Precise yield of high-energy photons from Higgsino dark matter annihilation

Abstract

The impact of electroweak Sudakov logarithms on the endpoint of the photon spectrum for wino dark matter annihilation was studied intensively over the last several years. In this work, we extend these results to Higgsino dark matter χ 0 1 . We achieve NLL' resummation accuracy for narrow and intermediate spectral energy resolutions, of order m 2 W /m χ and m W , respectively. This is the most accurate prediction to date for the yield of high-energy γ-rays from χ 0 1 χ 0 1 → γ + X annihilation for the energy resolutions realized by current and next-generation telescopes. We also discuss for the first time the effect of power corrections in m W /m χ in this context and argue why they are not sizeable.

Sommerfeld-corrected relic abundance of wino dark matter with NLO electroweak potentials

“…Consequently, the fixed-order computations must be complemented by all-order resummation of the dominant logarithmic corrections. This has been achieved for high-energy cosmic photons with the help of soft-collinear effective field theory for the electroweak fermionic triplet ("wino") [27][28][29][30][31] and doublet ("Higgsino") DM model [32]. Overall, the most advanced computations of the high-energy photon yields from DM annihilation reach one to few percent accuracy, depending on the DM mass and model.…”

“…The computations presented here might be extended to more general models, such as the minimal models with general SU(2) electroweak multiplets. Further, it would be interesting to investigate the Higgsino model and DM particles with hypercharge, and combine the NLO potential with the state-of-the-art computations of the high-energy photon spectrum [32], for which the missing NLO correction to the potential is likely to be the current largest theoretical uncertainty.…”

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

“…For recently refined calculations of the present day SM flux in wino and higgsino models, see refs. [35][36][37].…”

NLO electroweak potentials for minimal dark matter and beyond

“…For practical purposes, the results are sufficient to allow an accurate solution of the Schrödinger equation. To validate this statement, we use the higgsino model implemented as discussed in [14]. We find that the accuracy is similar to the wino case [18] with a maximum of two permille deviation at the exact resonance positions and even subpermille accuracies for the Sommerfeld factors off resonance.…”

“…In recent years, the calculation of the annihilation cross-section in DM indirect detection χχ → γ + X has progressed to include electroweak (EW) Sudakov logarithms and their resummation to all orders [6][7][8][9][10][11][12][13][14]. The precision of these calculations has reached the percent level for the wino and Higgsino model, naturally facilitating the question of the size of JHEP10(2021)136 next-to-leading order (NLO) electroweak corrections to the non-relativistic Sommerfeld effect expected to be the dominant source of theoretical uncertainty.…”