TLEP,&a&long&term&vision&for&HEP&

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1 TLEP,&a&long&term&vision&for&HEP& 18&Lessons&learnt&from&LHC& 28&TLEP&(&&VHE&LHC)& 38&Physics&prospects&at&TLEP&(Higgs)& 48&Costs,&schedule,&immediate&plans&& &&&&for&a&design&study& Sergy& Colin&Bernet&(CERN)& 14/05/13& 1&

2 Discovery&of&a&Higgs&boson&at&LHC& σ&x&br&compapble&with& Standard&Model& Suggests&SM8like&couplings& HZ&and&HW&couplings&non&zero& good&news&for&an&e+e8&collider&& What&to&do&now?& Look&for&new&physics:& direct&searches&& precision&measurements& 14/05/13& 2&

3 Direct&searches&at&LHC:&no&susy&yet& Caveat:&non&exhausPve,&model&dependent& pair&producpon&possible&at&e + e 8 &collider&with& s=1&tev&only&if&m<500&gev& 14/05/13& 3&

4 Direct&searches&at&LHC:&no&exoPsm&yet& Caveat:&non&exhausPve,&model&dependent& pair&producpon&possible&at&e + e 8 &collider&with& s=1&tev&only&if&m<500&gev& 14/05/13& 4&

5 Direct&searches&at&LHC:&Future& ref.&in&j.&alcaraz &talk,&lhc&france&2013& Very% High% Energy% 100%TeV% new&parpcles&with&m&~&few&tev& HL&LHC&3000&_81&won t&help& SLHC&extends&the&range&to&several&TeV& What%about%higher% s?%% 14/05/13& 5&

6 Goal&of&an&e+e8&collider& Indirect&search&for&new& physics&through&precise& measurements&& involving&known&parpcles:& Higgs&boson& W&and&Z&boson& top&quark& requires&large&luminosity& Discover&&&study&& new&parpcles& requires&large&energy&& (1&TeV&is&not&enough)& 14/05/13& 6&

7 What&precision&on&Higgs&couplings?& Example&:&Precision&for&Higgs&couplings& Maximal&deviaPons&with&respect&to&SM&couplings,&as&a&funcPon&of&new&physics&scale& SUSY&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& &&&&&&& &for&tanβ&=&5&& H.&Baer,&M.&Peskin&et&al.& Composite&Higgs&& Top&partners&&& Other&models&may&give&up&to&5%&deviaPons&with&respect&to&the&Standard&Model& Maximal&deviaPons&for&the&new&physics&scale&sPll&allowed&by&LHC&results& J.D.&Wells&et&al.& Strongly&influences&the&strategy&for&Higgs&factory&projects& Need&at&least&a&per8cent&precision&on&couplings&for&a&5σ& observapon & And&sub8percent&precision&if&new&physics&is&at&the&(mulP8)TeV&scale& 14/05/13& 7&

8 The&soluPon&:&TLEP&+&VHE8LHC&& (Worst&case&soluPon&:&LEP3+HE8LHC)& F.&Zimmermann& (CERN&implementaPon)& TLEP%(80B100%km):!e + e B,%up%to% %%%%%% s%~350%gev% PSB% PS%(0.6%km)% SPS%(6.9%km)% LHC%(26.7%km)% HEBLHC,% s%=%33%tev%% LEP3%:%e + e B,%up%to%% %%%%% s%~%240%gev%% VHEBLHC%:%pp,%% % s%~%100%tev% TLEP%Physics%case%:%Precision%measurements%sensi?ve%to%mul?BTeV%New%Physics% TeraZ&( s~m Z ),&MegaW&( s~2m W ),&Higgs&Factory&( s~240&gev),&top&( s~350&gev)& Followed%by%VHEBLHC%:%Direct%search%for%New%Physics%in%the%10B100%TeV%range% s&~&100&tev&with&20t&magnets& Also&allows&the&HHH&coupling&to&be&measured&to&a&few&%& 14/05/13& 8&

9 80Bkm%tunnel%in%Geneva%area% % best %op?on% «Pre&Feasibility!Study!for!an!80&km!tunnel!at!CERN»! John!Osborne!and!Caroline!Waaijer,!! CERN,!ARUP!&!GADZ,!!submiJed!to!ESPG! Sergy& even%be`er% 100%km?% 14/05/13& 9/27&

10 Luminosity&at&e+e8&colliders& ElectroWeak Symmetry Breaking precision measurements require very high luminosity Luminosity"vs"Energy" Luminosity"(x1033)" 10000" TLEP% TLEP&:&Instantaneous&lumi&at&each&IP&(for&4&IP s)& Z,&1036& ILC% CLIC% WW,&2.1035& 1000" TLEP(4)% HZ,&5.1034& 100" (per&ip)& v&+&ww &H,&0.7&1033& 10" 1" 0" 500" 1000" 1500" 2000" 2500" Center"of"Mass"Energy"(GeV)" 3000" 3500" R.&Aleksan& s%(gev)% #%Bunches% 91% 2625% 240% 80% 350% 12% Circular&collider:& Can&use&more&than&one&detector&at&the&same&Pme&(here&4)& Luminosity&increases&when& s&decreases& because&saved&rf&power&is&used&to&collide&more&bunches&when&synchrotron& radiapon&decreases&(1/e4)&!&ulpmate&precision&measurements& Crossing&point&with&linear&colliders&~&400&GeV& 14/05/13& Luminosity&upgrade&( 3)&now&envisioned&at&ILC&:&luminosity&is&the&key&!& 10&

11 Luminosity&at&TLEP:&beam&size&&&Beamstralung& Luminosity&achieved&by&reducing&the&verPcal&β*& From&5&cm&(LEP2)&to&~&1&mm&(TLEP)& Note&:&0.3&mm&soon&to&be&realized&at&SuperKEKB& VerPcal&beam&size&σ y& ~&200&nm& Note&:&1&to&5&nm&for&Linear&Colliders& σ y &not&too&small&!&negligible&beamstrahlung&(bs)&for&physics& beam&energy&well&known&!&can&use&energy&conservapon& TLEPBH%(240)% TLEPBt%(250)% ILC%(250)% ILC%(350)% beam&energy&&[gev]& 120& 175& 125& 175& number&of&bs&γ&/collision&& 0.50& 0.51& 1.17& 1.24& mean&energy&lost&/&collision&[mev]& 42% 61% 1265% 2670% RMS&energy&lost&/&collision&[MeV]& 65% 95% 1338% 2760% F.&Zimmermann& 14/05/13& 11&

12 Luminosity&at&TLEP:&Top8up&injecPon& A.&Blondel& F.&Zimmermann& At&these&luminosiPes,& beam&lifepme&~&15& minutes&(bhabha)& SoluPon&:&double&ring& and&conpnuous&top8up& injecpon,&as&at&pep8ii& Note&:&Soon&to&be&realized& at&super8kekb,&beam& lifepme&~&5&minutes& TLEP& 14/05/13& First&logo&proposal& M.&Koratzinos& Contest&open!& 12&

13 Challenges&(a&subset)& Beamstrahlung& RadiaPng&e ± &pushed&outside&the&acceptance& Reduces&the&beam&lifePme&significantly&& Need&to&design&an&achromaPc&opPcs&at&the&IPs&& with&283%&momentum&acceptance& Efficient&RF&system& Need&12&GeV/turn&at&350&GeV& LEP2&had&850&m&at&7&MV/m& Very&high&power&:&up&to&200&kW&/&cavity&in&the&collider&ring& Power&couplers&similar&to&ESS& & &MHz&preferred& Small&verPcal&emivance&& M.&ZaneÇ& BNL&58cell&700&MHz&cavity& Can/should&further&reduce&beamstrahlung&by&minimizing&σ y /σ x& Aim&is&to&reach&0.1%&&(LEP2&had&2%,&SuperKEKB&plans&0.2%)& RF&Coupler& (ESS/SPL)& 14/05/13& 13&

14 TLEP&as&a&Higgs&factory&(1)& Physics&case&not&driven&by&the&fact&that&the&collider&is&linear&or&circular& Scan&of&HZ&threshold&:& & & s&=& &gev& & &Spin& Max&of&HZ&cross&secPon&:& & & & & & & & s&=& &gev& & & & & & & & &Mass,&σ HZ,&BRs,& &Width,&Decays& Just&below&v&threshold&:& & s&~& &gev&&&&&&&&&&&&&&&&width& Unpolarized%cross%sec?ons% P.Janot&and&G.&Ganis& Need%100 s%g B1% Z% &All%% Z% &νν%% 14/05/13& 14&

15 TLEP&as&a&Higgs&factory&(2)& ILCB250% LEP3B240% TLEPB240% Lumi%/%IP%/%5%years% 250%g 1$ 500%g 1$ 2.5%ab 1$ #%IP% 1% 4% 4% Lumi%/%5%years% 250%g 1$ 2%ab 1$ 10%ab 1$ Beam%Polariza?on% 80%,%30%% % % L 0.01 %(beamstrahlung) & 86%% 100%% 100%% Number%of%Higgs% 70,000% 400,000% 2,000,000% Upgradeable&to&& ILC&1TeV& &CLIC&&3&TeV&& HE8LHC&& 33&TeV& VHE8LHC& 100&TeV& Higgs&coupling&precisions&scale&like& e.g.,&for&g HZZ &:&&1.5%&&for&ILC&:&0.65%&for&LEP3&:&0.2%&for&TLEP& Five&years&of&TLEP&=&&758150&years&of&ILC&(at&240&GeV)& &Note&:&measure&total&Higgs&boson&width&Γ H& At&240&GeV&:&With& &σ HZ &&&(~&g 2 HZZ)&&and&σ HZ & &BR(H &ZZ)&&(~&g 4 HZZ/Γ H )& At&350&GeV&:&With& &σ WW H &&&(~&g 2 HWW)&&and&& 14/05/13& & & & & &σ HZ & &BR(H &WW)&&(~&g 2 HZZ g2 HWW /Γ H )& 15&

16 TLEP&as&a&Higgs&factory&(3)& A&slide&from&M.&Peskin&at&the&3rd&TLEP/LEP3& Worskshop&(108Jan82013)& 14/05/13& 16&

17 TLEP&as&a&Higgs&factory&(4)& Summary%of%the%ICFA%Higgs%Factory%Workshop%(FNAL,%Nov.%2012)% 10%&& <1%&& VHE&LHC& 14/05/13& 17&

18 TLEP&as&a&Higgs&factory&(5)& Need&sub8percent&precision&for&a&sensiPvity&to&mulP8TEV&New&Physics& Compare&(LHC),&HL8LHC,&ILC,&(LEP3),&TLEP&& &&Γ H &fixed& ±1% HF2012& Summary&:&TLEP&reaches&the&needed&accuracy& ILC&prospects&similar&to&HL8LHC s& Much&theorePcal&work&also&needed& J.&Ellis&et&al.& 14/05/13& 18&

19 TLEP&as&a&Higgs&factory&(6)& Need&sub8percent&precision&for&a&sensiPvity&to&mulP8TEV&New&Physics& Compare&(LHC),&HL8LHC,&ILC,&(LEP3),&TLEP&& &&Γ H &fixed& ±1% HF2012& Summary&:&TLEP&reaches&the&needed&accuracy& ILC&prospects&similar&to&HL8LHC s& Much&theorePcal&work&also&needed& J.&Ellis&et&al.& 14/05/13& 19&

20 Impact&of&TeraZ&and&MegaW&(1)&& Revisit&and&improve&the&LEP&precision&measurements& TLEP&can&do&the&enPre&LEP1&physics&programme&in&5&minutes&& LEP% ILC% LEP3% TLEP% Asymmetries,&Lineshape& s%~%m Z% MegaZ& GigaZ& ~TeraZ& TeraZ& Lumi&(cm 82 s 81 )& #Z&/&year& PolarizaPon& vs%lep1% s%~%2m W% Few&10 31& 2x10 7& no& 1% Few&10 33 & Few&10 9& easy& ~5B10% Few&10 35& Few&10 11& yes&(t,&l)& ~50% 10 36& 10 12& yes&(t,l)& ~100% WW&threshold& Lumi&(cm 82 s 81 )& Lumi&/&IP&/&year& Error%on%m W% Few&10 31& 10&pb 81& 220%MeV% Few&10 33& 50&_ 81& 7%MeV% 5x10 34& 500&_ 81& 0.7%MeV% 2.5x10 35& 2.5&ab 81& 0.4%MeV% s%~%240%gev % Lumi&(cm 82 s 81 )& Lumi&/&IP&/&5&years& Error%on%m W% 10 32& 500&pb 81& 33%MeV% 5x10 33& 250&_ 81& 3%MeV% 10 34& 500&_ 81& 1%MeV% 5x10 34& 2.5&ab 81& 0.4%MeV% Important&:&PolarizaPon&up&to&the&WW&threshold&with&TLEP& Very&precise&beam&energy&determinaPon&(10&keV)&:&unique&to&circular&colliders&& Measure&m Z,&Γ Z &to&<&0.1&mev,&m W &to&<&1&mev,&sin 2 θ W &to& & from&a LR & 14/05/13& 20&

21 Impact&of&TeraZ&and&MegaW&(2)&& Case&1&:&Only&SM&physics&in&EW&RadiaPve&CorrecPons& &&Stringent&SM&Closure&test& Set&stringent&limits&on&weakly&interacPng&new&physics&(m H,&m W &and&m top &known)& m W [GeV] Much&theorePcal&work&also&needed& March 2012 LHC excluded LEP2 and Tevatron LEP1 and SLD 68% CL M.&Grunewald& +& m W% m H &=&126&GeV& Circular% (LEP3)% 80.3 m H [GeV] m t [GeV] Linear% (ILC)% Case&2&:&Some&weakly&interacPng&new&physics&in&the&loops&?& &Will&cause&inconsistency&between&the&various&observables&& Become&sensiPve&to&mulP8TeV&WINP& LEP1&was&sensiPve&to&~&200&GeV&(m top )&&&&&&&&&&&&&&&&& Circular% (TLEP)%? 14/05/13& 21&

22 Preliminary&cost&esPmates& TLEP&cost:&7.1&Giga8CHF& Bare&tunnel& 3.1% (1)% Services&&&AddiPonal&infrastructure&(electricity,&cooling,& service&cavern,&rp,&venplapon,&access&roads& )& 14/05/13& 22& 1.0 (2) % RF&system&& 1.0% (3)% Cryo&system& 0.2% (4) % Vacuum&system&&&RP& 0.5 (5) % Magnet&system&for&collider&&&injector&ring& 0.8 (6) % Pre8injector&complex&&SPS&reinforcements& 0.5% Total% 7.1% Note:&detector&costs&not&included& &can&count&0.5&per&detector&(cms/atlas)& (1):&J.&Osborne,&Amrup&study& (2):&ExtrapolaPon&from&LEP& (3):&B.&Rimmer,&SRF&cost&per&GeV&or&& &&&&&&per&wav&for&cebaf&upgrade,&2010& (4):&F.&Haug,&4 th &TLEP&Days,&5&April&2013& (5):&K.&Oide&:&factor&2.5&higher&than&KEK,&& &&&&&&espmated&for&80&km&ring& (6):&24,000&magnets&for&collider&&&injector;&& &&&&&&&cost&per&magnet&30&kchf&(lhec);&& &&&&&&&10%&added;&no&cost&saving&from&mass&& &&&&&&&producpon&assumed& preliminary!!not!endorsed!by!anybody! About&4.5&kCHF&/&Higgs&boson&& (less&if&tunnel&+&magnets&+&cryo&are&in&vhe8lhc&price)& ILC&cost&(2012&re8evaluaPon)&:&7.8&Giga8$& Many&items&not&included:&& &site&construcpon,&infrastructure&engineering,&detectors,&coming&r&d,& & About&150&k$&/&Higgs&boson&

23 Possible&Pmescale& Design&study&:& &(Now!)& Next&European&Strategy&Workshop&:& & Decision&to&go&and&start&digging&:& & InstallaPon&while&HL8LHC&is&running&:&2023&8& & Run&:&2030&8& & 2010& 2015& 2020& 2025& 2030& 2035& 2040& LHC% HLBLHC% TLEP*% VHEBLHC*% R&D&+&construcPon& Design&&+&R&D&+&&construcPon& Design&+&R&D&+&construcPon& 14/05/13& 23&

24 Conclusion& TLEP&(&&VHE&LHC):& best&precision,&largest&discovery&reach,&cost&effecpve& The&design&study&is&starPng:& creapng&the&working&groups& seçng&up&collaborapve&tools& defining&the&soäware&framework& how&about&ilc/clic?& first&results&within&6&months&& To&get&more&informaPon,&manifest&your&interest,&& or&get&in&the&loop:& hvp://tlep.web.cern.ch/& 14/05/13& 24&

25 Backups& 14/05/13& 25&

26 14/05/13& 26&

27 Higgs%measurements%at% s%~%240%gev%(1)% " With%e + e % %ZH% %e + e X%and%µ + µ X%events% Measure%HZ%cross%section%in%a%model%independent%way% Find%m H %peak%from%the%leptons%and%e,p%conservation% Determine%spin%with%threeJpoint%threshold%scan% 10%K 1 /%point%suffice% Determine%σ HZ %and%g HZZ %coupling%at%240%gev% e + 3%%(1.5%)%precision%on%σ HZ %(g HZZ )with%250%k 1 $ e - Z* Good%tracker%needed,%but%details%mildly%depend%on%the%actual%performance% Plots%below%with%ILD@ILC%and%CMS@LEP3% [9,10,11] g HZZ% e + e ZH e + e X and µ + µ X H Z e +, µ +$ e, µ $ 15 e + e ZH µ + µ X e + e ZH µ + µ X cross section (fb) 10 5 J=0 J=1 J=2 Δp/p%~%0.2%% Δp/p%~%2%% s (GeV) Patrick Janot 14/05/13' [15,16] 27'

28 Higgs%measurements%at% s%~%240%gev%(2)% " With%ZH% %e + e X%and%µ + µ X%events%(cont d)% Measure%invisible%decay%branching%ratio%(X%=%nothing)% Precision%on%BR INV %~%1%%with%250%K 1$ Or%exclude%BR INV %>%~2%%at%95%%C.L.% " Measure%other%σ HZ BR(H %ff,vv)% With%exclusive%selections%of%Z%and%H%decays% Precision%of%1.5%%to%8%%with%250%K 1 for%the%copious%decays%(bb,%ww,%gg,%ττ,%cc)% Need%more%luminosity%for%rare%decays%(γγ, Zγ, µµ)% %Particle%flow,%b%and%c%tagging,%%lepton%and%photon%capabilities%needed%% ZH %qqbb,%250%k -1 ZH %llww lllνqq,%500%k J1 %%%%%%%%%%%%%%%%%%%ZH %Xγγ,%500%K J1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%ZH %Xµµ,%2%ab J1 % % Patrick Janot 14/05/13' [10,15,16] 28'

29 Higgs%measurements%at% s%~%240%gev%(3)% " Higgs%width%from%the%Hνν%final%state% From%σ WW H% %and%br(h %WW)% % σ WW H%% ~%g 2 HWW% BR(H %WW)%=%Γ H WW% /%Γ H %~%g 2 HWW%/%Γ H% Γ H %~%σ WW H% /%BR(H %WW)% Contribution%to%Hνν%from%HZ%~%40%pb%% Known%from%%ZH% %e + e X%and%µ + µ X%% Contribution%from%WW%fusion%~%6%pb% To%be%measured% Select%ννbb%events%from%ZH%and%WW%fusion% Needs%adequate%b%tagging%and%particle%flow% g HWW% Fit%the%missing%mass%distribution%for%N WW H bb% %σ HZ %x%br(h %bb)%known%to%~1.5%%or%better% σ WW H% %=%N WW H bb% /%BR(H %bb)% Precision%on%σ WW H%% ~%14%%with%250%K 1 $ Γ H %~%σ WW H% /%BR(H %WW),%measured%up%to%15%%precision%with%250%K J1% [17] Patrick Janot 14/05/13' 29'

30 Higgs%measurements%at% s%~%240%gev%(4)% " Higgs%width%from%the%ZZZ%final%state% Number%of%ZZZ%events%~%σ HZ% %BR(H %ZZ)% e $ Z $ Z %σ HZ %~%g 2 HZZ% BR(H ZZ)%=%Γ H ZZ /Γ H% ~%g 2 HZZ%/%Γ H% Number%of%ZZZ%events%~%g 4 HZZ%%/%Γ H% e +$ H Z Select%l + l %l + l X%events%(%~%background%and%H% WW%free)% Number%of%events%in%250%K 250%K J1% %200%K% %BR(H ZZ)% %BR(Z ll) 2 % %3 % %About%40%events,%of%which%~25%selected% Known%to%6%% from%l + l X%events% with%250%kj1% Z $ Hence%measure%the%total%width%Γ H %with%a%precision%of%21%% Reduced%to%12%%in%combination%with%WW%fusion%measurement%%% Could%be%further%reduced%with%other%Z%decays% (Need%full%simulation%and%WW/ZZ%simultaneous%fit)% Note%:%Precision%of%a%few%%%can%be%reached%on%Γ H %if%one%assumes%no%exotic%higgs%decays% Patrick Janot 14/05/13' 30'

31 Measurements%at% s%~%350%gev%(ilc/tlep)%[1]% " Luminosity%similar%for%ILC%and%TLEP% At%each%IP%:%350%K 1 over%5%years% With%possibly%4%detectors%at%TLEP% More%study%of%the%Hνν%final%state%with%H bb% Contribution%from%HZ%:%~%25%K% Contribution%from%WW H%:%~%25%K% ILC%( )% TLEP%( )% Improves%precision%on%Γ H %and%hww%coupling% Smaller%improvement%of%other%σ BR%measurements$ σ WW H% 12%% '4%% 2.2%% '1.5%% Γ H%% 10%% '5.5%% 1.8%% '1.3%% Patrick Janot 14/05/13' [10,17]' 31'

32 14/05/13& 32&