Scalar dark matter coannihilating with a coloured fermion

Biondini, Simone

doi:10.1007/jhep11(2019)147

Cited by 37 publications

(41 citation statements)

References 83 publications

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“…By using another formalism valid at high temperature but limited to the assumption of ionization equilibrium, environmental corrections to the upper formula of (5.9) have been studied in the literature [90][91][92][93][94][95]. The method is based on an effective in-medium potential, which shows next to the expected Debye screening mass, a temperature dependent energy shift (Salpeter correction), as well as an imaginary thermal width [96,97].…”

Section: Jhep09(2020)086mentioning

confidence: 99%

Dark matter bound-state formation at higher order: a non-equilibrium quantum field theory approach

Binder

Blobel

Harz

et al. 2020

J. High Energ. Phys.

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The formation of meta-stable dark matter bound states in coannihilating scenarios could efficiently occur through the scattering with a variety of Standard Model bath particles, where light bosons during the electroweak cross over or even massless photons and gluons are exchanged in the t-channel. The amplitudes for those higher-order processes, however, are divergent in the collinear direction of the in- and out-going bath particles if the mediator is massless. To address the issue of collinear divergences, we derive the bound-state formation collision term in the framework of non-equilibrium quantum field theory. The main result is an expression for a more general cross section, which allows to compute higher-order bound-state formation processes inside the primordial plasma background in a comprehensive manner. Based on this result, we show that next-to-leading order contributions, including the bath-particle scattering, are i) collinear finite and ii) generically dominate over the on-shell emission for temperatures larger than the absolute value of the binding energy. Based on a simplified model, we demonstrate that the impact of these new effects on the thermal relic abundance is significant enough to make it worthwhile to study more realistic coannihilation scenarios.

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Section: Jhep09(2020)086mentioning

confidence: 99%

Dark matter bound-state formation at higher order: a non-equilibrium quantum field theory approach

Binder

Blobel

Harz

et al. 2020

J. High Energ. Phys.

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“…As discussed above, the coannihilation of the dark matter S with the VLQs would play a crucial role in explaining the relic density. It has been also shown in [33][34][35][36][37] that the annihilation among the VLQs themselves can give a significant contribution towards the relic density of the DM. The relic density of the DM with mass m S is given by [5]…”

Section: A Methodologymentioning

confidence: 96%

“…1, one can see that the dark matter S can also annihilate into gluon pair (gg) at one loop (through box diagram). It has been shown in [33][34][35][36][37] that with a larger choice of Yukawa coupling (here α) this annihilation of S to the gluon pair can provide a significant contribution to the relic of S. In [34], the authors notice that for the mass regime m S < m t with the Yukawa coupling of ∼Oð10Þ the correct relic density can be satisfied. This large Yukawa coupling (involving upquark) however can create a problem in the DD of the dark matter as it will generate a large spin independent cross section and hence can be on the verge of being excluded by the DD searches.…”

Section: Combined Analysis Of Dm and Ew Vacuum Stabilitymentioning

confidence: 99%

“…Study of such scalar singlet DM has been extended in different directions where additional portal couplings of the scalar are engaged on top of the usual Higgs portal interaction. One such possibility is to include DM portal couplings with new vectorlike leptons [26][27][28][29][30][31][32] and quarks [33][34][35][36][37]. The interesting feature that came out of these studies is the presence of radiative corrections that not only affects the DM annihilations significantly but also leads to interesting observations for DM indirect searches.…”

Section: Introductionmentioning

confidence: 99%

“…This contribution affecting the relic abundance (to some extent) gets decoupled from the ones giving rise to tree level spin independent DM-nucleon scattering and hence DM with mass below 1 TeV is expected to be revived. Although phenomenological implications of such a setup have already been addressed elsewhere from different perspectives [26][27][28][29][30][31][32][33][34][35][36][37], here we have one more motivation and that is to ensure the stability of electroweak vacuum all the way up to the Planck scale. The idea emerges from a recent observation [39] that, though we know fermions coupling to the Higgs contribute negatively to the RG running of quartic coupling λ H in general, the presence of VLQs can actually affect the SUð3Þ gauge coupling in such a way which in turn is useful in keeping λ H positive at all scales.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sub-TeV singlet scalar dark matter and electroweak vacuum stability with vectorlike fermions

2020

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We study a scalar singlet dark matter (DM) having mass in the sub-TeV regime by extending the minimal scalar singlet DM setup by additional vectorlike fermions. While the minimal scalar singlet DM satisfies the relic and direct detection constraints for mass beyond TeV only, presence of its portal coupling with vectorlike fermions opens up additional coannihilation channels. These vectorlike fermions also help in achieving electroweak vacuum stability all the way up to Planck scale. We find that for one generation of vectorlike quarks consisting of a SUð2Þ L doublet and a singlet, scalar singlet DM with mass a few hundred GeV can indeed satisfy relic, direct detection and other relevant constraints while also making the electroweak vacuum absolutely stable. The same can be achieved by introducing vectorlike leptons too, but with three generations. While the model with vectorlike quarks is minimal, the three generations of vectorlike lepton doublet and neutral singlet can also give rise to light neutrino mass at one loop level.

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Coupled Boltzmann transport equations of heavy quarks and quarkonia in quark-gluon plasma

Yao

et al. 2021

J. High Energ. Phys.

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We develop a framework of coupled transport equations for open heavy flavor and quarkonium states, in order to describe their transport inside the quark-gluon plasma. Our framework is capable of studying simultaneously both open and hidden heavy flavor observables in heavy-ion collision experiments and can account for both, uncorrelated and correlated recombination. Our recombination implementation depends on real-time open heavy quark and antiquark distributions. We carry out consistency tests to show how the interplay among open heavy flavor transport, quarkonium dissociation and recombination drives the system to equilibrium. We then apply our framework to study bottomonium production in heavy-ion collisions. We include ϒ(1S), ϒ(2S), ϒ(3S), χb(1P) and χb(2P) in the framework and take feed-down contributions during the hadronic gas stage into account. Cold nuclear matter effects are included by using nuclear parton distribution functions for the initial primordial heavy flavor production. A calibrated 2 + 1 dimensional viscous hydrodynamics is used to describe the bulk QCD medium. We calculate both the nuclear modification factor RAA of all bottomonia states and the azimuthal angular anisotropy coefficient v2 of the ϒ(1S) state and find that our results agree reasonably with experimental measurements. Our calculations indicate that correlated cross-talk recombination is an important production mechanism of bottomonium in current heavy-ion experiments. The importance of correlated recombination can be tested experimentally by measuring the ratio of RAA(χb(1P)) and RAA(ϒ(2S)).

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Scalar dark matter coannihilating with a coloured fermion

Cited by 37 publications

References 83 publications

Dark matter bound-state formation at higher order: a non-equilibrium quantum field theory approach

Dark matter bound-state formation at higher order: a non-equilibrium quantum field theory approach

Sub-TeV singlet scalar dark matter and electroweak vacuum stability with vectorlike fermions

Coupled Boltzmann transport equations of heavy quarks and quarkonia in quark-gluon plasma

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