Up sector of minimal flavor violation: top quark properties and direct D meson CP violation

Bai, Y.; Berger, Joshua; Hewett, JoAnne L.; Li, Ye

doi:10.1007/jhep07(2013)166

Cited by 3 publications

(2 citation statements)

References 73 publications

(88 reference statements)

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“…It gives generalized expressions for the CP asymmetry A CP and the related quantities A Γ , y CP [see Eqs. (17), (18), (30), (33)] that are valid even with nonuniversal A indir CP . The expressions prevalent in the standard literature [3,5] do not take this possibility into account.…”

Section: Cpmentioning

confidence: 99%

“…These include the fourth quark generation [29,27], supersymmetric gluino-squark loops [6], littlest Higgs model with T-parity [30,31], flavor violation in the up sector [32,33], models with a color-sextet diquark [34], models giving rise to the t-channel exchange of a weak doublet with a special flavor structure [35], the nonmanifest left-right symmetric model [36], or models with warped extra dimensions [37]. A survey of the effect of NP models that may contribute to the difference CP asymmetry has been performed in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Nonuniversality of indirectCPasymmetries inD→ππ,KKdecays

2014

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We point out that, if the direct CP asymmetries in the D → π + π − and D → K + K − decays are unequal, the indirect CP asymmetries as measured in these modes are necessarily unequal. This nonuniversality of indirect CP asymmetries can be significant with the right amount of new physics contributions, a scenario that may be fine-tuned, but is still viable. A model-independent fit to the current data allows different indirect CP asymmetries in the above two decays. This could even be contributing to the apparent tension between the difference CP asymmetries ∆A CP measured through the pion-tagged and muon-tagged data samples at the LHCb. This also implies that the measurements of A Γ and y CP in the π + π − and K + K − decay modes can be different, and averaging over these two modes should be avoided. In any case, the complete analysis of CP violation measurements in the D meson sector needs to take into account the possibility of different indirect CP asymmetries in the π + π − and K + K − channels. * amol@theory.tifr.res.in † diptimoy.ghosh@roma1.infn.it ‡ bhavik@theory.tifr.res.in

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Section: Cpmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonuniversality of indirectCPasymmetries inD→ππ,KKdecays

2014

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Distinguishing the right-handed up/charm quarks from the top quark via discrete symmetries in standard model extensions

Huang

Wang

2014

Phys. Rev. D

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We propose a class of the two Higgs doublet Standard models (SMs) with a SM singlet and a class of supersymmetric SMs with two pairs of Higgs doublets, where the right-handed up/charm quarks and the right-handed top quark have different quantum numbers under extra discrete symmetries.Thus, the right-handed up and charm quarks couple to one Higgs doublet field, while the righthanded top quark couples to another Higgs doublet. The quark CKM mixings can be generated from the down-type quark sector. As one of phenomenological consequences in our models, we explore whether one can accommodate the observed direct CP asymmetry difference in singly Cabibbo-suppressed D decays. We show that it is possible to explain the measured values of CP violation under relevant experimental constraints.

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Search for pseudoscalar-mediated WIMPs int→ctransitions with missing energy

Jia

2015

Phys. Rev. D

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The recent astronomical observation of GeV gamma-ray excess from the Galactic Center was suggested due to a bb mode in tens GeV WIMP (weakly interacting massive particle) pair annihilations, and this mode was also explored by the new dwarf galaxy observation. Considering the case the WIMP pair mass below top quark mass, a pseudoscalar φ is studied in this article, which mediates the interactions between the standard model fermions and fermionic WIMPs, and neutral flavor-changing interactions in standard model fermion sectors. The bb mode is favored in WIMP pair annihilations, while the WIMP-nucleus scattering is highly suppressed in direct detection. Alternative schemes of t → c decay and single top production are employed to search WIMPs. Assuming the mass of WIMP around 5-60 GeV and with the reasonable inputs by the constraints, the branching ratio B t→cχχ of a top quark decaying into a charm quark and a WIMP pair is derived of order 10 −8 − 10 −5 , thus careful studies in the future on top-physics may help to gain a better understanding of WIMPs.

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Up sector of minimal flavor violation: top quark properties and direct D meson CP violation

Cited by 3 publications

References 73 publications

Nonuniversality of indirectCPasymmetries inD→ππ,KKdecays

Nonuniversality of indirectCPasymmetries inD→ππ,KKdecays

Distinguishing the right-handed up/charm quarks from the top quark via discrete symmetries in standard model extensions

Search for pseudoscalar-mediated WIMPs int→ctransitions with missing energy

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