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- W1481888433 abstract "We investigate the attempt using flavor violation gauge interaction in the up sector to explain the LHCb recently observed large $Delta A_{CP}$ ($A_{CP}(D^{0}to K^{+}K^{-})-A_{CP}(D^{0}to pi^{+}pi^{-})$). We study an Abelian model that only right-handed up quarks is charged under it and the 1-3 coupling is maximized. The simultaneous 1-3 2-3 mixing is realized by a quark mixing of 1-2 generation. Given the easy identification of top quark, the model can be directly tested by $Delta F=1$ and $Delta F=2$ processes at the hadron colliders as associated top production $g c to t Z^{prime}$ or same-sign top scattering $u uto t t$. The direct search bounds are still consistent with the assumption that $ut$ and $ct$ couplings are equal but the same-sign top scattering bound is expected to be reached very soon. However, since there is no CKM-like suppression, the corresponding parameter space for generating $Delta A_{CP}$ is completely excluded by the $D^{0}-bar{D}^{0}$ mixing. We conclude that the up FCNC type models cannot explain the $Delta A_{CP}$ while to be consistent with the $D^{0}-bar{D}^{0}$ mixing constraint at the same time. On the other hand, a model as SM with fourth family extension has better chance to explain the large $Delta A_{CP}$ consistently." @default.
- W1481888433 created "2016-06-24" @default.
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- W1481888433 date "2012-03-01" @default.
- W1481888433 modified "2023-10-17" @default.
- W1481888433 title "Can up FCNC solve the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si1.gif overflow=scroll><mml:mi mathvariant=normal>Δ</mml:mi><mml:msub><mml:mi>A</mml:mi><mml:mi mathvariant=italic>CP</mml:mi></mml:msub></mml:math> puzzle?" @default.
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- W1481888433 doi "https://doi.org/10.1016/j.physletb.2012.02.021" @default.
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