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• W3172760435 abstract "A bstract b → sτ + τ − measurements are highly motivated for addressing lepton-flavor-universality (LFU)-violating puzzles such as $$ {R}_{K^{left(ast right)}} $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mi>R</mml:mi> <mml:msup> <mml:mi>K</mml:mi> <mml:mfenced> <mml:mo>∗</mml:mo> </mml:mfenced> </mml:msup> </mml:msub> </mml:math> anomalies. The anomalies of $$ {R}_{D^{left(ast right)}} $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mi>R</mml:mi> <mml:msup> <mml:mi>D</mml:mi> <mml:mfenced> <mml:mo>∗</mml:mo> </mml:mfenced> </mml:msup> </mml:msub> </mml:math> and R J/ψ further strengthen their necessity and importance, given that the LFU-violating hints from both involve the third-generation leptons directly. Z factories at the future e − e + colliders stand at a great position to conduct such measurements because of their relatively high production rates and reconstruction efficiencies for B mesons at the Z pole. To fully explore this potential, we pursue a dedicated sensitivity study in four b → sτ + τ − benchmark channels, namely B 0 → K *0 τ + τ − , B s → ϕτ + τ − , B + → K + τ + τ − and B s → τ + τ − , at the future Z factories. We develop a fully tracker-based scheme for reconstructing the signal B mesons and introduce a semi-quantitative method for estimating their major backgrounds. The simulations indicate that branching ratios of the first three channels can be measured with a precision ∼ $$ mathcal{O} $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>O</mml:mi> </mml:math> (10 − 7 − 10 − 6 ) and that of B s → τ + τ − with a precision ∼ $$ mathcal{O} $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>O</mml:mi> </mml:math> (10 − 5 ) at Tera- Z . The impacts of luminosity and tracker resolution on the expected sensitivities are explored. The interpretations of these results in effective field theory are also presented." @default.
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• W3172760435 title "b → sτ+τ− physics at future Z factories" @default.
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• W3172760435 doi "https://doi.org/10.1007/jhep06(2021)064" @default.
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