SUSY-QCD corrections to stop annihilation into electroweak final states including Coulomb enhancement effects

Harz, Julia; Herrmann, Björn; Klasen, M.; Kovařı́k, K.; Meinecke, M.

doi:10.1103/physrevd.91.034012

Cited by 36 publications

(48 citation statements)

References 80 publications

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“…These have to be combined with the real emission of a gluon, which is a correction of the same order and ensures infrared finiteness. At present, the processes covered by the DM@NLO project are [4,5,6,7] χχ → qq ,χq → qH/qV /qg ,qq * → HH/VV /HV , (2.1) been calculated analytically and implemented in a numerical code, which provides the calculation of the annihilation cross-section σ ann including the QCD corrections. On the technical side, we have defined a dedicated renormalization scheme, which is applicable to all the above classes of processes.…”

Section: Review Of Selected Resultsmentioning

confidence: 99%

Predicting the neutralino relic density in the MSSM more precisely

Herrmann¹,

Harz²,

Klasen³

et al. 2017

Proceedings of 38th International Conference on High Energy Physics — PoS(ICHEP2016)

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The dark matter relic density being a powerful observable to constrain models of new physics, the recent experimental progress calls for more precise theoretical predictions. On the particle physics side, improvements are to be made in the calculation of the (co)annihilation cross-section of the dark matter particle. We present the project DM@NLO which aims at calculating the neutralino (co)annihilation cross-section in the MSSM including radiative corrections in QCD. In the present document, we briefly review selected results for different (co)annihilation processes. We then discuss the estimation of the associated theory uncertainty obtained by varying the renormalization scale. Finally, perspectives are discussed.

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Section: Review Of Selected Resultsmentioning

confidence: 99%

Predicting the neutralino relic density in the MSSM more precisely

Herrmann¹,

Harz²,

Klasen³

et al. 2017

Proceedings of 38th International Conference on High Energy Physics — PoS(ICHEP2016)

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“…Using the interactions of the stop and Goldstone bosons found in (3), the dominant s-wave contribution to the thermally-averaged annihilation cross sections are found to be The significance of the Goldstone boson mode was also discussed in [151]. 3 There are also diagrams involving the Goldstone bosons that contribute tot Rt * R → G 0 Z , though their contributions to thet Rt * R → Z Z amplitude are suppressed by a factor of g 2 , and can be neglected for the purposes of this discussion.…”

Section: The Goldstone Equivalence Theorem and Stop Coannihilationmentioning

confidence: 99%

Stop coannihilation in the CMSSM and SubGUT models

Ellis

Evans²,

Luo

et al. 2018

Eur. Phys. J. C

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Stop coannihilation may bring the relic density of heavy supersymmetric dark matter particles into the range allowed by cosmology. The efficiency of this process is enhanced by stop-antistop annihilations into the longitudinal (Goldstone) modes of the W and Z bosons, as well as by Sommerfeld enhancement of stop annihilations and the effects of bound states. Since the couplings of the stops to the Goldstone modes are proportional to the trilinear soft supersymmetry-breaking A-terms, these annihilations are enhanced when the A-terms are large. However, the Higgs mass may be reduced below the measured value if the A-terms are too large. Unfortunately, the interpretation of this constraint on the stop coannihilation strip is clouded by differences between the available Higgs mass calculators. For our study, we use as our default calculator FeynHiggs 2.13.0, the most recent publicly available version of this code. Exploring the CMSSM parameter space, we find that along the stop coannihilation strip the masses of the stops are severely split by the large A-terms. This suppresses the Higgs mass drastically for μ and A 0 > 0, whilst the extent of the stop coannihilation strip is limited for A 0 < 0 and either sign of μ. However, in sub-GUT models, reduced renormalization-group running mitigates the effect of the large A-terms, allowing larger LSP masses to be consistent with the Higgs mass calculation. We give examples where the dark matter particle mass may reach 8 TeV.

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“…As a full discussion of technical details would go beyond the scope of this proceeding, we refer the interested reader to our previous publications [6,7,8,9,10,11,12,13,14] for a detailed discussion and mention mainly the key features of our calculation in a short manner in the following. For renormalising the appearing ultraviolet (UV) divergences we use a hybrid on-shell / DR scheme.…”

Section: Technical Detailsmentioning

confidence: 99%

“…For further details on the calculation, we refer to Ref. [14]. We study the impact of the pure NLO calculation and the resummed Coulomb enhancement effects in example scenario C as given in Tab.1.…”

Section: Stop-antistop Annihilationmentioning

confidence: 99%

“…1 shows an overview of the main relevant classes of processes: (co)annihilation of gauginos (left column), coannihilation of neutralino-stop processes (middle column) and stop-antistop annihilation (right column). Except of stop-antistop annihilation into coloured final states, all processes have been calculated [6,7,8,9,10,11,12,13,14] and their impact on the relic density discussed. In the following, we would like to highlight some of the crucial findings for each of those processes.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Precise Prediction of the Dark Matter Relic Density within the MSSM

Harz¹,

Herrmann²,

Klasen³

et al. 2016

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2015)

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With the latest Planck results the dark matter relic density is determined to an unprecedented precision. In order to reduce current theoretical uncertainties in the dark matter relic density prediction, we have calculated next-to-leading order SUSY-QCD corrections to neutralino (co)annihilation processes including Coulomb enhancement effects. We demonstrate that these corrections can have significant impact on the cosmologically favoured MSSM parameter space and are thus of general interest for parameter studies and global fits.

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SUSY-QCD corrections to stop annihilation into electroweak final states including Coulomb enhancement effects

Cited by 36 publications

References 80 publications

Predicting the neutralino relic density in the MSSM more precisely

Predicting the neutralino relic density in the MSSM more precisely

Stop coannihilation in the CMSSM and SubGUT models

Precise Prediction of the Dark Matter Relic Density within the MSSM

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