A non-universal $U(1)_{X}$ extension to the Standard Model to study the $B$ meson anomaly and muon $g-2$

Alvarado, J. S.; Mantilla, S. F.; Martinez, R.; Ochoa, F.

doi:10.48550/arxiv.2105.04715

Cited by 3 publications

(7 citation statements)

References 26 publications

(29 reference statements)

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“…there are really only three non-equivalent amplitudes in this study: [12][34], [13][24] and [14] Λ 2 factor to be included. The R, L indices refer to chiralities.…”

Section: Helicity Amplitudesmentioning

confidence: 99%

“…lequ , Q leqd3 and the σ ++ contribution of Q T le generate the same amplitude [13][24] + [14] [23]. Except for the v 4 /(4Λ 4 ) additional factor the cross sections are equal.…”

Section: Cross Sections and Limits On Coefficientsmentioning

confidence: 99%

“…Except for the v 4 /(4Λ 4 ) additional factor the cross sections are equal. However, for the σ +− helicity mode the Q T le amplitude is [21][34] + [14] [23]. In the Center-of-Momentum (CM) frame the functional dependence on the p 3 polar angle's cos θ is: [13][24] + [14][23] ∼ cos θ.…”

Section: Cross Sections and Limits On Coefficientsmentioning

confidence: 99%

“…However, for the σ +− helicity mode the Q T le amplitude is [21][34] + [14] [23]. In the Center-of-Momentum (CM) frame the functional dependence on the p 3 polar angle's cos θ is: [13][24] + [14][23] ∼ cos θ. If we compare with [21][34] + [14][23] ∼ (3 + cos θ)/2 we can see that the latter yields a much greater cross section.…”

Section: Cross Sections and Limits On Coefficientsmentioning

confidence: 99%

“…Blue lines: signal process (10), black line: analytical expression (8), orange lines: background process (11), green lines: background process (12). All distributions correspond to detector-level events with the cuts (14).…”

Section: Tablementioning

confidence: 99%

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Two-to-two processes at an electron-muon collider

Bouzas

Larios

2021

Preprint

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Based on a recent proposal to build an electron-muon collider, we study two-to-two production processes e − µ + → f f , γγ that originate from dimension 6 and 8 operators. We compare the sensitivity to those effective couplings obtained at the collider with that of low energy measurements of µ → eγ, µ → eēe and µ → e conversion that have recently been reported in the literature. Whereas for the production of first family fermions the sensitivity of the collider processes is much weaker, for the second and third familiy fermions it is similar or stronger than that of low-energy processes. In the case of e − µ + → γγ, the sensitivity to a dimension 8 contact operator turns out to be the strongest in comparison.

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“…there are really only three non-equivalent amplitudes in this study: [12][34], [13][24] and [14] Λ 2 factor to be included. The R, L indices refer to chiralities.…”

Section: Helicity Amplitudesmentioning

confidence: 99%

“…lequ , Q leqd3 and the σ ++ contribution of Q T le generate the same amplitude [13][24] + [14] [23]. Except for the v 4 /(4Λ 4 ) additional factor the cross sections are equal.…”

Section: Cross Sections and Limits On Coefficientsmentioning

confidence: 99%

Section: Cross Sections and Limits On Coefficientsmentioning

confidence: 99%

Section: Cross Sections and Limits On Coefficientsmentioning

confidence: 99%

Section: Tablementioning

confidence: 99%

See 3 more Smart Citations

Two-to-two processes at an electron-muon collider

Bouzas

Larios

2021

Preprint

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From Peccei Quinn symmetry to mass hierarchy problem

Garnica¹,

Mantilla²,

Martı́nez³

2021

J. Phys. G: Nucl. Part. Phys.

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We propose a non-universal U(1) X gauge extension to the standard model (SM) and an additional Peccei–Quinn (PQ) global symmetry to study the mass hierarchy and strong CP problem. The scheme allows us to distinguish among fermion families and to generate the fermionic mass spectrum of particles of the SM. The symmetry breaking is performed by two scalar Higgs doublets and two scalar Higgs singlets, where one of these has the axion which turns out to be a candidate for cold dark matter. The exotic sector is composed by one up-like T and two down-like J 1,2 heavy quarks, two heavy charged leptons , one additional right-handed neutrino per family , and an invisible axion a. In addition, the large energy scale associated to the breaking of the PQ-symmetry gives masses to the right-handed neutrinos in such a way that the active neutrinos acquire eV-mass values due to the see-saw mechanism. On the other hand, from the non-linear effective Lagrangian, the flavour changing of the down quarks and charged leptons with the axion are considered.

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Explaining $g_μ-2$ and $R_{K^{(*)}}$ using the light mediators of $U(1)_{T3R}$

Dutta,

Ghosh,

Huang

et al. 2021

Preprint

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Scenarios in which right-handed light Standard Model fermions couple to a new gauge group, U (1)T 3R can naturally generate a sub-GeV dark matter candidate. But such models necessarily have large couplings to the Standard Model, generally yielding tight experimental constraints. We show that the contributions to gµ − 2 from the dark photon and dark Higgs largely cancel out in the narrow window where all the experimental constraints are satisfied, leaving a net correction which is consistent with recent measurements from Fermilab. These models inherently violate lepton universality, and UV completions of these models can include quark flavor violation which can explain R K ( * ) anomalies as observed at the LHCb experiment after satisfying constraints on Br(Bs → µµ) and various other constraints in the allowed parameter space of the model. This scenario can be probed by FASER, SeaQuest, SHiP, LHCb, Belle, etc.

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A non-universal $U(1)_{X}$ extension to the Standard Model to study the $B$ meson anomaly and muon $g-2$

Cited by 3 publications

References 26 publications

Two-to-two processes at an electron-muon collider

Two-to-two processes at an electron-muon collider

From Peccei Quinn symmetry to mass hierarchy problem

Explaining $g_μ-2$ and $R_{K^{(*)}}$ using the light mediators of $U(1)_{T3R}$

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