On the Uncertainty Evaluation for Repeated Measurements

Fernández, Manuel Solaguren-Beascoa; Ortega-López, Vanesa; López, Roberto Serrano

doi:10.1007/s12647-013-0057-x

Cited by 11 publications

(5 citation statements)

References 10 publications

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“…New heavy neutral gauge bosons, Z , appear in many gauge extensions of the Standard Model (SM). In particular, in certain models these additional gauge bosons are responsible for linking the dark and visible sector [53][54][55][56][57][58][59][60][61] producing a so-called Z "portal". In this work we aim to investigate this setup under three different perspectives: direct, indirect and collider searches.…”

Section: A Z Portal Dark Matter Modelmentioning

confidence: 99%

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The dark Z′ portal: direct, indirect and collider searches

Alves

Profumo

Queiroz

2014

J. High Energ. Phys.

172

159

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We perform a detailed study of the dark Z portal using a generic parametrization of the Z -quarks couplings, both for light (8−15) GeV and heavy (130−1000) GeV dark matter scenarios. We present a comprehensive study of the collider phenomenology including jet clustering, hadronization, and detector artifacts, which allows us to derive accurate bounds from the search for new resonances in dijet events and from mono-jet events in the LHC 7 TeV, LHC 8 TeV, and Tevatron 1.96 TeV data. We also compute the dark matter relic abundance, the relevant scattering cross sections and pair-annihilation spectrum, and compare our results with the current PLANCK, Fermi-LAT and XENON100/LUX bounds. Lastly, we highlight the importance of complementary searches for dark matter, and outline the excluded versus still viable parameter space regions of the dark Z portal.

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Section: A Z Portal Dark Matter Modelmentioning

confidence: 99%

“…Note that the argument above fails in theories where the vector coupling is extremely suppressed compared to the vector-axial coupling. The vector and axial couplings might be different, as it happens in many models, but they would presumably not differ by orders of magnitude [53][54][55][56][57][58][59][60][61].…”

Section: Direct Detectionmentioning

confidence: 99%

The dark Z′ portal: direct, indirect and collider searches

Alves

Profumo

Queiroz

2014

J. High Energ. Phys.

172

159

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“…in agreement with the results given in Refs. [27,28,29]. 1 According to the latest results from Planck Collaboration, the effective number of neutrino generations is determined to be [19] N eff = 3.14 +0.44 −0.43 , He + Planck TT + lowP + BAO ,…”

Section: Cosmological Constraintsmentioning

confidence: 99%

“…After finishing this work, we became aware of Refs. [27,28,29], where the right-handed neutrinos as dark radiation have been discussed in a U (1) gauge model with a heavy Z ′ gauge boson.…”

Section: Note Addedmentioning

confidence: 99%

Relic right-handed Dirac neutrinos and implications for detection of cosmic neutrino background

Zhang

Zhou

2016

Nuclear Physics B

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It remains to be determined experimentally if massive neutrinos are Majorana or Dirac particles. In this connection, it has been recently suggested that the detection of cosmic neutrino background of left-handed neutrinos ν L and right-handed antineutrinos ν R in future experiments of neutrino capture on beta-decaying nuclei (e.g., ν e + 3 H → 3 He+e − for the PTOLEMY experiment) is likely to distinguish between Majorana and Dirac neutrinos, since the capture rate is twice larger in the former case. In this paper, we investigate the possible impact of right-handed neutrinos on the capture rate, assuming that massive neutrinos are Dirac particles and both right-handed neutrinos ν R and left-handed antineutrinos ν L can be efficiently produced in the early Universe. It turns out that the capture rate can be enhanced at most by 28% due to the presence of relic ν R and ν L with a total number density of 95 cm −3 , which should be compared to the number density 336 cm −3 of cosmic neutrino background. The enhancement has actually been limited by the latest cosmological and astrophysical bounds on the effective number of neutrino generations N eff = 3.14 +0.44 −0.43 at the 95% confidence level. For illustration, two possible scenarios have been proposed for thermal production of right-handed neutrinos in the early Universe.PACS number(s): 14.60. St, 95.35.+d, 98.70.Vc Although a number of elegant neutrino oscillation experiments in the past few decades have well established that neutrinos are massive particles, it is still unclear whether massive neutrinos are of Dirac or Majorana nature [1,2]. Thus far, tremendous efforts have been placed on the experimental searches for neutrinoless double-beta (0νββ) decays, which take place only if lepton number violation exists and massive neutrinos are Majorana particles [3,4,5,6]. The experimental discovery of 0νββ decays will provide us with a robust evidence for Majorana neutrinos. However, in case that 0νββ decays are not detected in all the future 0νββ experiments, it is still possible that neutrinos are Majorana particles, if neutrino mass ordering is normal (i.e., m 1 < m 2 < m 3 ) and an intricate cancellation occurs in the effective neutrino mass relevant for 0νββ decays (see, e.g., Ref. [7]). In this case, another independent approach should be utilized to probe the Dirac or Majorana nature of massive neutrinos.More than fifty years ago, Weinberg pointed out [8] that the cosmic neutrino background (CνB) predicted by the standard Big Bang theory of cosmology can be detected via neutrino capture on betadecaying nuclei, e.g., ν e + 3 H → 3 He + e − . This possibility has been extensively studied in many recent works [9,10,11,12,13,14]. In particular, for the future experiment PTOLEMY [15] with 100 grams of tritium, the capture rate Γ(ν e + 3 H → 3 He + e − ) has been found to be [14]

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“…To develop our program in the simplest way, we follow [46][47][48][49][50] and make use of extra U (1) symmetries embedded in a grand unified exceptional E 6 group, with breaking pattern…”

Section: A Theoretical Considerationsmentioning

confidence: 99%

Reconciling BICEP2 and Planck results with right-handed Dirac neutrinos in the fundamental representation of grand unifiedE₆

Anchordoqui

Goldberg

Huang

et al. 2014

J. Cosmol. Astropart. Phys.

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The tensor-to-scalar ratio (r = 0.20 +0.07 −0.05 ) inferred from the excess B-mode power observed by the Background Imaging of Cosmic Extragalactic Polarization (BICEP2) experiment is almost twice as large as the 95% CL upper limits derived from temperature measurements of the WMAP (r < 0.13) and Planck (r < 0.11) space missions. Very recently, it was suggested that additional relativistic degrees of freedom beyond the three active neutrinos and photons can help to relieve this tension: the data favor an effective number of light neutrino species N eff = 3.86 ± 0.25. Since the BICEP2 ratio implies the energy scale of inflation (V

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On the Uncertainty Evaluation for Repeated Measurements

Cited by 11 publications

References 10 publications

The dark Z′ portal: direct, indirect and collider searches

The dark Z′ portal: direct, indirect and collider searches

Relic right-handed Dirac neutrinos and implications for detection of cosmic neutrino background

Reconciling BICEP2 and Planck results with right-handed Dirac neutrinos in the fundamental representation of grand unifiedE₆

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On the Uncertainty Evaluation for Repeated Measurements

Cited by 11 publications

References 10 publications

The dark Z′ portal: direct, indirect and collider searches

The dark Z′ portal: direct, indirect and collider searches

Relic right-handed Dirac neutrinos and implications for detection of cosmic neutrino background

Reconciling BICEP2 and Planck results with right-handed Dirac neutrinos in the fundamental representation of grand unifiedE6

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Product

Resources

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Reconciling BICEP2 and Planck results with right-handed Dirac neutrinos in the fundamental representation of grand unifiedE₆