Analysis of $B_c\to \tau {\nu }_{\tau }$ at CEPC

Abstract

The precise determination of the $B_c\to \tau {\nu }_{\tau }$ branching ratio provides an advantageous opportunity for understanding the electroweak structure of the Standard Model, measuring the CKM matrix element $|V_{cb}|$ and probing new physics models. In this paper, we discuss the potential of measuring the processes of $B_c\to \tau {\nu }_{\tau }$ with $\tau$ decaying leptonically at the proposed Circular Electron Positron Collider (CEPC). We conclude that during the $Z$ pole operation, the channel signal can achieve five $\sigma$ significance with $\sim 10^9$ $Z$ decays, and the signal strength accuracies for $B_c\to \tau {\nu }_{\tau }$ can reach around 1% level at the nominal CEPC $Z$ pole statistics of one trillion $Z$ decays assuming the total $B_c\to \tau {\nu }_{\tau }$ yield is $3.6\times 10^6$. Our theoretical analysis indicates the accuracy could provide a strong constraint on the general effective Hamiltonian for the $b\to c\tau \nu$ transition. If the total $B_c$ yield can be determined to $\mathcal{O}(1\%)$ level of accuracy in the future, these results also imply $|V_{cb}|$ could be measured up to $\mathcal{O}(1\%)$ level of accuracy.

References in corpus (15)

• Evidence for an excess of B -> D(*) Tau Nu decays
• WHIZARD: Simulating Multi-Particle Processes at LHC and ILC
• Observation of the B_c Meson in p-bar p Collisions at sqrt{s} = 1.8 TeV
• Measurement of the ratio of the $B^0\to D^{\ast -}{\tau }^{+}{\nu }_{\tau }$ and $B^0\to D^{\ast -}{\mu }^{+}{\nu }_{\mu }$ branching fractions using three-prong $\tau$-lepton decays
• The lifetime of the $B_c^{-}$ meson and the anomalies in $B\to D^{(\ast )}\tau \nu$
• Observation of B_c Mesons in p-bar p Collisions at sqrt{s} = 1.8 TeV
• B_c Decays and Lifetime in QCD Sum Rules
• B-meson decay constants: a more complete picture from full lattice QCD
• Revisiting the one leptoquark solution to the $R(D^{(\ast )})$ anomalies and its phenomenological implications
• Footprints of New Physics in $b\to c\tau \nu$ Transitions
• Reconstruction of physics objects at the Circular Electron Positron Collider with Arbor
• Lepton identification at particle flow oriented detector for the future $e^{+}{e}^{-}$ Higgs factories
• The QCD NLO Corrections to Inclusive $B_c^{\ast }$ Production in $Z^0$ Decays
• The Contribution of Bc Mesons to the Search for B->tau nu Decays at LEP
• Measuring B -> tau nu and B_c -> tau nu at the Z peak

Cited by in corpus (13)

• Measurement of Differential Distributions of $B\to D^{\ast }\ell {\bar{\nu }}_{\ell }$ and Implications on $|V_{cb}|$
• Global fit to $b\to c\tau \nu$ anomalies as of Spring 2024
• Correlating $B\to K^{(\ast )}\nu \bar{\nu }$ and flavor anomalies in SMEFT
• Prospects for $B_c^{+}$ and $B^{+}\to {\tau }^{+}{\nu }_{\tau }$ at FCC-ee
• Heavy-quark opportunities and challenges at FCC-ee
• $b\to s{\tau }^{+}{\tau }^{-}$ Physics at Future $Z$ Factories
• New Physics Search at the CEPC: a General Perspective
• Flavor Physics at the CEPC: a General Perspective
• Testing Lepton Flavor Universality at the Electron-Ion Collider
• Cluster Counting Algorithm for the CEPC Drift Chamber using LSTM and DGCNN
• Effect of $K^0-{\bar{K}}^0$ Mixing on CP and CPT Violations in $B_c^{\pm }\to B^{\pm }{K}_{S,L}^0$ Decays
• Particle-level transformers for 95 GeV Higgs boson searches at future $e^{+}{e}^{-}$ Higgs factories
• Search for $B_c^{+}\to {\pi }^{+}{\mu }^{+}{\mu }^{-}$ decays and measurement of the branching fraction ratio $\mathcal{B}(B_c^{+}\to \psi (2S){\pi }^{+})/\mathcal{B}(B_c^{+}\to J/\psi {\pi }^{+})$