Testing the standard model with $D_{(s)}\to K_1(\to K\pi \pi )\gamma$ decays

Abstract

The photon polarization in $D_{(s)}\to K_1(\to K\pi \pi )\gamma$ decays can be extracted from an up-down asymmetry in the $K\pi \pi$ system, along the lines of the method known to $B\to K_1(\to K\pi \pi )\gamma$ decays. Charm physics is advantageous as partner decays exist: $D^{+}\to K_1^{+}(\to K\pi \pi )\gamma$, which is standard model-like, and $D_s\to K_1^{+}(\to K\pi \pi )\gamma$, which is sensitive to physics beyond the standard model in $|\Delta c|=|\Delta u|=1$ transitions. The standard model predicts their photon polarizations to be equal up to U-spin breaking corrections, while new physics in the dipole operators can split them apart at order one level. We estimate the proportionality factor in the asymmetry multiplying the polarization parameter from axial vectors $K_1(1270)$ and $K_1(1400)$ to be sizable, up to the few $\mathcal{O}(10)\%$ range. The actual value of the hadronic factor matters for the experimental sensitivity, but is not needed as an input to perform the null test.

arXiv comment17 pages, 6 figures

References in corpus (24)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• QCD factorization for exclusive, non-leptonic B meson decays: General arguments and the case of heavy-light final states
• The Unitarity Triangle Fit in the Standard Model and Hadronic Parameters from Lattice QCD: A Reappraisal after the Measurements of Delta m_s and BR(B to tau nu)
• The Radiative Decays B -> V gamma at Next-to-Leading Order in QCD
• A consistent picture for large penguins in D -> pi+ pi-, K+ K-
• Calculation of Long-Distance Effects in Exclusive Weak Radiative Decays of B-Mesons
• Flavor & new physics opportunities with rare charm decays into leptons
• SU(3)-Flavor Anatomy of Non-Leptonic Charm Decays
• The photon polarization in B -> X gamma in the standard model
• Measuring the Photon Helicity in Radiative B Decays
• Topological amplitudes in $D$ decays to two pseudoscalars: a global analysis with linear $SU(3{)}_F$ breaking
• $B\to K_1\gamma$ Decays in the Light-Cone QCD Sum Rules
• Photon polarization in radiative B decays
• Observation of photon polarization in the $b\to s\gamma$ transition
• Rare radiative charm decays within the standard model and beyond
• Observation of $D^0\to {\rho }^0\gamma$ and search for $CP$ violation in radiative charm decays
• Determining the photon polarization of the b --> s gamma using the B --> K1(1270) gamma --> (K pi pi) gamma decay
• The strong decays of K1 resonances
• Study of the K+ pi+ pi- Final State in B+ -> J/psi K+ pi+ pi- and B+ -> psi-prime K+ pi+ pi-
• Measurement of branching fractions of B decays to K1(1270)pi and K1(1400)pi and determination of the CKM angle alpha from B0 --> a1(1260)+/- pi-/+
• Time-dependent analysis of $B^0\to K_S^0{\pi }^{-}{\pi }^{+}\gamma$ decays and studies of the $K^{+}{\pi }^{-}{\pi }^{+}$ system in $B^{+}\to K^{+}{\pi }^{-}{\pi }^{+}\gamma$ decays
• The photon polarization in radiative $D$ decays, phenomenologically
• Reexamining the photon polarization in $B\to K\pi \pi \gamma$
• Parity Doubling as a Tool for Right-handed Current Searches

Cited by in corpus (7)

• The New Physics Reach of Null Tests with $D\to \pi \ell \ell$ and $D_s\to K\ell \ell$ Decays
• Theoretical and experimental status of rare charm decays
• Radiative three-body D-meson decays in and beyond the standard model
• Rare radiative decays of charm baryons
• Up-down Asymmetries and Angular Distributions in $D\to K_1(\to K\pi \pi ){\ell }^{+}{\nu }_{\ell }$
• Probing QCD dynamics and the standard model with $D_{(s)}\to P^{+}{P}^0\gamma$ decays
• The hadronic $\tau$ decay ${\tau }^{-}\to K_1^{-}{\nu }_{\tau }\to (K^{-}\omega ){\nu }_{\tau }\to (K^{-}{\pi }^{+}{\pi }^{-}{\pi }^0){\nu }_{\tau }$ and the axial vector mixing angle