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Theoretical Particle and Nuclear Physics

Prof. Nora Brambilla

Research Field

Our research is focused on Effective Field Theories (EFTs) and Renormalization Techniques with applications in Particle Physics and Hadronic/Nuclear Physics. Effective quantum field theories are the state-of-the-art tools for analyzing physical systems that contain many different energy or momentum scales. Such systems are the rule, rather than the exception, from the high-energy domain of Particle Physics to the low-energy domain of Nuclear Physics.

Specifically we construct and apply new effective field theories to deal with processes of strong interactions and QCD, Standard Model and beyond the Standard Model physics. At T30f we study non-relativistic effective field theories with applications to heavy-quark processes and quarkonium physics at accelerator experiments (BELLE, BESIII, LHC and PANDA experiments); EFTs for strong interactions at finite temperature and density with applications to processes taking place at heavy-ion experiments at RHIC and LHC, as well as in cosmological environments. Furthermore we work on high-order perturbative calculations in QCD with applications to precision determination of certain Standard Model parameters (quark masses, strong coupling constant) as well as non-perturbative and computational methods in field theory with application to non-perturbative QCD and the confinement mechanism.


James-Franck-Str. 1/I
85748 Garching b. München

Members of the Research Group




Other Staff


Course with Participations of Group Members

Offers for Theses in the Group

Dark Matter bound states

Unlike  normal matter, dark matter  does not interact  with  the electromagnetic  force.
This  means it  does  not absorb, reflect  or emit light, making  it extremely hard to  spot. In
fact, researchers have been able to infer the existence of dark matter
only  from  the gravitational  effect  it  seems  to have  on  visible
matter. Dark  matter seems to  outweigh visible matter roughly  six to
one, making up about 27% of the universe, but  it cannot  be explained
inside  the Standard  model of  particle physics.
A lot of contemporary research goes into the search and characterization
of dark matter candidates. In such framework it is very important to
be able to account for bound states interactions that can modify
dark matter production and annihilation cross sections for some
order of magnitudes.
Scope of the thesis  is to analyze some simple models for nonrelativistic
dark matter bound state effects using nonrelativistic effective field theories
and solving appropriate Schroedinger equations.

suitable as
  • Bachelor’s Thesis Physics
Supervisor: Nora Brambilla
Dense 2 color QCD

The QCD phase state diagram is object of study both in theory and in
experiments. A particular interesting phase is the one of high chemical potential.
Scope of this thesis is to study a recent paper on this subject in which
a version of QCD with two colors and two flavors of fermions has been studied on the
lattice as a function of the chemical potential mu and the temperature T.
In particular it is found that the quarkyonic region, where the behaviour of the quark number density and the
diquark condensate are described by a Fermi sphere of almost free quarks distorted by a BCS
gap, extends to larger chemical potentials with decreasing lattice spacing or quark mass. In both
cases, the quark number density also approaches its non-interacting value. The pressure at low
temperature is found to approach the Stefan–Boltzmann limit from below.

suitable as
  • Bachelor’s Thesis Physics
Supervisor: Nora Brambilla
Numerical solution of the Langevin equation

Heavy quarkonia, namely  bound states of a heavy  quark and antiquark,
turn out to be useful systems to  probe the Quark Gluon Plasma (QGP)
the new state of matter originated in heavy ion collision at the LHC
at CERN and at RHIC at BNL. In particular the hot state of  matter can
induce thermal  modifications to  the quarkonium
states.  Experimentally  we  can  see   such  effects  either  in  the
quarkonium suppression  or in  changes in  the bound  state properties
(masses and widths). From a theoretical point of view, effective field
theories give  us the possibility to  study in detail what  happens to
heavy quarkonia  in this extremely  hot state  of matter. The  goal of
this thesis is to obtain  efficient numerical solutions to some
Langevin equations for the quarkonium density  obtained from the
corresponding field theoretical master equation in the classical limit.

suitable as
  • Bachelor’s Thesis Physics
Supervisor: Nora Brambilla
X, Y, Z exotic states

X, Y,  Z states are  exotics states  observed in the  heavy quarkonium
sector at several high energy accelerator experiments (Belle in Japan,
BES  in  China  and  experiments  at  the  Large  Hadron  Collider  at
CERN). They  are formed by a  heavy quark, a heavy  antiquark and some
other  component  (gluonic-hybrids or  light-quarks-tetraquarks)  that
make them  non-standard. The properties  of these states  are directly
related to  the nonperturbative nature  of low  energy QCD and  to the
confinement mechanism of strong  interactions. Lattice calculations of
the hybrid and tetraquark static  energies are available. The scope of
the thesis  is to  use these lattice  curves together  with elementary
notions  of   nonrelativistic  effective  field  theories   to  obtain
interaction potentials  and solve numerically  appropriate Schrödinger
equations to obtain information on the masses and transitions of these
exotic states.

suitable as
  • Bachelor’s Thesis Physics
Supervisor: Nora Brambilla

Current and Finished Theses in the Group

Electromagnetic Decay and Production of Heavy Quarkonium
Abschlussarbeit im Masterstudiengang Physik (Kern-, Teilchen- und Astrophysik)
Themensteller(in): Nora Brambilla
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