Neutrino-dark matter connections in gauge theories

Pérez, P.; Murgui, Clara; Plascencia, Alexis D.

doi:10.1103/physrevd.100.035041

Cited by 47 publications

(17 citation statements)

References 77 publications

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“…A similar limit was recently derived in Ref. [51]. For masses MeV < M Z 10 GeV the limit becomes much stronger due to the s-channel resonance of the rate, or equivalently the efficient inverse decay of Z .…”

Section: A U (1)b−l and Other Gauge Bosonssupporting

confidence: 80%

Observing Dirac neutrinos in the cosmic microwave background

Abazajian

Heeck

2019

Phys. Rev. D

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Planned CMB Stage IV experiments have the potential to measure the effective number of relativistic degrees of freedom in the early Universe, N eff , with percent-level accuracy. This probes new thermalized light particles and also constrains possible new-physics interactions of Dirac neutrinos. Many Dirac-neutrino models that aim to address the Dirac stability, the smallness of neutrino masses or the matter-anti-matter asymmetry of our Universe endow the right-handed chirality partners νR with additional interactions that can thermalize them. Unless the reheating temperature of our Universe was low, this leads to testable deviations in N eff . We discuss well-motivated models for νR interactions such as gauged U (1)B−L and the neutrinophilic two-Higgs-doublet model, and compare the sensitivity of SPT-3G, Simons Observatory, and CMB-S4 to other experiments, in particular the LHC.

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Section: A U (1)b−l and Other Gauge Bosonssupporting

confidence: 80%

Observing Dirac neutrinos in the cosmic microwave background

Abazajian

Heeck

2019

Phys. Rev. D

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“…Using the approximation formulas in Eq. (17), this behavior can be qualitatively understood as follows: In the first case, for x ≲ 1, we have hσvi ∝ g 2 ζ g 2 BL ðx 2 =m 2 ζ Þ, and Eq. (8) can easily be solved with Y ≪ Y EQ ≃ constant and Yðx RH ≪ 1Þ ¼ 0.…”

Section: A Dark Matter Relic Densitymentioning

confidence: 93%

“…See Refs. [17,18] for the case where the two mass parameters are in the multi-TeV range. We keep the masses arbitrary and find constraints on them in our model.…”

Section: Introductionmentioning

confidence: 99%

Dark matter constraints on low mass and weakly coupled B−L gauge boson

Mohapatra

Okada

2020

Phys. Rev. D

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We investigate constraints on the new B − L gauge boson (Z BL) mass and coupling (g BL) in a Uð1Þ B−L extension of the standard model (SM) with an SM singlet Dirac fermion (ζ) as dark matter (DM). The DM particle ζ has an arbitrary B − L charge Q chosen to guarantee its stability. We focus on the small Z BL mass and small g BL regions of the model, and find new constraints for the cases where the DM relic abundance arises from thermal freeze-out as well as freeze-in mechanisms. In the thermal freeze-out case, the dark matter coupling is given by g ζ ≡ g BL Q ≃ 0.016 ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi m ζ ½GeV p to reproduce the observed DM relic density and g BL ≥ 2.7 × 10 −8 ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi m ζ ½GeV p for the DM particle to be in thermal equilibrium prior to freeze-out. Combined with the direct dark matter detection constraints and the indirect constraints from cosmic microwave background and AMS-02 measurements, discussed in earlier papers, we find that the allowed mass regions are limited to be m ζ ≳ 200 GeV and M Z BL ≳ 10 GeV. We then discuss the lower g BL values where the freeze-in scenario operates and find the following relic density constraints on parameters depending on the g BL range and dark matter mass: Case (A): for g BL ≥ 2.7 × 10 −8 ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi m ζ ½GeV p , one has g 2 ζ g 2 BL þ 0.82 1.2 g 4 ζ ≃ 8.2 × 10 −24 ; and Case (B): for g BL < 2.7 × 10 −8 ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi m ζ ½GeV p , there are two separate constraints depending on m ζ. Case (B1): for m ζ ≲ 2.5 TeV, we find g 2 ζ g 2 BL ≃ 8.2 × 10 −24 ð m ζ 2.5 TeV Þ; and Case (B2): for m ζ ≳ 2.5 TeV, we have g 2 ζ g 2 BL ≃ 8.2 × 10 −24. For this case, we display the various parameter regions of the model that can be probed by a variety of "Lifetime Frontier" experiments such as FASER, FASER2, Belle II, SHiP, and LDMX.

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“…In fact, CMB-S4 will be able to probe a much larger region of W R and Z R masses out of existing collider reach and, hence, can probe or rule out the minimal model. Since there have been a few recent studies on the gauged B − L model with light Dirac neutrinos [46][47][48][49] and corresponding constraints due to the Planck 2018 bound on ΔN eff , we also reproduce the corresponding parameter space in the gauged B − L model and compare with the one obtained in the DLRM. We point out the important difference due to the restricted range of DLRM gauge couplings g R and g BL unlike that in the gauged B − L model.…”

Section: Introductionmentioning

confidence: 99%

Observing left-right symmetry in the cosmic microwave background

et al. 2020

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We consider the possibility of probing the left-right symmetric model (LRSM) via the cosmic microwave background (CMB). We adopt the minimal LRSM with Higgs doublets, also known as the doublet leftright model (DLRM), where all fermions including the neutrinos acquire masses only via their couplings to the Higgs bidoublet. Because of the Dirac nature of light neutrinos, there exist additional relativistic degrees of freedom which can thermalize in the early Universe by virtue of their gauge interactions corresponding to the right sector. We constrain the model from Planck 2018 bound on the effective relativistic degrees of freedom and also estimate the prospects for planned CMB stage IV experiments to constrain the model further. We find that the W R boson mass below 4.06 TeV can be ruled out from the Planck 2018 bound at 2σ C.L. in the exact left-right symmetric limit which is equally competitive as the LHC bounds from dijet resonance searches. On the other hand, the Planck 2018 bound at 1σ C.L. can rule out a much larger parameter space out of reach of present direct search experiments, even in the presence of additional relativistic degrees of freedom around the TeV corner. We also study the consequence of these constraints on dark matter in the DLRM by considering a right-handed real fermion quintuplet to be the dominant dark matter component in the Universe.

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Neutrino-dark matter connections in gauge theories

Cited by 47 publications

References 77 publications

Observing Dirac neutrinos in the cosmic microwave background

Observing Dirac neutrinos in the cosmic microwave background

Dark matter constraints on low mass and weakly coupled B−L gauge boson

Observing left-right symmetry in the cosmic microwave background

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