117■ 研究紹介

LHC での新物理探索 – Run 1 を終えて –ிʮ‫ ܖٻ‬እቩ‫܇‬ཋྸ‫׎‬ᨥᄂᆮǻȳǿȸ‫ࢀ ࠖݢ‬ʚ
Koji.Terashi@cern.ch
2014 ࠰ (࠯঺ 26 ࠰) 5 உ 12 ଐ

はじめに

1

ቩ‫܇‬ƷႆᙸưƋǔŵ2012 ࠰ 7 உƴȒȃǰǹቩ‫܇‬ǒƠƍ

√
LHC Ƹ 2009 ࠰ƴ᣻࣎ኒǨȍȫǮȸ s = 900 GeVưஜ఍ᆙ΁ƠᲦƦƷࢸǨȍȫǮȸǛ 7 TeV Ɣǒ 8 TeVૼቩ‫܇‬Ʒႆᙸƕ‫إ‬ԓƞǕƯˌஹᲦƦƷቩ‫܇‬Ʒဃ঺᫁ࡇᲦ

ƴɥƛƨŵƦƠƯᲦ2013 ࠰И᪽ƴ Run 1 ƕኳʕƢǔǇᡶǜƩኽௐᲦྵ‫נ‬ǇưƷƱƜǖǄǅ “೅แ೉‫׹‬ƷȒȃǰưƴᲦATLASᲦCMS ᬴ܱσƴƦǕƧǕኖ 25 fb−1 Ⴛ࢘ឋ᣽ᲦǹȔȳƳƲƷࣱឋƷย‫ܭ‬ƕᡶǈᲦ2013 ࠰ବƴȒȃǰǹቩ‫܇‬ƱᄩᛐƞǕǔƱƜǖǇưᡶǜƩŵƞǒƴย‫ܭ‬ƕǹቩ‫”܇‬ƱԠǜưǑƍǄƲ೅แ೉‫׹‬ƔǒƷƣǕƸᙸƑƯƷ pp ᘔᆳȇȸǿǛᔛᆢƠƨŵƜǕǒƷȇȸǿǛ̅ƬƯƍƳƍŵǇƞƴ೅แ೉‫׹‬ɢബᲛưƋǔŵƪƳǈƴ᭗Ǩȍ೅แ೉‫( ׹‬SM) ƴԃǇǕǔቩ‫܇‬Ƹ “ϐႆᙸ”ƞǕᲦƦƷȫǮȸȋȥȸǹưǋᲦ2012 ࠰ٰƷȒȃǰǹǒƠƖቩ‫܇‬ဃ঺ૺ᩿ᆢƸ೅แ೉‫׹‬Ʒ౨ᚰƕӧᏡƳǄƲƷችࡇưย‫ܭ‬ƞǕƸơǊƯƍǔŵW ± /Z ȜǽȳƱȈȃȗǯǩȸǯƷᲦƷႆᙸ (ƱƦƷᐻ‫ڠ‬Მ)ᲦƦƷࢸ 2013 ࠰ବƴƔƚƯȒȃ
ǰǹቩ‫܇‬ƱᄩᛐƞǕƯƍƘᢅᆉǛᡲ᠍Ʒ࢟ [6–15] ưƓҥɟဃ঺Ʊ‫ݣ‬ဃ঺ƴ‫ݣ‬Ƣǔྵ଺ໜưƷ ATLAS Ʒૺ᩿ᆢˡƑƠƯƍǔƷưᲦᐻԛƷƋǔ૾Ƹ଱᩼ƦƪǒǛӋༀƠย‫ܭ‬ƷኽௐƱ SM ʖेƱƷൔ᠋Ǜ‫ ׋‬1 ƴᅆƢŵƜƷǑ

ƯƍƨƩƖƨƍŵ

ƍɟᐲƕᅆƢᡫǓᲦ೅แ೉‫׹‬ᢅᆉƷች݅ย‫ܭ‬Ƹ᪯ᛦƴᡶஜᆜưƸᲦȒȃǰǹႆᙸƷഏƴஹǔᲹưƋǖƏ೅แ೉ǜưƍǔŵஇᡈưƸᲦW W ૝ʏƳƲƷʻǇưย‫ܭ‬ƞǕ‫׹‬ǛឭƑǔૼཋྸƱᲦƦǕƴ᧙ᡲƢǔசჷƷቩ‫܇‬ƴ‫ݣ‬ƢƯƍƳƔƬƨૼƠƍᢅᆉƷΫͅǋᙸƑƸơǊƯƍǔ [1]ŵǔ੕ኧƷྵཞǛ‫إ‬ԓƠƨƍŵཎƴឬ‫ݣ‬ᆅࣱྸᛯ (SUSY)ƜǕǒƷኽௐƸૼቩ‫܇‬੕ኧƴƸഎƔƢƜƱƷưƖƳƍ᩼ưʖेƞǕǔቩ‫܇‬Ʒ੕ኧƱᲦ˷йഏΨ೉‫׹‬ƳƲƷૼཋࠝƴ‫ٻ‬ʙƳǹȆȃȗưƋǓᲦᢅӊƷ᭗ǨȍȫǮȸȋȥȸྸƔǒ஖ࢳƞǕǔኳཞ७ȷȈȝȭǸȸƴბႸƠƯ੕ኧƠ

ǹ [2–5] ưǋࡇŷӕǓɥƛǒǕƯƍǔƷưᲦᛇኬƸƦƪƨኽௐƴ዁ƬƯ‫إ‬ԓƢǔŵǋƪǖǜƜǕǒƸ ATLASᲦǒǛӋༀƠƯƍƨƩƖƨƍŵ
   1  <= 8-5+    %% 7  &!  ;<   0,>

 4 "  83#8  +, -.

& &  4 "  83#8  +, -.

  -,!-.

 4 "  83#8  +, -.

  &


% 

 

 &
 4 "  83#8  +, -.

 7 4 "  )*&))  +, -.

 



 4 "  )*&))  +, -.

 



 4 "  83#8  +, -.

 & 4 "  )*&))  +, -.

 7  % 

 ! "  #$%&'$( ))*  +, -.

 

 ! "  #$%&'$( ))*  +, -.

/





" 
<  !.
<  &<.<;<  

9 '$   (0(123*)#22

7$9 3   (0(123*)#22

6 7 2 (0(123*)#22

7

   

+, -.
 



;<

+, -.



 5+!!,

7

" 
<  !.
<  &<.<

 4 "  )*&))  +, -.

 4 " 4&&))*&))  +, -.

 4 " 4&&))*&))  +, -.






























 4











6   (0(123*)#22(0(123*)#22

CMS ᬴ܱưࢽǒǕƨኽௐƷƝƘɟᢿưƋǓᲦƦƷǄƔƷኽௐƸƦǕƧǕƷ᬴ܱƷ web ȚȸǸ [16, 17] ƴǇƱǊǒǕƯƍǔŵƪƳǈƴƜǕǒƷኽௐǛЈƢƴƋƨƬƯᲦ
ཋྸᚐௌǋԃǊƯ ATLAS ଐஜǰȫȸȗƔǒƷ‫૾ٶ‬᩿ƴǘƨǔᝡྂƕƋƬƨƜƱǛ˄ᚡƠƯƓƖƨƍŵ

2

超対称性粒子の探索(0(123*)#22೅แ೉‫׹‬ǛឭƑǔཋྸ೉‫׹‬Ʒᇿ᪽Ƹ˴ƔᲹƱբǘǕǔ   

Ʊ˴Ǜ࣬ƍƭƘƩǖƏŵƦƷʴƷ‫ڤ‬ǈƱ̮ࣞ (Ჹ) ƴǑƬ   " : +, -.

‫ ׋‬1: W /Z ȜǽȳȷȈȃȗǯǩȸǯƷҥɟဃ঺Ʊ‫ݣ‬ဃ±঺Ʒૺ᩿ᆢย‫ܭ‬ƷኽௐŵӫͨƴᅆƢƷƸย‫͌ܭ‬ƱྸᛯʖेƱƷൔŵƦƠƯᲦǍƸǓ Run 1 ƷȏǤȩǤȈƱƍƑƹȒȃǰǹ

ƯሉƑƸ‫٭‬ǘǔƩǖƏƕᲦSUSY ƸʻưǋƦƷᇿ᪽ƷɟƭƱᎋƑƯǑƍƩǖƏŵମʻƍǖƍǖƱᜭᛯƞǕǔƜƱ
ǋ‫ٶ‬ƍྸᛯƷ “ᐯ໱ƞ”Ʒբ᫆ƸƻƱǇƣፗƍƯƓƍƯᲦSUSY ੕ኧƷྵཞƴƭƍƯஇૼƷኽௐǛԃǊƯˌɦưኰʼƠƨƍŵ
SUSY ੕ኧƸᲦR-ȑȪȆǣ̬‫܍‬ƴဌஹƢǔஇǋ᠉ƍឬ
miss Ǜ੕ኧ‫ݣ‬ᆅࣱቩ‫( ܇‬LSP) ƕ˺ǔෞ‫ڂ‬ǨȍȫǮȸ (ET)ƴဇƍǔƔƲƏƔư‫ٻ‬ƖƘʚƭƷኒወƴЎƚǔƜƱƕư

2
18
miss Ǜᙲ൭Ƣǔ‫ئ‬ӳᲦƖǔŵƞǒƴ LSP ƕ˺ǔ ET
SUSY 23 "34      ቩ‫܇‬Ʒឋ᣽᨞‫ޖ‬ǍߐْᢅᆉǛᎋॾƴλǕƳƕǒᲦȈȝȭǸȸƝƱƷ੕ኧȢȸȉǛᎋƑƯƍƘŵࢍƍႻʝ˺ဇưဃ঺ƞǕƨǹǯǩȸǯ/ǰȫǤȸȎ‫ݣ‬Ʒ੕ኧƸᲦƓǋƴ᭗ƍ್ᢃѣ᣽ (pT ) ǛਤƭᙐૠƷǸǧȃȈǍȬȗȈȳဃ঺Ǜ   !""    #$ %"($##$ '&

*
)*
) *
)&'
$+, -., /., 
 0 ) %1!%%miss ƴኵǈӳǘƤǔŵᇹɤɭˊǹǯǩȸǯ ǹȈȃȗȷET(ǹȜȈȠ) Ƹ೅แ೉‫׹‬ƷȈȃȗǍȜȈȠǯǩȸǯƴኽӳƠǍƢƍƨǊᲦb ǿǰƞǕƨǸǧȃȈǛᆢಊႎƴ෇ဇƢ(ǔŵȁȣȸǸȸȎȷȋȥȸȈȩȪȸȎ (W /Z ᲦȒȃǰ
±

(



ǹȜǽȳƷឬ‫ݣ‬ᆅȑȸȈȊȸƕ᣻ƶӳǘƞƬƨឋ᣽‫׍‬ஊSM ᩓࢊȜǽȳǋԃǊƯ) ƦƷߐْᢅᆉưЈƯƘǔȬȗ
missȈȳǛᙲ൭ƠᲦȐȃǯǰȩǦȳȉƱƷғКǛᘍƏŵETˌ‫ٳ‬Ʒ̮ӭǛཎࣉƱƢǔ੕ኧƱƠƯᲦ‫ٻ‬ឋ᣽ưᧈ‫ݤ‬ԡƳቩ‫܇‬ƕ˺ǔ̮ӭᲦƨƱƑƹǷȪǳȳ౨Ј֥ϋƷǨȍȫ



















 

()*+',())(- ./ % $ ' %& $ # " 2 344/. 5





 !

 !  !
 !

&3;/$ & ='67')&,@A&  & 

&3;/$ & =
. B4!-  8 

& 3;/$&=

'67')&,@A&  & 

&3;/ >= >(6'67')&,@A&  &

& .0 >= >(6'67')&,@A&  &&))&3;/$  & ? &=

'67')&,@A&  &     






ƸᲦ೉‫׹‬Ʒᛇኬƴ̔ǒƣ࠼ƍ m0 −m1/2 (‫ٻ‬ወɟǹǱȸȫ





   

miss Ǜ̅ƬƨǹǯǩȸǯஹƷ ET(q̃)/ǰȫǤȸȎ (g̃) ੕ኧ !
 !

ǫǹǱȸȉߐْᢅᆉƔǒஹǔᙐૠƷǸǧȃȈƱ LSP ဌ& 

第一世代スクォークとグルイーノ < ,7 3448 )*)1; 5 /; 4/308:7  % 8 & 8 9 $  % 6



2.1



  ).0- )*)1 





7)2



ӭƱƠƯᚇยƞǕǔŵ



 

ƳᢅᆉƸᲦ᫠ួƕෞ‫ڂ‬ᲦƋǔƍƸ৵Ǖ୺ƕƬƨǑƏƳ̮(a) 4 ǸǧȃȈʙᝋƔǒϐನ঺Ơƨ meﬀ Ўࠋ (ɦᢿƸȇȸǿƱȐȃǯǰȩǦȳȉʖेƱƷൔ)ŵ

ưƷ᫠ᘍ଺᧓ƳƲǛ̅Ƭƨ੕ኧƕƋƛǒǕǔŵᧈ‫ݤ‬ԡᒵǸȸȎƳƲ) ƕ᫠ួ౨Ј֥ϋưɶࣱቩ‫܇‬ƴߐْƢǔǑƏ  Ǯȸ੷‫( ڂ‬dE/dx) ǍǫȭȪȡȸǿȷȟȥȸǪȳ౨Ј֥ᩓቩ‫( ܇‬GMSB ǹǿǦǍឋ᣽ƕ጑ᡚƠƨ AMSB ȁȣȸ










!5 5  $(ཞ७) ǍǹȬȗȈȳƷႺ੗ȷ᧓੗੕ኧƴƸᲦ(ɶ᧓ཞ७Ʒ











 

ưƷǹȕǧȫȟǪȳƱǲȸǸȸȎƷឋ᣽) ᪸؏ǛǫȐȸЈஹǔ᩼ࠝƴȑȯȕȫƳ৖ඥưƋǔŵ‫ݣ‬ဃ঺ƞǕƨ q̃ q̃ Ღ
00
q̃g̃ Ღg̃g̃ ƕ q̃ → q χ̃1 Ǎ g̃ → q q̄ χ̃1 ߐْƠƨኽௐဃơǔ(b) m0 − m1/2 ࠯᩿ưƷ MSUGRA/CMSSM ೉‫( ׹‬tan β = 30Ღ
A0 = −2m0 Ღµ > 0) ƴ‫ݣ‬ƢǔСᨂ (95%̮᫂ࡇ)ŵ

miss Ʒዌ‫͌ݣ‬Ʒዮԧ Ღ miss
Ʊ ET
) ET /meﬀ ƳƲƷᢃѣ‫ܖ‬ႎǛဇƍƨǹǯǩȸǯȷǰȫǤȸȎ੕ኧƷኽௐŵ

miss Ღ
ǸǧȃȈૠƷࠀǛМဇƠᲦƔƭ ET
meﬀ (ǸǧȃȈ pT

miss‫ ׋‬2: ATLAS ưƷᙐૠǸǧȃȈ (ᲥȬȗȈȳ) Ქ ET‫٭‬ૠƴ‫ݣ‬ƢǔǫȃȈǛᙐૠဇॖƢǔƜƱưᲦɤƭƷᢅᆉǛ q̃/g̃/LSP Ʒ࠼ƍឋ᣽ࠀƴǘƨƬƯǫȐȸƢǔ [18]ŵ
‫ ׋‬2(a) ƴ 4 ǸǧȃȈǛᙲ൭Ơƨ‫ئ‬ӳƷȇȸǿƱʖेƞǕǔᏑ୎ʙᝋƷ (meﬀ ƴǫȃȈǛƔƚǔЭƷ)meﬀ ЎࠋǛᅆƢŵȇȸǿƱᏑ୎ʙᝋʖेƸ᬴ܱᛚࠀ (DATA/MC‫׋‬ƴᅆƞǕǔᑥ˄Ɩ࠘) Ʒር‫׊‬ϋưɟᐲƢǔƜƱƕЎƔǔŵǸǧȃȈૠƕ 2 Ɣǒ 6 ǇưƷӲ‫ئ‬ӳƴƭƍƯɟᐲφӳǛᛦǂᲦƦƜƔǒࢽǒǕǔ MSUGRA/CMSSM ೉‫׹‬ǁƷСᨂǛ m0 − m1/2 ࠯᩿ɥƴᅆƠƨƷƕ‫ ׋‬2(b) ưƋǔŵƜƷ‫׋‬ƴƸᲦஜᚐௌ (0-lepton, 2-6 jets) Ʒኽௐƴь
miss ưᢠКƞǕƨȇȸǿƴȬƑƯᲦᙐૠƷǸǧȃȈ+ETȗȈȳɟƭǛьƑƨ‫ئ‬ӳ [19]Ღ7 ஜˌɥƷǸǧȃȈǛᙲ൭Ơƨ‫ئ‬ӳ [20]Ღ3 ஜˌɥƷ b ǿǰƞǕƨǸǧȃȈǛᙲ൭Ơƨ‫ئ‬ӳ [21] ƳƲᲦƦƷǄƔƷ੕ኧኽௐǋӳǘƤƯᅆƠƯƋǔŵƢǂƯƷኽௐǛᎋॾƢǔƱᲦq̃(g̃) ƴ‫ݣ‬ƠƯ
ኖ 1.7(1.4) TeV ǇưూҲƞǕƯƍǔƜƱƕЎƔǔŵ

2.2

第三世代スクォークȒȃǰǹቩ‫܇‬Ʒឋ᣽ƴ‫ݣ‬Ƣǔȫȸȗ᣽‫܇‬ᙀദƸᲦ‫ٻ‬ƖƳื߷ኽӳǛਤƭ SM ȈȃȗǯǩȸǯƔǒƷ݃ɨƕஇǋ‫ٻ‬ƖƍŵǋƠឬ‫ݣ‬ᆅȈȃȗȑȸȈȊȸ (ǹȈȃȗᲦt̃) ƕᩓࢊǹǱȸȫᆉࡇƷឋ᣽ǛਤƬƯƍǕƹᲦƦƷ᣽‫܇‬ᙀദƷ‫ٻ‬ᢿЎƕႻൈƞǕǔŵƜƷ᠉ƍǹȈȃȗƷǷȊȪǪƸᲦൔ᠋ႎ “᣻ƍ”126 GeV ƱƍƏȒȃǰǹឋ᣽ƷᚇยƔǒ᧓੗ႎƴСᨂǛӖƚƯƸƍǔƕᲦ“ᐯ໱”Ƴ SUSY Ʒ௒ኵǈưƸǇƩǇƩႆᙸƷӧᏡࣱƕസƬƯƍǔŵ
ǹȈȃȗƷߐْಮࡸƸ೉‫׹‬ƴ̔‫܍‬ƢǔƕᲦ߼ (ӫ) ࠇƖȈȃȗǯǩȸǯƷឬ‫ݣ‬ᆅȑȸȈȊȸ t̃L (t̃R ) ƕฆӳƠƯưƖǔ‫׍‬ஊཞ७ƷƏƪᲦឋ᣽ƕ‫ݱ‬ƞƍ૾ (t̃1 ) Ǜǿȸ
0ǲȃȈƱƠƨ‫ئ‬ӳᲦt̃1 Ʊ χ̃1 Ʒឋ᣽ƔǒɼƳߐْȑǿȸȳƕൿǇǔŵt̃1 Ʒឋ᣽ƕ‫ٻ‬Ɩƍ‫ئ‬ӳ (mt̃1 − mχ̃0 > mt )1
0
ƸǄǅ t̃ → tχ̃1 ƱߐْƢǔƨǊᲦt̃ ‫ݣ‬ဃ঺Ʒኳཞ७Ƹ

3
19
miss ƴƳǔŵƜƷ‫ئ‬ӳᲦtt̄ + ETtt̄ → W + bW − b̄ Ʒ W ± ƷߐْƴࣖơƯᲦall-hadronic(W W → qq ′ qq ′ ) Ȣȸȉ [22]Ʊ semi-leptonic(W W → ℓνqq ′ ) Ȣȸȉ [23] ƷʚƭƷᚐ

Events / 50 GeVௌư‫ࣖݣ‬Ƣǔŵ105

ǔ di-leptonic SM tt̄ ȐȃǯǰȩǦȳȉǛᨊӊƢǔŵˌATLAS Preliminarys = 8 TeV,

104

SRtN2

103

(ƨƱƑƹ tt̄) ƕƱǋƴᚇยƞǕǔቩ‫܇‬ƱƞǕƳƍቩ‫܇‬
miss Ɣǒဃ঺ƴߐْƠƨ‫ئ‬ӳƴ, ӲߐْᢅᆉƷ MT Ʊ ETቩ‫܇‬Ʒឋ᣽Ǜਖ਼‫ܭ‬ưƖǔ MT 2 ඥ [24] Ǜ‫ݰ‬λƢǔŵƦƷ
ɥưᲦt → ℓνb ߐْƷ ℓν (= W ) Ǜෞ‫ڂ‬ቩ‫܇‬ƱᙸƳƢ
MT 2 Ʒ‫׹࢟٭‬ǛဇƍǔƜƱưᲦȬȗȈȳɟƭǛෞ‫ڂ‬ƢData 2012∫ L dt = 20.7 fb-1

miss Ўࠋƕ‫׋‬ɥƷኽௐࢽǒǕƨ ET
3(a) ưƋǔŵ

Standard Model (SM)Ӳ̮ӭ᪸؏ưʙᝋƷឬᢅƕᙸǒǕƳƍƜƱƔǒᲦmt̃1 −m~t = 500, mχ0 = 200 [GeV]tt

m~t = 600, mχ0 = 50 [GeV]

V+Jets, VV102mχ̃01 ࠯᩿ưƷСᨂƴ໲ƖႺƠƨኽௐƕ‫ ׋‬3(b) Ʒ “1L,
0t̃1 → tχ̃1 ”ƱᘙᚡƞǕƯƍǔ᪸؏ưƋǔŵƜƷ‫׋‬ưƸᲦ
0all-hadronic ȁȣȳȍȫ (0L, t̃1 → tχ̃1 ) ǍǄƔƷߐْ0ƴஇᢘ҄ƞǕƨᚐௌᲦƨƱƑƹᲦt̃1 → W bχ̃1 [25] Ǎ
0t̃1 → cχ̃1 [26] ƷኽௐǋǇƱǊƯᅆƞǕƯƍǔŵt̃1 ƕൔ

tt+V, single top, multijets

e+µ channel

10
1
10-1

᠋ႎ᠉ƍ‫ئ‬ӳ (mt̃1 − mχ̃0 < mt )Ღt̃1 ߐْư˺ǒǕǔቩ

Data/SM1‫܇‬ƕǽȕȈƴƳǔƨǊ SM tt̄ ȐȃǯǰȩǦȳȉƱƷғК2ƕᩊƠƍŵƜƷ᪸؏ǛᨊƚƹᲦmχ̃0 = 100 GeV ƴ‫ݣ‬Ơ
11

Ư mt̃1 < 660 GeV ᆉࡇǇưƷ᪸؏ƕూҲƞǕƯƍǔŵ

0
200 250 300 350 400 450 500 550 600 650
miss
ET [GeV]
miss Ўࠋ (ɦᢿƸȇȸǿƱȐȃǯ
(a) semi-leptonic ᚐௌưƷ ET
ǰȩǦȳȉʖेƱƷൔ)ŵ

1

400

1

ATLAS Preliminary

350

1

300

0L [1208.1447]

1L CONF-2013-037

1L [1208.2590]

2L [1403.4853]

2L [1209.4186]

2L [1403.4853]-

0L mono-jet/c-tag CONF-2013-068-

ឋ᣽ƴƠƯ 1.5 TeV ᆉࡇǇưƷᇹɟɭˊǹǯǩȸǯǍǰȫǤȸȎƕూҲƞǕƨཞඞưᲦ“᣻ƍ”SUSY ǹǱȸȫƷǷȊȪǪƕჇгƴ౨᚛ƞǕƯƍǔŵឋ᣽ƕૠ TeVૺ᩿ᆢƕ‫ݱ‬ƞƘƳǔƨǊᲦᩓࢊᢅᆉưƋǔȁȣȸǸȸȎǍȋȥȸȈȩȪȸȎ (ዮᆅƠƯǲȸǸȸȎƱԠƿ) ƷႺExpected limits੗ဃ঺੕ኧƕ᣻ᙲƴƳǔŵྸᛯƴ “ᐯ໱ƞ”Ǜ൭ǊǕƹᲦ

1

t +m
χ∼ 0

+

t

1

m~

m
<
t

1

m~

Ʒឬ‫ݣ‬ᆅȑȸȈȊȸ) Ƹ᠉ƘƳǔƜƱƕ஖ࢳƞǕǔᲦƱ

<m

b +

m

W

<m
1

t

Ȓȃǰǹቩ‫܇‬Ʒឋ᣽ƔǒȒȃǰǷȸȎ (ȒȃǰǹȜǽȳ

1

m

χ∼ 0

1

χ∼ 0

c +

m

チャージーノとニュートラリーノƔƦǕˌɥƷǹǯǩȸǯǍǰȫǤȸȎƸ࣏໱ႎƴဃ঺All limits at 95% CL

m~

200

0L CONF-2013-024

CDF 2.6 fb-1 [1203.4171]

Observed limits

250

Status: Moriond 2014

1

Lint = 20 - 21 fb-1 s=8 TeV Lint = 4.7 fb-1 s=7 TeV~
00L, t 1→ t ∼χ
1~
0
1L, t 1→ t ∼
χ
1
~
0
∼
2L, t 1→ t χ
1~
0
2L, t 1→ W b ∼χ
1~
0
0L mono-jet/c-tag,t 1→ c ∼χ1m∼χ0 [GeV]~~~∼0 / ~t → W b χ∼0 / ~t → c χ∼0
t1t1 production, t1→ t χ
1
1

2.3

150

ƍƏໜǋ੕ኧƢǔɥưƷǑƍѣೞƱƳǔŵ

c∼
χ1
0

Lint = 20.3 fb-1

ATLASȷCMS ᬴ܱƱǋƴᲦဃ঺ƞǕƨǲȸǸȸȎ±‫ݣ‬ƷߐْȑǿȸȳᲦƨƱƑƹ 1) ᠉ƍ ℓ̃/ν̃ ኺဌᲴχ̃1 →±000ℓ̃± ν(ν̃ℓ± ) → ℓν χ̃1 Ღ2) W Z ኺဌᲴχ̃1 → W ± χ̃1 Ღχ̃2 →

100
50

W b∼
χ1

Lint = 4.7 fb-1

0

Lint = 20 - 21 fb-1

Lint = 20.3 fb-1

0

200

300

400

500

600

700

m~t1 [GeV](b) mt̃1 − mχ̃0 ࠯᩿ưƷూҲ᪸؏ (95%̮᫂ࡇ)ŵ
1‫ ׋‬3: ATLAS ưƷǹǫȩȸȈȃȗǯǩȸǯ‫ݣ‬ဃ঺Ʊ t̃ →000tχ̃1 , W bχ̃1 , cχ̃1 ߐْƴ‫ݣ‬Ƣǔ੕ኧኽௐŵ0̊ƱƠƯᲦt̃1 Ʊ χ̃1 ƕൔ᠋ႎ᣻ƍ‫ئ‬ӳƴज़ࡇƷƋǔsemi-leptonic ȢȸȉưƷᚐௌኽௐ [23] ƷɟᢿǛ‫ ׋‬3(a)ƴᅆƢŵƜƜưƸᲦɟ̾Ʒ‫ܔ‬ᇌȬȗȈȳ (e Ɣ µ) Ʊ‫ݲ‬ƳƘƱǋ 4 ஜƷ pT > 80-25 GeV ƷǸǧȃȈ (Əƪஇmiss˯ɟƭƸ b ǿǰ) Ǜᢠ৸ƠƨɥưᲦET> 200 GeVᲦ
√
!
jet
miss
1/2
ET / HT > 13 GeV (HT ≡ jet |pT |)ᲦȬȗȈȳ
miss Ɣǒ൭Ǌƨ್૾Ӽឋ᣽
Ʊ ET
MT > 140 GeVᲦ3-jetƷឋ᣽ƕȈȃȗឋ᣽ƱჳႽƠƳƍƜƱ (130 < Mjjj <205 GeV) Ǜᙲ൭Ƣǔŵƞǒƴ, ‫ݣ‬ဃ঺ƞǕƨӷɟቩ‫܇‬

±
0
0
0
0
Z χ̃1 Ღ3) W h ኺဌᲴχ̃1 → W ± χ̃1 Ღχ̃2 → hχ̃1 ƱᲦȒȃǰǹƷ bb̄ ߐْƱ leptonic ߐْ (h → W W/ZZ → ℓℓ′ + X Ღ
h → τ τ ) ƴࣖơƯᲦƦǕƧǕƷኳཞ७ȷȈȝȭǸȸƴஇᢘ҄ƠƨᚐௌǛဇॖƠƯ੕ኧǛᘍƬƯƍǔŵ‫ ׋‬4(a) ƴᅆƢƷƸᲦɤƭƷȬȗȈȳǛᙲ൭Ơƨᚐௌ [27](W Z/W hኺဌưƸ W → ℓν Ღh → ℓℓ′ + X Ǜे‫ )ܭ‬ưƷ̮ӭ᪸؏ƷȇȸǿЎࠋưƋǔŵƜƷ੕ኧȢȸȉưƸᲦദᄩƴɤƭ
miss ᲦӷᆔီƷ‫ܔ‬ᇌȬȗȈȳ (e Ɣ µ) Ǜᙲ൭ƠƨɥưᲦET
missᇷӭƷȬȗȈȳ‫ݣ‬ƕ˺ǔឋ᣽ᲦஇࢸƷȬȗȈȳƱ ET

ƕ˺ǔ MT ǁƷǫȃȈƷኵǈӳǘƤǛ‫٭‬ƑǔƜƱưᲦ20̾Ʒ̮ӭ᪸؏ǛဇॖƢǔŵӲ̮ӭ᪸؏ưƷᚇยȇȸǿૠƱȐȃǯǰȩǦȳȉʖेǛᅆƠƨƷƕ‫ ׋‬4(a) ưƋǔŵஊॖƳʙᝋឬᢅƸᙸƑƳƍƷưᲦƦƷኽௐǛ mχ̃± (=1mχ̃02 ) − mχ̃01 ࠯᩿ɥưƷឋ᣽ూҲ᪸؏ƱƠƯᘙƠƨƷƕ‫ ׋‬4(b) ưƋǔŵƜƷ‫׋‬ưƸᲦȬȗȈȳǛʚƭԃǉʙᝋǛ

4

tt V + tZ
SR0 τaHiggs
VVV
WZ mediated (175,100)~lL mediated (688,63)

Data
Total SM
Reducible
WZ
ZZ

104
103

ATLAS

∫ L dt = 20.3 fb

s= 8 TeV-1

102

Tracks / GeV

Events20

105

s = 8TeV,

103

-1

Data
Total background
Interacting hadronp -mismeasured track
T
ElectronMuonmχ∼± = 200 GeV, τχ∼± = 0.2 nsmχ∼1± = 300 GeV, τχ∼1± = 0.2 nsmχ∼1± = 300 GeV, τχ∼1± = 1.0 ns
1

1

10

1

1

-1

10-1

10

10-2

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20

SR0τa bin(a) 3 ȬȗȈȳᚐௌƷӲ̮ӭ᪸؏ưƷᚇยȇȸǿૠƱȐȃǯǰȩǦ
ȳȉʖे (ɦᢿƸȇȸǿƱȐȃǯǰȩǦȳȉʖेƱƷൔ)ŵ

Data / Fit

2
1.5
1
0.5
0

∫Ldt = 20.3 fb

102

10

Data/SM

ATLAS

104

10-3
2.5
2
1.5
1
0.5
0

track p [GeV]
T

20

30 40

100

200 300
1000
Track p [GeV]T

20.3-20.7 fb-1, s=8 TeV

600

~
± 0
pp→∼
χ1∼
χ2, via lL/ ∼
ν,
~
+ −
pp→∼
χ1∼
χ1, via lL/ ∼
ν,
±
0
pp→∼
χ∼
χ , via ∼τ / ∼
ν,

1

τ

L

1 2

± 0
pp→∼
χ1∼
χ2, via ∼τL/ ∼
ν τ,
+ −
pp→∼
χ∼
χ , via ∼τ / ∼ν,500

Status: Moriond 2014

3l, arXiv:1402.7029

Expected limits

2e/ µ, arXiv:1403.5294
3l, arXiv:1402.7029

Observed limits

2τ, ATLAS-CONF-2013-028

2τ, ATLAS-CONF-2013-028
τ
L
1 1
± 0
pp→∼
χ1∼
χ2, via WZ, 2e/ µ+3l, arXiv:1403.5294± ∼0∼
pp→χ1 χ2, via Wh,
e/µbb, ATLAS-CONF-2013-093
± 0
pp→∼
χ∼
χ , via Wh,
3l, arXiv:1402.7029
1 2
+ −
pp→∼
χ1∼
χ1, via WW,

300

1

L

2

0

<
0

m ∼χ 1m ∼χ 2

200

0

=

+
0
m ∼χ 1mZ

102e/µ, arXiv:1403.5294

m ~l / ∼τ / ν∼ = 0.5(m ∼χ0 + m ∼χ0)Ltanβ = 5, µ > 01400(a) ෞ‫ڂ‬Ơƨ᫠ួͅᙀƷ್ᢃѣ᣽Ўࠋ (ɦᢿƸȇȸǿƱȐȃǯǰȩ
ǦȳȉʖेƱƷൔ)ŵ

τχ∼± [ns]m χ∼0 [GeV]ATLAS Preliminary=0m ∼χ 2+0m ∼χ 1mhm∼χ0 1=2m∼χ0 2

1m ∼χ 2

100

ATLAS
0
100

s = 8 TeV,

200

300

400

500

600

700

m ∼χ± (=m ∼χ0) [GeV]1

2

Expected 95% CL limit (±1 σexp)

10

ATLAS ( s = 7 TeV, 4.7 fb-1, EW prod.)
ALEPH (Phys. Lett. B533 223 (2002))∼±‘Stable’ χ1‫ ׋‬4: ATLAS ưƷǲȸǸȸȎ‫ݣ‬ဃ঺ƴ‫ݣ‬Ƣǔ੕ኧኽௐŵဇƍƨ੕ኧ [28](‫׋‬ɶưƸ 2e/µ Ʊᘙᚡ) Ʊ W h → ℓν +bb̄ƴཎ҄Ơƨ੕ኧ [29] Ʒኽௐ (e/µbb) ǋӳǘƤƯᅆƞǕƯƍǔŵℓ̃/ν̃ ኺဌƷߐْȑǿȸȳ (mℓ̃L = mν̃ = (mχ̃0 +2mχ̃01 )/2 Ǜˎ‫ )ܭ‬ưƸᲦኳཞ७ƷȬȗȈȳƕൔ᠋ႎ᭗ƍpT ǛਤƭƨǊ᬴ܱज़ࡇƸ᭗ƍƕᲦኽௐƸ mℓ̃L Ʊ mν̃ ƴ̔‫܍‬Ƣǔŵɟ૾ᲦW Z(W h) ኺဌưƸஇ‫ٻ‬ư 420(300) GeVᆉࡇǇưƠƔూҲƞǕƯƍƳƍ (σƴ mχ̃0 = 0 Ʒ‫ئ‬ӳ)ŵ
1ǲȸǸȸȎႺ੗ဃ঺Ʒႆᙸज़ࡇǛ᭗ǊǔƴƸᲦʻࢸƷȫȟȎǷȆǣƷ‫ࢍف‬ƕ᣻ᙲƴƳǔŵཎƴȒȃǰǷȸȎ LSPƷ‫ئ‬ӳᲦȓȸȎȷǦǣȸȎ LSP Ʒ‫ئ‬ӳƱൔǂƯဃ঺᫁ࡇƸɟఐǄƲ˯ƍӧᏡࣱƕƋǔŵǲȸǸȸȎႺ੗੕ኧƸᲦ

-1

Observed 95% CL limit (±1 σtheory)-1(b) mχ̃± − mχ̃0 ࠯᩿ưƷూҲ᪸؏ (95%̮᫂ࡇ)ŵ
1∫ L dt = 20.3 fb

1

100 150 200 250 300 350 400 450 500 550 600mχ∼± [GeV]1(b) mχ̃± − τχ̃± ࠯᩿ưƷూҲ᪸؏ (95%̮᫂ࡇ)ŵ
1

1‫ ׋‬5: ATLAS ưƷ AMSB ᒵᩓǦǣȸȎ‫ݣ‬ȷᒵᩓ-ɶࣱǦǣȸȎ‫ݣ‬ဃ঺ƴ‫ݣ‬Ƣǔ੕ኧኽௐŵƜƷቩ‫܇‬ƸɶࣱǦǣȸȎƱឋ᣽ƕ጑ᡚƠƯƓǓᲦǽȕȈƳᒵᩓȑǤǪȳǛ્ЈƠƯɶࣱǦǣȸȎƴߐْƢǔƱᎋƑǒǕǔŵʚƭƷǦǣȸȎƷχ‫׹‬ႎƳឋ᣽ࠀ ∆mχ̃1 =mχ̃± − mχ̃01 ƕኖ 160 MeV Ʊ‫ݱ‬ƞƍƨǊᲦൔ᠋ႎᧈƍ1‫ݤ‬ԡ (τχ̃± ∼ 0.1-1 ȊȎᅺᆉࡇ) ǛਤƪᲦƔƭᒵᩓȑǤ1Ǫȳƕϐನ঺᧤͌ˌɦƷᢃѣ᣽ƠƔਤƨƳƍƨǊᲦᒵᩓǦǣȸȎƷ᫠ួƕ౨Ј֥ϋư “ෞ‫”ڂ‬ƠƨǑƏƳ̮ӭǛʻࢸƷ LHC ưƷǨȍȫǮȸȷȫȟȎǷȆǣ‫ࢍف‬ƱƱǋ˺ǔŵƜƏƍƬƨ̮ӭǛဇƍƨ੕ኧƸᲦǦǣȸȎ LSP ǷƴႆᙸƷ஖ࢳƕƔƔǔ੕ኧưƋǔƱƍƑǔŵ

ȊȪǪưƷǲȸǸȸȎႺ੗ဃ঺ƴǋ᩼ࠝƴஊјưƋǔŵ

2.4

長寿命粒子

O(0.1) ȊȎᅺᆉࡇƷൔ᠋ႎჺƍ‫ݤ‬ԡǛਤƭᒵᩓǦǣȸȎƴ‫ݣ‬Ƣǔ౨ЈјྙǛɥƛǔƨǊᲦȔǯǻȫ౨Ј֥ϋƷȒȃȈऴ‫إ‬ǛǋƱƴ᫠ួƷϐನ঺ǛӧᏡƴƢǔཎКƳཎࣉႎƳᧈ‫ݤ‬ԡቩ‫܇‬Ʒ̮ӭƷɟƭƱƠƯᲦAMSB ೉ǢȫǴȪǺȠǛ᧏ႆƠᲦƦƷǢȫǴȪǺȠưϐನ঺ƞ‫[ ׹‬30] ư‫נ܍‬ƕʖेƞǕǔᒵᩓǦǣȸȎƕਫƛǒǕǔŵ

Ǖƨ᫠ួǛ̅ƬƯʙᝋᢠ৸ǛᘍƏ [31] (ᡫࠝưƸᲦȔǯ521

Ǉưᙲ൭Ơƨɥưϐನ঺ǛᘍƏ)ŵᚐௌưƸᲦ᫠ួǛ˦

107

Eventsǻȫ౨Ј֥ƱƦƷ‫ޖٳ‬ƴƋǔǷȪǳȳ౨Ј֥ƷȒȃȈ

4

10
10

102
10
1
10-1

ஜƷ initial-state radiation (ISR) ဌஹƷǸǧȃȈ (ʙᝋ10-2
Observed / ExpectedƷȈȪǬȸƱƠƯဇƍǔ) ǛਤƭƜƱǛᙲ൭ƢǔŵƦƷ
ɥưᲦᢠКƞǕƨ᫠ួƷ pT Ўࠋ (ƷᄩྙЎࠋ) Ǜ̮ӭƱȐȃǯǰȩǦȳȉƦǕƧǕƴ‫ݣ‬ƠƯ൭ǊᲦ̮ӭƱɼᙲ

11؏Ǜ‫ ׋‬5(b) ƴᅆƢŵƜƷኽௐǛ AMSB ೉‫׹‬ưƷྸᛯᚘምƱൔ᠋ƢǔƱᲦmχ̃± < 270 GeV(τχ̃± ∼ 0.2 ȊȎ
11ᅺᲦ∆mχ̃1 ∼ 160 MeV) Ʒ᪸؏ƕూҲƞǕƨƜƱƴႻ࢘

Ƣǔŵ

1.4
1.2
1
0.8
0.6

300 400

2000 3000

1000(a) ᩓ‫ݣ܇‬Ʒɧ‫٭‬ឋ᣽Ўࠋ (ɦᢿƸȇȸǿƱȐȃǯǰȩǦȳȉʖे
ƱƷൔ)ŵ

Data
Fit



QCD MCJES Uncertainty





W’ (1.9 TeV)

新物理の兆候を求めて

3

200

100

mee [GeV]##)''+"$ӭૠǁƷСᨂƔǒࢽǒǕƨ mχ̃± − τχ̃± ࠯᩿ưƷూҲ᪸

DibosonZ’(1500 GeV)
Z’(2500 GeV)3

missǮȸǛਤƨƣᲦƔƭ ET> 90 GeV ư‫ݲ‬ƳƘƱǋɟȉƷǈǛˎ‫ܭ‬Ơƨ‫ئ‬ӳƷȕǣȃȈኽௐǛ‫ ׋‬5(a) ƴᲦ̮tt
Dijet & W+Jets-1

10Ƣǔŵᒵᩓቩ‫܇‬Ʒ᫠ួƴ‫ݣ‬ƠƯƸᲦpT > 15 GeV ưԗ!
‫∆( ׊‬R = ∆η 2 + ∆φ2 < 0.4 Ʒር‫ )׊‬ƴ˷ЎƳǨȍȫࡇඥưȇȸǿƴȕǣȃȈƠƯᚸ̖ƢǔŵȐȃǯǰȩǦȳ

Data 2012
Z/ γ *∫sL=dt8 =TeV20 fb

5ᧈƠƨέƷ TRT ౨Ј֥ϋƴᙸǒǕǔȒȃȈƕ 5 ச฼ư±0ƋǔƜƱǛᙲ൭ƠƯᲦχ̃1 → χ̃1 ߐْƷͅᙀʙᝋǛᢠКƳȐȃǯǰȩǦȳȉƷ݃ɨǛȑȩȡȸǿƱƠƯஇ‫ݹٻ‬ATLAS Preliminary
Z’ → ee Search

106

A / C (3.6 TeV)




SUSY ƴᨂǒƳƍŵƋǒƨƳǰȭȸȐȫ‫ݣ‬ᆅࣱǛ‫ݰ‬λƠƯ೅แ೉‫׹‬ƷᨂမǛឭƑǔᚾǈƸᲦʻǇưƨƘƞǜᘍǘǕƯƖƨŵƦƏƍƬƨಮŷƳਘࢌ೉‫׹‬ư‫ݰ‬λƞǕǔ‫ݣ‬ᆅࣱ (ƷᄊǕ) ƴ˄᨟Ƣǔૼቩ‫܇‬ǛᲦ̾ŷƷ೉‫׹‬Ʒᛇኬƴ

!.!&.!.!

೅แ೉‫׹‬ǛឭƑǔૼƠƍཋྸƷӧᏡࣱƸᲦǋƪǖǜ,$(&)&*!,/-$ %"
00  0  0 '')'' $ &#$$.-



























̔ǒƣᲦኳཞ७ȷȈȝȭǸȸșȸǹư࠼Ƙ੕ኧƢǔƜƱ

&'$.!--$ƕஓǇƠƍŵATLASȷCMS ɲ᬴ܱƱǋᲦSUSY ˌ‫ٳ‬Ʒ(b) ǸǧȃȈ‫ݣ‬Ʒɧ‫٭‬ឋ᣽Ўࠋ (ɦᢿƸȇȸǿƷወᚘᛚࠀƴ‫ݣ‬ƢǔȇȸǿƱȕǣȃȈኽௐƷࠀƷஊॖࡇ)ŵ

ૼཋྸ੕ኧƸƜƷ૾ᤆƷǋƱᡶǊǒǕƯƍǔŵ

‫ ׋‬6: ȕǧȫȟǪȳ‫ݣ‬ƴʚ˳ߐْƢǔσᯚཞ७Ʒ੕ኧ

3.1

共鳴状態の探索3.1.1

レプトン対生成+ −Ǎe e+ − ƳƲƷӷᆔȬȗȈȳ‫ݣ‬Ʒɧ‫٭‬ឋ᣽

µ µ

ኽௐŵ
ɥƱ౨ЈјྙƷዜਤǛ‫׋‬ǔŵȐȃǯǰȩǦȳȉƸȉȬȫ

(mℓℓ )

ЎࠋƴྵǕǔσᯚཞ७Ʒ੕ኧ [32] ƸᲦ᣻ƍǲȸǸȜǽȳǍപ୺˷йഏΨ೉‫( ׹‬RandallᲦSundrumᲦᡫᆅ RS [33])ƴྵǕǔ Kaluza-Klein ǰȩȓȈȳ (GKK ) ƳƲƴ‫ݣ‬ƠƯȤȳဃ঺Ʒ 2 ȬȗȈȳʙᝋ q q̄ → Z/γ ∗ → ℓ+ ℓ− ƕɼưᲦmℓℓ = 1 TeV ưμ˳Ʒኖ 80-90%ǛҩǊǔŵƜƷȐȃǯ
ǰȩǦȳȉƸᲦ1) NLO ȀǤǢǰȩȠǇưԃǊƨʙᝋǛPowheg ưဃ঺ƠᲦNNLO અѣ QCD ᚘም (mℓℓ ̔‫܍‬
Ʒ NLO Electroweak ᙀദǛԃǉ) ư൭Ǌƨဃ঺ૺ᩿ᆢ

᩼ࠝƴज़ࡇƕ᭗ƍŵZ Ȝǽȳឋ᣽ƔǒɥƷ᪸؏ƴǋƠƴᙹ఍҄ƢǔᲦ2) ƦǕˌ‫ٳ‬ƷȐȃǯǰȩǦȳȉǋԃǊȔȸǯƕྵǕǕƹᲦƦǕƸૼƠƍཋྸƷଢᄩƳΫͅƴƯ 80 < mℓℓ < 100 GeV ᪸؏ưȇȸǿƴᙹ఍҄ƢǔᲦƜƳǔŵ੕ኧƦƷǋƷƸǷȳȗȫưᲦ‫ܔ‬ᇌƠƨʚƭƷӷƱưᚸ̖Ƣǔŵ‫ ׋‬6(a) ƴȇȸǿƷ mee ЎࠋƱȐȃǯǰ

eᆔȬȗȈȳ (ET> 40-30 GeVᲦpµT > 25 GeV) Ǜᙲ൭ȩǦȳȉʖेǛᅆƢŵșȳȁȞȸǯƱƠƯᲦSM Z ȜǽƠᲦƦƷɧ‫٭‬ឋ᣽ЎࠋƴஊॖƳʙᝋƷឬᢅƕƋǔƔƲ

ȳƱӷơኽӳǛˎ‫ܭ‬Ƣǔ SSM ೉‫׹‬ưʖेƞǕǔ Z ′ ȜƏƔǛ੕ǔƩƚưƋǔŵȟȥȸǪȳƷᢃѣ᣽ЎᚐᏡƸ᭗ǽȳ (ߐْࠢƱឋ᣽Ʒൔ Γ/m ∼ 3.1%) Ǜൔ᠋ƷƨǊ‫׋‬ƍ pT ưफƘƳǔƨǊ (1 TeV ư ∆pT /pT ∼ 10–25%)Ღ
ȟȥȸǪȳ౨Ј֥ϋƷȒȃȈவˑǛƖƭƘƠƨ‫ئ‬ӳƱዼǊƨ‫ئ‬ӳƷȟȥȸǪȳᢠ৸Ǜ‫ݰ‬λƠᲦmµµ ЎᚐᏡƷӼƴ᠍ƤƯƍǔŵȟȥȸǪȳ‫ݣ‬Ʒ‫ئ‬ӳǋԃǊƯᲦȇȸǿƴஊॖƳʙᝋƷឬᢅƸᙸǒǕƳƍŵ

6ూҲ᪸؏ [TeV]RS KK ǰȩȓȈȳ
SSM W ′ Ȝǽȳ
SSM Z ′ Ȝǽȳ
Excited ǯǩȸǯ

[1.20, 1.58]

Axigluon/Coloron
Color Octet ǹǫȩȸ

[1.20, 3.60], [3.90, 4.08][1.20, 2.79]

3.1.2[1.20, 2.29][1.20, 1.68][1.20, 3.50]

ジェット対生成pp ᘔᆳƷ᣻࣎ኒǨȍȫǮȸƕɥƕǔƱᲦ᭗ƍǨȍȫǮȸǛਤƭȑȸȈȳƷᘔᆳ᫁ࡇǋ᫠៫ႎƴɥƕǔŵƜƷऍऔǛࢍƘӖƚǔƷƸᲦqg, gg → X ƳƲƷࢍƍႻʝ˺ဇưဃ঺ƞǕǔૼቩ‫܇‬ưƋǓᲦƦƷቩ‫܇‬Ǜ 2 ǸǧȃȈ(X → q q̄, qg, gg) Ʒσᯚཞ७ƱƠƯ੕ƢƷƸ೉‫׹‬Ʒᛇኬƴ̔‫܍‬ƠƳƍŵᚐௌƸ᭗ƍ pT ƷǸǧȃȈʚஜǛ౨Ј֥Ʒɶ‫ځ‬᪸؏ƴᙲ൭ƠᲦƦƷɧ‫٭‬ឋ᣽ (mjj ) ЎࠋƴྵǕǔȔȸǯǛ੕ƢŵCMS ƕ 2012 ࠰ƷȕȫȇȸǿǛဇƍƯᘍƬƨ੕ኧ [34] ưƸᲦҞࢲ R = 0.5 ưϐನ঺ƞǕƨǸǧȃȈƴƦƷᡈͯ (ុᩉư R < 1.1 ˌϋ) ƷǰȫȸǪȳ્‫ݧ‬ƴǑǔǨȍȫǮȸǛьƑƨ wide ǸǧȃȈʚஜǛ̅ƬƯ mjj Ǜϐನ঺ƢǔŵƦƷʚஜƷ wide ǸǧȃȈƕ
౨Ј֥ɶ‫|( ځ‬η| < 2.5) Ɣƭ η ૾ӼƴᩉǕƣ (|∆η| < 1.3)
ƴဃ঺ƞǕƯƍǔƜƱǛᙲ൭ƠᲦt ȁȣȳȍȫǰȫȸǪȳʩ੭ᢅᆉƔǒƷ QCD ʙᝋǛถǒƢŵȐȃǯǰȩǦȳ
ȉƷ mjj ЎࠋƸᲦᨗ‫܇‬ƷȑȸȈȳЎࠋ᧙ૠƴЩƬƨኺ᬴ࡸưȇȸǿƴȕǣȃȈƠƯ൭ǊᲦ཰ƍឋ᣽᪸؏ƴஊॖƳʙᝋƷឬᢅƋǔƍƸഎ੷ƕƳƍƔൿ‫ܭ‬Ƣǔŵ‫ ׋‬6(b) ƴȇȸǿƷ mjj ЎࠋƱȕǣȃȈƷኽௐᲦȇȸǿƷȕǣȃȈ
ƔǒƷƣǕǛᅆƢŵஊॖƳƣǕƸᙸǒǕƳƍƜƱƔǒᲦƍƘƭƔƷૼቩ‫܇‬೉‫׹‬ƴ‫ݣ‬ƠƯСᨂǛ˄ƚƨኽௐƕᘙ 1ưƋǔŵATLAS ưǋӷಮƷ੕ኧ [35] ƸዒዓႎƴᘍǘǕƯƍǔƕᲦസࣞƳƕǒஊॖƳ̮ӭƸƜƪǒưǋᙸƑƯƍ
Ƴƍŵ

3.1.3

トップ対生成᣻ƍǯǩȸǯᲦཎƴȈȃȗǯǩȸǯ‫( ݣ‬tt̄) ƴߐْƢǔૼቩ‫܇‬ƸƞǇƟǇƳਘࢌ೉‫׹‬ư‫נ܍‬ƕʖᚕƞǕǔŵૼቩ‫܇‬Ʒឋ᣽ƕ‫ٻ‬ƖƍǄƲȈȃȗǯǩȸǯƸ᭗ƍ pT ǛਤƪᲦƦƷߐْቩ‫ ܇‬W b → (ℓν/q q̄ ′ )b Ƹ཰ƍ η-φ ᪸؏ƴcollimate ƢǔŵƦƷǑƏƳ “ȖȸǹȈ”ƠƯƍǔȈȃȗ
ǯǩȸǯƷӷ‫ܭ‬ƴƸʻǇưƱƸᢌƏ৖ඥƕᙲ൭ƞǕǔŵtt̄ ƕ semi-leptonic ƴߐْƢǔ‫ئ‬ӳᲦཎƴ leptonic Ȉȃȗ (tlep ) ƔǒƷȬȗȈȳƕᡈͯƷ b ǸǧȃȈƔǒ‫ܔ‬ᇌƠᲦƔƭ collimate Ơƨ hadronic Ȉȃȗ (thad ) Ʒ̮ӭɶƴ

108 ATLAS Preliminary-1
107
L dt = 14.2 fb
106

5 × Z’ (1.5 TeV)
5 × g (2.0 TeV)

Data

∫

tt
Multi-jets

KK

W+jetsOther Backgrounds

105

s = 8 TeV

104
3

10

102
10

Data/Bkg೉‫׹‬/ቩ‫܇‬

1

1.5 0
1
0.5
0

0.5

1

1.5

2

2.5

0.5

1

1.5

2

2.5

3

3.5

3
3.5
mreco
[TeV]
tt

(a) Ȉȃȗ‫ݣ‬Ʒɧ‫٭‬ឋ᣽Ўࠋ (ɦᢿƸȇȸǿƱȐȃǯǰȩǦȳȉʖेƱƷൔ)ŵ

σZ’ × BR(Z’→ tt) [pb]

ᘙ 1: 95%̮᫂ࡇưూҲƞǕƨឋ᣽᪸؏ (ᚇย͌)ŵ

Events / TeV

22

V = 8 TeV103

2EV&/XSSHUOLPLW([S&/XSSHUOLPLW([S σXQFHUWDLQW\([S σXQFHUWDLQW\/HSWRSKRELF=· /2[∫ / GW = 14.3 fb

-1

102

ATLAS Preliminary

10
1
10-1
10-2
0.5

1

1.5

2

2.5

3

Z’ mass [TeV](b) Z ′ → tt̄ Ʒဃ঺ૺ᩿ᆢƴ‫ݣ‬ƢǔСᨂ (95%̮᫂ࡇ)ŵ

‫ ׋‬7: Ȉȃȗ‫ݣ‬ƴʚ˳ߐْƢǔσᯚཞ७Ʒ੕ኧŵ̮ӭƷ೉‫׹‬ƱƠƯᲦZ ′ → tt̄(Γ/m ∼ 3%) Ʊ KK ǰȫȸǪȳ

gKK → tt̄(Γ/m ∼ 15%) Ǜे‫ܭ‬ƠƯƍǔŵ

q q̄ ′ Ʊ b ǯǩȸǯဌஹƷǸǧȃȈǛӷ‫ܭ‬ưƖǔƔƲƏƔ
ƕ᣻ᙲƴƳǔŵATLAS ưƸᲦȬȗȈȳƷԗ‫׊‬ƴȬȗȈȳƷ pT ƱƱǋƴኬƘƳǔ η-φ ᪸؏Ǜे‫ܭ‬ƠᲦƦƷ᪸؏ϋƴǨȍȫǮȸƕЎࠋƠƯƍƳƍƜƱᲦҞࢲ R = 1.0 Ʒ“fat”ǸǧȃȈƱƠƯϐನ঺Ơƨ thad ƔǒᲦgrooming [36]ƱԠƿ৖ඥǛ̅ƬƯ q q̄ ′ b ƷǳǢƩƚǛӕǓЈƢᲦƱƍƏ૾ඥưƜƷբ᫆ƴ‫ࣖݣ‬Ƣǔŵ‫ ׋‬7(a) ƴᅆƢƷƸᲦsemi-leptonic ȢȸȉưƷ tt̄ σᯚ੕ኧ [37] ƷኽௐࢽǒǕƨ mtt̄ ЎࠋưƋǔŵƜƷᚐௌư
miss ǛਤƸᲦpT > 25 GeV ƷȬȗȈȳ (ℓ = e, µ) Ʊ ETƭʙᝋǛᲦR = 0.4 Ʒ “narrow”ǸǧȃȈǛ‫ݲ‬ƳƘƱǋɤஜਤƭǿǤȗ (ȈȃȗƕȖȸǹȈƠƯƍƳƍ‫ئ‬ӳ) Ʊ fatǸǧȃȈ (pT > 300 GeV) Ʊ narrow ǸǧȃȈǛ‫ݲ‬ƳƘƱǋɟஜƣƭਤƭǿǤȗ (ȖȸǹȈƠƯƍǔ‫ئ‬ӳ) ƴЎƚǔŵtt̄ ǷǹȆȠƷϐನ঺ƸᲦЭᎍưƸǷȟȥȬȸǷȧȳƔǒ൭Ǌƨ mWhad Ǎ mthad Ღmtlep Ʒ࠯‫͌ר‬Ʊ೅แ͞ࠀǛ̅ƬƯᚘምƠƨ χ2 ͌ƕஇ‫ݱ‬ƴƳǔǑƏƳኵǈӳǘƤ723

Ǳȸȫ (2 ǵȖǸǧȃȈನᡯǛਤƭƱ‫ٻ‬ƖƘƳǔǑƏƳ᣽)√ƕ d12 > 40 GeV ƷவˑǛᛢƠƯ thad ǸǧȃȈǛӷ‫ܭ‬
missƢǔŵࢽǒǕƨ thad Ǜ ℓ + ET
+ narrow ǸǧȃȈƔǒ

ϐನ঺ƞǕǔ tlep ƱኵǈӳǘƢƜƱư mtt̄ ƕࢽǒǕǔŵdN/dEmiss[Events/GeV]TǛӕǔŵȈȃȗƕȖȸǹȈƠƯƍǔ‫ئ‬ӳƸᲦgrooming ࢸƷ q q̄ ′ b ǳǢƴ‫ݣ‬ƠƯឋ᣽ƕ > 100 GeVᲦkt splitting ǹ

10

10-1

Data / BGዡੑƚƷ࠘) Ʒር‫׊‬ưǑƘɟᐲƠƯƓǓᲦƦƷኽௐƔǒ

Mono-X 探索‫ٻ‬ƖƳ˷йഏΨ೉‫( ׹‬Arkani-HamedᲦDimopoulosᲦ

q/ g

G

1.5
1
0.5

200

3.2

s = 8 TeV

101Ʒឋ᣽СᨂƕࢽǒǕǔŵ(‫ ׋‬7(b))ŵ

∫-1

Ldt=10.5fb

2ȇȸǿƱȐȃǯǰȩǦȳȉƸƜƜưǋኒወᛚࠀ (‫׋‬ɶƷȈȃȗǫȩȸ೉‫׹‬Ʒ Z ′ ቩ‫܇‬ƴ‫ݣ‬ƠƯᲦmZ ′ < 1.8 TeV

data 2012
Total BG
Z ( → ν ν ) + jets
W ( → l ν ) + jets
Z ( → ll ) + jets
Dibosons
tt + single top
ADD n=2, MD=3 TeV (x5)D5 M=80GeV, M*=670GeV (x5)
~
G +~
q/~
g, M~ ~=1TeV, M~=10-4eV (x5)

ATLAS Preliminary

103

300

400

500

600

700

800

900 1000 1100 1200
miss
ET [GeV]

miss Ўࠋ (ɦᢿƸ(a) pT > 220 GeV ƷǸǧȃȈǛᙲ൭ƠƨࢸƷ ET
ȇȸǿƱȐȃǯǰȩǦȳȉʖेƱƷൔ)ŵ

DvaliᲦᡫᆅ ADD [38]) ư‫נ܍‬ƕ஖ࢳƞǕǔǰȩȓȈȳ
ƕ pp ᘔᆳưႺ੗ဃ঺ƞǕƨ‫ئ‬ӳᲦǸǧȃȈƱӒ‫૾ݣ‬Ӽ
miss ƱƠƯᚇยƞǕǔŵƜƏƠƨ
ƴЈǔ ET“mono-ǸǧȃȈ”̮ӭƸ ADD ˷йഏΨƩƚưƳƘᲦଢ଼᱅ཋឋͅᙀưƋǔ WIMP(χ) ƕ LHC ưဃ঺ӧᏡƳឋ᣽᪸؏ƴƋǔ‫ئ‬ӳᲦƦƷ‫ݣ‬ဃ঺ pp → χχ̄ + X ̮ӭƴ‫ݣ‬ƠƯǋज़ࡇǛਤƭŵƜƷƱƖᲦX Ǜ ISR ဌஹƷǸǧȃȈǛ̅ƬƯǿǰƢ

Ǖƹ mono-ǸǧȃȈ̮ӭƱƳǔŵ᣻࣎ኒǨȍȫǮȸ 8 TeV ưƷ ATLAS Ʒ mono-Ǹǧȃ
missȈ੕ኧ [39] ƸᲦpjet>
T > 120 GeV ƷǸǧȃȈɟஜƱ ET
miss ƴ
120 GeV ǛਤƭȇȸǿƔǒǹǿȸȈƠƯᲦpjet
T Ʊ ET‫ݣ‬ƠƯׄെ᨞ƷǫȃȈ (120-500 GeV) Ǜᙲ൭Ƣǔŵ̮ӭʙᝋưƸ ISR/FSR Ɣǒ˷ЎƳǰȫȸǪȳǸǧȃȈƕ˺ǒǕǔӧᏡࣱƕƋǔƨǊᲦpT > 30 GeV ƷǸǧȃȈǛஇ‫ٻ‬ʚஜǇưᚩܾƢǔŵW ± → ℓ± ν+ǸǧȃȈƳƲƷ݃ɨǛถǒƢƨǊᲦȇȸǿɶƴϐನ঺ƞǕƨȬȗȈȳƕ‫נ܍‬ƠƳƍƜƱǛᙲ൭ƠᲦƔƭǸǧȃȈƴ‫ݣ‬ƠƯ tight Ƴ quality ǫȃȈǛƔƚǔƜƱưǫȭȪȡȸǿȎǤǺǍ LHC ƷȓȸȠȏȭȸᲦ‫ܬܢ‬ዴឪเƷȐȃǯǰȩǦȳȉǛᓳƱƢŵ‫ ׋‬8(a)missƴᅆƢƷƸᲦpjet> 220 GeV Ǜᙲ൭
T > 220 GeVᲦETmiss ЎࠋưƋǔŵȐȃǯǰȩǦȳȉƸ
ƠƨࢸƷ ETZ →ν ν̄+ǸǧȃȈƕμ˳Ʒኖ 60-70%ᲦW ± → τ ± ν+ǸǧȃȈmissƕ 10-20%ǛҩǊᲦmulti-jet ȐȃǯǰȩǦȳȉƸ ETƕ ∼ 200 GeV ǛឭƑǔ᪸؏ưƸ໯ᙻưƖǔǄƲ‫ݱ‬ƞƍŵZ → ν ν̄+ǸǧȃȈƳƲƷᩓࢊᢅᆉƔǒƷ݃ɨƸᲦȬȗȈȳǛԃǉʙᝋǛ̅ƬƯȇȸǿƱ MC ʖेƷൔ (ǹǱȸȫ‫׆‬‫ )܇‬Ǜ൭ǊᲦƦǕǛ̮ӭ᪸؏ư஖ࢳƞǕǔ MC ƷʙᝋૠƴੑƚӳǘƤǔƜƱưᚸ̖ƢǔŵȇȸǿƴஊॖƳʙᝋƷឬᢅƸᙸǒǕƣᲦƦƷኽௐƔǒ 4 + n ഏΨ (n = 2, 3, 4, 5, 6)ưƷȗȩȳǯǹǱȸȫ MD ƴ‫ݣ‬ƠƯᲦleading-order ư

MD > 3.88, 3.16, 2.84, 2.65, 2.58 TeV Ʒɦᨂ͌ƕࢽǒǕƨŵCMS ƷӷಮƷᚐௌ [40] ưƸᲦ8 TeVᲦ19.5 fb−1 ƷȇȸǿǛ̅ƬƯ MD > 5.10, 3.94, 3.44, 3.10, 2.94 TeV ƕࢽǒǕƯƍǔŵ

(b) WIMP ଢ଼᱅ཋឋƷဃ঺ૺ᩿ᆢƴ‫ݣ‬ƢǔСᨂ (90%̮᫂ࡇ)ŵׄᚌƱɤᚌƷໜƸ 8 TeV mono-W /Z ੕ኧ [41] ƷኽௐŵD5(u=d):obs
ƷƢƙɦ (߼) Ʊ D9:obs ƷƢƙɥ (ӫ) ƴƋǔዴƕ 7 TeV monoǸǧȃȈ੕ኧ [42] Ʒኽௐŵ‫ ׋‬8: Mono-X ੕ኧƷኽௐŵ(b) ưƸ mono-ǸǧȃȈƱ

mono-W /Z ƷኽௐǛଢ଼᱅ཋឋƷႺ੗੕ኧ᬴ܱƱൔ᠋ƠƯƍǔŵMono-ǸǧȃȈ੕ኧƷኽௐǛ WIMP ଢ଼᱅ཋឋƴ‫ݣ‬ƢǔСᨂƴ໲ƖႺƢ‫ئ‬ӳᲦ᣻ƍɶ᧓ቩ‫܇‬ǛʼƠƯ WIMPSM ቩ‫᧓܇‬ƷႻʝ˺ဇƕឪƜǔƱे‫ܭ‬ƠᲦƦǕǛஊј‫ئ‬ƷྸᛯǛ̅ƬƯ‫҄ࡸܭ‬ƢǔƜƱƕ‫ٶ‬ƍŵႻʝ˺ဇƴƸǹǫȩȸ‫׹‬ᲦșǯȈȫ‫׹‬ƳƲƷီƳǔǪȚȬȸǿǛ‫ݰ‬λƠƯᲦƦƷΨư WIMP Ʊఋ‫܇‬ƷӒࣖૺ᩿ᆢƴ‫ݣ‬ƢǔСᨂǛ൭Ǌǔŵ‫ ׋‬8(b) ƴᅆƢƷƸᲦ᣻࣎ኒǨȍȫǮȸ
7 TeV ưƷ mono-ǸǧȃȈ੕ኧ [39] Ʊ 8 TeV ưƷ monoW /Z ੕ኧ [41] ƷኽௐƔǒࢽǒǕƨ WIMP-ఋ‫᧓܇‬ƷӒࣖૺ᩿ᆢƴ‫ݣ‬ƢǔСᨂưƋǔŵmono-W /Z ੕ኧƸᲦ

pp → χχ̄ + W ± /Z(→ q q̄ ′ ) Ӓࣖư᭗ƍᢃѣ᣽ǛਤƬƯဃ঺ƞǕƨ W ± /Z ȜǽȳǛҞࢲ R = 1.2 ƷǸǧȃȈư
ϐನ঺ƢǔŵƦƷɥưᲦǸǧȃȈɶƷʚ˳ߐْƷཎࣉǛΨƴ Z → ν ν̄+ǸǧȃȈƳƲƷȐȃǯǰȩǦȳȉǛᨊӊƢǔŵ‫׋‬ƔǒЎƔǔᡫǓᲦឋ᣽ 10 GeV ˌɦᆉࡇƷ᠉ƍ
WIMP ƴ‫ݣ‬ƠƯƸᲦmono-ǸǧȃȈ੕ኧƴǑƬƯႺ੗੕ኧ᬴ܱǑǓӈƠƍСᨂƕࢽǒǕǔŵșǯȈȫ‫׹‬Ⴛʝ˺ဇ

8

Events / 100 GeV

24

100

ATLAS Preliminary
L dt = 14.3 fb -1∫

e+µ ≥6 jets, ≥ 4 b-tags

80

60

Data ( s = 8 TeV)
t’t’ (600)t t +light jetst t +HF jets
ttH
ttV
W+jetsZ+jetsDibosonSingle top
MultijetTot bkg unc.

40

ATLAS 0'+*,*-#05
Status: Lepton-Photon 2013 1''4/'4%+&2  ($.$1'4%+2!ATLAS-CONF-2013-018 "#,'*)-! ATLAS-CONF-2013-051"$ 2!ATLAS-CONF-2013-056 "$!ATLAS-CONF-2013-060 " &.3$

 1*-)+'2

Data / MC

20

0

1.5
1
0.5
0

200 400 600 800 1000 1200 1400 1600 1800 2000

HT [GeV]‫ ׋‬9: ≥ 6 ǸǧȃȈᲦ≥ 4b ǸǧȃȈ᪸؏ưƷ HT Ўࠋ (ɦᢿƸȇȸǿƱȐȃǯǰȩǦȳȉʖेƱƷൔ)ŵ

(D5) Ǜˎ‫ܭ‬Ơƨ‫ئ‬ӳᲦup ‫׹‬Ʊ down ‫׹‬ǯǩȸǯኽӳƷᇷӭƕӒ‫ݣ‬ƷƱƖƴဃơǔദƷ࠮ฏјௐƴǑƬƯᲦW
Ȝǽȳ્‫ݧ‬Ʒ᫁ࡇƕ᫋ᓸƴɥƕǔӧᏡࣱƕƋǔŵƜƷ‫ئ‬ӳᲦmono-W ੕ኧƸ 3 ఐǄƲӈƠƍǹȔȳ᩼̔‫ૺ܍‬᩿‫ ׋‬10: 600 GeV vector-like t′ ǯǩȸǯƴ‫ݣ‬ƢǔСᨂ(್᠆Ƹ BR(t′ → W b)Ღጏ᠆Ƹ BR(t′ → Ht))ŵҾໜƸ
BR(t′ → Zt) = 100% ƴ‫ࣖݣ‬ŵᑥƷᢌƏ᪸؏ƸီƳǔ੕ኧȢȸȉƴ‫ࣖݣ‬ƠƯƍǔŵ

ᆢƷСᨂǛɨƑǔƜƱƕЎƔǔŵƸᲦᙐૠƷǸǧȃȈ (இ˯ρஜ) ƱᙐૠƷ b ǸǧȃȈ (இ3.3

Vector-like トップクォークの探索೅แ೉‫׹‬ưƸǯǩȸǯƱȬȗȈȳƸɤƭƷɭˊƴЎ᫏ƞǕǔŵǫǤȩȪȆǣǛਤƭȊǤȸȖƳᇹׄɭˊƷǯǩȸǯƸᲦ೅แ೉‫׹‬ƱჳႽƠƳƍȒȃǰǹቩ‫܇‬ƷႆᙸƴǑǓǄǅూҲƞǕƯƍǔŵƨƩƠᲦǫǤȩȪȆǣǛғКƠƳƍ vector-like Ƴǯǩȸǯ (VLQ) ƸᲦȒȃǰǹೞನƱƸឋ᣽ྒࢽƷȡǫȋǺȠƕီƳǔƨǊȒȃǰǹቩ‫܇‬ย‫ܭ‬ƔǒƷСᨂƸӖƚƳƍŵǇƨᲦ“ȈȃȗȑȸȈȊȸ”ƱƠƯƷ VLQ(t′ ) ƸᲦȒȃǰǹឋ᣽ǁƷ SM ȈȃȗƔǒƷ᣽‫܇‬ᙀദǛႻൈƢǔƜƱƕưƖǔƱƍƏໜưᲦ“ᐯ໱”Ƴ BSM ǷȊȪǪƷನ঺ᙲእƱƠƯදႸƞǕƯƍǔŵ

Vector-like t′ ǯǩȸǯƸƓǋƴ W bᲦZtᲦHt ƴߐْƢǔƕᲦƦƷߐْЎ‫ޟ‬ൔ (BR) Ƹ t′ Ʒឋ᣽ƱࢊǢǤǽǹȔȳƴ̔‫܍‬Ƣǔŵ೉‫׹‬ƴ̔‫܍‬ƠƳƍ੕ኧǛӧᏡƴƢǔƨǊᲦ‫ݣ‬ဃ঺Ơƨ t′ ƷƏƪ‫ݲ‬ƳƘƱǋɟƭƕЎ‫ޟ‬ൔ

100%ư W b [43]ᲦZt [44]ᲦHt [45] ƴߐْƠƨ‫ئ‬ӳƴஇᢘ҄ƠƨᚐௌǛƦǕƧǕဇॖƢǔŵƦƷᨥᲦӲᚐௌư̅ǘǕǔȇȸǿƸƓʝƍƴ᣻ᙐƠƳƍǑƏʙᝋᢠ৸ǛᘍƏŵƦƷɥưӲᚐௌኽௐǛኵǈӳǘƤǔƜƱưᲦBR(t′ →W b) − BR(t′ → Ht) ࠯᩿Ǜࠢ࠼ƘǫȐȸƢǔŵƜƜưƸɟ̊ƱƠƯᲦt′ t¯′ → Ht + X(H → bb̄) ƴஇᢘ҄Ơƨ੕ኧ [45] ǛኰʼƢǔŵƜƷߐْƴཎࣉႎƳ̮ӭ˯ʚஜ) ưƋǔŵཎƴׄஜˌɥƷ b ǸǧȃȈǛᙲ൭Ơƨ‫ئ‬ӳᲦHt + X ̮ӭƴ‫ݣ‬Ƣǔज़ࡇƸஇǋ᭗ƘƳǔŵ‫ݲ‬ƳƘƱǋɟƭƷȈȃȗƕ semi-leptonic ƴߐْƠƨ‫ئ‬ӳǛ
missᎋƑᲦpT > 25 GeV Ʒ‫ܔ‬ᇌȬȗȈȳᲦET> 20 GeVᲦஇ˯ρஜƷ pT > 25 GeV ǸǧȃȈǛᙲ൭ƢǔŵƦƷࢸᲦȇȸǿǛ b ǸǧȃȈƕʚஜᲦɤஜᲦׄஜˌɥƷ 3 ᡫǓƴЎ!
miss
ƚᲦHT (≡ |plepton|+ET+ |pjetTT |) ЎࠋǛ̅ƬƯ̮ӭǛ੕ƢŵƦƷᨥᲦ≥ 4b ǸǧȃȈ᪸؏Ʒ tt̄ + ǸǧȃȈȐȃ

ǯǰȩǦȳȉ (Alpgen MC ưᚸ̖) Ʒɧ‫ࣱܭ‬Ǜ৮ƑǔƨǊᲦtt̄ + light-flavor (u, d, s, g) ǸǧȃȈƱ tt̄ + heavy-

flavor (bb̄, cc̄) ǸǧȃȈƦǕƧǕƷʙᝋૠǛȑȩȡȸǿƱƠƯᲦb ǸǧȃȈૠƕʚᲦɤᲦׄஜˌɥƷǵȳȗȫƴӷ଺ȕǣȃȈƠƯ MC ƷǹǱȸȫ‫܇׆‬Ǜൿ‫ܭ‬Ƣǔŵ̮ӭƔǒƷ݃ɨƕ MC ƷǹǱȸȫ‫܇׆‬ƴλƬƯƍƳƍƜƱǛ̬ᚰƢǔƨǊᲦ̮ӭƷ݃ɨƕ‫ݲ‬Ƴƍ HT < 700 GeV ᪸؏ưƷȕǣȃȈኽௐƱ໯ჳႽƳƜƱǛᄩᛐƢǔŵ≥ 4b ǸǧȃȈ᪸؏Ʒ HT Ўࠋ (ǹǱȸȫ‫܇׆‬ưᙀദƞǕƨࢸƷ tt̄+ǸǧȃȈǛԃǉ) Ƹ‫ ׋‬9 ƴᅆƞǕƯƍǔŵ‫ ׋‬10 ƴᅆƢƷƸᲦ600 GeV Ʒ vector-like t′ ǯǩȸǯǛˎ‫ܭ‬ƠƨƱƖƴࢽǒǕǔ BR(t′ → W b) − BR(t′ →Ht) ࠯᩿ưƷూҲ᪸؏ưƋǔŵᑥƷຜƍ᪸؏Ɣǒ᪯ƴᲦ
Ht + X [45]ᲦZt + X [44]ᲦW b + X [43] Ʒ੕ኧኽௐƴ‫ࣖݣ‬ƠƯƍǔŵӷᇷӭȬȗȈȳ‫ݣ‬Ǜ̅Ƭƨ੕ኧ [46](ᑥ925

ᘙ 2: Run 1 ưూҲƞǕƨឋ᣽᪸؏ƱᲦ14 TeVᲦ300 fb−1 ưႆᙸӧᏡƳឋ᣽ɥᨂ͌ƷʖेŵూҲ᪸؏ [TeV]ɥᨂ͌Ʒʖे [TeV]< 1.1 ∼ 1.7[0.15, 0.66]∼ 2.7 (mq̃ = mg̃ ) [48]∼ 1.0 (mχ̃01 = 0) [49]

೉‫׹‬

ቩ‫܇‬

ኳཞ७

MSUGRA/CMSSM±
0t̃1 t̃1 , t̃1 → tχ̃1 /bχ̃1
0
0
0
χ̃±
1 χ̃2 → W χ̃1 Z χ̃1q̃, g̃
t̃10χ̃±1 , χ̃2ᙐૠǸǧȃȈ (+ ≥ 1ℓ)

2-3 e, µ< 0.42

SSM Z ′ Ȝǽȳ
SSM W ′ ȜǽȳȐȫǯ RS ˷йഏΨ

Z′
W′
gKK

ee, µµq q̄
tt̄

< 2.86[1.20, 2.29][0.5, 2.0]

Vector-like ǯǩȸǯt′

W b, Ht, Zt< 0.67 ∼ 0.79

1-2b ǸǧȃȈ (+ ≥ 1ℓ)∼ 0.5-0.7 (W Z, mχ̃01 = 0) [49, 50]∼ 5.0 [51]
∼ 4.0 [52]
∼ 4.0 [53]
∼ 1.3 [54]Ʒஇǋᕓƍ᪸؏) ǋԃǊᲦӲ੕ኧȢȸȉƸႻᙀႎƴೞᏡࡇƕɥƕǔƜƱƕЎƔǔƱ࣬ƏŵǇƞƴȆȩǹǱȸȫƷƠᲦBR ƴ᧙ǘǒƣ 600 GeV Ʒ tཋྸǛႺ੗ႆᙸưƖǔዌ‫ڤ‬ƷȁȣȳǹưƋǔŵƜƷႆᙸ′ ǛǄǅూҲƠƯƍǔƜƱƕЎƔǔŵ

ӧᏡࣱǛྵܱƷǋƷƱƢǔǂƘᲦATLAS ଐஜǰȫȸȗɟɺƱƳƬƯᥘॖѐщɶưƋǔŵ4

今後に向けてஜᆜưƸᲦឬ‫ݣ‬ᆅࣱྸᛯǍ˷йഏΨ೉‫׹‬ƳƲƔǒ஖

参考文献

ࢳƞǕǔૼƠƍቩ‫܇‬ƴ໰ໜǛ዁ƬƯᲦ᣻࣎ኒǨȍȫǮȸ[1] ATLAS Collaboration, ATLAS-CONF-2014-013.

7-8 TeV ưƷ੕ኧኽௐƴƭƍƯኰʼƠƨŵᘙ 2 ƴƍƘƭƔƷቩ‫܇‬ƴ‫ݣ‬Ƣǔྵ‫נ‬ƷƓƓǑƦƷឋ᣽ɦᨂ͌ǛǇƱǊǔŵǹǯǩȸǯǍǰȫǤȸȎƳƲƸӈƠƍСᨂƕƭƍƯ

žLHC(ATLASȷCMS) இૼኽௐ IſᲦ ᭗[2] ෌ʟᅙʚᲦ
ǨȍȫǮȸȋȥȸǹ 29-3, 142 (2010).

ƍǔɟ૾ᲦǲȸǸȸȎƴ‫ݣ‬ƠƯƸǇƩǇƩСᨂǋዼƘᲦ੕ኧǋƜǕƔǒஜ఍҄ƢǔƱᚕƬƯǑƍŵ˷йഏΨ೉‫׹‬ƔǒᅆՐƞǕǔ KK ǰȩȓȈȳǍǰȫȸǪȳƳƲƷ᣻ƍૼቩ‫܇‬ƸᲦLEP ƳƲưƷᩓࢊች݅ย‫ܭ‬Ɣǒ 2 ∼ 3 TeV
ˌɦƷឋ᣽᪸؏ƴƋǔӧᏡࣱƸƋǇǓ᭗ƘƳƍŵƜƏ

ƍƬƨƜƱǛᎋƑǔƱᲦǘǕǘǕƸႆᙸӧᏡƳ᪸؏ƴǑƏǍƘឱǛ៊ǈλǕƭƭƋǔᲦƱƍƑǔƔǋƠǕƳƍŵ

LHC ƸᲦ᣻࣎ኒǨȍȫǮȸ 13 TeV ưƷ Run 2 ᆙ΁ƴӼƚƯᲦ2015 ࠰И᪽ƔǒǳȟȃǷȧȋȳǰǛ‫ڼ‬Ǌǔʖ‫[ ܭ‬47] ưƋǔŵྵ‫נ‬ƷƱƜǖᲦ2015 ࠰ବƔǒȐȳȁ
᧓ᨠ 50 ȊȎᅺưჺ஖᧓ (ȇȸǿ᣽ư < 1 fb−1 ᆉࡇ) ᆙ΁ƠƨࢸᲦ25 ȊȎᅺ᧓ᨠưƷȐȳȁᘔᆳƴᆆᘍƢǔᚘဒưƋǔŵ᪯ᛦƴᆆᘍƕᡶǜƩ‫ئ‬ӳᲦ2015 ࠰ٰƷ‫׎‬ᨥ˟ᜭǇưƴƞǒƴ 1 ∼ 2 fb−1 Ⴛ࢘ƷȇȸǿƕࢽǒǕǔƱʖेƞǕƯƍǔŵƜƷ Run 2 И஖ƷȇȸǿᚐௌƴӼƚƯᲦATLAS ϋưǋϋᢿ᫠ួ౨Ј֥Ʒ‫ࢍف‬Ღ᭗ᡮ᫠ួ
ȈȪǬȸƷ᧏ႆᲦȈȪǬȸ᪮ႸƷોᑣƳƲแͳƕბŷƱᡶǜưƍǔŵƪƳǈƴᲦƜǕǒƷ᧏ႆƴǋ ATLAS ଐஜǰȫȸȗƕɶ࣎ႎƳࢫлǛௐƨƠƯƍǔŵ

LHC ƷᚘဒưƸᲦRun 2 ƕ 2018 ࠰ɶ᪭ǇưዓƍƨࢸᲦɟ࠰ҞǄƲƷǷȣȃȈȀǦȳǛኺƯ Run 3 ƕ‫ڼ‬Ǉǔʖ‫ܭ‬ưƋǔŵƜƷ Run ǛԃǊƯᲦᆢЎȫȟȎǷȆǣƕ
ኖ 300 fb−1 ƴПᢋƠƨ‫ئ‬ӳƴ஖ࢳƞǕǔቩ‫܇‬Ʒႆᙸज़ࡇǛᘙ 2 ƴᅆƢŵᘔᆳǨȍȫǮȸƱȫȟȎǷȆǣƷ‫ٻف‬ƷऍऔƸ‫ٻ‬ƖƘᲦྵ‫נ‬ǇưƷឋ᣽ɦᨂ͌Ɣǒ᫠៫ႎƴज़[3] ৎஜᛗᲦᑶ‫׽‬ԧЩžLHC இૼƷᄂᆮኽௐ IIſᲦ ᭗ǨȍȫǮȸȋȥȸǹ 30-1, 116 (2011).
[4] ඾᣼ዮӮᲦ᣿᜿‫܇ځډ‬žLHC இૼƷᄂᆮኽௐ IIIſᲦ᭗ǨȍȫǮȸȋȥȸǹ 30-3, 210 (2011).
[5] ‫ف‬ณᢋʍᲦɶ஭ීʚžLHC இૼƷᄂᆮኽௐ IVſᲦ᭗ǨȍȫǮȸȋȥȸǹ 31-1, 10 (2012).
[6] ‫ݱ‬௎݈ᨺᲦࣈܿΰ‫پ‬žLHC ᬴ܱᡮ‫ – إ‬ᡲ᠍Ʒ᧏‫ڼ‬ƴ݃ƤƯ –ſᲦ ᭗ǨȍȫǮȸȋȥȸǹ 31-2, 65(2012).
[7] ࣈܿΰ‫پ‬žLHC Ʊ ATLAS Ʒᢃ᠃ཞඞƱȒȃǰǹቩ‫܇‬੕ኧſᲦ ᭗ǨȍȫǮȸȋȥȸǹ 31-2, 66(2012).
[8] ‫ޛ‬஭‫ٻ‬೔žLHC ATLAS ᬴ܱ H → γγ ȁȣȳȍȫ
ǛဇƍƨȒȃǰǹቩ‫܇‬੕ኧſᲦ ᭗ǨȍȫǮȸȋȥȸǹ 31-2, 71 (2012).

[9] ဋɶኝɟžLHC ATLAS ᬴ܱ H → ZZ (∗) → 4ℓȁȣȳȍȫǛဇƍƨȒȃǰǹቩ‫܇‬੕ኧſᲦ ᭗ǨȍȫǮȸȋȥȸǹ 31-2, 74 (2012).
[10] ‫ف‬ณᢋʍžLHC ATLAS ᬴ܱ H → W W (∗) →ℓνℓν ȁȣȳȍȫǛဇƍƨȒȃǰǹቩ‫܇‬੕ኧſᲦ ᭗ǨȍȫǮȸȋȥȸǹ 31-2, 77 (2012).

1026[11] ɶ஭ීʚžLHC ATLAS ᬴ܱųૼƠƍȜǽȳƷ
ႆᙸƱʻࢸſᲦ ᭗ǨȍȫǮȸȋȥȸǹ 31-2, 81(2012).
[12] ‫س‬অ‫ٽ‬žLHC ATLAS ᬴ܱ H → τ τ ǛဇƍƨȒȃǰǹቩ‫܇‬Ʒ੕ኧſᲦ ᭗ǨȍȫǮȸȋȥȸǹ 31-3,
183 (2012).
[13] ൨ʟ፯ɟžLHC ATLAS ᬴ܱ H → bb ȁȣȳȍȫ
ǛဇƍƨȒȃǰǹቩ‫܇‬੕ኧſᲦ ᭗ǨȍȫǮȸȋȥȸǹ 31-3, 187 (2012).
[14] ᑶ‫׽‬ԧЩžLHC ATLAS ᬴ܱųȒȃǰǹᄂᆮƷྵཞ ∼2013 ࠰ବ ∼ſᲦ ᭗ǨȍȫǮȸȋȥȸǹ 32-1,
1 (2013).

[15] ‫ݱ‬௎݈ᨺᲦࣈܿΰ‫پ‬žLHC ᬴ܱᡮ‫ – إ‬ᡲ᠍ƷኳǘǓƴ݃ƤƯ –ſᲦ ᭗ǨȍȫǮȸȋȥȸǹ 32-1,
5 (2013).
[16] https://twiki.cern.ch/twiki/bin/view/AtlasPublic[17] https://twiki.cern.ch/twiki/bin/view/CMSPublic/
PhysicsResults[18] ATLAS Collaboration, ATLAS-CONF-2013-047.
[19] ATLAS Collaboration, ATLAS-CONF-2013-062.
[20] ATLAS Collaboration, JHEP 10, 130 (2013),
arXiv:1308.1841.
[21] ATLAS Collaboration, ATLAS-CONF-2013-061.
[22] ATLAS Collaboration, ATLAS-CONF-2013-024.
[23] ATLAS Collaboration, ATLAS-CONF-2013-037.
[24] C. G. Lester, D. J. Summers, Phys. Lett. B 463,
99-103 (1999), arXiv:hep-ph/9906349.
[25] ATLAS Collaboration, CERN-PH-EP-2014-014,
arXiv:1403.4853.
[26] ATLAS Collaboration, ATLAS-CONF-2013-068.
[27] ATLAS Collaboration, JHEP 04, 169 (2014),
arXiv:1402.7029.
[28] ATLAS Collaboration, CERN-PH-EP-2014-037,
arXiv:1403.5294.
[29] ATLAS Collaboration, ATLAS-CONF-2013-093.
[30] G. F. Giudice, M. A. Luty, H. Murayama, and
R. Rattazzi, JHEP 12 027 (1998), arXiv:hepph/9810442.

[31] ATLAS Collaboration, Phys. Rev. D 88, 112006(2013), arXiv:1310.3675.
[32] ATLAS Collaboration, ATLAS-CONF-2013-017.
[33] L. Randall, R. Sundrum, Phys. Rev. Lett. 83,
3370-3373 (1999), arXiv:hep-ph/9905221.
[34] CMS Collaboration, CMS-PAS-EXO-12-059.
[35] ATLAS Collaboration, ATLAS-CONF-2012-148.
[36] D. Krohn, J. Thaler, and L.-T. Wang, JHEP
1002 084 (2010), arXiv:0912.1342.
[37] ATLAS Collaboration, ATLAS-CONF-2013-052.
[38] N. Arkani-Hamed, S. Dimopoulos, and G. Dvali,
Phys. Lett. B 429, 263-272 (1998), arXiv:hepph/9803315.
[39] ATLAS Collaboration, ATLAS-CONF-2012-147.
[40] CMS Collaboration, CMS-PAS-EXO-12-048.
[41] ATLAS Collaboration, CERN-PH-EP-2013-158,
arXiv:1309.4017.
[42] ATLAS Collaboration, JHEP 04, 075 (2013),
arXiv:1210.4491.
[43] ATLAS Collaboration, ATLAS-CONF-2013-060.
[44] ATLAS Collaboration, ATLAS-CONF-2013-056.
[45] ATLAS Collaboration, ATLAS-CONF-2013-018.
[46] ATLAS Collaboration, ATLAS-CONF-2013-051.
[47] http://lhc-commissioning.web.cern.ch/lhccommissioning/[48] ATLAS

Collaboration,

ATLAS-PHYS-PUB-

Collaboration,

ATLAS-PHYS-PUB-

2013-002.
[49] ATLAS
2013-011.
[50] CMS Collaboration, CMS-PAS-FTR-13-014.
[51] CMS

Collaboration,

CMS-NOTE-13-002,

arXiv:1307.7135.
[52] http://indico.cern.ch/event/173388/[53] ATLAS

Collaboration,

ATLAS-PHYS-PUB-

2013-003.
[54] CMS Collaboration, CMS-PAS-FTR-13-026.