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Table 14: Experimental upper limits on lepton flavor violating τ decays. The modes are grouped according to the particle content of their final states. Modes with lepton number violation are labeled with “(L)”, modes with baryon number violation are labeled with “(BNV)”.

Decay mode	Category	90% CL Limit		Exp.	Ref.
Γ156 =  e− γ	lγ	<	12.0 · 10−8	Belle	[85]
		<	3.3 · 10−8	BaBar	[86]
Γ157 =  µ− γ		<	4.5 · 10−8	Belle	[85]
		<	4.4 · 10−8	BaBar	[86]
Γ158 =  e− π0	lP0	<	2.2 · 10−8	Belle	[87]
		<	13.0 · 10−8	BaBar	[88]
Γ159 =  µ− π0		<	2.7 · 10−8	Belle	[87]
		<	11.0 · 10−8	BaBar	[88]
Γ162 =  e− η		<	4.4 · 10−8	Belle	[87]
		<	16.0 · 10−8	BaBar	[88]
Γ163 =  µ− η		<	2.3 · 10−8	Belle	[87]
		<	15.0 · 10−8	BaBar	[88]
Γ172 =  e− η′(958)		<	3.6 · 10−8	Belle	[87]
		<	24.0 · 10−8	BaBar	[88]
Γ173 =  µ− η′(958)		<	3.8 · 10−8	Belle	[87]
		<	14.0 · 10−8	BaBar	[88]
Γ160 =  e− KS0		<	2.6 · 10−8	Belle	[89]
		<	3.3 · 10−8	BaBar	[90]
Γ161 =  µ− KS0		<	2.3 · 10−8	Belle	[89]
		<	4.0 · 10−8	BaBar	[90]
Γ174 =  e− f0(980)	l S0	<	3.2 · 10−8	Belle	[91]
Γ175 =  µ− f0(980)		<	3.4 · 10−8	Belle	[91]
Γ164 =  e− ρ0	l V0	<	1.8 · 10−8	Belle	[92]
		<	4.6 · 10−8	BaBar	[93]
Γ165 =  µ− ρ0		<	1.2 · 10−8	Belle	[92]
		<	2.6 · 10−8	BaBar	[93]
Γ168 =  e− K*(892)0		<	3.2 · 10−8	Belle	[92]
		<	5.9 · 10−8	BaBar	[93]
Γ169 =  µ− K*(892)0		<	7.2 · 10−8	Belle	[92]
		<	17.0 · 10−8	BaBar	[93]
Γ170 =   e−  K *(892)0		<	3.4 · 10−8	Belle	[92]
		<	4.6 · 10−8	BaBar	[93]
Γ171 =   µ−  K *(892)0		<	7.0 · 10−8	Belle	[92]
		<	7.3 · 10−8	BaBar	[93]
Γ176 =  e− φ		<	3.1 · 10−8	Belle	[92]
		<	3.1 · 10−8	BaBar	[93]
Γ177 =  µ− φ		<	8.4 · 10−8	Belle	[92]
		<	19.0 · 10−8	BaBar	[93]
Γ166 =  e− ω		<	4.8 · 10−8	Belle	[92]
		<	11.0 · 10−8	BaBar	[94]
Γ167 =  µ− ω		<	4.7 · 10−8	Belle	[92]
		<	10.0 · 10−8	BaBar	[94]
Γ178 =  e− e+ e−	lll	<	2.7 · 10−8	Belle	[95]
		<	2.9 · 10−8	BaBar	[96]
Γ181 =  µ− e+ e−		<	1.8 · 10−8	Belle	[95]
		<	2.2 · 10−8	BaBar	[96]
Γ179 =  e− µ+ µ−		<	2.7 · 10−8	Belle	[95]
		<	3.2 · 10−8	BaBar	[96]
Γ183 =  µ− µ+ µ−		<	2.1 · 10−8	Belle	[95]
		<	3.3 · 10−8	BaBar	[96]
		<	4.6 · 10−8	LHCb	[97]
Γ182 =  e− µ+ e−		<	1.5 · 10−8	Belle	[95]
		<	1.8 · 10−8	BaBar	[96]
Γ180 =  µ− e+ µ−		<	1.7 · 10−8	Belle	[95]
		<	2.6 · 10−8	BaBar	[96]
Γ184 =  e− π+ π−	lhh	<	2.3 · 10−8	Belle	[98]
		<	12.0 · 10−8	BaBar	[99]
Γ186 =  µ− π+  π−		<	2.1 · 10−8	Belle	[98]
		<	29.0 · 10−8	BaBar	[99]
Γ188 =  e− π+ K−		<	3.7 · 10−8	Belle	[98]
		<	32.0 · 10−8	BaBar	[99]
Γ194 =  µ− π+  K−		<	8.6 · 10−8	Belle	[98]
		<	26.0 · 10−8	BaBar	[99]
Γ189 =  e− K+ π−		<	3.1 · 10−8	Belle	[98]
		<	17.0 · 10−8	BaBar	[99]
Γ195 =  µ− K+  π−		<	4.5 · 10−8	Belle	[98]
		<	32.0 · 10−8	BaBar	[99]
Γ192 =  e− K+ K−		<	3.4 · 10−8	Belle	[98]
		<	14.0 · 10−8	BaBar	[99]
Γ198 =  µ− K+  K−		<	4.4 · 10−8	Belle	[98]
		<	25.0 · 10−8	BaBar	[99]
Γ191 =  e− KS0 KS0		<	7.1 · 10−8	Belle	[89]
Γ197 =  µ− KS0  KS0		<	8.0 · 10−8	Belle	[89]
Γ185 =  e+ π− π−	(L)	<	2.0 · 10−8	Belle	[98]
	(L)	<	27.0 · 10−8	BaBar	[99]
Γ187 =  µ+ π− π−	(L)	<	3.9 · 10−8	Belle	[98]
	(L)	<	7.0 · 10−8	BaBar	[99]
Γ190 =  e+ π− K−	(L)	<	3.2 · 10−8	Belle	[98]
	(L)	<	18.0· 10−8	BaBar	[99]
Γ196 =  µ+ π− K−	(L)	<	4.8 · 10−8	Belle	[98]
	(L)	<	22.0 · 10−8	BaBar	[99]
Γ193 =  e+ K− K−	(L)	<	3.3 · 10−8	Belle	[98]
	(L)	<	15.0 · 10−8	BaBar	[99]
Γ199 =  µ+ K− K−	(L)	<	4.7 · 10−8	Belle	[98]
	(L)	<	48.0 · 10−8	BaBar	[99]
Γ211 =   π− Λ	BNV	<	3.0 · 10−8	Belle	[100]
		<	5.8 · 10−8	BaBar	[101]
Γ212 =    π−  Λ		<	2.8 · 10−8	Belle	[100]
		<	5.9 · 10−8	BaBar	[101]
Γ213 =   K− Λ		<	4.2 · 10−8	Belle	[100]
		<	15.· 10−8	BaBar	[101]
Γ214 =    K−  Λ		<	3.1 · 10−8	Belle	[100]
		<	7.2 · 10−8	BaBar	[101]
Γ215 =   p µ− µ−		<	44.0 · 10−8	LHCb	[102]
Γ216 =     p  µ+ µ−		<	33.0 · 10−8	LHCb	[102]

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