http://alice-collaboration.web.cern.ch/

Summary:
The collisions of relativistic heavy-ion collisions allow us to study the properties of matter at extreme temperatures and densities. One of the most important and most challenging subjects is the search for the hypothetical critical point of Quantum Chromodynamics. Due to the rapid evolution of the matter created in these experiments and the phenomenon of critical slowing down it is crucial to develop dynamical models of observables sensitive to the critical point and in general the phase transition between the quark-gluon plasma (QGP) and the hadronic particles. The possibility to make quantitative predictions for these observables is not only important for currently running experiments, but also for upcoming facilities, in particular J-PARC in Japan.

French members:
M. Nahrgang, R. Attieh, M. Bluhm, G. Pihan, N. Touroux

Japanese members:
M. Kitazawa, H. Ito, T. Nishimura

References:
[1] M. Bluhm et al., "Dynamics of critical fluctuations: Theory – phenomenology – heavy-ion collisions," Nucl. Phys. A 1003 (2020), 122016, arXiv:2001.08831 [nucl-th].
[2] M. Nahrgang et al., "Diffusive dynamics of critical fluctuations near the QCD critical point," Phys. Rev. D 99 (2019) no.11, 116015, arXiv:1804.05728 [nucl-th].
[3] M. Sakaida et al., "Dynamical evolution of critical fluctuations and its observation in heavy ion collisions," Phys. Rev. C 95 (2017) no.6, 064905, arXiv:1703.08008 [nucl-th].

Summary :

French members :
R. Guernane, G. Conesa Balbastre, J. Faivre, C. Furget, J. Norman, Y. Schutz, I. Belikov, A. Maire, F. Rami, B. Hippolyte, C. Kuhn

Japanese members :
T. Chujo, Y. Miake, M. Inaba, T. Sugitate, M. Shimomura, H. Sako, H. Hamagaki, T. Gunji, N. Novitzky, S. Sakai, T. Hashiya

References:

website:
http://aliweb.cern.ch