Indirect constraints on lepton-flavour-violating quarkonium decays

Abstract

Within an effective-field-theory framework, we present a model-independent analysis of the potential of discovering new physics by searching for lepton flavour violation in heavy quarkonium decays and, more in general, we study the phenomenology of lepton-flavour-violating (LFV) 2 quark - 2 lepton ($2q2\ell$) operators with two charm or bottom fields. We compute the constraints from LFV muon and tau decays on the new-physics operators that can induce LFV processes involving $c\bar{c}$ and $b\bar{b}$ systems, thus providing a comprehensive list of indirect upper limits on processes such as $J/\psi \to \ell {\ell }^{\prime }$, ${\rm Y}(nS)\to \ell {\ell }^{\prime }$, ${\rm Y}(nS)\to \ell {\ell }^{\prime }\gamma$ etc., which can be sought at BESIII, Belle II, and the proposed super tau-charm factory. We show that such indirect constraints are so stringent that they prevent the detection of quarkonium decays into $e\mu$. In the case of decays of quarkonia into $\ell \tau$ ($\ell =e,\mu$), we find that an improvement by 2-3 orders of magnitude on the current sensitivities is in general required in order to discover or further constrain new physics. However, we show that cancellations among different contributions to the LFV tau decay rates are possible, such that ${\rm Y}(nS)\to \ell \tau$ can saturate the present experimental bounds. We also find that, interestingly, searches for LFV $Z$ decays, $Z\to \ell \tau$, at future $e^{+}{e}^{-}$ colliders are complementary probes of $2q2\ell$ operators with third generation quarks.

arXiv comment21 pages + appendices. 6 figures, 6 tables. Version to appear in PRD

References in corpus (72)

• Dimension-Six Terms in the Standard Model Lagrangian
• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• New Developments in FeynCalc 9.0
• Renormalization Group Evolution of the Standard Model Dimension Six Operators III: Gauge Coupling Dependence and Phenomenology
• Renormalization Group Evolution of the Standard Model Dimension Six Operators II: Yukawa Dependence
• Muon Decay and Physics Beyond the Standard Model
• Renormalization Group Evolution of the Standard Model Dimension Six Operators I: Formalism and lambda Dependence
• FeynCalc 9.3: New features and improvements
• Physics of leptoquarks in precision experiments and at particle colliders
• Searches for Lepton Flavor Violation in the Decays tau -> e gamma and tau -> mu gamma
• The Belle II Physics Book
• Future Physics Programme of BESIII
• The Standard Model as an Effective Field Theory
• B-physics anomalies: a guide to combined explanations
• Search for Lepton Flavor Violating Tau Decays into Three Leptons with 719 Million Produced Tau+Tau- Pairs
• Detailed calculation of lepton flavor violating muon-electron conversion rate for various nuclei
• The chiral representation of the $\pi N$ scattering amplitude and the pion-nucleon sigma term
• Low-Energy Effective Field Theory below the Electroweak Scale: Operators and Matching
• Effective field theory approach to $b\to s\ell {\ell }^{(\prime )}$, $B\to K^{(\ast )}\nu \bar{\nu }$ and $B\to D^{(\ast )}\tau \nu$ with third generation couplings
• The design of the MEG II experiment
• Simultaneous Explanation of the $R_K$ and $R(D^{(\ast )})$ Puzzles
• Lepton Flavor Violation in B Decays?
• Low-Energy Effective Field Theory below the Electroweak Scale: Anomalous Dimensions
• High-precision determination of the pion-nucleon $\sigma$-term from Roy-Steiner equations
• The Scalar Strange Content of the Nucleon from Lattice QCD
• Wilson: a Python package for the running and matching of Wilson coefficients above and below the electroweak scale
• Anatomy and Phenomenology of mu-tau Lepton Flavour Violation in the MSSM
• Review of Lepton Universality tests in B decays
• Revisiting Lepton Flavour Universality in B Decays
• Bottomonium Mesons and Strategies for Their Observation
• Lepton Flavor Violation in the Standard Model with general Dimension-Six Operators
• Renormalisation-group improved analysis of $\mu \to e$ processes in a systematic effective-field-theory approach
• What is the scale of new physics behind the $B$-flavour anomalies?
• A Global Likelihood for Precision Constraints and Flavour Anomalies
• On the model discriminating power of mu -> e conversion in nuclei
• Constraints on two-lepton, two quark operators
• Lattice QCD and QCD Sum Rule determination of the decay constants of eta_c, J/psi and hc states
• The ${\rm Y}$ and ${{\rm Y}}^{\prime }$ Leptonic Widths, $a_{\mu }^b$ and $m_b$ from full lattice QCD
• $B$ Flavour Anomalies: 2021 Theoretical Status Report
• Improved predictions for $\mu \to e$ conversion in nuclei and Higgs-induced lepton flavor violation
• Charmonium properties from lattice QCD + QED: hyperfine splitting, $J/\psi$ leptonic width, charm quark mass and $a_{\mu }^c$
• Search for lepton-flavor-violating tau-lepton decays to $\ell \gamma$ at Belle
• Charged Lepton Flavor Violation at the EIC
• Revisiting charmless hadronic B decays to scalar mesons
• Search for Lepton-Flavor-Violating tau Decays into a Lepton and a Vector Meson
• Lepton Flavor Violation and Dilepton Tails at the LHC
• Search for Lepton Flavor Violating Decays ${\tau }^{\pm }\to {\ell }^{\pm }{\pi }^0,{\ell }^{\pm }\eta ,{\ell }^{\pm }{\eta }^{\prime }$
• On Unitarity Based Relations Between Various Lepton Family Violating Processes
• Lepton flavor violating decays of vector quarkonia and of the $Z$ boson
• Lepton flavor violating quarkonium decays
• Direct probes of flavor-changing neutral currents in $e^{+}{e}^{-}$ collisions
• Search for the Lepton Flavor Violation Processes $J/\psi \to$ $\mu \tau$ and $e\tau$
• Search for Charged Lepton Flavor Violation in Narrow Upsilon Decays
• Search for lepton-flavor-violation in $Z$-boson decays with $\tau$-leptons with the ATLAS detector
• What is the scale of new physics behind the muon $g-2$?
• $\overline{\mathrm{MS}}$ renormalization of $S$-wave quarkonium wavefunctions at the origin
• Lepton flavor violating decays of vector mesons
• Bottomonium precision tests from full lattice QCD: hyperfine splitting, ${\rm Y}$ leptonic width and $b$ quark contribution to $e^{+}{e}^{-}\to$ hadrons
• Search for the charged lepton flavor violating decay $J/\psi \to e\tau$
• Renormalisation of the tensor current in lattice QCD and the $J/\psi$ tensor decay constant
• Next-to-leading order scalar contributions to $\mu \to e$ conversion
• A Case Study of the Sensitivity to LFV Operators with Precision Measurements and the LHC
• Constraints on 2l2q operators from $\mu -e$ flavour-changing meson decays
• Flavour alignment of New Physics in light of the $(g-2{)}_{\mu }$ anomaly
• Isotope dependence of muon-to-electron conversion
• Radiative lepton flavor violating B, D, and K decays
• Bounds on lepton flavor violating physics and decays of neutral mesons from $\tau (\mu )\to 3\ell ,\ell \gamma \gamma$-decays
• The implication of $J/\psi \to (\gamma +)\mathrm{invisible}$ for the effective field theories of neutrino and dark matter
• Parity and Time Reversal in J/Psi Decay
• Quarkonium Polarization in Lepton Annihilation
• Probe of new light Higgs bosons from bottomonium chi_{b0} decay
• RGE effects on the LFV scale from meson decays

Cited by in corpus (8)

• Flavor physics in SU(5) GUT with scalar fields in the 45 representation
• SMEFT analysis of charged lepton flavor violating $B$-meson decays
• The lepton flavor violating decays of vector mesons in the MRSSM
• Constraints on lepton-flavor mixing with third-generation new physics
• Search for the charged lepton flavor violating decay $\psi (3686)\to e^{\pm }{\mu }^{\mp }$
• Constraining lepton flavor violating SMEFT $2q2\ell$ operators from low-energy cLFV processes
• Exploring hadronic de-excitation via Lepton Flavor Violation
• Revisiting lepton flavor violation: $\tau$ and meson decays