Dark forces coupled to nonconserved currents

Dror, Jeff A.; Lasenby, Robert; Pospelov, Maxim

doi:10.1103/physrevd.96.075036

Cited by 160 publications

(203 citation statements)

References 126 publications

(234 reference statements)

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“…(3.5). It is notable that in the model of gauged baryon number [36] this is achieved without any flavor violation neither in the quark nor the lepton sector, the former being generated by the CKM matrix and the latter by phase space.…”

Section: Model Interpretations Of B → K * Datamentioning

confidence: 99%

“…In other classes of models, this coupling can be induced at one-loop [36], or at tree-level [37,38].…”

Section: Jhep03(2018)188mentioning

confidence: 99%

“…One can also wonder how a direct coupling of the vector to the bs current in Q (4) and Q (4) is possible. Recent studies have shown that these interactions do indeed arise in models where a light V couples to quark currents that are not conserved when the SM mass terms and/or quantum anomaly effects are taken into account [35,36]. Models with direct flavour-universal couplings of V to the axial-vector current of quarks tend to develop Q (4) at one loop, while models with a coupling of V to any linear combination of lepton and baryon currents other than B − L induce Q (4) at the two-loop level.…”

Section: Jhep03(2018)188mentioning

confidence: 99%

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Light resonances and the low-q2 bin of $$ {R}_{K^{*}} $$

Altmannshofer

Harnik

Baker

et al. 2018

J. High Energ. Phys.

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LHCb has reported hints of lepton-flavor universality violation in the rare decays B → K ( * ) + − , both in high-and low-q 2 bins. Although the high-q 2 hint may be explained by new short-ranged interactions, the low-q 2 one cannot. We thus explore the possibility that the latter is explained by a new light resonance. We find that LHCb's central value of R K * in the low-q 2 bin is achievable in a restricted parameter space of new-physics scenarios in which the new, light resonance decays preferentially to electrons and has a mass within approximately 10 MeV of the di-muon threshold. Interestingly, such an explanation can have a kinematic origin and does not require a source of lepton-flavor universality violation. A model-independent prediction is a narrow peak in the differential B → K * e + e − rate close to the di-muon threshold. If such a peak is observed, other observables, such as the differential B → Ke + e − rate and R K , may be employed to distinguish between models. However, if a low-mass resonance is not observed and the low-q 2 anomaly increases in significance, then the case for an experimental origin of the lepton-flavor universality violating anomalies would be strengthened. To further explore this, we also point out that, in analogy to J/ψ decays, e + e − and µ + µ − decays of φ mesons can be used as a cross check of lepton-flavor universality by LHCb with 5 fb −1 of integrated luminosity.

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Section: Model Interpretations Of B → K * Datamentioning

confidence: 99%

“…In other classes of models, this coupling can be induced at one-loop [36], or at tree-level [37,38].…”

Section: Jhep03(2018)188mentioning

confidence: 99%

Section: Jhep03(2018)188mentioning

confidence: 99%

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Light resonances and the low-q2 bin of $$ {R}_{K^{*}} $$

Altmannshofer

Harnik

Baker

et al. 2018

J. High Energ. Phys.

Self Cite

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“…The Z 0 is assumed to be leptophobic; hence, the theory has gauge anomalies, which should be canceled by new chiral fermions which cannot be arbitrarily heavy. Recent development on meson decays via Z 0 [77,78] seem also to put challenging bounds on Λ (see [77]), in which case the fifth force bounds would need to be improved by several order of magnitudes to be competitive on this minimal Z 0 scenario. However, this scenario can be embedded in the framework of next section, in which case experimental constraints from mesons, colliders are relaxed.…”

Section: Appendix A: Uv Completionsmentioning

confidence: 99%

Bounding quantum dark forces

2018

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Dark sectors lying beyond the Standard Model and containing sub-GeV particles which are bilinearly coupled to nucleons would induce quantum forces of the Casimir-Polder type in ordinary matter. Such new forces can be tested by a variety of experiments over many orders of magnitude. We provide a generic interpretation of these experimental searches and apply it to a sample of forces from dark scalars behaving as 1=r 3 , 1=r 5 , 1=r 7 at short range. The landscape of constraints on such quantum forces differs from the one of modified gravity with Yukawa interactions and features, in particular, strong short-distance bounds from molecular spectroscopy and neutron scattering.

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“…This motivates a systematic study of the realizations of these possibilities, with extra SM charged exotics and/or flavor-dependent Z couplings, along the lines of the explicit solutions found in Refs. [63][64][65][66][67][68][69][70][71][72][73][74][75][76][77].…”

mentioning

confidence: 99%

Surprises from complete vector portal theories: New insights into the dark sector and its interplay with Higgs physics

Cui

DʼEramo

2017

Phys. Rev. D

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We study UV complete theories where the Standard Model (SM) gauge group is extended with a new abelian U (1) , and the field content is augmented by an arbitrary number of scalar and fermion SM singlets, potentially including dark matter (DM) candidates. Considerations such as classical and quantum gauge invariance of the full theory and S-matrix unitarity, not applicable within a simplified model approach, are shown to have significant phenomenological consequences. The lack of gauge anomalies leads to compact relations among the U (1) fermion charges, and puts a lower bound on the number of dark fermions. Contrary to naive expectations, the DM annihilation to Zh is found to be p-wave suppressed, as hinted by perturbative unitarity of S-matrix, with dramatic implications for DM thermal relic density and indirect searches. Within this framework, the interplay between dark matter, new vector boson and Higgs physics is rather natural and generic.Introduction. Extra abelian gauge symmetries are among the best motivated extensions to the Standard Model (SM) of particle physics [1]. Spontaneous breaking of such a U (1) symmetry is associated with a massive gauge boson Z that mediates a new type of interaction among SM fields. This Z boson could also provide a portal to the dark matter sector -another robust motivation for physics beyond the SM [2,3]. Extensive studies have pursued this scenario, with simplified models as a commonly employed tool [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Although this approach is advantageous as it allows to study phenomenology with a handful of masses and couplings, some key issues may be missed unless a UV-complete theory is specified.In this paper, we explore the UV-completeness of vector portal models, in particular the implications of the following important theoretical constraints: 1. Classical level gauge invariance of the theory, including the U (1) invariance of SM Yukawa terms. 2. Quantum level gauge invariance of the theory, namely the absence of gauge anomalies. 3. Perturbative unitarity of the S-matrix. These issues, not apparent in a simplified model approach, have profound phenomenological consequences.We focus on U (1) theories where all the new matter fields are SM gauge singlets, and consider an arbitrary number of them. The gauge invariance of the SM Yukawa interactions implies that the SM Higgs doublet H typically carries U (1) charge, unless SM fermions are vector-like under U (1) [24,25]. This in turn implies a deep connection between DM searches and Higgs physics.The cancellation of gauge anomalies is highly nontrivial in a generic U (1) model. Despite the many constraints, we find very compact relations among the dark

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Dark forces coupled to nonconserved currents

Cited by 160 publications

References 126 publications

Light resonances and the low-q2 bin of $$ {R}_{K^{*}} $$

Light resonances and the low-q2 bin of $$ {R}_{K^{*}} $$

Bounding quantum dark forces

Surprises from complete vector portal theories: New insights into the dark sector and its interplay with Higgs physics

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