Search for Lepton- Flavor- Viola4ng (LFV) Decays of the Higgs Boson

Transcription

1 Sarch for Lpton- Flavor- Viola4ng (LFV) Dcays of th Higgs Boson Colin Jssop for th CMS Collaboration Jun 12, 215 CMS: Physics Analysis Summary: ATLAS: An indpndnt r-intrprtation of SM H->ττ is in th litratur (Harnik,Zupan and Kopp JHEP 133 (213) 26)

2 Invs4ga4ng th Higgs Propr4s 2 Higgs discovrd with mass ~125 GV ( Obsrvd in Standard Modl dcays H τ τ H ZZ H WW H γ γ Ar thr non-standard Modl dcay mods of th 125 GV Higgs Boson? SM H τ τ τ H τ LFV H µ τ μ H τ

3 An Extnsiv Litratur on possibl LFV Higgs Dcays 3 Som nw physics modls may allow for LFV dcays of Higgs including composit Higgs modls, modls with multipl Higgs doublts, non-rnormalizabl modls valid to up to a finit mass scal and many othrs. Existing constraints on LFV coupling constants from indirct procsss τà µγ, τà 3µ, muon g-2, allow BR(Hà τµ) = ~1% J. D. Bjorkn and S.Winbrg, Mchanism for Nonconsrvation of Muon Numbr, Phys. Rv. Ltt. 38 (Mar, 1977) , doi:1.113/physrvltt , K. Agash and R. Contino, Composit Higgs-Mdiatd FCNC, Phys.Rv. D8 (29) 7516, doi:1.113/physrvd , arxiv: , A. Azatov, M. Toharia, and L. Zhu, Higgs Mdiatd FCNC s inwarpd Extra Dimnsions, Phys.Rv. D8 (29) 3516, doi:1.113/physrvd , arxiv: , H. Ishimori t al., Non-Ablian Discrt Symmtris in Particl Physics, Prog.Thor.Phys.Suppl. 183 (21) 1 163, doi:1.1143/ptps , arxiv: , G. Prz and L. Randall, Natural Nutrino Masss and Mixings fromwarpd Gomtry, JHEP 91 (29) 77, doi: 1.188/ /29/1/77, arxiv: , G. Blanknburg, J. Ellis, and G. Isidori, Flavour-Changing Dcays of a 125 GV Higgs-lik Particl, Phys.Ltt. B712 (212) , doi:1.116/j.physltb , arxiv: , R. Harnik, J. Kopp, and J. Zupan, Flavor Violating Higgs Dcays, JHEP 133 (213) 26, doi:1.17/jhep3(213)26, arxiv:

4 Data St 4 CS,ntgratd LumLnoVLty, SS, 212, p s = 8 TV Proton-Proton collisions at cntr of mass nrgy 8 TV 19.7 fb of 212 data usd 5 ns bunch spacing 21 avrag intractions pr bunch crossing. Known as pil up 5cRrdd /umlnrslty (pb 1 /.4) 7RtDO IntHJUDtHd LumLnRsLty (fb 1 ) DDtD includd fuom :37 to :49 U7C LHC DHOLvHUHd: 23.3 fb 1 CS 5HcRUdHd: fb 1 1 Dy 1 Jun 1 JuO 1 AuJ 1 SHS 1 2ct 1 1Rv DDtH (U7C) CS Avrag PiluS, SS, 212, p s = 8 TV 1 DHc <µ> an numbr Rf LntractLRns pr crrsslng

5 Higgs Produc4on in 8 TV pp collisions 5 Gluon Gluon Fusion Vctor Boson Fusion σ produc4on 19.3 Q (9%) 1.6 Q (7%) Diffrnt produc4on mchanisms dis4nguishd by numbr of jts in vnt.

6 Two Channls ach with thr Catgoris 6 Two channls ar studid: Hà τ µ and Hà τ µ Each channl is sparatd into, 1, and 2 jt catgoris and 1 jt corrsponds to GG Higgs production 2 jt corrsponds to VBF Higgs production

7 Similari4s and diffrncs to SM H- >ττ sarchs 7 LFV Hà τ µ and Hà τ µ ar similar to SM Hà τ τ µ and Hà τ τ rspctivly. Thus hav similar background sourcs to th SM procsss. Muon is prompt thus has highr momntum than in SM Fwr nutrinos giv diffrnt missing nrgy and topology. SM vs LFV in simulation σ x Br [pb] / 5 GV CMS prliminary µ τ 1 - h τ + τ h τ µ s = 8 TV σ x Br [pb] /.7 1 CMS prliminary µ τ 1 - h τ + τ h τ µ s = 8 TV µ P T [GV] φ (τ,σν) Standard Modl sarchs not vry snsi4v bcaus of diffrnt kinma4cs

8 Slc4on Variabls 8 µ,, τ p T cuts: Lptons from signal procss ar xpctd to b gnrally highr than many backgrounds Δϕ cuts: Signal µ and τ ar back-to-back in ϕ, additionally MET is nar τ in ϕ Transvrs Mass cuts: Invariant mass formd using transvrs componnts of on lpton and missing nrgy. Usd for sparation of diffrnt procsss that hav similar lpton+met but diffrnt mothr particls. linar cuts (no MVA s) optimizd for S/ (S+B) with signal rgion blindd

9 Signal Variabl Collinar Mass (M col ) 9 Visibl dcay products Collinar Mass rducs bias and improvs rsolu4on vrsus visibl Mass Approximat nutrino as collinar with th tau 1 Normalizd to 1 Evnts / 1 GV.35 LFV VBF Higgs µτ Mass CMS prliminary m vis σ vis m col σ col 19.7 fb, LFV VBF Higgs Collinar Mass = 12. GV =.151 = 125. GV =.143 s = 8 TV [GV] Signal rgion 1 < M col < 15 GV

10 Signal Variabl Collinar Mass (M col ) 1 Visibl dcay products Collinar Mass rducs bias and improvs rsolu4on vrsus visibl Mass Approximat nutrino as collinar with th tau 1 Normalizd to 1 Evnts / 1 GV.35 LFV VBF Higgs µτ Mass CMS prliminary m vis σ vis m col σ col 19.7 fb, LFV VBF Higgs Collinar Mass = 12. GV =.151 = 125. GV =.143 s = 8 TV [GV] Signal rgion 1 < M col < 15 GV blindd

11 Background Ovrviw 11 Z τ τ: Normalization from MC simulation Shap: Embddd tau sampl Evnts / 1 GV CMS prliminary Signal x fb, s = 8 TV Obsrvd Bkg. Uncrtaintis SM H ττ/ww Z ττ (mbdding) + - Z l l (not τ τ µ ) Singl Top (tw) tt + Jts EWK Di-Boson Wγ to l ν γ Wγ * to l ν γ Faks GGF LFV H τ µ (BR=1.) VBF LFV H τ µ (BR=1.) C : Shap from MC simulations Normalization from control rgion (τ µ) or MC (τ µ) W+Jts/QCD Mul3jts: Fakrat Mthod using Antiisolatd lpton vnts (τ µ) or Anti-isolatd tau vnts (τ µ) Data-prd prd collinar M(µτ ) (GV) Z l + l -, Wjts+γ(*), SinglTop,...: Normalization and shap from MC simulation WW+Jts: Normalization(N LO) and shap from MC simulations

12 Zà ττ Background 12 Dominant background for Hà τ µ Zà ττ background via Particl Flow Embdding Zà µµ data with µ s rplacd by simulatd τ s Validatd by comparing to simulatd Zà ττ (τ µ) or nhancd Zà ττ control rgion ΔR µ-τ <.2 (τ µ) Pil Up Undrlying Evnt Z μ μ

13 Zà ττ Background 13 Dominant background for Hà τ µ Zà ττ background via Particl Flow Embdding Zà µµ data with µ s rplacd by simulatd τ s Validatd by comparing to simulatd Zà ττ (τ µ) or nhancd Zà ττ control rgion ΔR µ-τ <.2 (τ µ) Pil Up Undrlying Evnt Z τ τ Sim τ s

14 Faks Background 14 What is a fak signal? Signal μ VS W Fak ν μ τ jt jt Jts can appar to b lptons Fak rat masurd in Z µµ+x data and compard to MC

15 Faks Background 15 Dominant background for τ µ Faks background shap from rgion III Pass loos lpton iso but not tight Othr backgrounds subtractd (ngligibl) Masur fak rat indpndntly and apply to III to gt Signal Rgion I SS rgions II and IV usd to validat fak rat mthod. Dominatd by W+jts tight,μ loos /μ (anti-isolatd) Tight Iso Not Tight Iso Shap Rgion III (III) x Fakrat x ε Trig Signal IRgion (I) Signal Rgion! opposit sign (,μ) Opposit Sign x Fakrat x ε Trig Valida4on Validation Shap Rgion IV (II) Valida4on II Rgion (IV) lik sign (,μ) Lik Sign

16 Faks Background 16 Dominant background for τ µ Faks background shap from rgion III Pass loos lpton iso but not tight Othr backgrounds subtractd (ngligibl) Masur fak rat indpndntly and apply to II to gt Signal Rgion IV SS rgions II and IV usd to validat fak rat mthod. Dominatd by W+jts tight,μ loos /μ (anti-isolatd) Tight Iso Not Tight Iso Shap Rgion III (III) x Fakrat x ε Trig Signal IRgion (I) Signal Rgion! opposit sign (,μ) Opposit Sign x Fakrat x ε Trig Valida4on Validation Shap Rgion IV (II) Valida4on II Rgion (IV) lik sign (,μ) Lik Sign

17 Faks Sam Sign Valida4on 17 Evnts / 1 GV CMS Data, µτ Bckg stat uncrtainty Bckg syst uncrtainty Faks (jt τ) 19.7 fb (8 TV) LFV GG Higgs (Br=1%) LFV VBF Higgs (Br=1%) Evnts / 1 GV CMS 19.7 fb (8 TV) Data, µτ Bckg stat uncrtainty Bckg syst uncrtainty Faks (lpton) SM Higgs Z+ττ (mbddd) - Z+l + l Singl top quark tt VV Wγ / Wγ * LFV GG Higgs (Br=1%) LFV VBF Higgs (Br=1%) Data-Bckg Bckg collinar M(µτ ) [GV] Data-Bckg Bckg collinar M(µτ ) [GV] Validation sam sign rgion (II) shows good agrmnt in collinar mass for both channls

18 Prslc4on Agrmnt 18 Prslction is a st of minimal rquirmnts to giv wll dfind objcts and rlvant vnts Good agrmnt in prslction indicats backgrounds ar wll modld Signal shown x1 for visibility Evnts / 2 GV τ µ M coll CMS 1 Jt 19.7 fb Data, µτ Bckg Uncrtainty SM Higgs Z+ττ (mbddd) - Z+l + l tt Singl top quark (8 TV) tt VV Faks (jt τ) LFV GG Higgs (Br=1%) LFV VBF Higgs (Br=1%) Evnts / 1 GV CMS τ µ M coll 1 Jt 19.7 fb Data, µτ Bckg Uncrtainty SM Higgs Z+ττ (mbddd) - Z+l + l Singl top quark (8 TV) tt VV Wγ / Wγ * Faks (lptons) LFV GG Higgs (Br=1%) LFV VBF Higgs (Br=1%) Data-Bckg Bckg collinar M(µτ ) [GV] Data-Bckg Bckg collinar M(µτ ) [GV]

19 Establishing Signal /Shng Limits 19 Two main typs of uncrtaintis considrd Normalization (indpndnt of M col ), scal pak hight Shap (vary with M collinar ) distort pak shap 95% CL uppr limits on branching ratio ar st using th standard CMS asymptotic CL s mthod* Each background takn as a tmplat shap. Th data is fit with background only, and background plus signal. A liklihood mthod is usd to stimat th signal strngth which is usd to st limits *ATLAS and CMS Collaborations, LHC Higgs Combination Group, Procdur for th LHC Higgs boson sarch combination in Summr 211, Tchnical Rport ATL-PHYS-PUB 2111, CMS NOTE 211/5, 211.

20 Systma4cs 2 Indpndnt of τ µ τ µ Mthod M collinar Jt 1 Jt 2 Jt Jt 1 Jt 2 Jt Elc. Trig/ID/Iso 3% 3% 3% TnP, POG rc Muon Trig/ID/Iso 2% 2% 2% 2% 2% 2% TnP, POG rc Hadronic Tau Eff % 9% 9% TnP, POG rc Luminosity 2.6% 2.6% 2.6% 2.6% 2.6% 2.6% pix. clustr counting Z ττ 3+3*% 3+5*% 3+1*% 3+5*% 3+5*% 3+1*% masurd xsc Z µµ, 3% 3% 3% 3% 3% 3% masurd xsc Muon & Elc. Fak 4% 4% 4% SS sidband Tau Faks *% 3% 3% fak rat vs MC/ QCD, POG rc WW, ZZ +jts bkg. 15% 15% 15% 15% 15% 65% masurd xsc ttbar+jts 1% 1% 1+1*% 1% 1% 1% masurd xsc W+γ bkg 1% 1% 1% masurd xsc B-tagging vto 3% 3% 3% TnP Singl Top bkg. 1% 1% 1% 1% 1% 1% masurd xsc

21 Systma4cs 21 Thory Uncrtainty GGF VBF Jt 1 Jt 2 Jt Jt 1 Jt 2 Jt Parton Dnsity Function 9.7% 9.7% 9.7% 3.6% 3.6% 3.6% Rnormalization Scal 8% 1% 3% 4% 1.5% 2% Undrlying Evnt / Parton Showr 4% 5% 1% 1% % 1% Dpndnt on M collinar τ µ τ µ Hadronic Tau Enrgy Scal - 3% Jt Enrgy Scal 3-7% 3-7% Unclustrd Enrgy Scal 1% 1% Z τ τ Bias 1% - bin-by-bin uncrtainty

22 M coll Distribu4on Post- Fit: Hà τ μ 22 Jt 1 Jt 2 Jts Evnts / 1 GV CMS 19.7 fb Data, µτ Bckg Uncrtainty SM H Z+ττ (mbddd) + - Z+l l (not τ µ τ ) Singl top quark (8 TV) tt+jts VV Faks (jt τ) LFV Higgs (Br=.9%) Evnts / 1 GV CMS 19.7 fb Data, µτ Bckg Uncrtainty SM H Z+ττ (mbddd) + - Z+l l (not τ µ τ ) Singl top quark (8 TV) Evnts / 5 GV tt+jts VV Faks (jt τ) LFV Higgs (Br=.9%) CMS 19.7 fb Data, µτ Bckg Uncrtainty SM H Z+ττ (mbddd) + - Z+l l (not τ µ τ ) Singl top quark (8 TV) tt+jts VV Faks (jt τ) LFV Higgs (Br=.9%) Data-Bckg (fit) Bckg (fit) collinar M(µτ ) [GV] Data-Bckg (fit) Bckg (fit) Data-Bckg (fit) Bckg (fit) collinar M(µτ ) [GV] collinar M(µτ ) [GV] Distributions aftr fitting for signal + background. Signal shown in blu with bst fit branching ratio. Slight xcss in ach catgory but still consistnt within background uncrtaintis.

23 M coll Distribu4on Post- Fit: Hà τ μ 23 Jt 1 Jt 2 Jts Evnts / 1 GV CMS 19.7 fb Data, µτ Bckg Uncrtainty SM Higgs Z+ττ (mbddd) + - Z+l l (not τ µ τ ) Singl top quark tt+jts Wγ / Wγ * (8 TV) Evnts / 1 GV VV Fak lptons LFV Higgs (Br=.9%) CMS 19.7 fb Data, µτ Bckg Uncrtainty SM Higgs Z+ττ (mbddd) + - Z+l l (not τ µ τ ) Singl top quark tt+jts Wγ / Wγ * (8 TV) Evnts / 2 GV VV Fak lptons LFV Higgs (Br=.9%) CMS 19.7 fb Data, µτ Bckg Uncrtainty SM Higgs Z+ττ (mbddd) + - Z+l l (not τ µ τ ) Singl top quark tt+jts Wγ / Wγ * (8 TV) VV Fak lptons LFV Higgs (Br=.9%) Data-Bckg (fit) Bckg (fit) Data-Bckg (fit) Bckg (fit) collinar M(µτ ) [GV] collinar M(µτ ) [GV] Data-Bckg (fit) Bckg (fit) collinar M(µτ ) [GV] Distributions aftr fitting for signal + background. Signal shown in blu with bst fit branching ratio. Slight xcss in ach catgory but still consistnt within background uncrtaintis.

24 Wightd M coll Distribu4ons 24 Combind channls and catgoris bins wightd by significanc (S/(S+B)) S/(S+B) Wightd Evnts / 2 GV data-bg (fit) bg (fit) CMS prliminary 19.7 fb, s = 8 TV Data Bckg uncrtainty SM H Z+ττ (mbddd) + - Z+l l (not τ µ τ ) Singl top quark tt+jts VV Wγ, Wγ * Faks (jt τ,lpton) LFV Higgs, (Br=.9%) collinar M(µτ) [GV] S/(S+B) S/(S+B) Wightd Evnts / 2 / 2 GV data-bg (fit) bg (fit) CMS prliminary 19.7 fb, Data LFV H µτ signal (Br=.9%) Bckg uncrtainty SM H Bckg Z+ττ uncrtainty (mbddd) + - Z+l l (not τ µ τ ) Singl top quark Data-Background tt+jts VV Wγ, Wγ * Faks (jt τ,lpton) LFV Higgs, (Br=.9%) Bkg. Subtractd s = 8 TV collinar M(µτ) [GV] 1 2 3

25 Branching Ra4o Limits 25 Expctd (%) Obsrvd (%) Bst Fit (%) τµ <.75 (±.38) < Combind xcss is 2.5 standard dviations which corrsponds to local p-valu of.7 at M H =125 GV

26 Limit: Yukawa Coupling 26 Yukawa couplings govrning LFV Higgs: Γ( h α β ) = m ( h 8π Y α β 2 + Y β α 2 ) Rintrprting BR limit into Yukawa coupling limit with BR <.89% givs: τµ Y CMS τ 3µ τ µ γ obsrvd xpctd h µτ 2 Y µτ Yτµ =m m τ /v µ LHC h ττ 19.7 fb (8 TV) Y µτ 2 + Yτµ 2 < BR<.1% -3 1 BR<1% BR<1% -2 1 BR<5% 1 1 Y µτ

27 Outlook 27 CMS Run 1 papr on H- >τ and H - > µ will b submikd in a fw wks. (Th papr is undr intrnal rviw but unfortunatly not rady for this confrnc) ATLAS will hav rsults on LFV Higgs sarch for th summr confrncs CMS: A nw tau lpton idn4fica4on algorithm with improvd background rjc4on has bn dployd for Run 2 (which startd last wk). W intnd to apply this to xis4ng 7 TV data and combin with ~1 Q- 1 of run 2 data for our first updat

28 Conclusions 28 First dirct, ddicatd sarch for LFV 125 GV limit is approximatly an ordr of magnitud tightr than prvious limits Slight xcss with 2.5σ significanc Intrprtd as a statistical fluctuation givs a constraint of B(H µ τ) < 1.57% at 95% confidnc lvl Intrprtd as a signal, th bst fit branching fraction is B(H µ τ) =.89% tau rsults coming soon. Invstigating possibl analysis improvmnts for µ-tau bfor nxt run

29 Back Up

30 Compact Muon Solnoid 3

31 Thor4cal 31 Two Higgs doublts, xtra dimnsions, and composit modls can all hav LFV Higgs intractions Hà τµ and Hà τ can hav ordr BR(1%) undr currntly low nrgy constraints. Off diagonal lmnts of Y ij that ar too larg ffct a nd for fin tuning. Avoidd if: Y τµ Y µτ m µ m τ v 2

32 Exis4ng Limits 32 Rintrprtd ATLAS rsult of Hà ττ by Harnik t al.

33 Exis4ng Limits 33 LFV Lagrangian trms: L V Y τµ τ L µ R h... Branching Ratio Assum Γ SM = 4.1 MV thn dcay width:

34 Data Sampls & Triggrs 34 Mont Carlo simulation sts (full list in backup) Corrctions for Triggr fficincis and lctron and muon ID/ ISO Pilup r-wighting is usd to rmov nrgy from pil up Pilup jt claning to rduc jts from pilup Hà τ µ utilizs a singl muon triggr whil Hà τ µ uss Muon + lctron cross triggr

35 Ovrviw: Data 35

36 Transvrs Mass 36 Dfind as M 2 T = E 2 T,total p 2 T,total Whr Transvrs Enrgy for ach particl is: E T 2 = m 2 + p T 2 M T M allowing obsrvation of M vn with invisibl dcay products. H τ τ ν ν

37 Prslc4on Rquirmnts 37 Lptons (, µ) Minimum pt cuts Dtctor accptanc cuts Isolation critria Idntification critria Evnt Lptons oppositly chargd Vto xtra isolatd lptons Non-ovrlapping lptons and jts Particl Flow Objcts Triggr on muons or muons+lctrons Jts (including τ ) Minium pt cuts Dtctor accptanc cuts ID rquirmnts corrctd for pil-up, ta, and pt dpndnc jts from b quarks vtod Missing Transvrs Enrgy Jt nrgy corrctd

38 Prslc4on Agrmnt 38 Prslction is a st of minimal rquirmnts to giv wll dfind objcts and rlvant vnts Good agrmnt in prslction indicats backgrounds ar wll modld Signal shown x1 for visibility Evnts / 2 GV τ µ M coll CMS 1 Jt 19.7 fb Data, µτ Bckg Uncrtainty SM Higgs Z+ττ (mbddd) - Z+l + l tt Singl top quark (8 TV) tt VV Faks (jt τ) LFV GG Higgs (Br=1%) LFV VBF Higgs (Br=1%) Evnts / 1 GV CMS τ µ M coll 1 Jt 19.7 fb Data, µτ Bckg Uncrtainty SM Higgs Z+ττ (mbddd) - Z+l + l Singl top quark (8 TV) tt VV Wγ / Wγ * Faks (lptons) LFV GG Higgs (Br=1%) LFV VBF Higgs (Br=1%) Data-Bckg Bckg collinar M(µτ ) [GV] Data-Bckg Bckg collinar M(µτ ) [GV]

39 Signal Variabl and Rgion 39 Collinar Mass approximat nutrino as collinar and dfin visibl fraction of tau momntum p T ν = E T miss ˆp T τ vis x τ vis = approximat Higgs mass is thn: M collinar = M vis x τ vis givs sharp mass pak cntrd nar 125 GV Signal rgion dfind as 1 GV < M collinar < 15 GV p T τ vis p T τ vis Analysis was don with signal rgion blindd + p T ν

40 Using fak rat to gt background 4 Look at data in rgion that fulfills all signal slction critria EXCEPT tight isolation spcifically passing loos isolation but NOT tight isolation Wighting this rgion by a factor basd on fak rat scals th background to match what it would b, wr thr no faks. f = N tight N loos 1 f = N NOT tight N loos N loos = N NOT tight 1 f N tight = f N loos N tight = N NOT tight f 1 f

41 Prslc4on Agrmnt (BR = 1%) 41 τ µ Evnts / 1 GV CMS Jt 19.7 fb (8 TV) 1 Jt 19.7 fb (8 TV) 2 Jts Data, µτ Bckg Uncrtainty SM Higgs Z+ττ (mbddd) - Z+l + l tt Singl top quark tt VV Faks (jt τ) LFV GG Higgs (Br=1%) LFV VBF Higgs (Br=1%) Evnts / 2 GV CMS Data, µτ Bckg Uncrtainty SM Higgs Z+ττ (mbddd) - Z+l + l tt Singl top quark tt VV Faks (jt τ) LFV GG Higgs (Br=1%) LFV VBF Higgs (Br=1%) Evnts / 1 GV CMS 19.7 fb Data, µτ Bckg Uncrtainty SM Higgs Z+ττ (mbddd) - Z+l + l tt Singl top quark (8 TV) tt VV Faks (jt τ) LFV GG Higgs (Br=1%) LFV VBF Higgs (Br=1%) τ µ Evnts / 1 GV Data-Bckg Bckg fb 6 collinar M(µτ CMS Data-Bckg Bckg Data, µτ Bckg Uncrtainty SM Higgs Z+ττ (mbddd) - Z+l + l Singl top quark (8 TV) ) [GV] tt VV Wγ / Wγ * Faks (lptons) LFV GG Higgs (Br=1%) LFV VBF Higgs (Br=1%) collinar M(µτ ) [GV] Evnts / 1 GV Data-Bckg Bckg fb 2 collinar M(µτ CMS 18 Data-Bckg Bckg Data, µτ Bckg Uncrtainty SM Higgs Z+ττ (mbddd) - Z+l + l Singl top quark (8 TV) ) [GV] tt VV Wγ / Wγ * Faks (lptons) LFV GG Higgs (Br=1%) LFV VBF Higgs (Br=1%) collinar M(µτ ) [GV] Evnts / 1 GV Data-Bckg Bckg Data-Bckg Bckg fb 7 collinar M(µτ CMS Data, µτ Bckg Uncrtainty SM Higgs Z+ττ (mbddd) - Z+l + l Singl top quark (8 TV) ) [GV] tt VV Wγ / Wγ * Faks (lptons) LFV GG Higgs (Br=1%) LFV VBF Higgs (Br=1%) collinar M(µτ ) [GV]

42 Full Slc4on 42 Variabl H τ µ H τ µ Jt 1 Jt 2 Jt Jt 1 Jt 2 Jt µ p T > [GV] p T > [GV] τ p T > [GV] Δϕ µ-τ > Δϕ -MET < Δϕ -µ > M T () < [GV] M T (µ) > [GV] M T (τ) < [GV] Δη jt jt > M jts Optimizd for S/ (S+B)

43 Evnt Yilds: Full Slc4on 43 Sampl τ µ τ µ Jt 1 Jt 2 Jt Jt 1 Jt 2 Jt Faks 41.5 ± ± ± ± ±11.5 ±.5 Z τ τ 65. ± ± ± ± ± ±.2 ZZ, WW 4.8 ± ± ± ± ± ±.2 Wγ 2. ± ± Z or µµ 1.6 ± ± ± ± ±.1 ttbar 4.8 ±.7 3. ± ± ± ± ±.3 t, tbar 1.9 ± ±.8.2 ± ± ± ±.5 SM Higgs 1.9 ± ±.2.6 ±.1 7. ± ± ±.7 Sum of bkg 159.4± ± ± ± ± ± 1.1 LFV Higgs Sig ± ± ± ± ± ± 1. Data 18 ± ± ± ± ± ± 2.8

44 Branching Ra4o Limits 44 Expctd Limits Jt (%) 1 Jt (%) 2 Jt (%) τ µ < 1.32 (±.67) < 1.66 (±.85) < 3.77 (±1.92) τ µ < 2.35 (±1.2) < 2.1 (±1.7) < 1.94 (±.99) τµ <.75 (±.38) Obsrvd Limits τ µ <2.4 < 2.38 < 3.84 τ µ < 2.94 < 2.11 < 3.29 τµ < 1.57 Bst Fit Branching Ratio τ µ τ µ τµ

45 Branching Ra4o Limits 45 Combind xcss is 2.5 standard dviations which corrsponds to local p-valu of.7 at M H =125 GV µτ 2.35% (xp.) 2.94% (obs.) µτ µτ, Jts, 1 Jt 2.1% (xp.) 2.11% (obs.), 2 Jts 1.95% (xp.) 3.29% (obs.) µτ, Jts 1.32% (xp.) 2.4% (obs.) µτ, 1 Jt 1.66% (xp.) 2.38% (obs.) µτ, 2 Jts 3.77% (xp.) 3.84% (obs.) h µτ.75% (xp.) 1.57% (obs.) CMS 19.7 fb (8 TV) Obsrvd Expctd Expctd ± 1σ Expctd ± 2σ % CL Limit on Br(h µτ), % µτ µτ %.12 µτ, Jts %.15, 2 Jts % -.88 µτ, Jts % -.62 µτ, 1 Jt % -.78 µτ, 2 Jts % -.97 h µτ, 1 Jt % -.37 CMS 19.7 fb (8 TV) Bst Fit to Br(h µτ), %

46 Limit: Yukawa Coupling 46 Following LFV thory rfrnc: arxiv: LFV Lagrangian trms giv width: L V Y τµ τ L µ R h... Γ( h α β ) = m ( h 8π Y α β 2 + Y β α 2 ) Dfin branching ratio and solv for coupling: BR( h α β ) = Γ( h α β ) Y ( ) α β + Γ SM Γ h α β 2 + Y β α 2 = Γ SM m h 8π BR 1 BR ( )