Relic density computations at NLO: infrared finiteness and thermal correction

Beneke, Μ.; Dighera, Francesco; Hryczuk, Andrzej

doi:10.48550/arxiv.1409.3049

Cited by 8 publications

(20 citation statements)

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“…This has also been observed in Ref. [4] where the IR finiteness of such a theory of dark matter was shown to next-to-leading order (NLO).…”

Section: Emission and Absorption Of Real Photonssupporting

confidence: 72%

“…Indeed, Ref. [4] showed the isolation and cancellation of infra-red divergences to NLO and calculated the corresponding infra-red finite cross sections in the thermal theory. Our aim was more ambitious in that we wanted to establish the all-order infrared finiteness of such theories.…”

Section: Discussionmentioning

confidence: 99%

“…Initial efforts to include thermal corrections to the relevant processes were made in Ref. [4], wherein it was shown, albeit to only the next-to-leading order (NLO), that infra-red divergences (both soft and collinear) cancel out in processes involving both charged scalars and charged fermions. However, no proof to all orders exists so far and we provide one in this paper.…”

Section: Introductionmentioning

confidence: 99%

“…We assume that the bino is a TeV scale DM particle so that freeze-out occurs after the electroweak transition; hence, only electromagnetic interactions are relevant for the IR finiteness at these scales 4 . In other words, the χ interacts only with fermions and sfermions, f and φ,…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Infrared finiteness of theories with bino-like dark matter at finite temperature

Sen,

Indumathi,

Choudhury

2018

Preprint

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Models incorporating moderately heavy dark matter (DM) typically need charged (scalar) fields to establish admissible relic densities. Since the DM freezes out at an early epoch, thermal corrections to the cross sections can be important. In a companion paper [1] we established that the infrared (IR) divergences accruing from scalar-photon interactions cancel to all orders in perturbation theory. The corresponding infrared finiteness of thermal fermionic QED has already been established. Here, we study the IR behaviour at finite temperatures, of a theory of dark matter interacting with charged scalars and fermions, which potentially contains both both linear and sub-leading logarithmic divergences. We prove that the theory is IR-finite to all orders with the divergences cancelling when both absorption and emission of photons from and into the heat bath are taken into account. While 4-point interaction terms are known to be IR finite, their inclusion leads to a neat exponentiation. The calculation follows closely the technique used for the scalar finite temperature theory.

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“…This has also been observed in Ref. [4] where the IR finiteness of such a theory of dark matter was shown to next-to-leading order (NLO).…”

Section: Emission and Absorption Of Real Photonssupporting

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Infrared finiteness of theories with bino-like dark matter at finite temperature

Sen,

Indumathi,

Choudhury

2018

Preprint

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“…As derived in ref. [71], the DM collision term in the forward direction can be determined through the DM self-energy component Σ −+ . In the 1-PI formalism, the Σ −+ contains interacting D −+ µν .…”

Section: Discussionmentioning

confidence: 99%

Rapid Bound State Formation of Dark Matter in the Early Universe

2020

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The thermal decoupling description of dark matter (DM) and co-annihilating partners is reconsidered. If DM is realized at around the TeV-mass region or above, even the heaviest electroweak force carriers could act as long-range forces, leading to the existence of meta-stable DM bound states. The formation and subsequent decay of the latter further deplete the relic density during the freeze-out process on top of the Sommerfeld enhancement, allowing for larger DM masses. While so far the bound-state formation was described via the emission of an on-shell mediator (W ± , Z, H, g, photon or exotic), we point out that this particular process does not have to be the dominant scattering-bound state conversion channel in general. If the mediator is coupled in a direct way to any relativistic species present in the Early Universe, the bound-state formation can efficiently occur through particle scattering, where a mediator is exchanged virtually. To demonstrate that such a virtually stimulated conversion process can dominate the on-shell emission even for all temperatures, we analyze a simplified model where DM is coupled to only one relativistic species in the primordial plasma through an electroweak-scale mediator. We find that the bound-state formation cross section via particle scattering can exceed the on-shell emission by up to several orders of magnitude.

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Unitarity and CP violation in leptogenesis at NLO: general considerations and top Yukawa contributions

Racker

2019

J. High Energ. Phys.

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With an emphasis on unitarity and CPT requirements, we study the inclusion of CP-violating processes in baryogenesis at next-to-leading order, particularly those involving the top Yukawa interaction in leptogenesis. We show that there are more contributions than previously considered, but also important cancellations. Some of these involve the interference of connected with disconnected diagrams. We also discuss on the application of the Kinoshita-Lee-Nauenberg theorem to treat the infrared divergences that are common at next-to-leading order. Finally, we calculate the CP asymmetry in the three-body decay of a sterile neutrino into a lepton and top quarks.

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Relic density computations at NLO: infrared finiteness and thermal correction

Cited by 8 publications

References 0 publications

Infrared finiteness of theories with bino-like dark matter at finite temperature

Infrared finiteness of theories with bino-like dark matter at finite temperature

Rapid Bound State Formation of Dark Matter in the Early Universe

Unitarity and CP violation in leptogenesis at NLO: general considerations and top Yukawa contributions

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