CP violation and flavor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi mathvariant="italic">SU</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>3</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math> breaking in D-meson decays

Pirtskhalava, David; Uttayarat, Patipan

doi:10.1016/j.physletb.2012.04.039

Cited by 92 publications

(50 citation statements)

References 8 publications

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“…[4,5]). However, we cannot exclude that such result has a SM explanation due to the nonperturbative enhancement of penguin-type hadronic matrix elements [6][7][8][9]. On the other hand, this value can naturally be accommodated in wellmotivated extensions of the SM.…”

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confidence: 85%

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Shedding Light onCPViolation in the Charm System viaD→VγDecays

Isidori

Kamenik

2012

Phys. Rev. Lett.

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Recent evidence for direct CP violation in nonleptonic charm decays cannot be easily accommodated within the standard model. On the other hand, it fits well in new physics models generating CP violating ÁC ¼ 1 chromomagnetic dipole operators. We show that in these frameworks sizable direct CP asymmetries in radiative D ! P þ P À decays (P ¼ , K), with M PP close to the or the peak, can be expected. Enhanced matrix elements of the electromagnetic dipole operators can partly compensate the long distance dominance in these decays, leading to CP asymmetries of the order of several percent. If observed at this level, these would provide a clean signal of physics beyond the standard model and of new dynamics associated with dipole operators. We briefly comment on related CP violating observables accessible via time dependent Dð " DÞ ! P þ P À studies and angular decay product distributions in rare semileptonic D decays.

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confidence: 85%

“…The value in Eq. (2) exceeds by a factor [5][6][7][8][9][10] what is naturally expected in the standard model (SM) (see, e.g., Ref. [3], and the more recent analyses in Refs.…”

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confidence: 88%

Shedding Light onCPViolation in the Charm System viaD→VγDecays

Isidori

Kamenik

2012

Phys. Rev. Lett.

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“…However, as first pointed out in [10], this does not necessarily imply SU (3) breaking on the amplitude level beyond the expected order of ∼ 30% (see also [11] for a similar analysis in the diagrammatic approach). Indeed, for a subset of decays it has been shown again recently that "nominal" SU (3) breaking is sufficient to explain this ratio [12][13][14].…”

Section: Introductionmentioning

confidence: 93%

SU(3)-flavor anatomy of nonleptonic charm decays

2013

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We perform a comprehensive SU (3)-flavor analysis of charmed mesons decaying to two pseudoscalar SU (3)-octet mesons. Taking into account SU (3)-breaking effects induced by the splitting of the quark masses, ms = m u,d , we find that existing data can be described by SU (3)-breaking of the order 30%. The requisite penguin enhancement to accommodate all data on CP violation tends to be even larger than the one extracted from ∆aalone, strengthening explanations beyond the standard model. Despite the large number of matrix elements, correlations between CP asymmetries allow potentially to differentiate between different scenarios for the underlying dynamics, as well as between the standard model and various extensions characterized by SU (3) symmetry and its subgroups. We investigate how improved measurements of the direct CP asymmetries in singly-Cabibbo-suppressed decays can further substantiate the interpretation of the data. We show that particularly informative are the asymmetries in

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“…Many theoretical studies were performed in order to explain the apparent discrepancy [5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

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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CP violation and flavor SU(3) breaking in D-meson decays

Cited by 92 publications

References 8 publications

Shedding Light onCPViolation in the Charm System viaD→VγDecays

Shedding Light onCPViolation in the Charm System viaD→VγDecays

SU(3)-flavor anatomy of nonleptonic charm decays

Colored scalars and the neutron electric dipole moment

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