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Junji Hisano15/06/2021, 20:00
WIMPs are the candidate of dark matter in the universe. In this talk, I will talk about elecroweakly intearcting dartk matter. It is well-motivated in particle physics model beyond the standard model. The direct and indirect detection of dark matter and also dark matter sesarches at LHC now give severe constraints on the WIMP models while elecroweakly intearcting dartk matter is still free...
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Kallia Petraki15/06/2021, 20:40
The production of dark matter via thermal decoupling from the primordial plasma, and the direct, indirect and collider signals associated with this mechanism, have been the pillars of dark matter phenomenology in the past decades. In sharp contrast to the sub-TeV regime, the interactions of thermal-relic dark matter with multi-TeV or larger mass manifest as long-range. This is supported by...
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Mikko Laine15/06/2021, 21:40
After comparing the physical roles of thermal pair annihilation of non-relativistic particles in QCD and in cosmology, I discuss the tools that can be used for estimating this rate, either perturbatively or through lattice simulations. Subsequently it is illustrated how in strongly coupled systems, bound states may give a large contribution to the thermal pair annihilation rate, even if model...
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Antonio Vairo15/06/2021, 22:20
I discuss quarkonium dissociation and evolution in a medium in the framework of non relativistic EFTs. In particular I compute the gluodissociation and inelastic parton scattering widths, and, by treating the quarkonium as an open quantum system, write and solve the corresponding Lindblad equation. Finally I compare the so obtained nuclear modification factor with LHC data.
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Tobias Binder (Kavli IPMU)16/06/2021, 20:00
We derive differential equations from path-integral based non-equilibrium quantum field theory, that cover the dynamics and spectrum of non-relativistic two-body fields for any environment. For concreteness of the two-body fields, we choose the full potential non-relativistic Quantum Electrodynamics Lagrangian in this work. After closing the correlation function hierarchy of these equations...
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Miguel Ángel Escobedo Espinosa16/06/2021, 20:40
Quarkonium suppression is one of the probes of the formation of a quark-gluon plasma in heavy-ion collisions. Three phenomena influence the evolution of quarkonium in a medium: screening, collisions with medium partons and recombination. A formalism in which all these mechanisms can be described consistently is that of open quantum system. In this talk, I will review how to combine the open...
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Tom Mehen16/06/2021, 21:40
I will review the Non-Relativistic Quantum Chromodynamics (NRQCD) factorization formalism for the calculation of quarkonia production and decays. I will discuss the current status of quarkonium production in pp collision, highlighting successes and pointing out outstanding problems. I will then discuss a theoretical approach to deriving transport equations for quarkonia in the quark-gluon...
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Weiyao Ke16/06/2021, 22:20
High-energy nuclear collisions create a new state of hot and dense matter---the quark-gluon plasma (QGP), which then undergoes fast hydrodynamic-like expansion and eventually freezes out to hadrons. The presence of the QGP medium strongly modifies the production yield of quarkonia. Quarkonia, as bound states of heavy- and anti-heavy quark pairs under the strong force, are sensitive to the...
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Simone Biondini17/06/2021, 20:00
In order to compute accurately the relic energy density of dark matter particles featuring co-annihilating partners, it is important to address the annihilations of the latter if the mass splitting is small. Coloured co-annihilators participating QCD interactions offer a rich phenomenology, and their dynamics in the early universe resembles that of heavy quarks in a quark-gluon plasma. Making...
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12. Chromoelectric field correlator for quarkonium transport and thermal dark matter relic abundanceBruno Scheihing Hitschfeld17/06/2021, 20:30
Quantifying the transport properties of heavy particles traveling through thermal non-abelian plasmas is of paramount importance to interpret measurements on those particles conducted after the freezeout. One such example is quarkonium suppression in heavy-ion collisions (HIC). To explain the experimental data and extract physical quantities encoding the properties of the QGP, a solid...
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13. Electroweak WIMP annihilation, resummed beyond LO with non-relativistic dark matter EFT and SCETMartin Beneke17/06/2021, 21:10
This talk approaches electroweak WIMP annihilation from the perspective of the EFT for quarkonium annhilation. After discussing the similarities and differences, I cover next-to-leading order corrections to the potential between static sources with SU(2) x U(1) charge after electroweak symmetry breaking and their impact on the computation of the Sommerfeld-corrected dark matter relic density....
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Juri Smirnov17/06/2021, 21:50
Dark matter freezeout can be severely affected by non-perturbative effects, such as bound state formation. This is particularly relevant in the regime where the dark matter mass exceeds the mass of the force mediator. Concrete examples are: heavy dark matter, that interacts with the electroweak force, and dark matter that freezes out in a co-annihilation process with a color-charged partner...
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Julia Harz17/06/2021, 22:20
Given the growing constraints on WIMP dark matter, coannihilation scenarios gain more and more interest. However, in order to theoretically predict the relic density, different effects have to be taken into account. In colored coannihilation scenarios, the importance of long-range interactions mediated by gauge bosons, the so-called Sommerfeld effect, is by now well established. Due to its...
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Tracy Slatyer18/06/2021, 20:00
I will discuss the potential importance of a dark hadronization phase transition in the early universe in setting the measured relic abundance, for a simple model of strongly interacting dark matter. Enhancement of the dark matter density within shrinking pockets of the deconfined phase leads to a dramatic reduction in the late-time dark matter abundance, allowing for much heavier dark matter...
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Kallia Petraki18/06/2021, 20:40
Abstract: The capture of particle-antiparticle pairs or pairs of identical particles into bound states via emission of a neutral scalar is a quadrapole transition that becomes phenomenologically significant only at rather large couplings. However, if the scalar carries a conserved charge, then its emission alters the Hamiltonian of the interacting particles, resulting in monopole transitions...
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Michael Strickland18/06/2021, 21:20
The strong suppression of bottomonia in ultra-relativistic heavy-ion collisions is a smoking gun for the production of a deconfined quark-gluon plasma (QGP). In this talk I will discuss recent work that aims to provide a more comprehensive and systematic understanding of bottomonium dynamics in the QGP. The new paradigm is based on an open quantum system approach applied in the framework of...
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Alexander Rothkopf18/06/2021, 22:00
The past decade has seen ample progress in the study of the dynamical properties of strongly interacting systems at finite temperature. Lattice QCD constitutes a key tool and promises first principles access to phenomenologically relevant phenomena, such as (charge-)transport and in-medium binding properties of heavy fermions. In this presentation I will review recent selected lattice QCD...
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