The New Physics Reach of Null Tests with $D\to \pi \ell \ell$ and $D_s\to K\ell \ell$ Decays

Abstract

$|\Delta c|=|\Delta u|=1$ processes are unique probes of flavor physics in the up-sector within and beyond the Standard Model (SM). SM tests with rare semileptonic charm meson decays are based on an approximate CP--symmetry, a superior GIM--mechanism, angular distributions, lepton-universality and lepton flavor conservation. We analyze the complete set of null test observables in $D\to \pi \ell {\ell }^{(\prime )}$ and $D_s\to K\ell {\ell }^{(\prime )}$ decays, ${\ell }^{(\prime )}=e,\mu$, and find large room for new physics safely above the SM contribution. We identify signatures of supersymmetry, leptoquarks and anomaly-free $U(1{)}^{\prime }$-models with generation-dependent charges, for which we provide explicit examples. $Z^{\prime }$-effects in $c\to u\ell {\ell }^{(\prime )}$ transitions can be sizable if both left-handed and right-handed couplings to quarks are present.

arXiv commentv3: 35 pages, 12 figures; Terms involving finite m_l and C_T corrected in Eqs. (7), (17), (18), (21); q^2 integration limits in Eq.(9) adapted to LHCb analysis; benchmarks for D->pi mumu in Table II corrected; bounds on WCs in Eq. (10) and (25) corrected; further numerics and conclusions unchanged

References in corpus (37)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• More Model-Independent Analysis of b->s Processes
• Angular Distributions of B -> K ll Decays
• Implications of LHCb measurements and future prospects
• Bounds on R-parity Violating Couplings at the Weak Scale and at the GUT Scale
• Rare Charm Decays in the Standard Model and Beyond
• High-$p_T$ dilepton tails and flavour physics
• Renormalization-group evolution of new physics contributions to (semi)leptonic meson decays
• Implications of D^0-\bar D^0 Mixing for New Physics
• Leptoquark Flavor Patterns & B Decay Anomalies
• Prospects of discovering new physics in rare charm decays
• Flavor & new physics opportunities with rare charm decays into leptons
• An Anomaly-free Atlas: charting the space of flavour-dependent gauged $U(1)$ extensions of the Standard Model
• The Anatomy of Z' and Z with Flavour Changing Neutral Currents in the Flavour Precision Era
• Relating D0-anti-D0 Mixing and D0 -> l+l- with New Physics
• Searches for Rare or Forbidden Semileptonic Charm Decays
• On $D\to X_u{l}^{+}{l}^{-}$ within the Standard Model and Frameworks like the Littlest Higgs Model with T Parity
• Standard Model prediction and new physics tests for D0 -> h+h-l+l- (h=π,K; l=e,μ)
• Lessons from Recent Measurements of D-\bar D Mixing
• Search for D+(s) to pi+ mu+ mu- and D+(s) to pi- mu+ mu+ decays
• Search for the rare decay $D^0\to {\mu }^{+}{\mu }^{-}$
• Anomaly-Free Models for Flavour Anomalies
• Null tests from angular distributions in $D\to P_1{P}_2{l}^{+}{l}^{-}$, $l=e,\mu$ decays on and off peak
• Rare radiative charm decays within the standard model and beyond
• Search for the lepton-flavour violating decay $D^0\to e^{\pm }{\mu }^{\mp }$
• Resonance catalyzed CP asymmetries in D -> P l+ l-
• Observation of $D^0$ meson decays to ${\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ and $K^{+}{K}^{-}{\mu }^{+}{\mu }^{-}$ final states
• Observation of $D^0\to {\rho }^0\gamma$ and search for $CP$ violation in radiative charm decays
• Short-distance matrix elements for $D^0$-meson mixing for $N_f=2+1$ lattice QCD
• $D\to \rho {\ell }^{+}{\ell }^{-}$ Decays in the QCD Factorization Approach
• Tensor form factor of $D\to \pi (K)\ell \nu$ and $D\to \pi (K)\ell \ell$ decays with $N_f=2+1+1$ twisted-mass fermions
• Measurement of angular and CP asymmetries in $D^0\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ and $D^0\to K^{+}{K}^{-}{\mu }^{+}{\mu }^{-}$ decays
• K -> pi nu nubar from standard to new physics
• New Physics effects in charm meson decays involving $c\to u{l}^{+}{l}^{-}(l_i^{\mp }{l}_j^{\pm })$ transitions
• Testing the standard model with $D_{(s)}\to K_1(\to K\pi \pi )\gamma$ decays
• Decays $D_{(s)}^{+}\to \pi (K{)}^{+}{\ell }^{+}{\ell }^{-}$ and $D^0\to {\ell }^{+}{\ell }^{-}$ in the MSSM with and without R-parity
• The photon polarization in radiative $D$ decays, phenomenologically

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• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
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• Combined Constraints on First Generation Leptoquarks
• Exploiting CP-asymmetries in rare charm decays
• Rare charm $\mathbf{c}\to \mathbf{u}\mathbf{\nu }\bar{\mathbf{\nu }}$ dineutrino null tests for ${\mathbf{e}}^{+}{\mathbf{e}}^{-}$-machines
• Mixing and $CP$ violation in the charm system
• Theoretical and experimental status of rare charm decays
• Testing Lepton Flavour Universality with (Semi)-Leptonic $D_{(s)}$ Decays
• Disentangling QCD and New Physics in $D^{+}\to {\pi }^{+}{\ell }^{+}{\ell }^{-}$
• Correlating $B\to K^{(\ast )}\nu \bar{\nu }$ and flavor anomalies in SMEFT
• Chiral Abelian gauge theories with few fermions
• Two is better than one: The U-spin-CP anomaly in charm
• Flavor violating Higgs and $Z$ decays at FCC-ee
• Angular analysis of $D^0\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ and $D^0\to K^{+}{K}^{-}{\mu }^{+}{\mu }^{-}$ decays and search for $CP$ violation
• Flavor Physics at the CEPC: a General Perspective
• Pinning down $|\Delta c|=|\Delta u|=1$ couplings with rare charm baryon decays
• Effective field theory analysis of rare $|\Delta c|=|\Delta u|=1$ charm decays
• Correlating New Physics Effects in Semileptonic $\Delta C=1$ and $\Delta S=1$ Processes
• Rare radiative decays of charm baryons
• $S$-wave contribution to rare $D^0\to {\pi }^{+}{\pi }^{-}{\ell }^{+}{\ell }^{-}$ decays in the Standard Model and sensitivity to New Physics
• FCNC processes of charmed hadrons with invisible scalar
• Search for $D^0$ meson decays to ${\pi }^{+}{\pi }^{-}{e}^{+}{e}^{-}$ and $K^{+}{K}^{-}{e}^{+}{e}^{-}$ final states
• Search for resonance-enhanced $CP$ and angular asymmetries in the ${\Lambda }_c^{+}\to p{\mu }^{+}{\mu }^{-}$ decay at LHCb
• Prospects for discovering new physics in charm sector through low-energy scattering processes $e^{-}p\to e^{-}({\mu }^{-}){\Lambda }_c$
• Gauge $SU(2{)}_f$ flavour transfers
• Probing QCD dynamics and the standard model with $D_{(s)}\to P^{+}{P}^0\gamma$ decays
• Searching and identifying leptoquarks through low-energy polarized scattering processes $e^{-}p\to e^{-}{\Lambda }_c$
• Up-type FCNC in presence of Dark Matter
• B-Anomalies from flavorful U(1)' extensions, safely
• Measurement of the $D^0\to K^{-}{\pi }^{+}{e}^{+}{e}^{-}$ branching fraction and search for $D^0\to {\pi }^{+}{\pi }^{-}{e}^{+}{e}^{-}$ and $D^0\to K^{+}{K}^{-}{e}^{+}{e}^{-}$ decays at Belle
• Null test searches for BSM physics with rare charm decays
• Probing invisible particles with charm
• The Deconstruction of Flavor in the Privately Democratic Higgs Sector