Review of EFT treatment of quarkonium at finite temperature

Ghiglieri, Jacopo

doi:10.22323/1.171.0004

Cited by 6 publications

(6 citation statements)

References 44 publications

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“…8 Then, depending on whether the temperature scale is larger or smaller than M η v, different pNREFTs are obtained (see refs. [32,33,52] for heavy quarkonium). In our case, the degrees of freedom are the singlet, octet and sextet wave function fields and the matching coefficients correspond to the singlet, octet and sextet potentials respectively.…”

Section: Qcd-potentials For Coloured Scalars In Pnreftmentioning

confidence: 99%

Coloured coannihilations: dark matter phenomenology meets non-relativistic EFTs

Biondini

2019

J. High Energ. Phys.

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We investigate the phenomenology of a simplified model with a Majorana fermion as dark matter candidate which interacts with Standard Model quarks via a colour-charged coannihilation partner. Recently it has been realized that non-perturbative dynamics, including the Sommerfeld effect, bound state formation/dissociation and thermal corrections, play an important role in coannihilations with coloured mediators. This calls for a careful analysis of thermal freeze-out and a new look at the experimental signatures expected for a thermal relic. We employ a state of the art calculation of the relic density which makes use of a non-relativistic effective theory framework and calculate the effective annihilation rates by solving a plasma-modified Schrödinger equation. We determine the cosmologically preferred parameter space and confront it with current experimental limits and future prospects for dark matter detection.

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Section: Qcd-potentials For Coloured Scalars In Pnreftmentioning

confidence: 99%

Coloured coannihilations: dark matter phenomenology meets non-relativistic EFTs

Biondini

2019

J. High Energ. Phys.

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“…where one recognizes the leading term to be a Yukawa screened potential. Moreover, in this case the pole of the bound-state propagator receives a finite mass shift[108,126] 14.…”

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confidence: 99%

Non-relativistic and potential non-relativistic effective field theories for scalar mediators

Biondini

Shtabovenko

2021

J. High Energ. Phys.

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Yukawa-type interactions between heavy Dirac fermions and a scalar field are a common ingredient in various extensions of the Standard Model. Despite of that, the non-relativistic limit of the scalar Yukawa theory has not yet been studied in full generality in a rigorous and model-independent way. In this paper we intend to fill this gap by initiating a series of investigations that make use of modern effective field theory (EFT) techniques. In particular, we aim at constructing suitable non-relativistic and potential non-relativistic EFTs of Yukawa interactions (denoted as NRY and pNRY respectively) in close analogy to the well known and phenomenologically successful non-relativistic QCD (NRQCD) and potential non-relativistic QCD (pNRQCD). The phenomenological motivation for our study lies in the possibility to explain the existing cosmological observations by introducing heavy fermionic dark matter particles that interact with each other by exchanging a light scalar mediator. A systematic study of this compelling scenario in the framework of non-relativistic EFTs (NREFTs) constitutes the main novelty of our approach as compared to the existing studies.

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“…The chief argument against this picture in the past has been the discrepancy between the observed η/s and that predicted by leadingorder perturbative QCD. At this conference J. Ghiglieri presented a next-to-leading-order calculation of the shear viscosity to entropy density ratio of the QGP, with the results showing a significant reduction in η/s bringing it into range η/s ∼ 0.2, albeit with a large uncertainty associated with both the scale variation and questions about the convergence of the series itself [65]. If nothing else, taken together with the resummed equation of state results [3] this suggests that it may not be completely crazy to extrapolate our understanding of high-temperature QCD down to phenomenologically relevant temperatures.…”

Section: Azimuthal Anisotropies In Hadron Productionmentioning

confidence: 99%

Small system studies: A theory overview

Strickland

2019

Nuclear Physics A

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There is now a substantial body of evidence that a deconfined quark-gluon plasma is created in ultrarelativistic collisions of heavy nuclei. Some key observables which are used to gauge the production of the quark-gluon plasma are the hadronic spectra and multiplicities across many species, azimuthal anisotropies in the production of various hadrons, jet quenching, photon/dilepton production, and heavy quarkonium suppression. A key question in the study of the quarkgluon plasma is what happens to these observables as one changes the system size. In particular, it is very interesting to study collisions of "small systems" such as pp, dA, pA, and e + e − since naively one does not expect to produce a QGP in these cases. One of the surprises from such studies was the existence of sizable azimuthal anisotropies in the hadron spectra in the highest multiplicity classes, which led to speculations that one can generate a QGP in such relatively rare events. This interpretation, however, is complicated by the fact that there can be multiple sources of azimuthal anisotropy. I will discuss our current understanding of the different sources of azimuthal anisotropies and the multiplicity windows in which each mechanism is expected to dominate. I will also provide a critical discussion of the reliability of hydrodynamic models applied to small systems. Finally, I will briefly discuss jet quenching and heavy quarkonium suppression in small systems and discuss whether or not these observables show any indication of the production of a small QGP droplet.

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Review of EFT treatment of quarkonium at finite temperature

Cited by 6 publications

References 44 publications

Coloured coannihilations: dark matter phenomenology meets non-relativistic EFTs

Coloured coannihilations: dark matter phenomenology meets non-relativistic EFTs

Non-relativistic and potential non-relativistic effective field theories for scalar mediators

Small system studies: A theory overview

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