Abstract

Search for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mrow><mml:mi>τ</mml:mi></mml:mrow><mml:mrow><mml:mo>±</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mo>ℓ</mml:mo></mml:mrow><mml:mrow><mml:mo>∓</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math> ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>ℓ</mml:mo><mml:mo>=</mml:mo><mml:mi>e</mml:mi></mml:math> , <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>μ</mml:mi></mml:mrow></mml:math> ) with a hadronic tagging method at Belle

Highlights

  • The lepton-flavor-violating decays B0 → τÆl∓ [1], where l 1⁄4 ðe; μÞ, are promising modes in which to search for new physics

  • We present a search for the lepton-flavor-violating decays B0 → τÆl∓, where l 1⁄4 ðe; μÞ, using the full data sample of 772 × 106 BBpairs recorded by the Belle detector at the KEKB asymmetric-energy eþe− collider

  • We find no evidence for B0 → τÆl∓ decays and set upper limits on their branching fractions at 90% confidence level of BðB0 → τÆμ∓Þ < 1.5 × 10−5 and BðB0 → τÆe∓Þ < 1.6 × 10−5

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Summary

INTRODUCTION

The lepton-flavor-violating decays B0 → τÆl∓ [1], where l 1⁄4 ðe; μÞ, are promising modes in which to search for new physics. The decay can occur in principle via neutrino mixing [9]; the rate due to such mixing [10] is considerably below current or future experimental sensitivities. Observing these decays would indicate new physics. The general flavor-universal minimal supersymmetric Standard Model predicts branching fractions of up to about 2 × 10−10 [12]. These decay modes have previously been studied by the CLEO [13], BABAR [14], and LHCb [15] experiments.

DATASET AND DETECTOR DESCRIPTION
EVENT SELECTION
Tag-side selection
Signal-side selection
Background
Control samples
UPPER LIMIT CALCULATION
SYSTEMATIC UNCERTAINTIES
Findings
SUMMARY

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