Hidden sector behind the CKM matrix

Okawa, Shohei; Omura, Yuji

doi:10.1103/physrevd.96.035012

Cited by 3 publications

(2 citation statements)

References 92 publications

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“…#3 If the (U (1) L , U (1) R ) charge of X b is defined as (−1/3, 1/3), X b couples to down-type quarks at the renormalizable level and the phenomenology is similar to the one discussed in Refs. [29,30]. In this case, however, we may suffer from the bound on the stable mirror up quark.…”

Section: The Interaction Of the Scalarsmentioning

confidence: 99%

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WIMP dark matter in the parity solution to the strong CP problem

Kawamura

Okawa

Omura

et al. 2019

J. High Energ. Phys.

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We extend the Standard Model (SM) with parity symmetry, motivated by the strong CP problem and dark matter. In our model, parity symmetry is conserved at high energy by introducing a mirror sector with the extra gauge symmetry, SU (2) R × U (1) R . The charges of SU (2) R × U (1) R are assigned to the mirror fields in the same way as in the SM, but the chiralities of the mirror fermions are opposite to respect the parity symmetry. The strong CP problem is resolved, since the mirror quarks are also charged under the SU (3) c in the SM. In the minimal setup, the mirror gauge symmetry leads to stable colored particles which would be inconsistent with the observed data, so that we introduce two scalars in order to deplete the stable colored particles. Interestingly, one of the scalars becomes stable because of the gauge symmetry and therefore can be a good dark matter candidate. We especially study the phenomenology relevant to the dark matter, i.e. thermal relic density, direct and indirect searches for the dark matter. The bounds from the LHC experiment and the Landau pole are also taken into account. As a result, we find that a limited region is viable: the mirror up quark mass is around [600 GeV, 3 TeV] and the relative mass difference between the dark matter and the mirror up quark or electron is about O(1-10 %). We also discuss the neutrino sector and show that the right-handed neutrinos in the mirror sector can increase the effective number of neutrinos or dark radiation by 0.14.

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Section: The Interaction Of the Scalarsmentioning

confidence: 99%

“…Then, assuming v L v R , v l X , the stationary conditions, Eqs. (30) and (31), lead an approximate condition for v R and v l X :…”

Section: The Condition For the Gauge Symmetry Breakingmentioning

confidence: 99%

WIMP dark matter in the parity solution to the strong CP problem

Kawamura

Okawa

Omura

et al. 2019

J. High Energ. Phys.

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Heavy quark-philic scalar dark matter with a vector-like fermion portal

Baek

2018

J. Cosmol. Astropart. Phys.

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The absence of confirmed signal in dark matter (DM) direct detection (DD) may suggest weak interaction strengths between DM and the abundant constituents inside nucleon, i.e. gluons and valence light quarks. In this work we consider a real scalar dark matter S interacting only with SU(2)L singlet Up-type quarks Ui = uR,cR,tR via a vector-like fermion ψ which has the same quantum number as Ui. The DM-nucleon scattering can proceed through both h-mediated Higgs portal (HP) and ψ-mediated vector-like portal (VLP), in which HP can receive sizable radiative corrections through the new fermions. We first study the separate constraints on the new Yukawa couplings yi and find that the constraints of XENON1T results are strong on y1 from VLP scattering and on y3 from its radiative contributions to HP scattering. Since both DM-light quark interactions and HP have been well studied in the existing literature, we move forward to focus on DM-heavy quark interactions. Since there is no valence c,t quark inside nucleons at μhad ∼ 1 GeV, y2,y3 interactions are manifested in DM-gluon scattering at loop level. We find that renormalization group equation (RGE) and heavy quark threshold effects are important if one calculates the DM-nucleon scattering rate σSIp at μhad ∼ 1 GeV while constructing the effective theory at μEFT ∼ mZ. For the benchmarks y3 = 0.5, y2 = 0.5, 1, 3, combined results from ΩDM h2 ≃ 0.12, XENON1T, Fermi-LAT, 13 TeV LHC data have almost excluded mS < mt/2 when only DM-{c,t} interactions are considered. FCNC of top quark can be generated at both tree level t → ψ(*)S → cSS and loop level t → c+γ/g/Z, of which the branching fractions are typically below 10−9 after passing the other constraints, which are still safe from the current top quark width measurements.

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Interplay between the b→sll anomalies and dark matter physics

2017

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Recently, the LHCb collaboration has reported the excesses in the b → sll processes. One of the promising candidates for new physics to explain the anomalies is the extended Standard Model (SM) with vector-like quarks and leptons. In that model, Yukawa couplings between the extra fermions and SM fermions are introduced, adding extra scalars. Then, the box diagrams involving the extra fields achieve the b → sll anomalies. It has been known that the excesses require the large Yukawa couplings of leptons, so that this kind of model can be tested by studying correlations with other observables. In this paper, we consider the extra scalar to be a dark matter (DM) candidate, and investigate DM physics as well as the flavor physics and the LHC physics. The DM relic density and the direct-detection cross section are also dominantly given by the Yukawa couplings, so that we find some explicit correlations between DM physics and the flavor physics. In particular, we find the predictions of the b → sll anomalies against the direct detection of DM. arXiv:1706.04344v2 [hep-ph] 1 Nov 2017Recently, the LHCb collaboration has reported that there are deviations from the Standard Model (SM) predictions in the b → sll processes. In the experiment, the branching fractions of B → K ( * ) ll (l = e, µ) are measured, and lepton universalities and angular distributions are studied in each process. One excess is reported in the ratio between BR(B + → K + µµ) and BR(B + → K + ee) in the region with 1 GeV 2 ≤ q 2 ≤ 6 GeV 2 , where q 2 is the invariant mass of two leptons in the final state [1]. The experimental result suggests the smaller value of BR(B + → K + µµ) than the SM prediction, and the deviation is about 2.6σ [1]. Recently, a similar deviation is discovered in B → K * µµ [2]. The B decay to µ pair in this process is again smaller than the SM prediction. Similar indications are also reported in B → φ µµ [3] and Λ b → Λ µµ [4] in the same q 2 region. Moreover, the disagreement between the experimental results and the SM prediction of the angular distribution in B → K * µµ is also one of the longstanding issues [5,6]. The CMS collaboration has shown the result that may be consistent with the SM prediction, but the deviation is still large in the LHCb experiment and the others. Thus, there might be some issues in the b → s transition associated with µ.The SM predicts that namely C 7 , C 9 and C 10 operators contribute to the b → sll processes. C 7 can not give sizable contributions to the processes, because it corresponds to the electric dipole operator that is strictly constrained by B → X s γ. In the region with 1 GeV 2 ≤ q 2 ≤ 6 GeV 2 , the C 9 and C 10 operators dominantly contribute to the branching ratios. The Wilson coefficients, C l 9 and C l 10 , are defined as follows:

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Hidden sector behind the CKM matrix

Cited by 3 publications

References 92 publications

WIMP dark matter in the parity solution to the strong CP problem

WIMP dark matter in the parity solution to the strong CP problem

Heavy quark-philic scalar dark matter with a vector-like fermion portal

Interplay between the b→sll anomalies and dark matter physics

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