Energetic γ-rays from TeV scale dark matter annihilation resummed

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

“…The indices are ordered in the following way: (11), (22) and (+−). We added the contribution of the mass-splitting matrix δm IJ .…”

“…Since there are no conceptual differences with respect to the resummation in the wino DM case, we refer to [23] for an in depth discussion of the systematics of resummation and will keep the present discussion rather brief. Also, all function definitions have already been presented in [22] and [23] and will not be repeated here.…”

“…The χ 0 1 χ 0 2 state is not relevant, since the χ 0 1 χ 0 1 , χ 0 2 χ 0 2 and χ + χ − states cannot scatter into χ 0 1 χ 0 2 prior to the annihilation. Since the matrix Γ IJ is not dependent on the mass splittings δm and δm N at the NLL' accuracy investigated here, the annihilation matrix fulfils the following properties: Γ (22) (11) . The matrix Γ IJ has a slightly more complicated structure than for the wino [23] because of the non-vanishing hypercharge of the Higgsino multiplet.…”

“…In recent papers we [22,23] and others [17][18][19][20][21] discussed these effects for the pure electroweak Majorana triplet model (wino-like neutralino) [24]. In those papers we established factorization formulas and obtained precise predictions for the photon yield for two different telescope energy-resolution regimes by using SCET methods [25][26][27][28].…”

“…There are three non-relativistic particle-pair indices I and J relevant for χ 0 1 χ 0 1 → γ+X annihilation. Concretely, I, J = (11), (22), (+−) where the indices (11) and (22) refer to the χ 0 1 χ 0 1 and χ 0 2 χ 0 2 two-particle states, respectively, and the remaining index (+−) labels the chargino particle-antiparticle pair. The χ 0 1 χ 0 2 state is not relevant, since the χ 0 1 χ 0 1 , χ 0 2 χ 0 2 and χ + χ − states cannot scatter into χ 0 1 χ 0 2 prior to the annihilation.…”