Weitere Modellierungsansätze

Toma, Alina

doi:10.1007/978-3-658-04684-2_9

Cited by 5 publications

(23 citation statements)

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“…The r-dependences are very similar, but the signal from S is comparatively larger compared to the χ and N scenarios, respectively by a factor 8 and 8/(1 + 1/2r 2 ) 2 . This, combined with the previous feature, implies that the Bremsstrahlung is potentially much stronger in the S scenario, although the spectra are the same [8,9]. This is illustrated in Fig.…”

Section: Discussion Of Resultsmentioning

confidence: 64%

“…where the first term is from the 2 transverse polarization modes and the second term from the longitudinal one. As emphasized in [8,9], all things being taken to be the same (i.e. DM and mediator masses and the couplings), the 3-body cross section is larger by a factor of 8 in scenario 3 compared to scenario 1.…”

Section: Spectral Energy Density: Internal Bremsstrahlungmentioning

confidence: 99%

“…They share the same spectra, with quasi the same parametric dependence in the couplings and mass of DM and of the mediator of the normalization of the 2 and 3-body processes. The scalar case is distinct, in the sense that if the relic abundance is thermal and is fixed by the 2-body annihilation process, then the signal is stronger for the scalar case (by a factor which may be as large as 2 orders of magnitude) [8,9]. If we relax the latter constraint (for instance if the abundance is fixed by another process), then the 3 scenarios become indistinguishable.…”

Section: Spectral Energy Density: Internal Bremsstrahlungmentioning

confidence: 99%

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Bremsstrahlung and gamma ray lines in 3 scenarios of dark matter annihilation

Giacchino

Lopez-Honorez

Tytgat

2014

J. Cosmol. Astropart. Phys.

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Gamma ray spectral features are of interest for indirect searches of dark matter (DM). Following Barger et al we consider 3 simple scenarios of DM that annihilates into Standard Model (SM) fermion pairs. Scenario 1 is a Majorana DM candidate coupled to a charged scalar, scenario 2 is a Majorana DM coupled to a charged gauge boson and scenario 3 is a real scalar DM coupled a charged vector-like fermion. As shown by Barger et al, these 3 scenarios share precisely the same internal Bremsstrahlung spectral signature into gamma rays. Their phenomenology is however distinct. In particular for annihilation into light SM fermions, in the chiral limit, the 2-body annihilation cross section is p-wave suppressed for the Majorana candidates while it is d-wave suppressed for the real scalar. In the present work we study the annihilation into 2 gammas, showing that these three scenarios have distinct, and so potentially distinguishable, spectral signatures into gamma rays. In the case of the real scalar candidate we provide a new calculation of the amplitude for annihilation into 2 gammas.

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Section: Discussion Of Resultsmentioning

confidence: 64%

Section: Spectral Energy Density: Internal Bremsstrahlungmentioning

confidence: 99%

Section: Spectral Energy Density: Internal Bremsstrahlungmentioning

confidence: 99%

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Bremsstrahlung and gamma ray lines in 3 scenarios of dark matter annihilation

Giacchino

Lopez-Honorez

Tytgat

2014

J. Cosmol. Astropart. Phys.

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“…The sharp spectral features arise mainly from the annihilation final states uūγ and γγ (the contribution to the total spectrum from γZ is a factor tan 2 θ W 0.30 smaller and will be neglected here). The photon multiplicities are analogous to those produced when the dark matter couples to a lepton, which were discussed in [23,24,26,27]. The final state uūγ gives the dominant contribution to the energy spectrum when the scalar DM and the fermion mediator are very close in mass, while γγ is more important in the opposite case; for intermediate regimes, the spectrum will be a linear combination of these two, weighted by the corresponding branching fractions.…”

Section: Indirect Detection Constraintsmentioning

confidence: 90%

Signatures from scalar dark matter with a vector-like quark mediator

Giacchino

Ibarra

Lopez-Honorez

et al. 2016

J. Cosmol. Astropart. Phys.

117

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We present a comprehensive study of a model where the dark matter is composed of a singlet real scalar that couples to the Standard Model predominantly via a Yukawa interaction with a light quark and a colored vector-like fermion. A distinctive feature of this scenario is that thermal freeze-out in the early universe may be driven by annihilation both into gluon pairs at one-loop (gg) and by virtual internal Bremsstrahlung of a gluon (qqg). Such a dark matter candidate may also be tested through direct and indirect detection and at the LHC; viable candidates have either a mass nearly degenerate with that of the fermionic mediator or a mass above about 2 TeV.

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“…Virtual internal Bremsstrahlung (VIB) from the dark lepton L + lifts the kinematic suppression, so that annihilation proceeds through an s−wave [49,53]. The thermally averaged cross section for this process is [54] …”

Section: Dark Matter Relic Abundancementioning

confidence: 99%

Dark matter relic from muon anomalies

2015

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We show that the recently reported anomalies in b → sµ + µ − transitions, as well as the longstanding gµ − 2 discrepancy, can be addressed simultaneously by a new massive abelian gauge boson with loop-induced coupling to muons. Such a scenario typically leads to a stable dark matter candidate with a thermal relic density close to the observed value. Dark matter in our model couples dominantly to leptons, hence signals in direct detection experiments lie well below the current sensitivity. The LHC, in combination with indirect detection searches, can test this scenario through distinctive signatures with muon pairs and missing energy.

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Weitere Modellierungsansätze

Cited by 5 publications

References 0 publications

Bremsstrahlung and gamma ray lines in 3 scenarios of dark matter annihilation

Bremsstrahlung and gamma ray lines in 3 scenarios of dark matter annihilation

Signatures from scalar dark matter with a vector-like quark mediator

Dark matter relic from muon anomalies

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