Shedding Light on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>Violation in the Charm System via<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>D</mml:mi><mml:mo>→</mml:mo><mml:mi>V</mml:mi><mml:mi>γ</mml:mi></mml:math>Decays

Isidori, Gino; Kamenik, Jernej F.

doi:10.1103/physrevlett.109.171801

Cited by 72 publications

(80 citation statements)

References 37 publications

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“…an order of magnitude above SM expectations for these observables [51]. Similar effects are also predicted in the D 0 → K + K − γ mode away from the φ resonance peak.…”

Section: Jhep01(2013)027supporting

confidence: 65%

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Charming CP violation and dipole operators from RS flavor anarchy

Delaunay

Kamenik

Pérez

et al. 2013

J. High Energ. Phys.

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Recently the LHCb collaboration reported evidence for direct CP violation in charm decays. The value is sufficiently large that either substantially enhanced Standard Model contributions or non-Standard Model physics is required to explain it. In the latter case only a limited number of possibilities would be consistent with other existing flavorchanging constraints. We show that warped extra dimensional models that explain the quark spectrum through flavor anarchy can naturally give rise to contributions of the size required to explain the the LHCb result. The D meson asymmetry arises through a sizable CP-violating contribution to a chromomagnetic dipole operator. This happens naturally without introducing inconsistencies with existing constraints in the up quark sector. We discuss some subtleties in the loop calculation that are similar to those in Higgs to γγ. Loop-induced dipole operators in warped scenarios and their composite analogs exhibit non-trivial dependence on the Higgs profile, with the contributions monotonically decreasing when the Higgs is pushed away from the IR brane. We show that the size of the dipole operator quickly saturates as the Higgs profile approaches the IR brane, implying small dependence on the precise details of the Higgs profile when it is quasi IR localized. We also explain why the calculation of the coefficient of the lowest dimension 5D operator is guaranteed to be finite. This is true not only in the charm sector but also with other radiative processes such as electric dipole moments, b → sγ, / K and µ → eγ. We Open Access doi:10.1007/JHEP01(2013)027JHEP01 (2013)027 furthermore discuss the interpretation of this contribution within the framework of partial compositeness in four dimensions and highlight some qualitative differences between the generic result of composite models and that obtained for dynamics that reproduces the warped scenario.

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“…an order of magnitude above SM expectations for these observables [51]. Similar effects are also predicted in the D 0 → K + K − γ mode away from the φ resonance peak.…”

Section: Jhep01(2013)027supporting

confidence: 65%

“…Nonetheless, this may be enough to probe such contributions using CP violating asymmetries [51]. In particular for the exclusive D → ρ(ω)γ final states maximal RS effects are obtained by marginalizing over the unknown strong phases of the interfering amplitudes, yielding…”

Section: Jhep01(2013)027mentioning

confidence: 99%

Charming CP violation and dipole operators from RS flavor anarchy

Delaunay

Kamenik

Pérez

et al. 2013

J. High Energ. Phys.

Self Cite

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“…This is in contrast with both SM-like and chromomagnetic dipole-based NP explanations which predicts a ππ CP a KK CP . Measurements of the individual rate asymmetries (and also possibly of other radiative decays [131]) at flavor factories will provide a clear test of the type of contributions leading to the now well established CPV effect reported in ∆a CP . The O(10 )TeV scale of the above four-fermion operator requires both a saturated NP bound on CP conserving D −D mixing and composite (RH) strange quark.…”

Section: Discussionmentioning

confidence: 99%

Up asymmetries from exhilarated composite flavor structures

Rold

Delaunay

Grojean

et al. 2013

J. High Energ. Phys.

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We present a class of warped extra dimension (composite Higgs) models which conjointly accommodates the tt forward-backward asymmetry observed at the Tevatron and the direct CP asymmetry in singly Cabibbo suppressed D decays first reported by the LHCb collaboration. We argue that both asymmetries, if arising dominantly from new physics beyond the Standard Model, hint for a flavor paradigm within partial compositeness models in which the right-handed quarks of the first two generations are not elementary fields but rather composite objects. We show that this class of models is consistent with current data on flavor and CP violating physics, electroweak precision observables, dijet and top pair resonance searches at hadron colliders. These models have several predictions which will be tested in forthcoming experiments. The CP asymmetry in D decays is induced through an effective operator of the form (ūc) V +A (ss) V +A at the charm scale, which implies a larger CP asymmetry in the D 0 → K + K − rate relative the D 0 → π + π − channel. This prediction is distinctive from other Standard Model or dipole-based new physics interpretation of the LHCb result. CP violation in D−D mixing as well as an an excess of dijet production of the LHC are also predicted to be observed in a near future. A large top asymmetry originates from the exchange of an axial resonance which dominantly produces left-handed top pairs. As a result a negative contribution to the lepton-based forward-backward asymmetry in tt production, as well as O(10%) forward-backward asymmetry in bb production above m bb ≃ 600 GeV at the Tevatron is expected.

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“…Among all possibilities it was found in [5,57] that most likely, a candidate to explain discrepancy between the experimental result and the SM prediction is the color-magnetic dipole operator…”

Section: Following [5] One Can Write An Effective Hamiltonian For Nonmentioning

confidence: 99%

Colored scalars and the neutron electric dipole moment

Fajfer¹,

Eeg²

2014

Phys. Rev. D

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We investigate new contributions to the neutron electric dipole moment induced by colored scalars. As an example, we evaluate contributions coming from the color octet, weak doublet scalar, accommodated within a modified Minimal Flavor Violating framework. These flavor non-diagonal couplings of the color octet scalar might account for the measured assymmetrytree level. The same couplings constrained by this assymmetry also induce two-loop contributions to the neutron electric dipole moment. We find that the direct CP violating asymmetry in neutral D-meson decays is more constraining on the allowed parameter space than the current experimental bound on neutron electric dipole moment. We comment also on contributions of higher dimensional operators to the neutron electric dipole moment within this framework.

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Shedding Light onCPViolation in the Charm System viaD→VγDecays

Cited by 72 publications

References 37 publications

Charming CP violation and dipole operators from RS flavor anarchy

Charming CP violation and dipole operators from RS flavor anarchy

Up asymmetries from exhilarated composite flavor structures

Colored scalars and the neutron electric dipole moment

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