Perturbativity constraints on U(1)B−L and left-right models and implications for heavy gauge boson searches

Chauhan, Garv; Dev, P. S. Bhupal; Mohapatra, Rabindra N.

doi:10.1007/jhep01(2019)208

Cited by 29 publications

(28 citation statements)

References 157 publications

(207 reference statements)

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“…Solid lines correspond to the chosen benchmark values of the hadronic parameters, while the dashed contours include the theoretical uncertainty. In the progressively shaded band at the top, t β 0.6, quark Yukawa couplings become non-perturbative [22], while at the left, for MW R < 6 TeV, the scalar sector becomes non-perturbative [31][32][33].…”

Section: B Resultsmentioning

confidence: 99%

“…This conclusion is however specific of the given setup and could be spoiled by envisaging, for instance, the presence of a PQ mechanism so that the LR scale might still be at the reach of arXiv:1911.09472v2 [hep-ph] 26 Dec 2019 LHC. Although M W R below 6 TeV is disfavored by the demand that the Higgs sector remains in a perturbative regime [31][32][33], an energy window remains for discovery via the KS process [34].…”

Section: Introductionmentioning

confidence: 99%

“…(33).The O q q 1,2 and dipole operators O q 3,4 are obtained from the ∆S = 1 Lagrangian Eqs. (18)-(21) by replacing s → d = q.…”

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confidence: 99%

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Kaon CP violation and neutron EDM in the minimal left-right symmetric model

2020

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Within the minimal Left-Right (LR) symmetric model we revisit the predictions for the kaon CP violating observables ε and ε in correlation with the neutron electric dipole moment. We perform a complete study of the cross constraints on the model parameters, phases and the MW R scale, considering the two cases of extended parity or charge conjugation as LR discrete symmetries, together with the possible presence of a Peccei-Quinn symmetry. We discuss in particular two scenarios: whether the Standard Model saturates the experimental value of ε /ε or whether new physics is needed, still an open issue after the recent lattice results on the QCD penguin matrix elements. Within the first scenario, we find no constraints on the LR scale in the charge-conjugation case while in the parity case we show that MW R can be as low as 13 TeV. On the other side, the request that new physics contributes dominantly to ε implies strong correlations among the model parameters, with an upper bound of MW R < 8-100 TeV depending on tan β in the case of charge conjugation and a range of MW R 7-45 TeV in the parity setup. Both scenarios may be probed directly at future colliders and only indirectly at the LHC. * stefano.bertolini@sissa.it † Alessio.Maiezza@irb.hr ‡ fabrizio.nesti@aquila.infn.it Right (LR) symmetric theories, based on the gauge groupA particular role is played by the minimal version of the Left-Right symmetric models (LRSM) [9]. Besides being predictive, the model provides a natural rationale for the origin and smallness of the neutrino mass [10,11], a setup for the restoration of parity at high scale [12], and a novel source for neutrinoless double-beta decay [13,14]. The LRSM has aroused a renewed interest in the era of LHC, because of the possibility of a direct detection via the Keung-Senjanovic (KS) process [15], which violates lepton number in full analogy with the low energy neutrinoless double-beta decay.

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Section: B Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Kaon CP violation and neutron EDM in the minimal left-right symmetric model

2020

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“…It has been shown in detail in Ref. [51] that this lower bound on the scale of breaking of the SU (2) R symmetry is obtained from stringent flavor constraints, assuming that all the gauge and quartic couplings remain perturbative up to the GUT scale. This makes it hard to detect the SU (2) R gauge bosons at the LHC.…”

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confidence: 96%

Neutrino predictions from a left-right symmetric flavored extension of the standard model

Hernández

Kovalenko

Valle

et al. 2019

J. High Energ. Phys.

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We propose a left-right symmetric electroweak extension of the Standard Model based on the ∆ (27) family symmetry. The masses of all electrically charged Standard Model fermions lighter than the top quark are induced by a Universal Seesaw mechanism mediated by exotic fermions. The top quark is the only Standard Model fermion to get mass directly from a tree level renormalizable Yukawa interaction, while neutrinos are unique in that they get calculable radiative masses through a low-scale seesaw mechanism. The scheme has generalized µ − τ symmetry and leads to a restricted range of neutrino oscillations parameters, with a nonzero neutrinoless double beta decay amplitude lying at the upper ranges generically associated to normal and inverted neutrino mass ordering.

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“…In order to address the above issues, there are many well motivated extensions of the SM like SUSY [14][15][16][17], two Higgs doublet model [18][19][20][21][22][23], extension of the SM with an extra U (1) gauge group [24][25][26][27] and many more. In this work, we have considered the gauged U (1) L µ −L τ extension of the SM due to its relatively simple theoretical structure and background free environment, which has a complete gauge group SU (3) C × SU (2) L × U (1) Y × U (1) L µ −L τ and is called the U (1) L µ −L τ model [28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

The signatures of the new particles $$h_{2}$$ and $$Z^{}_{\mu \tau }$$ at e-p colliders in the $${U(1)}_{L^{}_{\mu } - L^{}_{\tau } }$$ model

Hou

Yue

2019

Eur. Phys. J. C

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Considering the superior performances of the two future e-p colliders, LHeC and FCC-eh, we discuss the feasibility of detecting the additional neutral scalar h 2 and the light gauge boson Z µτ , which are predicted by the U (1) L µ −L τ model. Taking into account the experimental constraints on the relevant free parameters, we consider all possible production channels of h 2 and Z µτ at e-p colliders and further investigate their observability through the optimal channels in the case of the beam polarization P(e − )= -0.8. We find that the signal significance above 5σ of h 2 as well as Z µτ detecting can be achieved via e − p → e − jh 2 (→ Z µτ Z µτ ) → e − j + E T process and a 5σ sensitivity of Z µτ detecting can be gained via e − p → e − jh 1 (→ Z µτ Z µτ ) → e − j + E T process at e-p colliders with appropriate parameter values and a designed integrated luminosity. * the U (1) L µ −L τ model is that the anomaly cancellation does not require any extra chiral fermionic degrees of freedom. In this model, the breaking of L µ − L τ symmetry conduces to additional terms in the neutrino mass matrix, which offer an explanation for the neutrino masses and mixing simultaneously [34,35]. Besides, the scalar sector has been expanded by two additional complex scalar singlets (φ H and φ DM ) with nonzero L µ − L τ charge. The scalar φ DM can act as a viable DM candidate [36]. The other scalar φ H acquires a vacuum expectation value (VEV) v µτ and thereby making an additional neutral scalar h 2 product after spontaneous breaking of U (1) L µ −L τ , which indicates that h 2 has a mass of the same order with v µτ about 10 GeV -1000 GeV [33,37]. Owing to the significance of precise measurement of Higgs boson properties, many people are sparing no effort to search for the additional neutral scalars which can be produced and decay via their mixing with the SM-like Higgs boson h 1 [47].On the other hand, an extra neutral gauge boson Z µτ is also introduced and obtains a mass after spontaneous symmetry breaking of U (1) L µ −L τ . Z µτ does not couple to the SM quarks and the first generation leptons, which makes it immune to any restrictions coming from lepton and hadron colliders such as LEP and LHC. Therefore, the mass of Z µτ can be as light as 100 MeV for a low value of gauge coupling g µτ ≤ 10 −3 , which is required to meet the limits arising from neutrino trident production. The Z µτ with an MeV-scale mass can resolve the muon (g − 2) anomaly, explain the deficit of cosmic neutrino flux [34,39,40] and resolve the problem of relic abundance of DM in the scenario with a light weakly interacting massive particle [41-43] simultaneously. Therefore, searching for its possible collider evidences plays a vital role in exploring NP. Many attempts to discover this kind of new particles have been made in the meson decay experiment [44], beam dump experiment [45], electron-positron collider experiments [46] and so on.Searches for the new particles predicted by the U (1) L µ −L τ model are presently being conducted at the LHC and ILC [3...

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Perturbativity constraints on U(1)B−L and left-right models and implications for heavy gauge boson searches

Cited by 29 publications

References 157 publications

Kaon CP violation and neutron EDM in the minimal left-right symmetric model

Kaon CP violation and neutron EDM in the minimal left-right symmetric model

Neutrino predictions from a left-right symmetric flavored extension of the standard model

The signatures of the new particles $$h_{2}$$ and $$Z^{}_{\mu \tau }$$ at e-p colliders in the $${U(1)}_{L^{}_{\mu } - L^{}_{\tau } }$$ model

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