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Weekly seminars
Inverse Hierarchy MFV: The Quark Dipole Operator
par
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Europe/Paris
Auditorium (LAPTh)
Auditorium
LAPTh
Description
We present a new minimal flavor violation (MFV) scenario in
which the up-type quark dipole coupling matrices $C_{uV}^{ij}$, $V=W$ or
$B$,
are not only diagonal in the up-type mass eigenbasis but also have the
eigenvalues that are inversely proportional to
the quark masses. Namely, $C_{uV}^{11}$ is the largest Wilson
coefficient in the three families.
We analyze several aspects of $\mathcal{O}_{uW}$ in this ``inverse
hierarchy MFV quark dipole'' framework.
In the infrared regime, we compare the flavor changing bounds of the
$K^0-\bar{K}^0$ oscillation and exotic decays of the charged pion
$\pi^+\rightarrow \bar{e}\nu_e\gamma$.
Due to the GIM cancellation and the helicity suppression, these bounds
are loose for the first generation quark and require
$|C_{uV}^{11}|<\mathcal{O}(10){\rm TeV}^{-2}$.
In the ultraviolet(UV) theories, the quark dipole operators are induced
by the heavy states in the loops. Consequently, the quark masses receive
sizable radiative corrections, leading to the light quarks' naturalness
problem. In our framework, we provide a type of UV model in which the
loop corrections to the mass cancel each other out. As a key part of our
phenomenological study, we simulate the $pp\rightarrow W h\rightarrow
\gamma\gamma\ell\nu$ process at the FCC-$hh$ colliderwith $\sqrt{s}=100$
TeV and $\mathcal{L}=30$ ab$^{-1}$. High-precision measurements there
could set an upper bound on $C_{uW}$ in the ballpark of $10^{-2}$
TeV$^{-2}$ which is an order of magnitude stronger than the existing
bounds obtained from LHC dilepton Drell-Yann channel analysis. As to
$\mathcal{O}_{uB}$, we discuss it relation with $\mathcal{O}_{\varphi
q}^{(1)}$ in the presence of the $H\leftrightarrow H^*$ symmetry.
which the up-type quark dipole coupling matrices $C_{uV}^{ij}$, $V=W$ or
$B$,
are not only diagonal in the up-type mass eigenbasis but also have the
eigenvalues that are inversely proportional to
the quark masses. Namely, $C_{uV}^{11}$ is the largest Wilson
coefficient in the three families.
We analyze several aspects of $\mathcal{O}_{uW}$ in this ``inverse
hierarchy MFV quark dipole'' framework.
In the infrared regime, we compare the flavor changing bounds of the
$K^0-\bar{K}^0$ oscillation and exotic decays of the charged pion
$\pi^+\rightarrow \bar{e}\nu_e\gamma$.
Due to the GIM cancellation and the helicity suppression, these bounds
are loose for the first generation quark and require
$|C_{uV}^{11}|<\mathcal{O}(10){\rm TeV}^{-2}$.
In the ultraviolet(UV) theories, the quark dipole operators are induced
by the heavy states in the loops. Consequently, the quark masses receive
sizable radiative corrections, leading to the light quarks' naturalness
problem. In our framework, we provide a type of UV model in which the
loop corrections to the mass cancel each other out. As a key part of our
phenomenological study, we simulate the $pp\rightarrow W h\rightarrow
\gamma\gamma\ell\nu$ process at the FCC-$hh$ colliderwith $\sqrt{s}=100$
TeV and $\mathcal{L}=30$ ab$^{-1}$. High-precision measurements there
could set an upper bound on $C_{uW}$ in the ballpark of $10^{-2}$
TeV$^{-2}$ which is an order of magnitude stronger than the existing
bounds obtained from LHC dilepton Drell-Yann channel analysis. As to
$\mathcal{O}_{uB}$, we discuss it relation with $\mathcal{O}_{\varphi
q}^{(1)}$ in the presence of the $H\leftrightarrow H^*$ symmetry.
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