Abstract

In this work we study the consistency of a possible non-vanishing coupling Hμτ smaller than 0.25% as pointed by the CMS collaborations [1], with measured lepton flavor violation processes involving quarkonium. We show that the most promising channel to confirm this excess is to look for the lepton flavor tau decay into a f0 and μ where the experimental limit could strongly improved with the new B factories as Belle II.

Highlights

  • INTRODUCTIONThe computation of Higgs-induced lepton flavor violation (LFV) in channel decays involving only charged leptons is even more intricate as the smallness of the lepton Yukawa couplings implies that higher loop contributions can be bigger than treelevel ones [11, 8]

  • In 2015, CMS and ATLAS Collaborations have observed a slight excess of signal events with a significance of 2.4 standard deviations which can be interpreted as Higgs particles decaying into a muon and tau leptons: Br(H → μτ ) = 0.84−+00..3397 % [2], (1)0.77 ± 0.62 % [3].Recently, CMS and ATLAS Collaborations studied the upper limit on this branching ratio to obtain the following results: Br(H → μτ )CMS < 0.25% [1], (2)Br(H → μτ )AT LAS < 0.28% [4], respectively1

  • We study the consistency of a possible nonvanishing coupling Hμτ smaller than 0.25% as pointed by the CMS Collaboration [1], with measured lepton flavor violation processes involving quarkonium

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Summary

INTRODUCTION

The computation of Higgs-induced lepton flavor violation (LFV) in channel decays involving only charged leptons is even more intricate as the smallness of the lepton Yukawa couplings implies that higher loop contributions can be bigger than treelevel ones [11, 8]. To avoid this problem, we shall study the effect of the LFV H → τ μ coupling in processes involving quarkonium. Sterile Majorana neutrinos induces γlilj and Zlilj LFV couplings at one loop and W W lilj LFV couplings at tree level These couplings produce LFV effects in quarkonia decay studied in [12]. We shall show that even if the expected branching ratios are still below the experimental limit, some of them could be accessible to the generation of B factories as Belle II

GENERAL QUARKONIUM FORMALISM
HIGGS-QUARKONIUM COUPLING
NUMERICAL RESULTS
CONCLUSION
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