1245

˙ ‫঺ڀݚ‬հ

LHC ATLAS ࣮‫ ݧ‬Run 1 ώοάεཻࢠͷ‫ڀݚ‬ʔൃ‫͔ݟ‬Βଌఆ΁ʔ౦‫ژ‬େֶૉཻࢠ෺ཧࠃࡍ‫ڀݚ‬ηϯλʔాத ७ҰJunichi.Tanaka@cern.ch
2015 ೥ (ฏ੒ 27 ೥) 2 ݄ 13 ೔1͸͡Ίʹʮώοάεཻࢠͷൃ‫ݟ‬ʯ [1, 2] ͱ͍͏ૉཻࢠ෺ཧֶ࢙

ʹ࢒Δ੒ՌΛ‫ ͨ͛ڍ‬ATLAS ࣮‫ ͱݧ‬CMS ࣮‫ݧ‬͸‫ࡏݱ‬,2015 ೥य़͔Βͷ࣮‫࠶ݧ‬։ʹ޲͚ͯ‫ٸ‬ϐονͰ༷ʑͳ࡞
‫ۀ‬ΛਐΊ͍ͯΔɻ͜ͷ 2 ೥ (2013-2014 ೥) ͷ LHC Ճ଎√

s =7 TeV ͰͦΕͧΕ໿ 0.04 fb−1 , ໿ 5 fb−1 , 2012√೥͸ए‫ׯ‬ΤωϧΪʔΛ্͛ͯ s =8 TeV ͰӡసΛߦ͍
໿ 22 fb−1 ͷσʔλΛऔಘͨ͠ɻϐʔΫϧϛϊγςΟ͸
͸

7.7×1033 cm−2 s−1 ʹ౸ୡͨ͠ɻཅࢠ · ཅࢠͷඇ஄ੑࢄཚ
ͷஅ໘ੵ (໿ 80 mb) Λߟ͑Δͱ LHC Ͱ͸ཅࢠόϯνಉ࢜ͷ 1 ౓ͷަࠩͰཅࢠ · ཅࢠͷিಥ͕ 1 ౓͚ͩͰ͸ͳ͘‫ث‬ͷ‫ࢭٳ‬த, ATLAS ࣮‫ݧ‬͸ Run 1 1 Ͱಘͨσʔλͷཧෳ਺ੜ͡Δͷ͕෼͔Δ 3 ɻϧϛϊγςΟͷ্ঢͱͱ΋ʹղΛਐΊΔͱ‫ʹڞ‬ղੳख๏΋վળ͠, ͜ΕΒͷৄࡉͳ಺͜ͷස౓͕૿͑ 2011 ೥ͷσʔλͰ͸ฏ‫ Ͱۉ‬9 িಥ, 2012༰Λ‫ؚ‬Μͩ, ͍ΘΏΔʮαϚϦʔʯ࿦จΛग़൛͢ΔͨΊ೥Ͱ͸ 21 িಥʹͳͬͨɻ͜ͷΑ͏ͳଟॏিಥΛʮύΠϧͷ‫ڀݚ‬Λߦ͖ͬͯͨɻώοάεղੳͷ৔߹, େࡶ೺ʹ‫ݴ‬Ξοϓʯͱ‫Ϳݺ‬ɻσʔλղੳͰ͸ύΠϧΞοϓͷޮՌΛ͏ͱώοάεཻࢠͷ่յաఔ͝ͱʹʮαϚϦʔʯ࿦จΛ

Ͱ͖Δ͚ͩഉআ͢Δख๏ͷ։ൃ΍ύΠϧΞοϓͷ਺ʹͳ࢓্͛, ࠷‫ͦʹޙ‬ΕΒΛ౷‫ܭ‬తʹ·ͱΊͯʮେαϚϦʔʯΔ΂͘ґଘ͠ͳ͍ม਺΍ΧοτΛಋೖͨ͠ɻLHC Ճ଎√‫ث‬͸ 2015 ೥ͷय़͔Β s =13 TeV 4 ͰӡసΛ࠶։͢Δɻͷ࿦จΛग़൛͢Δ 2 ɻຊߘ΋ ATLAS ࣮‫ݧ‬ͷώοάεཻࢠʹؔ͢Δ‫ڀݚ‬ͷʮαϚϦʔʴେαϚϦʔʯ࿦จͷʮαϚϦʔʯͷ༧ఆͰґཔΛड͚͕ͨ, ࢒೦ͳ͕Βେ‫ݧ࣮ܕ‬ͷಛ༗ͷ໰୊Ͱ݁߹ఆ਺ͳͲͷʮେαϚϦʔʯ͸஗ΕͨͨΊ, ʮαϚϦʔʯ࿦จͷʮαϚϦʔʯʹཹ·ͬͨɻʮେαϚϦʔʯ࿦จ͸ʮ΋͏͙͢ग़·͢ʯͱ͍͏͜ͱͰ, ࣮ࡍʹग़൛͞ΕͨΒಡΜͰ௖͖͍ͨɻATLAS ࣮‫ݧ‬͸ LHC ͷ 4 ͭͷओ࣮‫ݧ‬ͷதͷ 1 ͭͰ, ୈ
2 ͷώοάεཻࢠ΍௒ରশੑཻࢠͳͲͷൃ‫ݟ‬Λ໨ࢦͨ͠໿ 3000 ਓͷ‫͔ऀڀݚ‬ΒͳΔେ‫ڞࡍࠃܕ‬ಉ࣮‫͋Ͱݧ‬ΔɻҰॹʹώοάεཻࢠΛൃ‫ ͨ͠ݟ‬CMS ࣮‫ݧ‬΋ LHC ࣮‫ݧ‬
ͷ 1 ͭͰ͍ͪૣ͘໘ന͍࣮‫݁ݧ‬ՌΛग़͢ͱ͍͏఺Ͱ͸͓‫ʹ͍ޓ‬ϥΠόϧؔ܎ʹ͋ΔɻATLAS ࣮‫ʹݧ‬͸೔ຊ͔Β
͸ 17 ͷ‫ · ؔػڀݚ‬େֶ͔Β໿ 120 ໊ͷ‫ࢀ͕ऀڀݚ‬Ճ͠,

2

LHCɾATLAS ࣮‫ݧ‬͜ͷώοάεཻࢠͷσʔλղੳʹ΋ଟ͘ͷਓ͕‫ܞ‬Θ͍ͬͯΔɻ

LHC (Large Hadron Collider) [3] ͸εΠε · δϡωʔϒ߫֎ʹ͋Δ CERN Ͱ‫ݐ‬ઃ͞Εͨੈք࠷େͷཅࢠ · ཅࢠিಥ‫ܕ‬ͷେ‫ܕ‬Ճ଎‫͋Ͱث‬ΔɻҰप 27 km ͷ‫ڊ‬େͳՃ

3ώοάεཻࢠͷੜ੒ͱ่յ

଎‫͕ث‬஍Լ 100 m ʹ͋Δτϯωϧʹઃஔ͞Ε, 2010 ೥√य़͔Βॏ৺‫ܥ‬ΤωϧΪʔ s =7 TeV Ͱຊ֨తʹӡస√Λ։࢝ͨ͠ɻ s =14 TeV Ͱ࣮‫ݧ‬Λߦ͏༧ఆͰ͋ͬͨ

Ͱੜ੒͞Ε, ओʹ 5 ͭͷաఔͰ่յ͢Δɻਤ 1 ʹώοά͕, 2008 ೥ͷळʹ௒఻ಋ࣓ੴͷ݁߹෦෼ͷ઀ଓෆྑͰ‫ى‬ͷେ͖͍ॱʹද͢ɻ(a) ͸ 2 ͭͷάϧʔΦϯ͔Βॏ͍࣭ͬͨ͜ࣄ‫[ ނ‬4] ͷͨΊຊ֨తͳิमΛߦ͏·Ͱ͸ΤωϧΪʔΛԼ͛ͯӡసΛߦ͏͜ͱʹͨ͠ɻ2010 ೥ͱ 2011 ೥
1 2010-2012 ೥ͷ √s =7 TeV, 8 TeV ͷ࣮‫ؒظݧ‬Λ Run 1 ͱ‫ݺ‬Ϳɻ·ͨ, ͜ΕʹͳΒͬͯ 2015-2018 ೥ͷୈ 2 ‫ظ‬ͷ࣮‫ؒظݧ‬Λ Run 2ͱ‫Ϳݺ‬ɻ
2 ATLAS ࣮‫ ͱݧ‬CMS ࣮‫ݧ‬ͷ݁Ռͷ౷߹΋४උதͰ, ࣭ྔଌఆʹ͍ͭͯ͸य़͝Ζʹ͸ެ։͞ΕΔ༧ఆͰ͋Δɻ

ඪ४ཧ࿦ͷώοάεཻࢠ͸ LHC ʹ͓͍ͯ 4 ͭͷաఔεཻࢠͷ 4 ͭͷੜ੒աఔͷϑΝΠϯϚϯਤΛੜ੒அ໘ੵ
ྔͷΫΥʔΫͷϧʔϓΛհͯ͠ώοάεཻࢠ͕ੜ੒͞ΕΔάϧʔΦϯ༥߹աఔ (ggF) Ͱ͋Δɻ࣍ʹେ͖͍ੜ੒அ
3 80mb × 7.7 × 1033 cm−2 s−1 ÷ 20MHz =∼ 30 ճ/όϯνিಥɻ

4 2015 ೥͸͜Ε·Ͱͷςετ݁ՌΛड͚ͯ 13 TeV Ͱӡస͢Δɻ
2016 ೥Ҏ߱͸ 2015 ೥ͷӡస࣮੷ʹΑͬͯ͸ 14 TeV Ͱӡస͢ΔՄ
ೳੑ͕͋Δɻ

2246

໘ੵΛ࣋ͭ VBF (Vector boson fusion) աఔ (b) ͸, ֤ཅࢠͷΫΥʔΫ͔ΒϕΫλʔϘιϯ͔Β์ग़͞Ε, ͦΕγγ ͱͷରൺ΍࣭ྔʹൺྫ͢Δͱ͍͏౬઒݁߹ͷ࣮ূ͕௚઀ՄೳʹͳΔɻͯલ‫์ʹ޲ํޙ‬ग़͞ΕΔɻ͜ΕΒΛ 2 δΣοτͱͯ͠‫؍‬
ଌ͢Δ͜ͱͰ, ͜ͷੜ੒աఔΛੵ‫ۃ‬తʹબ୒͢Δ͜ͱ͕
Ͱ͖Δɻ(c) ͸ώοάεཻࢠ͕ήʔδϘιϯ͔Β์ग़͞
ΕΔ V H աఔͰ, ήʔδϘιϯ༝དྷͷൺֱతߴ͍ԣӡಈ

pp → Hσ(pp → H+X) [pb]λʔϘιϯΛ์ग़ͨ͠ΫΥʔΫ͕ߴ͍ԣӡಈྔ pT Λ࣋ͬ(NNLO+N

NLL QC

D + NLO10pp → qqH1ྔΛ࣋ͭϨϓτϯ΍χϡʔτϦϊ༝དྷͷେ͖ͳফࣦԣΤ√ωϧΪʔ͕ੜ͡Δɻਤ 2 ͸ s =8 TeV ʹ͓͚Δ֤ੜ੒

10աఔʹର͢Δώοάεཻࢠͷੜ੒அ໘ੵΛࣔ͢ɻ͜ͷੜ

10-2

pp →

bbH

pp →
(NN

LO Q

pp →

-1

CD

pp →
in 5F

WH

ZH (N

(NNLO QC

NLO

S, N

s= 8 TeV
EW)

D + NLO

(NNL

LO Q

CD

ttH (N

O QC

QCD

D+N

+NL

in 4F

EW)

LO E

O EW

S)

LHC HIGGS XS WG 2014͕༥߹ͯ͠ώοάεཻࢠ͕ੜ੒͞ΕΔɻ͜ͷͱ͖, ϕΫ

)

W)

LO Q

CD)

੒அ໘ੵͷਤΛΑ͘‫ݟ‬Δͱ, ਤ 1(d) ͷώοάεཻࢠ͕80ϧʔϓΛհͣ͞ʹτοϓΫΥʔΫ͔Βੜ੒͞ΕΔ tt̄H ϓ

90 100200

300
MH [GeV]ϩηεΑΓ, bb̄H ϓϩηεͷํ͕அ໘ੵ͕େ͖͍͜ͱ͕
෼͔Δɻ͜ͷϓϩηε͸ϘτϜΫΥʔΫͷԣӡಈྔ͕খਤ 2: ֤࣭ྔʹର͢Δ LHC 8 TeV ʹ͓͚Δඪ४ཧ࿦ͷ͍ͨ͞Ί, Run 1 ‫ؒظ‬தͷղੳͰ͸άϧʔΦϯ༥߹աఔώοάεཻࢠͷੜ੒அ໘ੵ [5]ɻHiggs BR + Total Uncert͖ͪΜͱධՁ͢ΔΑ͏ʹͳͬͨ (݁Ռ͸΄ͱΜͲมΘΓ·ͤΜ͕)ɻ

1

LHC HIGGS XS WG 2013ͷൣᙝͰ͕͋ͬͨ, ʮαϚϦʔʯ࿦จͰ͸ଟ͘ͷղੳͰ
WW
bb

10-1

ττ

gg

ZZ

cc

10-2
γγ

Zγ

120

140

10-3
(a) άϧʔΦϯ༥߹(b) VBFµµ

10-480

100

160

180

200

MH [GeV]ਤ 3: ֤࣭ྔʹର͢Δඪ४ཧ࿦ͷώοάεཻࢠͷ่յ෼‫ذ‬ൺ [5]ɻ

(c) V H, V = W or Z(d) tt̄Hਤ 1: LHC ʹ͓͚Δώοάεཻࢠͷ 4 ͭͷҟͳΔੜ੒աఔɻ

4ώοάεཻࢠ୳ࡧ
֤ղੳνϟϯωϧͷղੳͷํ਑΍ྲྀΕΛ؆୯ʹ·ͱΊ,Πϕϯτ௒աͷ༗ҙ౓΍ µ ஋ (‫ޙ‬ड़) Λใࠂ͢Δɻ࣭ྔͳͲͷͦͷ΄͔ͷଌఆ͸ 5 ষͰड़΂Δɻώοάεཻࢠ͸ੜ੒͞ΕΔͱ௚ͪʹ่յ͢Δ͕, ൃ‫ݟ‬σʔλղੳͷେ͖ͳྲྀΕ͸, τϦΨʔΛ௨աͨ͠Πϕ࣭ͨ͠ྔ 125 GeV ෇ۙͰ͸ W W, ZZ, γγ, bb̄, τ τ ͳͲϯτʹώοάεཻࢠͰ͋Ε͹ຬͨ͢Ͱ͋Ζ͏৚݅Λ͔͚ʹ่յ͢Δɻਤ 3 ͸ͦͷ่յ෼‫ذ‬ൺͰ, ͜ͷ 5 ͭͷதͰͯΠϕϯτΛબ୒ͨ͠ͷͪ, ౷‫ॲܭ‬ཧΛߦ༷ͬͯʑͳ෺ཧ

͸ bb̄ ͕࠷΋େ͖͘, γγ ͕࠷΋খ͍͜͞ͱ͕෼͔Δɻ·݁ՌΛࢉग़͢Δɻ͜ͷΠϕϯτબ୒ʹ͓͍ͯ, ͍͔ͭ͘ͷͨ, ͜ͷਤΛோΊΔͱ 125 GeV ͱ͍͏࣭ྔྖҬ͸‫ظ‬଴͞ΧςΰϦΛઃ͚ͯ, ΠϕϯτΛ෼ྨ͢Δɻ͜Εʹ͸େ͖͘

ΕΔ͢΂ͯͷ่յϞʔυΛ LHC Ͱ‫ݟ‬Δ͜ͱ͕ՄೳͰ͋
Γ, ώοάεཻࢠΛਫ਼ࠪ͢Δʹ͸޷౎߹ͳ࣭ྔྖҬͰ͋

2 ͭͷ໨త͕͋ͬͯ, ͻͱͭ͸ S/B (γάφϧ S ͱόοΫάϥ΢ϯυ B ͷൺ) ͕ྑ͍ΧςΰϦͱͦ͏Ͱͳ͍ΧςΰΔɻ͍ۙকདྷ, Zγ ΍ µµ νϟϯωϧ΋‫؍‬ଌͰ͖Δ͸ͣͰ,ϦΛઃ͚Δ͜ͱͰൃ‫౓ײݟ‬΍ଌఆਫ਼౓Λ޲্ͤ͞Δ͜ͱ,

3247

ද 1: ֤ղੳνϟϯωϧʹ͓͍ͯ஫໨ͨ͠ΧςΰϦɻggF-

tag ΧςΰϦ͸ VBF-tag ͳͲͰ࢒ͬͨΠϕϯτͷΧς
ggF-tag (untag)√√√√

VBF-tag√√√√

H → γγ νϟϯωϧ

͜ͷνϟϯωϧͰ͸ 2 ͭͷޫࢠ͔Β࠶ߏ੒͞ΕΔώοάεཻࢠͷෆม࣭ྔ (mγγ ) ͷ෼ղೳΛ޲্ͤ͞Δ͜ͱ

ΰϦͰ͋ΔͨΊ untag ͱ΋‫͏ݴ‬ɻ
H→ γγ [6]H→ ZZ ∗ [7]H→ W W ∗ [8]H→ τ τ [9]H→ bb̄ [10]4.1͕ॏཁͰ͋ΔɻͦͷͨΊʹ͸֤ޫࢠͷΤωϧΪʔͱ 2 ͭ

V H-tag√√tt̄H-tag
√

(*)
(*)
√

(*)

֯౓ଌఆʹ͍ͭͯ͸ [6] ͳͲΛࢀߟʹͯ͠΋Βͬͯ, ͜(*)͜Ͱ͸ࠓճվળͨ͠ޫࢠͷΤωϧΪʔֱਖ਼ʹ͍ͭͯઆ໌

ͷޫࢠؒͷ֯౓Λਫ਼౓Α͘ଌఆ͢Δ͜ͱ͕ඞཁʹͳΔɻ͢Δɻ
ిࢠ΍ޫࢠͷΤωϧΪʔ͸, ΧϩϦϝʔλʹམͱ͠΋͏ͻͱͭ͸ 3 ষͰઆ໌֤ͨ͠ੜ੒ϓϩηεʹಛԽͨͨ͠ΤωϧΪʔΛग़ൃ఺ʹ༷ͯ͠ʑͳิਖ਼Λߦͬͯ‫ٻ‬ΊΧςΰϦΛઃ͚Δ͜ͱͰͦͷੜ੒աఔͷ৘ใΛऔΓग़͢

ΔɻATLAS ࣮‫ݧ‬ͷి࣓ΧϩϦϝʔλ (|η| <3.2, ͨͩ͜ͱͰ͋Δɻද 1 ʹ, ֤ղੳνϟϯωϧ [6, 7, 8, 9, 10]͠, ՙిཻࢠΛ࠶ߏ੒Ͱ͖ΔྖҬ͸ |η| <2.47) ͸ pre-ͰͲͷੜ੒աఔʹಛԽͨ͠ΧςΰϦΛઃ͚͔ͨΛ·ͱΊ
ͨɻ(*) Ͱࣔͨ͠ V H ΍ tt̄H ʹ͍ͭͯ͸‫ݸ‬ผͷ࿦จΛ

sampler(|η| < 1.8) Λ‫ؚ‬ΊͯԞߦํ޲ʹ 4 ૚ߏ଄Λ࣋ͬͨαϯϓϦϯά‫ܕ‬ͷ‫ݕ‬ग़‫Ͱث‬, ୯Ұ૚ͷશ‫ٵ‬ऩλΠϓͷ४උதͰ͋Δɻ·ͨ, ͢΂ͯͷղੳνϟϯωϧͰҎԼʹCMS ࣮‫ͱݧ‬σβΠϯ͕େ͖͘ҟͳΔɻิਖ਼͸େ͖͘෼

આ໌͢ΔΑ͏ʹଟม਺ղੳख๏ (Multivariate analysis,
MVA) ΛऔΓೖΕ͍ͯΔɻ͜Ε͸, όοΫάϥ΢ϯυͷ

͚ͯ 2 छྨ͋ͬͯ, ͻͱͭ͸Ͱ͖Δ͚ͩ‫ݸ‬ʑͷηϧ, ૚,औΓѻ͍ʹ‫׳‬Ε, ૬ؔͷ͋ΔΑ͏ͳม਺Λ͍͔ʹ࣮σʔର͢Δิਖ਼Ͱ͋Δɻ‫ऀޙ‬͸લऀͷิਖ਼ͰͰ͖Δ͚ͩ‫ݸ‬ੑλͰνΣοΫ͢Δ͔ͳͲͷख๏Λ։ൃ͢Δ͜ͱ͕Ͱ͖ͨ

Λͳͨ͘͠ঢ়ଶͰߦ͏࠷ऴิਖ਼ͱ‫͍͍ͯͬݴ‬ɻ·ͣόϨͨΊͰ͋ΔɻͦͷͨΊ, ͦΕͧΕͷղੳͰҎલʹެ։͠ϧྖҬ (|η| <1.475) Ͱίϯόʔδϣϯ͠ͳ͔ͬͨޫࢠʹͨղੳʹൺ΂ͯ µ ஋ͳͲͷਫ਼౓Ͱ 10%͋Δ͍͸ͦΕҎ͍ͭͯ͸ ∆η × ∆φ =3×5(=0.075×0.125) 5 Ͱଌఆͨ͠

্ͷվળΛߦ͏͜ͱʹ੒ޭ͍ͯ͠ΔɻMVA ʹ͸༷ʑͳख๏͕͋Δ͕, ΘΕΘΕ͸ओʹ BDT (Boosted decisiontree) Λ࢖͍ͬͯΔɻNN (Neural network) ΋͍͔ͭ࣌ؒ͘ͳͲͰෆ‫ۉ‬ҰੑΛͳ͘͢ิਖ਼, ΋͏ͻͱͭ͸શମʹΤωϧΪʔʹରͯ͠, high-voltage ‫ݯى‬ͷิਖ਼ (ಛఆͷΧϩϦϝʔλͷྖҬͰ͸༧ఆ͍ͯͨ͠ઃఆ஋Ҏ֎ͷ΋ͷΛ࢖ͬͨɻ·ͨ, ࣮‫ؒظݧ‬தʹύΠϧΞοϓͷ૿Ճʹ൐͏ͷղੳͰ࢖ΘΕ͍ͯΔɻ

ϊΠζআ‫ڈ‬ͷͨΊʹ pre-sampler ͷ high-voltage Λঃʑµ ஋ͱ local p0 ʹ‫͍ͨͮج‬༗ҙ౓ (significance) ͕සൟʹग़ͯ͘ΔͷͰ͜͜Ͱઆ໌͓ͯ͘͠ɻµ ஋͸‫؍‬ଌͨ͠ʹ௿͘ઃఆͨ͠ɻ), ‫ݕ‬ग़‫ث‬ͷॏ͞ʹΑΔΏ͕Έͷิਖ਼,ώοάεཻࢠͷ਺Λඪ४ཧ࿦ͷώοάεཻࢠͰ‫ظ‬଴͞ΕΛߦͬͨɻ͜ΕΒͷิਖ਼ͷ༗ޮੑ͸࣮σʔλͰ W → eνΔ਺ʹ‫֨ن‬Խͨ͠΋ͷͰ, ඪ४ཧ࿦ͱҰக͢ΔͳΒ µ = 1

ҟͳΔ Gain ઃఆʹΑΔΤωϧΪʔ஋ͷҧ͍ͷิਖ਼ͳͲ΍ Z → ee ͷిࢠΛ༻͍ͯ, E/p(ΧϩϦϝʔλͰଌఆʹͳΔɻ1 ΑΓେ͖͍৔߹͸ଟΊʹ, খ͍͞৔߹͸গͳͨ͠ΤωϧΪʔ E ͱඈ੻‫ݕ‬ग़‫Ͱث‬ଌఆͨ͠ӡಈྔ p ͷΊʹ‫؍‬ଌͨ͜͠ͱʹͳΔɻ͜Ε͸ώοάεཻࢠͱͷ݁߹ൺ) ΍ mee (2 ͭͷిࢠ͔Β࠶ߏ੒ͨ͠ෆม࣭ྔ) ͷ෼෍ͷ‫͞ڧ‬Λࣔ͢࠷΋୯७Խͨ͠ଌఆྔͰ͋Δɻ·ͨ, µ ஋͔Β‫ͨ͠ূݕ‬ɻATLAS ‫ݕ‬ग़‫ث‬ͷΧϩϦϝʔλͷલʹ͸

͕ 0 ΑΓ౷‫ܭ‬తʹ༏Ґʹେ͖͚Ε͹ʮൃ‫ݟ‬ʯΛҙຯ͢ΔιϨϊΠυ࣓ੴΛ‫ؚ‬Ίͯଟ͘ͷ෺࣭͕͋Γ, ϞϯςΧϧ͕, ΑΓద੾ͳ൑அͷͨΊͲͷఔ౓όοΫάϥ΢ϯυͷ

ϩγϛϡϨʔγϣϯ (MC) ͰͷΧϩϦϝʔλલํͷ෺࣭༳Β͗Ͱ‫͜ى‬Γ͑Δͷ͔Λදͨ֬͠཰ local p0 Λ༻͍ྔͷ࠶‫ݱ‬ੑ͸େ͖ͳ՝୊Ͱ͋Δɻి࣓γϟϫʔͷൃలʹ

ΔɻΠϕϯτ௒ա͕͋Δͱখ͘͞ͳΔྔͰ, ΘΕΘΕͷ

૬౰͢Δ૚ (ؒ) ͷϨεϙϯεΛ‫ݟ‬Δ͜ͱͰɺ෺࣭ྔΛ‫ۀ‬քͰ͸ 2.9×10−7 Ͱʮൃ‫ݟ‬ʯͱͳΔɻ·ͨ, ͜ΕΛਖ਼ධՁ͠ɺඞཁ͕͋Ε͹ิਖ਼͢Δɻ࣮ࡍʹิਖ਼ͨ͠ͷ͸‫ن‬෼෍ͷ༗ҙ౓ʹম௚͢ͱ 5σ ʹͳΔɻ5 ষͰใࠂ͢Δ

pre-sampler ͱʮୈ 1 ૚ vs ୈ 2 ૚ʯͰ͋Δɻୈ 3 ૚ʹಧ͘·Ͱʹ෺࣭ྔ͕ 20X0 (X0 =radiation length) Λ௒͑ΔͨΊୈ 3 ૚ʹ͍ͭͯ͸ಛผͳิਖ਼͸ߦ͍ͬͯͳ͍ɻ·Α͏ʹ ATLAS ࣮‫Ͱݧ‬ͷώοάεཻࢠͷ࣭ྔͷத৺஋͸

125.36 GeV ͱଌఆͨͨ͠Ί, ͜ͷ࣭ྔ (125.36 GeV or
125.4 GeV) Ͱͷ µ ஋ͳͲΛ͜͜Ͱ͸Ҿ༻͢Δɻ
ຊߘͰ͸औΓ্͛ͳ͍͕ H→ µµ [11], H→ Zγ [12],ϛϡʔΦϯ (MIP) Λ࢖ͬͯσʔλͱ MC Λൺֱͯ͠ิਖ਼

H→ invisible [13] ͳͲͷղੳνϟϯωϧʹ͍ͭͯ΋࿦ΛߦͬͨɻPre-sampler ʹ͍ͭͯ͸ W ΍ Z ͔Βͷిࢠจ͕͢Ͱʹग़൛͞Ε͍ͯΔɻ౷‫͕ܭ‬ෆ଍͍ͯ͠Δ఺͸Λ༻͍ͯ௚઀ΤωϧΪʔ෼෍Λൺֱͯ͠ิਖ਼Λߦͬͨɻ

Run2 ΍ͦΕҎ߱ͷେྔͷσʔλͰࠀ෰͢Δ͜ͱ͕Ͱ͖
Δɻ·ͨ, H→ invisible ͷ݁Ռ͔Β (ҰఆͷԾఆͷԼͰ)҉ࠇ෺࣭ʹؔ͢Δ੍‫ݶ‬Λ෇͚Δ͜ͱ΋Ͱ͖ΔͷͰ, ‫ڵ‬ຯͷ͋Δํ͸࿦จΛಡΜͰ͍͖͍ͨͩͨɻ

ͣʮୈ 1 ૚ vs ୈ 2 ૚ʯʹ͍ͭͯ͸ Z → µµ Πϕϯτͷ

5 ATLAS ࣮‫ݧ‬ͷΧϩϦϝʔλͰ͸ η, φ ํ޲ͱ΋ 0.025 ͱ͍͏αΠζΛ‫ج‬४ʹΫϥελαΠζͳͲΛ‫ه‬ड़͢Δɻͨͱ͑͹, ∆η ×∆φ =3×5
͸ η ํ޲ʹ 3 ͭ, φ ํ޲ʹ 5 ͭͷ߹‫ ܭ‬15 ‫ݸ‬ͷྖҬΛ͍͏ɻόϨϧྖҬͰίϯόʔδϣϯͨ͠ޫࢠ͸ ∆η × ∆φ =3×7, ͦΕҎ֎ͷྖҬͰ
͸ 5×5ɻ

4248

Ҏ্ͷΑ͏ͳࡉ͔͍ิਖ਼Λߦͬͨ‫ޙ‬, γϟϫʔͷҐஔ΍λͱ MC Ͱͷ৴߸ྖҬͷ෼෍ͷ෯ͷ߹͍۩߹͕վળ͠

Ԟߦํ޲ͷ৘ใ, ίϯόʔδϣϯ͔Ͳ͏͔ͳͲͷ৘ใΛͨ͜ͱ͕ओͳཁҼͷͻͱͭͰ͋Δɻ࢖ͬͯ MC Ͱ‫ٻ‬ΊͨΤωϧΪʔֱਖ਼Λσʔλʹ΋ద༻ͯ͠ΤωϧΪʔΛࢉग़͢Δɻ࠷‫ ʹޙ‬Z → ee ͷ mee ϐʔΫΛ༻͍ͯ࠷ऴతͳશମతͳิਖ਼Λߦ͍, ͦΕΛ J/ψ ΍

4.2

H → ZZ (∗) → 4ℓ νϟϯωϧΥ Ͱ֬ೝͨ͠ɻޫࢠ͸ిࢠͱ‫׬‬શʹಉ͡ి࣓γϟϫʔΛߦΘͳ͍͕‫ݪ‬ཧ͸ಉ͡Ͱ͋ΔͨΊ, ిࢠͷৼΔ෣͍͕ద͢ΔνϟϯωϧͰ, ੜ੒͞ΕΔ਺͕গͳ͍ͷͰγάφϧ੾ʹ࠶‫͍͖ͯͰݱ‬Ε͹, ޫࢠ΋ద੾Ͱ͋Δͱߟ͑Δɻ΋ΛऔΓ͜΅͢͜ͱͳ͘ั·͑Δ͜ͱ͕ॏཁͰ͋Δɻλ΢ώοάεཻࢠ͕ ZZ (∗) Λհͯ͠ 4 ͭͷϨϓτϯʹ่յ

ͪΖΜ, ͦͷ‫ূݕ‬͸ඞཁͰ࣮σʔλͰ Z → ℓℓγ ͷ γ Λཻࢠ͸‫ݕ‬ग़‫่Ͱ಺ث‬յͯ͠͠·͏ͨΊղੳʹ͸‫ؚ‬Ίͣ,༻͍ͯΤωϧΪʔֱਖ਼ͷద੾͞Λ֬ೝͨ͠ɻ࠷ऴతʹޫిࢠͱϛϡʔΦϯΛ࢖ͬͯ୳ࡧΛߦ͏ɻZ Ϙιϯͷ่յࢠͷΤωϧΪʔεέʔϧͷෆఆੑ͸ 0.2-0.3%ఔ౓ 6 ʹϞʔυΛߟ͑Δͱ, 4e, 2e2µ, 4µ ͷ૊Έ߹Θ͕ͤ͋Δɻ

཈͑Δ͜ͱʹ੒ޭͨ͠ [14]ɻ

125 GeV ෇ۙͰ͸ 2 ͭͷ Z Ϙιϯͷ͏ͪ, (গͳ͘ͱ∑ weights / GeV΋) ยํ͸ oﬀ-shell ʹͳΔͨΊͦͷΑ͏ͳ Z ͷ่յ͔Β
160∫ L dt = 4.5 fb , s = 7 TeV-1∫ L dt = 20.3 fb , s = 8 TeV

140

Signal strength categories

180

-1

ATLAS

ੜ͡Δӡಈྔͷ௿͍Ϩϓτϯ·Ͱั·͑Δඞཁ͕͋Δɻ

DataͦͷͨΊόοΫάϥ΢ϯυ͕૿͑ͯ͠·͏͕, গʑόο

S/B weighted sum

Signal+backgroundΫάϥ΢ϯυ͕ଟͯ͘΋γάφϧ͕ଘࡏ͢Ε͹ඇৗʹ

Background120Ӷ͍ϐʔΫΛ‫؍‬ଌ͢Δ͜ͱ͕Ͱ͖ΔͷͰ‫ڪ‬ΕΔ͜ͱ͸ͳ

Signalm H = 125.4 GeV

100͍ɻ࣮ࡍͷ݁Ռ (࣭ྔ෼෍) Λ‫ݟ‬Δͱ, ϐʔΫΛ‫ݟ‬Δղੳ

80

ͷ༏ҐੑΛ࣮‫ํͨ͠ײ‬΋ଟ͔ͬͨͱࢥ͏ɻ4 ͭͷϨϓτ60

ϯͷ pT ͷ৚݅͸্͔Β 20 GeV, 15 GeV, 10 GeV Ͱ, 440൪໨͸ిࢠͷ৔߹ 7 GeV, ϛϡʔΦϯͷ৔߹ 6 GeV ·Ͱ∑ weights - fitted bkg

20Լ͛ͯղੳΛߦͬͨɻ

0

4 ͭͷϨϓτϯ͔Β࠶ߏ੒͢Δώοάεཻࢠͷෆม࣭ྔ (m4ℓ ) ෼෍ͷ෼ղೳΛ޲্ͤ͞ΔͨΊ, mH <1050

190 GeV ͷ৔߹͸, Ұ൪໨ͷ Z ϘιϯϖΞʹରͯ͠ Z

-5

110

120

130

140

150

160

m γ γ [GeV]ਤ 4: H→ γγ ʹ͓͚Δ΢ΣΠτ෇͖ͷ mγγ ෼෍ [6]ɻ7 TeV ͱ 8 TeV ͷσʔλ͔Β 2 ͭͷޫࢠΛબ୒ͯ͠,ͦͷෆม࣭ྔΛ૊Ήͱਤ 4 ͕ಘΒΕΔɻ105 < mγγ <160 GeV ͷྖҬʹ 111791 Πϕϯτ͕‫؍‬ଌ͞Εͨ [6]ɻ‫؍‬
ଌσʔλΛ‫׈‬Β͔ͳؔ਺ͰϑΟοτ͢Δ͜ͱͰ‫ੵݟ‬΋ͬͨόοΫάϥ΢ϯυʹରͯ͠, 126 GeV ෇ۙʹ໌Β͔ͳΠϕϯτ௒աΛ֬ೝ͢Δ͜ͱ͕Ͱ͖Δɻৄࡉ͸ল͕͘, ΠϕϯτΛ 12 ‫ݸ‬ͷΧςΰϦʹ෼ྨ͠
ͨɻ·ͣ VBF, V H, tt̄H աఔͷͨΊͷΧςΰϦΛ߹‫ ܭ‬8‫ݸ‬ఆٛ͠, ࢒ͬͨΠϕϯτΛ S/B ͷҟͳΔ 4 ͭʹ෼ྨ͠
ͨɻlocal p0 ͸ΧςΰϦΛઃ͚ͳ͍৔߹ͱൺֱͯ͠༗ҙ౓Ͱ 20%ఔ౓վળ͢Δɻ͜ͷΑ͏ͳํ๏ͰධՁͨ͠Πϕϯτ௒ա͸ 125.4 GeV Ͱ 5.2σ(‫ظ‬଴஋ 4.6σ) Ͱ, γάφϧ+0.12
ͷ‫͞ڧ‬͸ µ = 1.17±0.23(stat.)+0.10−0.08 (syst.)−0.08 (theory)Ͱ͋ͬͨɻµ ஋ [15] ͕খ͘͞ͳͬͨཁҼ͸, ޫࢠͷΤωϧΪʔֱਖ਼ͷվળ, Πϕϯτͷબ୒৚݅ͱΧςΰϦͷม
ߋͰ͋ΔɻಛʹΤωϧΪʔֱਖ਼Λվળͨ͜͠ͱͰ, σʔ
6 ਖ਼֬ʹ͸, |η| <1.37, |η| >1.82 ͷޫࢠʹ͍ͭͯ͸ 0.2-0.3%Ͱ,1.52< |η| <1.82 ʹ͍ͭͯ͸ίϯόʔδϣϯ͠ͳ͔ͬͨޫࢠ͸ 0.9%,ίϯόʔδϣϯͨ͠ޫࢠ͸ 0.4%Ͱ͋ͬͨɻ

Ϙιϯͷ࣭ྔϐʔΫΛ࠶‫͢ݱ‬ΔΑ͏ʹೋͭͷϨϓτϯͷ
ӡಈྔΛ࠶‫͢ࢉܭ‬Δ (Z-mass constraint fit)ɻ190 GeVΑΓॏ͍ώοάεཻࢠΛ୳ࡧ͢Δ৔߹͸, ྆ํͷ Z Ϙιϯʹ Z-mass constraint fit Λߦ͏ɻ125 GeV ͷ৔߹ͷ࣭ྔ෼ղೳ͸ 1.6 GeV (4µ), 1.8 GeV (2e2µ), 2.2 GeV (4e)Ͱ͋Δɻਤ 5 ͸ 4 ͭͷϨϓτϯ͔Β࠶ߏ੒͞Εͨෆม࣭ྔ෼෍Ͱ, 125 GeV ෇ۙʹ໌Β͔ͳϐʔΫ͕‫͑ݟ‬Δɻ݁Ռ [7] ͸ΠϕϯτΛ VBF-tag, 2 ͭͷ V H-tag, ࢒Γ(ggF-tag) ͷ 4 ͭͷΧςΰϦʹ෼ྨͯ͠ධՁͨ͠ɻ120 <m4ℓ < 130 GeV ʹ࢒ͬͨΠϕϯτ͸ 37 ΠϕϯτͰ,
VBF-tag ʹ 3 Πϕϯτ, ࢒Γ 34 ͸͢΂ͯ ggF-tag Ͱ͋ͬͨɻΠϕϯτ௒ա͸ 125.36 GeV Ͱ 8.1σ (‫ظ‬଴஋ 6.2σ)+0.21
Ͱ, γάφϧͷ‫͞ڧ‬͸ µ = 1.44+0.34−0.31 (stat.)−0.11 (syst.)Ͱ͋ͬͨɻ·ͨ, ਤ 6 ͸ ggF ʹର͢Δ VBF Β͠͞Λධ
Ձ͢Δ BDT ͷ෼෍Ͱ 0.7 ෇ۙʹ VBF Β͍͠Πϕϯτ͕ 1 ͭ (m4ℓ =123.4 GeV) ֬ೝͰ͖ͨɻ

4.3

H → W W (∗) → ℓνℓν νϟϯωϧ

ऴঢ়ଶʹ 2 ͭͷχϡʔτϦϊΛ‫ؚ‬ΉνϟϯωϧͰ͋ΔɻχϡʔτϦϊ͸ΘΕΘΕͷ‫ݕ‬ग़‫Ͱث‬͸௚઀‫؍‬ଌͰ͖ͳ͍͕, ϏʔϜ࣠ʹରͯ͠ԣํ޲ͷΤωϧΪʔ͸อଘ͢Δ͜ͱ͕෼͔͍ͬͯΔͷͰ, ‫ݕ‬ग़‫؍Ͱث‬ଌͨ͠΋

5
249

ATLAS

35

Data
Signal (m = 125 GeV µ = 1.51)

H → ZZ* → 4l

H

∫ Ldt = 4.5 fb
s = 8 TeV ∫ Ldt = 20.3 fb

30

s = 7 TeV

25

Events / bin

Events / 2.5 GeV

× 10

Background ZZ*-1

Background Z+jets, t t-1

Systematic uncertainty

40

ATLAS H →WW*

3

ATLAS

(a) All jets, ee/ µµs = 8 TeV, 20.3fb-1

Obs ± stat
Exp ± syst

20
nj

20
0
30
Events / bin

15
10
5

(b) All jets, e µ

DY
Top
WW
Misid
VV
Higgs

(c) b jets, e µ

20
10

0
80 90 100 110 120 130 140 150 160 170m4l [GeV]ਤ 5: H→ ZZ (∗) → 4ℓ ʹ͓͚Δ m4ℓ ෼෍ [7]ɻEvents / 0.1-1

8 TeV, 20.3 fb

ATLAS

103

ਤ 7: H→ W W (∗) → ℓνℓν ղੳʹ͓͚ΔδΣοτ਺෼
෍ [8]ɻnj ͸δΣοτ਺Ͱɺnb ͸ͦͷதͰ΋ b-tag ͞Ε

mH=125 GeV

H → ZZ* → 4l

10

∫Ldt = 4.5 fb
s = 8 TeV ∫Ldt = 20.3 fb-1

10

VBF enriched category
110 < m4l [GeV] < 1402

0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7njnbͨδΣοτͷ਺Ͱ͋Δɻ

4

10

0

-1

s = 7 TeV

Data
ggF
VBF
VH
ZZ*
Z+jets, tt
Systematic uncertainty

ͨͨΊ, ِ෺ͷফࣦԣΤωϧΪʔͷཧղʹ͕͔͔࣌ؒͬ
͕ͨ, ʮαϚϦʔʯ࿦จ [8] ʹ͸ؒʹ߹ͬͨɻ͜ͷνϟϯωϧͷώοάεཻࢠΛั·͑ΔͨΊʹ͸ిࢠ, ϛϡʔΦϯ, ͦͯ͠େ͖ͳফࣦԣΤωϧΪʔΛ࣋ͭࣄ

1৅Λબ୒͢Δɻඪ४ཧ࿦ͷώοάεཻࢠ͸εϐϯ͕ 0 ͷ-1

ͨΊ, W Ϙιϯ͔Βੜ͡ΔిࢠͱϛϡʔΦϯ (χϡʔτϦ

10ϊ΋ϨϓτϯͰ͋Δ͕͜ͷ 2 ͭʹରͯ͠Ϩϓτϯͱ͍͏

10-2‫ݴ‬༿Λ࢖͏) ͷӡಈྔ͸ಉ͡ํ޲ʹͳΔɻͦͷͨΊ, 2 ͭ-3ͷϨϓτϯͷԣӡಈྔํ޲ͷ֯౓΍ෆม࣭ྔ͕খ͍͜͞

10

-1

-0.6

-0.2

0.2

0.6

1

BDTVBF output
ਤ 6: 110 < m4ℓ < 140 GeV ʹ͓͚Δ ggF ʹର͢Δ

VBF Β͠͞ΛධՁ͢Δ BDT ෼෍ [7]ɻͷͷ (ԣ) ΤωϧΪʔ࿨ʹ‫߸ූٯ‬Λֻ͚ͯ‫ٻ‬ΊΔɻ͜ΕΛফࣦԣΤωϧΪʔͱ͍͏ɻW Ϙιϯͷ่յϞʔυ͔Β, W W (∗) → eνµν (“eµ” νϟϯωϧ), eνeν (“ee”),µνµν (“µµ”) ͷ 3 ύλʔϯ͋Δɻ࣮ࡍͷղੳͰ͸, όοΫάϥ΢ϯυͷ‫ݯى‬ͷҧ͍͔ΒҰͭ໨͸ eµ ͱ µe (pT ͷେ͖͍ॱ) ͷΑ͏ʹผͳνϟϯωϧͱͯ͠ѻͬͨɻͱΛཁ‫͢ٻ‬Δɻ·ͨ, ෇ਵ͢ΔδΣοτͷ਺ 0-jet, 1-jet,≥2-jet Λ༻͍ͯΧςΰϦΛઃఆ͢Δɻਤ 7 ͸֤νϟϯωϧͷδΣοτ਺෼෍Ͱ͋Δ͕, δΣοτͷ਺ʹΑͬͯόοΫάϥ΢ϯυͷ੒෼͕ҟͳΔ͜ͱ͕෼͔Δɻ0-jet Ͱ͸
W W ͕ओͳόοΫάϥ΢ϯυͰ͋Δ͕, δΣοτ਺͕૿͑Δͱ tt̄ ͕૿͑ͯ͘Δɻ·ͨ, ≥2-jet ΧςΰϦ͸ VBFϓϩηεʹಛԽͨ͠ΧςΰϦ (VBF ΧςΰϦ) ͱͦΕҎ
֎ (≥2-jet ggF ΧςΰϦ) ʹ෼͚ͯղੳΛߦͬͨɻχϡʔτϦϊͷଘࡏͷͨΊ, ώοάεཻࢠͷ࣭ྔΛ࠶ߏ੒͢Δ͜ͱ͕Ͱ͖ͳ͍ɻͦͷͨΊ, ώοάεཻࢠͷ࣭ྔͱ૬ؔͷ͋Δԣ࣭ྔ mT ͱ͍͏ม਺Λಋೖ͢Δ͕, ͜Ε͸ mγγ ΍ m4ℓ ΄Ͳͷ࣭ྔ෼ղೳΛ࣋ͨͳ͍ɻਤ 8 ͸ൃ‫ݟ‬࿦จ [1] Ͱ͸, 8 TeV σʔλʹ͍ͭͯ͸ W W (∗) →eµ/µe ͷΈͳΒͣ ee ΍ µµ Λ‫ؚ‬Ίͨ 0/1-jet ΧςΰϦͷ mT ෼෍Ͱ͋Δɻγάφϧ͸͸͖ͬΓͱͨ͠ϐʔΫ

eµ/µe νϟϯωϧ͔ΒಘΒΕΔ্ʹ, ee ͱ µµ νϟϯωϧ͸ղੳʹ࣌ؒΛཁ͢Δ͔ΒͰ͋ͬͨɻ࣮ࡍ, ee ͱ µµϥ΢ϯυΑΓଟ͍͜ͱ͕෼͔Δɻ࣮ࡍ, ‫ੵݟ‬΋ͬͨόοeνµν ͷΈΛղੳ͕ͨ͠, ͜Ε͸ൃ‫౓ײݟ‬શମͷ໿ 85%͸νϟϯωϧͰ͸ফࣦԣΤωϧΪʔͷ෼ղೳͷͨΊِ෺ͷফࣦԣΤωϧΪʔ͕ੜͨ͡৔߹, Z/γ (∗) → ee/µµ ϓϩηε͕໽հͳόοΫάϥ΢ϯυʹͳΔɻ2012 ೥͸ύΠϧΞοϓ͕૿͑ͨͨΊফࣦԣΤωϧΪʔͷ෼ղೳ͕ѱԽ͠Λ࡞Βͳ͍͕, ‫؍‬ଌͨ͠Πϕϯτ͕‫ظ‬଴͞ΕΔόοάά
Ϋάϥ΢ϯυΛҾ͍ͨ݁Ռ͕ಉਤͷԼͰ, Πϕϯτ௒ա͕֬ೝͰ͖Δɻ125.36 GeV ͰͷΠϕϯτ௒ա͸ 6.1σ(‫ظ‬଴஋ 5.8σ) Ͱ͋Δ [8]ɻγάφϧͷ‫͞ڧ‬͸ 125.36ĠeV Ͱ+0.17µ = 1.09+0.16−0.15 (stat.)−0.14 (syst.) Ͱ͋ͬͨɻ

6

ATLAS H →WW*800

s =8 TeV, 20.3 fb-1
s =7 TeV, 4.5 fb-1(a) n j ≤ 1, e µ+ee/ µµ
Obs ± stat
Bkg ± syst
Higgs
WW
Misid
VV
Top
DY

600
400
200

Events / bin

Events / 10 GeV

250

ATLAS

s =8 TeV, 20.3 fb-1

40

H VBF
H ggF
Top
DY
WW
Misid
VV

20

0

1

2

3

BDT bin number

0(b) Background-subtracted
Obs - Bkg
Bkg ± syst
Higgs

150

Events / 20 GeV

Events / 10 GeV

Obs ± stat
Exp ± syst

100
50

Obs ± stat
Exp ± syst

ATLAS

s =8 TeV, 20.3 fb-1

20

H VBF
H ggF
Top
DY
WW
Misid
VV

10

0

0
50

100

150

200

250

300

0

50

Ϧͷ mT ෼෍ [8]ɻԼਤ͸σʔλ͔Β‫ੵݟ‬΋ͬͨόοΫάϥ΢ϯυΛҾ͍ͨ෼෍ɻ

VBF ΧςΰϦͰ͸ BDT ͷ෼෍Λ࢖ͬͯγάφϧͱόοΫάϥ΢ϯυΛ෼཭͢Δ 7 ɻਤ 9 ͷ্ਤ͸ BDT ෼෍ΛϑΟοτͨ݁͠ՌͰ, Լਤ͸ͦͷ mT ෼෍Ͱ͋Δɻ·ͩ౷‫ܭ‬͸े෼Ͱ͸ͳ͍͕, ߴ͍ BDT ϏϯͰ VBF Β͍͠Πϕϯτͷଘࡏ͕֬ೝͰ͖Δɻ

150

m T [GeV]

m T [GeV]ਤ 8: H→ W W (∗) → ℓνℓν ղੳʹ͓͚Δ 0/1-jet Χςΰ100

ਤ 9: H→ W W (∗) → ℓνℓν ղੳʹ͓͚Δ VBF ΧςΰϦ(eµ/µe νϟϯωϧ) ͷ BDT(্) ͱͦͷ mT ෼෍ (Լ) [8]ɻཻࢠͱͦͷ่յ͔Βੜ͡ΔχϡʔτϦϊͷӡಈྔͷํ޲͕ൺֱతಉ͡ํ޲Λ޲͘ͱ͍͏ੑ࣭Λ࣋ͭɻͦͷͨΊ, ‫׬‬શʹಉ͡ํ޲ʹͳΔͱԾఆ͢Δͱ, ଌఆͨ͠ফࣦ
ԣΤωϧΪʔ (2 ੒෼) ͔Β֤λ΢ཻࢠʹׂΓ౰ͯΒΕΔ
χϡʔτϦϊ੒෼ͷେ͖͞ (2 ‫ܾ͕ )ݸ‬ఆͰ͖Δɻ͜ΕΛʮCollinear ۙࣅʹΑΔ࣭ྔͷ࠶ߏ੒ʯͱ‫Ϳݺ‬ɻATLAS ࣮‫ݧ‬΍ CMS ࣮‫Ͱݧ‬͸͜ΕΛൃల࣭ͤͨ͞ྔ࠶ߏ੒ํ๏Λ։ൃ͠, ATLAS Ͱ͸ʮMMCʯ (Missing mass calculator)

4.4

H → τ τ νϟϯωϧ

VBF ϓϩηεʹ‫౓ײ‬ͷ͋ΔνϟϯωϧͰ, ࣮‫ݧ‬։࢝લ͔ΒʮVBF H→ τ τ ͷ୳ࡧʯͷΑ͏ʹ VBF աఔͷԼͰ‫͕ڀݚ‬ਐΜͰ͖ͨνϟϯωϧͰ͋Δɻώοάεཻࢠ͕ΫΥʔΫͷΈͳΒͣϨϓτϯͱ΋݁߹͢Δ͜ͱΛ֬ೝ
͢ΔͨΊʹॏཁͳղੳνϟϯωϧͰ͋Δɻλ΢ཻࢠ͸τ → ℓνℓ ντ ͷΑ͏ͳϨϓτχοΫ่յͱ τ → πντ ͷΑ͏ʹ π ± /π 0 Λ‫ؚ‬ΉϋυϩχοΫ่յΛߦ͏ͨΊ, ղੳνϟϯωϧ͸େ͖͘෼͚ͯ 3 ͭ͋Γ, ͦΕͧΕ ℓℓ, ℓτhad ,τhad τhad ͱ‫Ϳݺ‬ɻ
W W (∗) ͷΑ͏ʹऴঢ়ଶʹχϡʔτϦϊΛ‫ؚ‬ΉͷͰώοάεཻࢠͷ࣭ྔͷ࠶ߏ੒͸Ͱ͖ͳ͍ͱߟ͑ͯ͠·͏͕,࣍ͷΑ͏ͳཧ༝ͰՄೳͱͳΔɻVBF ͳͲͷΑ͏ʹώοάεཻࢠ͕ൺֱతେ͖ͳԣӡಈྔΛ࣋ͭ৔߹, ͦͷ่յͱ‫ݺ‬͹ΕΔํ๏ 8 Λ༻͍ͨ݁ՌΛώοάεཻࢠͷ࣭ྔmMMCͱͯ͠༻͍͍ͯΔɻττ
125 GeV ෇ۙͷώοάεཻࢠͷγάφϧ͸ಉ่͡յϞʔυΛ࣋ͭஅ໘ੵͷେ͖͍ Z Ϙιϯ (mZ =91 GeV) ͷ࣭ྔ෼෍ͷϐʔΫͷӈଆͷ੄ʹ৐ͬͨ‫ͳʹܗ‬Δ্, MMC
Λ࢖ͬͨ৔߹Ͱ΋৴߸ྖҬͰͷ࣭ྔ෼ղೳ͸ 25%ఔ౓ͷͨΊ, ෼཭ೳྗ͸ͦΕ΄ͲΑ͘ͳ͍ɻ͕ͨͬͯ͠, Z Ϙιϯ, ಛʹෳ਺ͷδΣοτΛ൐͏ Z Ϙιϯաఔ (Z+jets)ͷ Z Ϙιϯͷ࣭ྔ෼෍Λਖ਼͘͠‫ੵݟ‬Δ͜ͱ͸͜ͷղੳͰඇৗʹॏཁͰ͋ΔɻͦͷͨΊ, ࣮σʔλͷ Z → µµ ࣄ৅Ͱ µ Λ τ Ͱஔ͖‫͑׵‬, λ΢ཻࢠͷ่յͳͲ͸γϛϡϨʔγϣϯΛ༻͍ͯ τ ෦෼Ҏ֎ͷ Z+jets ͷΠϕϯττϙϩ
δʔ͸σʔλ͔Β‫ੵݟ‬΋Δ embedding ํ๏Λ։ൃͨ͠ɻ
ਤ 10 ͸ MC σʔλͰͷ࠶‫ݱ‬ੑͷνΣοΫͰ͜ͷख๏͕ద੾Ͱ͋Δ͜ͱ͕෼͔Δɻ

͔Βੜ͡Δλ΢ཻࢠ΋େ͖ͳԣӡಈྔΛ࣋ͭͨΊ, λ΢
8 େࡶ೺ʹ͍͑͹ʮ‫׬‬શʹಉ͡ํ޲ʯͱ͍͏৚݅Λʮ͋Δ෼෍ʹैͬ
7 ͦΕҎ֎ͷΧςΰϦͰ͸ m

T ෼෍Λ༻͍Δɻ

ͨํ޲ʯͷΑ͏ʹ෯Λ࣋ͨͤΔ͜ͱͰ, ΑΓਖ਼͍࣭͠ྔΛ‫͢ࢉܭ‬Δɻ

7

0.16

µτhad + eτhad
MC

0.14
0.12

MC Stat. Error

0.1

Embedded MC
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0.08

Events / 0.17

Arbitrary Units251

ATLAS Simulation

0.06

104
103

µτhad + e τhad VBF

Data
H (125) (µ=1.4)
H (125) (µ=1)
Z → ττ
OthersFake τ
Uncert.

s = 8 TeV, 20.3 fb-1
ATLAS

102

0.04

10

0
1.260
1.1
1
0.9
0.8
60

80

100

120

140

160

180

MMC [GeV]

80

100

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[GeV]
ττ

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Emb. / MC

0.02

-1
1.5
1
0.5

-0.5

-1

-0.5

0

0.5

1

BDT output

0

0.5
1
BDT output

ਤ 10: Embedding ํ๏Λ֬ೝ͢ΔͨΊͷ mMMC෼ττ

ਤ 11: VBF ΧςΰϦͷ ℓτhad νϟϯωϧͷ BDT ग़ྗ

෍ [9]ɻനൈ͖͕ Z → τ τ , ࠇ͕ Z → µµ ʹ embeding ํ෼෍ [9]ɻ

๏Λద༻ͯ͠‫ٻ‬Ίͨ Z → τ τ ͷ෼෍ɻ֤νϟϯωϧͰ VBF աఔ༻ͷΧςΰϦͱ Boost Χς

ΔɻZ → ν ν̄ ͷͨΊͷ 0-lepton ղੳ, W → ℓν ͷͨΊͷ 1-lepton ղੳ, Z → ℓℓ ͷͨΊͷ 2-lepton ղੳͰ͋ΰϦ (ggF աఔ͕ओͰ͋Δ͕, ώοάεཻࢠ͕ߴ͍ pT ΛΔɻ͜ͷղੳͰ͸ήʔδϘιϯͷԣӡಈྔ pVT ͕ߴ͍Π࣋ͭ͜ͱΛཁ‫͢ٻ‬ΔͨΊ, όοΫάϥ΢ϯυ͕ൺֱత཈

ϕϯτΛੵ‫ۃ‬తʹ༻͍ͨɻ͜Ε͸ߴ͍ pVT Λ࣋ͭΠϕϯ͑ΒΕΔ) Λઃ͚, ͦ͜Ͱ BDT Λ༻͍Δ͜ͱͰ 125 GeV

τ͸ multi-jets աఔͳͲͷόοΫάϥ΢ϯυ͕গͳ͍ͨ

ώοάεʹରͯ͠‫౓ײ‬Λ޲্ͤͨ͞ɻVBF ΧςΰϦͰΊ S/B ൺ͕Α͍͔ΒͰ͋Δɻ͸ VBF ϓϩηεͷ৴߸ʹରͯ͠, Boost ΧςΰϦͰ͸όοΫάϥ΢ϯυͷ‫ੵݟ‬Γ͕ඇৗʹ೉͍ͨ͠Ί, Φʔ

ggF, VBF ͳͲ͢΂ͯͷγάφϧաఔʹରͯ͠όοΫάϥ΢ϯυͱ‫ ʹڞ‬BDT ͷτϨʔχϯάΛߦͬͨɻਤ 11 ͸ιυοΫεͳղੳํ๏ (Cut-based) ͱΞυόϯεͳղੳℓτhad ͷ BDT ෼෍Ͱେ͖ͳ BDT ஋Λ࣋ͭγάφϧ͸
όοΫάϥ΢ϯυ͔Β෼཭Ͱ͖Δ͜ͱ͕෼͔Δɻਤ 12 ͸ղੳͰ͸ pVT , δΣοτͷ਺, b-jet Β͠͞Λ࢖ͬͯΧςΰϦΛઃఆͯͦ͠ͷதͰ 2 ͭͷ b-jet ͔Β૊Ή࣭ྔ (mbb )mMMC
෼෍Ͱ, 125 GeV ෇ۙͰΠϕϯτ௒աΛ֬ೝ͢Δττ৘ใΛ࢖ͬͯ, γάφϧͱόοΫάϥ΢ϯυΛ۠ผ͢Δɻ

͜ͱ͕Ͱ͖Δɻઌʹड़΂ͨΑ͏ʹ෯ͷ޿͍γάφϧͷ෼ҰํɺMVA ղੳͰ͸ΑΓ‫౓ײ‬Λ্͛ΔͨΊʹ, ‫ج‬ຊత෍͸ Z → τ τ ͳͲͷόοΫάϥ΢ϯυͷ্ʹ৐ͬͨ‫Ͱܗ‬,ʹ͸ pVT ʹΑΔΧςΰϦΛͳ͘͠ mbb ΍ pVT ΋‫ؚ‬Ίͯ͞ख๏ (MVA) ͷ 2 ͭΛฏߦͯ͠ਐΊͨ [10]ɻCut-basedόοΫάϥ΢ϯυ͕͖ͪΜͱ‫ੵݟ‬΋Εͳ͍ͱ۠ผ͕Ͱ͖

·͟·ͳม਺ (࠷େ 11 ‫ )ݸ‬Λ BDT ͷೖྗͱͯ͠༻͍ͨɻ

ͳ͍͜ͱ͕෼͔ΔɻಉਤͷԼͷਤ͸, ‫ੵݟ‬΋ͬͨόοΫάલऀͰͷ༗ҙ౓ͷ‫ظ‬଴஋͸ 1.9σ Ͱ͋Δ͕, ‫ऀޙ‬Λ࠾༻͢ϥ΢ϯυΛҾ͍ͨ΋ͷͰ, ΑΓ͸͖ͬΓͱΠϕϯτ௒աΔͱ 2.5σ(8TeV σʔλͷΈͷൺֱ) ·Ͱվળ͢ΔͨΊ,Λ֬ೝͰ͖Δɻ125.36 GeV ͰͷΠϕϯτ௒ա͸ 4.5σ(‫ظ‬

MVA ղੳΛϝΠϯͷղੳख๏ͱͯ͠࠾༻͠, Cut-based

଴஋ 3.4σ) Ͱ͋Δ [9]ɻ͜Ε͸ώοάεཻࢠ͕Ϙιϯ΍ղੳ͸֬ೝ༻ͱͨ͠ɻ

ΫΥʔΫ͚ͩͰͳ͘ඪ४ཧ࿦͕༧‫͢ݴ‬Δ௨Γλ΢ཻࢠʹ

mbb ͷ෼ղೳΛվળ͢ΔͨΊ, b-jet தͷϛϡʔΦϯͷ΋݁߹͢Δ͜ͱͷ‫͋Ͱڌূ͍ڧ‬Δɻ·ͨ, γάφϧͷ‫ڧ‬ิਖ਼Λߦͬͨɻ·ͨ, 2-lepton ղੳͰ͸ Z ͱ H ͷԣӡ+0.32͞͸ µ = 1.43+0.27−0.26 (stat.)−0.25 (syst.)±0.09(theory) Ͱ,ಈྔͷόϥϯεΛ༻͍ͨ kinematic fit Λߦ͏͜ͱͰਤ

ඪ४ཧ࿦ΑΓ͸ए‫ׯ‬େ͖͍͕‫ࠩޡ‬΋େ͖͍ͨΊ, ·ͩ·ͩ౷‫ܭ‬ͷඞཁͳνϟϯωϧͰ͋Δɻ

4.5

V H, H→ bb̄ νϟϯωϧ

13 ʹࣔ͢Α͏ʹେ෯ʹ mbb ͷ෼ղೳΛվળͨ͠ɻ
ਤ 14 ͸ 2-lepton ղੳͰ pVT > 120 GeV ͷΧςΰϦͷ BDT ෼෍Ͱ, ߴ͍ BDT ʹए‫ׯ‬ͷΠϕϯτ௒ա͕‫ݟ‬ΒΕΔɻਤ 15 ͸ Cut-based ղੳͰಘͨ mbb
෼෍Ͱ, 120 GeV ෇ۙʹए‫ׯ‬ͷΠϕϯτ௒ա͕‫ݟ‬ΒώοάεཻࢠͱϘτϜΫΥʔΫ (μ΢ϯ‫ܕ‬ΫΥʔΫ)

ΕΔɻMVA ղੳʹ͓͚ΔόοΫάϥ΢ϯυ͔ΒͷΠͷ݁߹Λ‫͢ূݕ‬ΔͨΊʹॏཁͳνϟϯωϧͰ͋ΔɻV H

ϕϯτ௒ա͸ 1.4σ (‫ظ‬଴஋ 2.6σ) Ͱ, µ = 0.52 ±ͷ V ͷ่յͷ࢓ํʹΑͬͯ, 3 ͭͷղੳνϟϯωϧ͕͋0.32(stat.)±0.24(syst.)(125.36 GeV) Ͱ͋ͬͨɻ·ͨ, ղ8

H→ ττ VBF+Boosted

60

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p V >120 GeV-1T

Data 2012
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Dibosontt
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21 0 8 0 6 0 4 0 2
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BDTVHਤ 14: 2-lepton νϟϯωϧ, pVT > 120 GeV ΧςΰϦͷ

Ϋάϥ΢ϯυΛσʔλ͔ΒҾ͍ͨ৔߹ͷ෼෍ [9]ɻBDT ෼෍ [10]ɻ

Events / 4.0 GeV

ਤ 12: ΢ΣΠτ෇͖ͷ mMMC
෼෍ɻԼ͸‫ੵݟ‬΋ͬͨόοττATLAS Simulation

Resolutions

0.1 Pythia VH, H → bb MC
0.08

2 lep., 2 jets, 2 b-tags
p V inclusive(σGSC-σ)/ σGSC

16.4 GeV--

11.4 GeV30%• ඍ෼அ໘ੵ: H→ γγ [18] ͱ H→ ZZ (∗) → 4ℓ [19](ʮେαϚϦʔʯ࿦จ͸४උத)

T

0.06
0.04

• “Fiducial” ͋Δ͍͸ “inclusve” அ໘ੵ: H→ bb̄ Ҏ֎ͷղੳνϟϯωϧ

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180 200
mbb [GeV]ਤ 13: V H, H→ bb̄ ͷ 2-lepton ղੳʹ͓͚Δγάφϧͷ

mbb ෼෍ [10]ɻ࣭ྔ࣭ ྔ ෼ ղ ೳ ͕ ྑ ͍ H→ γγ ͱ H→ ZZ (∗) → 4ℓ

νϟϯ ω ϧ Λ ༻ ͍ ͯ ଌ ఆ ͠, ͦ Ε ͧ Ε 125.98 ±
0.42(stat.) ± 0.28(syst.) GeV, 124.51 ± 0.52(stat.) ±0.06(syst.) GeV Ͱ͋ͬͨɻ·ͨ, ͜ͷ 2 ͭͷνϟϯωϧΛ
߹ΘͤΔͱ 125.36 ± 0.37(stat.) ± 0.18(syst.) GeV Ͱ,͢Ͱʹଌఆਫ਼౓͸ 0.3%Λୡ੒͍ͯ͠Δ͜ͱ͕෼͔Δɻ͜ੳख๏ͷ֬ೝͷͻͱͭͱͯ͠ώοάεཻࢠΛ Z Ϙι

ΕΒͷ 3 ͭͷ݁ՌΛಘͨ likelihood ratio ͷৼ෣Λਤ 16ϯʹஔ͖‫طͨ͑׵‬஌ͷ V Z աఔͷଌఆ΋ߦ͍, µV Z =ʹࣔ͢ɻ࠷΋େ͖ͳ‫ܥ‬౷‫ࠩޡ‬͸ిࢠ/ޫࢠͷΤωϧΪʔ

0.74 ± 0.09(stat.)±0.14(syst.) ΛಘͨɻεέʔϧͰ͋Δɻ࣮ࡍ, ͜ΕΛվળ͢ΔͨΊ༷ʑͳ‫ڀݚ‬͕ߦΘΕ (4.1 અ), Ҏલͷ‫ܥ‬౷‫ࠩޡ‬ͷେ͖͞ͱൺֱ͢Δͱ

5

ώοάεཻࢠͷଌఆ࣭ྔ, εϐϯ/ύϦςΟ, ݁߹ఆ਺, ͓Αͼ (ඍ෼) அ໘ੵʹ͍ͭͯใࠂ͢Δɻ

໿ 3 ഒ (∼600 MeV→180 MeV) վળͨ͠ɻ·ͨ, 2 ͭͷνϟϯωϧؒͷࠩ͸ 1.47 ± 0.67(stat.)±0.28(syst.) GeV

Ͱ, ୯ಠͷώοάεཻࢠͰ͜ͷΑ͏ͳࠩΛ࡞Δ֬཰

͸ 4.8%ఔ ౓ (2σ) Ͱ ͋ Δ ɻ༗ ҙ ͳ ࠩ ͋ Δ ͍ ͸ ‫ ۮ‬વͰ͋Δ͔Λ൑அ͢Δʹ͸ΑΓଟ͘ͷσʔλ͕ඞཁ• ࣭ྔ: H→ γγ ͱ H→ ZZ (∗) → 4ℓ ͓ΑͼͦΕΒͷ
combination [16]• εϐϯ/ύϦςΟ: H→ γγ, H→ ZZ (∗) → 4ℓ ͓Αͼ
H→ W W (∗) → ℓνℓν [17] (ʮେαϚϦʔʯ࿦จ͸४උத)• ݁߹ఆ਺: ͢΂ͯͷղੳνϟϯωϧ (ʮେαϚϦʔʯ࿦จ͸४උத)Ͱ͋ΔɻͪͳΈʹ, CMS ࣮‫ݧ‬ͷ࣭ྔଌఆͷ݁ Ռ͸
+0.14
125.02+0.26−0.27 (stat.)−0.15 (syst.) GeV [20] Ͱ, ͓‫͍ޓ‬ͷ݁ՌΛ౷߹͢Δͱ 125.1 GeV લ‫Ͱޙ‬མͪண͖ͦ͏Ͱ͋Δɻ·ͨ, ࣭ྔ෼෍͔Β่յ෯ (ඪ४ཧ࿦ώοάεཻࢠͷ৔߹ 3.9 MeV) Λ௚઀ଌఆ͠, H→ γγ Ͱ 5.0 GeV (‫ظ‬଴஋

6.2 GeV), H→ ZZ (∗) → 4ℓ Ͱ 2.6 GeV (‫ظ‬଴஋ 6.2 GeV)ͷ্‫ݶ‬஋ (95%CL) Λಘͨ [16]ɻҰํ, H→ ZZ ∗ ͱ ZZ ∗

9

10
8

Normalised to unity

Weighted events after subtraction / 20.0 GeV

253

Data 2012
VH(bb) (µ=1.0)
DibosonUncertainty

ATLAS
s = 8 TeV ∫Ldt = 20.3 fb -1
0+1+2 lep., 2+3 jets, 2 tags
Weighted by Higgs S/B

60.25 ATLAS
H → ZZ* → 4l
s = 7 TeV ∫ Ldt = 4.6 fb-1
0.2
s = 8 TeV ∫ Ldt = 20.7 fb-1

Data
JP = 0+-JP = 0

0.15

4
0.1
2
0.05
0
50

100

150

200

0
-15

250

-10

-5

0

5

10

15
q

mbb [GeV]ਤ 15: ‫ੵݟ‬΋ͬͨόοΫάϥ΢ϯυΛҾ͍ͨ‫ޙ‬ͷ΢ΣΠτ෇͖ͷ mbb ෼෍ [10]ɻ

ਤ 17: H→ ZZ (∗) → 4ℓ ʹ͓͚Δ J P = 0+ ͱ 0− ʹର͢Δ likelihood ratio ෼෍ [17]ɻ

৔߹, ώοάεཻࢠ͔Βͷ௚઀ͷ่յաఔ͸ํ޲ੑΛ࣋

͚Δ͜ͱ͕Ͱ͖, 30 MeV ఔ౓ͷ্‫ݶ‬஋ [21] ΛಘͨɻͨͣҰ༷Ͱ͋Γ, H→ γγ νϟϯωϧͰ͸ώοάεཻࢠͷ-2lnΛͷ‫ׯ‬বΛར༻ͨ͠ํ๏Λ༻͍Δͱ֨ஈʹ‫ݶ੍͍͠ݫ‬Λઃ

7
6

ํ޲ʹରͯ͠ޫࢠ่͕յ͢Δ֯౓෼෍ (cos θ∗ , ਖ਼֬ʹ͸ATLAS

s = 7 TeV ∫ Ldt = 4.5 fb-1
s = 8 TeV ∫ Ldt = 20.3 fb-1

5

Collins-Soper frame ͱ͍͏‫Ͱܥ‬ͷఆٛ) Λ࢖ͬͯ͜ͷҰ༷ੑΛ֬ೝ͢ΔɻH→ ZZ (∗) → 4ℓ ΍ H→ W W (∗) → ℓνℓνCombined γ γ +4l
H → γγH → ZZ* → 4l
without systematics

νϟϯωϧͰ͸ Z ΍ W Ϙιϯ͔Β่յ͢ΔϨϓτϯΛ
2σ

4ϯωϧͰ͸ 5 ͭͷ֯౓ͱ 2 ͭͷ࣭ྔ৘ใΛ࢖ͬͯଟม਺

3ղੳΛߦ͍ͬͯΔɻH→ W W (∗) → ℓνℓν νϟϯωϧͰ͸

2εϐϯ͕ 0 ͷ৔߹, 2 ͭͷ W Ϙιϯ͔ΒͷϨϓτϯ͸ಉ

1σ

1
0

࢖ͬͯ, ֯౓ύϥϝʔλΛఆٛ͢ΔɻH→ ZZ (∗) → 4ℓ νϟ

123 123.5 124 124.5 125 125.5 126 126.5 127 127.5
mH [GeV]ਤ 16: ώοάεཻࢠ࣭ྔͷؔ਺ͱͨ͠ likelihood ra-tio [16]ɻ

͡ํ޲ʹग़΍͍͢ੑ࣭Λ࢖ͬͯ, εϐϯΛଌఆ͢Δɻ͜ΕΒͷྔࢠ਺Λ֬ೝ͢ΔͨΊ, 2 ͭͷԾఆ, ͭ·
Γ, 0+ ʹରͯ͠ 0− , 1± , 2+ 9 Λ‫ݕ‬ఆͨ͠ɻH→ γγͰ ͸ 2+ ͷ Έ, H→ ZZ (∗) → 4ℓ Ͱ ͸ 0− , 1± , 2+ ,H→ W W (∗) → ℓνℓν Ͱ͸ 1± , 2+ Λ‫ͨ͠ূݕ‬ɻ

ਤ 17 ͸ H→ ZZ (∗) → 4ℓ ʹ͓͚Δ J P = 0+ ͱ 0− ʹର͢Δ likelihood ratio ෼෍Ͱ, σʔλ͸ 0+ Λࢧ࣋͢Δ

͜ͱ͕෼͔Δɻ·ͨ, ਤ 18 ͸֤νϟϯωϧͰͷ 0+ ʹର

5.2

εϐϯͱύϦςΟ

ඪ४ཧ࿦ͷώοάεཻࢠͷεϐϯͱύϦςΟ͸ͦΕͧ
Ε 0 ͱ + (߹Θͤͯ J P = 0+ ͱॻ͘) Ͱ͋Γ, ͜ͷཻࢠ͸͢Δ΄͔ͷԾఆʹର͢Δ‫Ͱূݕ‬, 0+ ͕޷·ΕΔ͜ͱ͕
෼͔Δɻ͜ΕΒͷ݁Ռ͔Β, ࠓճൃ‫ͨ͠ݟ‬ώοάεཻࢠͷεϐϯ/ύϦςΟ͸ 0+ Ͱ͋Δ͜ͱΛ‫͍ͯࠦࣔ͘͠ڧ‬Δ͜ͱ͕෼͔ͬͨɻ

ඪ४ཧ࿦ʹ͓͍ͯ།ҰͷεΧϥʔૉཻࢠͰ͋ΔɻH→ γγνϟϯωϧ͕‫؍‬ଌ͞Ε͍ͯΔࣄ࣮ͱ Landau-Yang ఆཧ͔Β, (on-shell ͷ) εϐϯ 1 ͷཻࢠͰ͸ͳ͍ͱ݁࿦Ͱ͖
Δ͕, ࣮‫ݧ‬తʹ͸͋ΒΏΔՄೳੑΛ‫͢ূݕ‬Δ͜ͱ͸ॏཁ
Ͱ͋Δɻεϐϯ΍ύϦςΟΛ‫͢ূݕ‬ΔͨΊʹώοάεཻࢠͷ่յ͔Βੜཻͨ͡ࢠ (௚઀͋Δ͍͸ΧεέʔυͰ) ͷ֯౓෼෍ͳͲͷӡಈֶతͳύϥϝʔλΛ༻͍Δɻεϐϯ͕ 0 ͷ

5.3

݁߹ͷ‫͞ڧ‬݁߹ఆ਺͸ඪ४ཧ࿦Ͱ‫ظ‬଴͞ΕΔ‫͞ڧ‬Λ‫ج‬४ʹଌఆ͢
Δɻͨͱ͑͹, ώοάεཻࢠͱτοϓΫΥʔΫͷ݁߹͸ʮκt × ඪ४ཧ࿦ͷ஋ʯͰ κt Λଌఆ͢Δɻ͜Ε͕ 1 ͳΒඪ
9 εϐϯ 2 ʹ͍ͭͯ͸༷ʑͳϞσϧ͕ଘࡏ͢Δ͕, ͜͜Ͱ͸ॏྗࢠ (εϐϯ 2) ͷཧ࿦Λϕʔεͱͨ͠ϞσϧͷதͰ࠷খͳ݁߹ఆ਺Ͱ
‫ه‬ड़Ͱ͖ΔಛఆͷϞσϧΛ࠾༻ͨ͠ɻ

10
254

ද 2: ֤ղੳνϟϯωϧͰଌఆͨ͠ੜ੒ϓϩηεຖͷATLASµ [6, 7, 8, 9]ɻ“-” ͸ղੳͰߟྀ͍ͯ͠ͳ͍͜ͱΛࣔ͢ɻData

H → γγs = 8 TeV ∫ Ldt = 20.7 fb-1

CLs expectedassuming J P = 0 +H → ZZ* → 4l
s = 7 TeV ∫ Ldt = 4.6 fb

H→ γγ
H→ ZZ ∗
H→ W W ∗H→ τ τ

-1± 1σ

s = 8 TeV ∫ Ldt = 20.7 fb-1

µggF
1.32 ± 0.38
1.7+0.5−0.4
1.02+0.29
−0.26
+1.5
2.0−1.2µVBF
0.8 ± 0.7
0.3+1.6−0.9
1.27+0.53−0.45
1.24+0.59
−0.57

µW H
1.0 ± 1.6
µVBF
µVBF
µVBF

µZH
0.1+3.7
−0.1
µVBF
µVBF
µVBF

µtt̄H
1.6+2.7
−1.8
µggF
-

alt

CLs ( J P )H → WW* → eνµν/ µνeν1

s = 8 TeV ∫ Ldt = 20.7 fb-1

1σ

10-1

2σ

10-2

৺஋͚ͩ‫ݟ‬Δͱʮͼͬ͘Γʯ(?) ͢ΔΑ͏ͳ஋ʹͳͬͯ
͍Δɻ

3σ

10-3
10-4

4σ

ATLAS Prelim.

σ(stat.)mH = 125.36 GeVσ(theory )Total uncertainty±1σ on µsys inc.

Phys. Rev. D 90, 112015 (2014)

10-5
10-6

0.09(stat.)±0.07(syst.)+0.08−0.07 (theory) [20] Ͱ͋ͬͨɻத

H → γγ+ 0.23- 0.23µ = 1.17+-0.27
0.27 - 0.11

+ 0.16

P

J =0

-

P

+

J =1

P

-

J =1

J

P

= 2 +marXiv:1408.5191

H → ZZ* → 4l

+ 0.34- 0.31µ = 1.44+-0.40
0.33 - 0.11

+ 0.21

ਤ 18: J P = 0+ ʹର͢Δͦͷ΄͔ͷԾఆʹର͢Δ‫ূݕ‬arXiv:1412.2641

H → WW* → lνlν݁Ռ (CLS ) [17]ɻ͜ͷ݁Ռ͸ 2013 ೥ 7 ݄·Ͱͷ੒ՌͰɺRun 1 ͷʮେαϚϦʔʯ͸‫ࡏݱ‬४උதͰ͋Δɻ

+ 0.16- 0.15µ = 1.09+-0.23
0.21 - 0.14
+ 0.17

arXiv:1409.6212

W,Z H → bb४ཧ࿦௨ΓͰ͋Δɻͨͩ͠, Run 1 Ͱ͸‫ݸ‬ʑͷ݁߹ΛଌఆͰ͖Δ΄Ͳ౷‫͕ܭ‬ଟ͘ͳ͍ͷͰ༷ʑͳԾఆΛಋೖͯ݁͠߹ఆ਺Λ‫ٻ‬ΊΔɻ·ͨ, κt ͷΑ͏ʹ֤ૉཻࢠʹର͢Δ

+ 0.3
- 0.3

µ = 0.5+-0.4
0.4 - 0.2
+ 0.2

ATLAS-CONF-2014-061

H → ττ

݁߹ఆ਺Ͱ͸ͳ͘, ·ͣ͸ෳ਺ͷޮՌΛ‫ؚ‬Ίͨʮγάφ

+ 0.3
- 0.3

µ = 1.4+-0.4
0.4 - 0.3
+ 0.3

ϧͷ‫͞ڧ‬ʯµ ͷ݁ՌΛ·ͱΊΔɻʮෳ਺ͷޮՌʯͱ͍͏
ҙຯ͸ͨͱ͑͹ ggF աఔͰͷ H→ γγ ͷ৔߹, ओʹੜ੒s = 7 TeV ∫ Ldt = 4.5-4.7 fb-1

ଆʹ͸τοϓΫΥʔΫ (κt ), ่յଆʹ͸ W Ϙιϯ (κW )s = 8 TeV ∫ Ldt = 20.3 fb-1

ͱτοϓΫΥʔΫ (κt ) ͷޮՌ͕ೖ͍ͬͯΔɻ

0

0.5

1

1.5

2

Signal strength (µ)
released 12.01.2015

ਤ 19: ֤ղੳνϟϯωϧͷ µ ஋ [6, 7, 8, 9, 10]

1 ষͰઆ໌ͨ͠Α͏ʹ‫ݸ‬ʑͷղੳνϟϯωϧͷ݁Ռ͸
ग़ͦΖͬͨ΋ͷͷ, ͦΕΛ౷‫ܭ‬తʹ౷߹ͨ݁͠Ռʹ͍ͭͯ͸ຊߘΛॻ͍͍ͯΔ࣌఺Ͱ͸ެ։Ͱ͖ͳ͔ͬͨɻH→ γγͷ µ ஋ͷத৺஋͕ए‫ׯ‬খ͍͞ํ޲ʹಈ͍ͨͨΊ, ຊߘͰ͸͙͢ʹ obsolete ʹͳΔͰ͋Ζ͏Ҏલͷ݁Ռ [15] Λ͓

5.3.2

ੜ੒ϓϩηεຖͷγάφϧͷ‫͞ڧ‬ղੳνϟϯωϧຖʹੜ੒ϓϩηεʹ෼ྨͯ͠‫ٻ‬Ίͨ µ
Λද 2 ʹ·ͱΊΔɻH→ γγ ͸ൺֱత౷‫਺ܭ‬΋ଟ͘, ͔ͭ,͞Β͍͢Δ͜ͱ͸߇͑Δ͜ͱʹ͢Δɻ

֤ੜ੒ϓϩηεʹಛԽͨ͠ΧςΰϦΛઃ͚ͨ͜ͱ΋͋ͬ

5.3.1

ͯ, ͢΂ͯͷੜ੒ϓϩηεʹରͯ͠ µ Λ‫ٻ‬ΊͨɻµZH ʹ୯Ұͷγάφϧͷ‫ ͞ڧ‬µ͍ͭͯ͸ S + B ͷ਺͕θϩʹͳΒͳ͍Α͏ʹ‫ࠩޡ‬Λ෇ղੳνϟϯωϧຖʹ୯Ұͷ µ Ͱඪ४ཧ࿦ͱൺֱͨ͠஋

͚͍ͯΔɻ΄͔ͷղੳνϟϯωϧʹ͍ͭͯ͸, ‫ج‬ຊతʹΛਤ 19 ʹ·ͱΊΔɻ͜Ε͸͜Ε·Ͱड़΂͖ͯͨ µ ஋ͱ͸‫د‬༩ͷখ͍͞ V H ΍ tt̄H ͸ແࢹ͍ͯ͠Δ͕, ࣮ࡍͷಉ͡΋ͷͰ͋Δɻ౷‫ॲܭ‬ཧͰ͸ͦΕͧΕ VBF(ήʔδϘιϯͱͷ݁߹) ͱҰ ํ,

CMS ࣮ ‫ ݧ‬͸ Ұ ଍ ૣ ͘ Run 1 ࣮ ‫ ݧ‬ͷ ݁߹ ఆ ਺ ʹ ؔ ͢ Δʮ େ α Ϛ Ϧ ʔ ʯ࿦ จ Λ ग़ ൛ ͠ ͨ ɻ͢ ΂ ͯ ͷ νϟϯ ω ϧ Λ ߹ Θ ͤ ͨ ݁ Ռ ͸ ൴ Β ͷ ଌ ఆ͠ ͨ ࣭ ྔ ͷ 125.02 GeV ʹ ͓ ͍ ͯ µ=

1.00 ±

ggF(ϑΣϧϛΦϯͱͷ݁߹) ͱಉ͡஋ͱͯ͠૊ΈೖΕͯ
͍Δɻ

11
255

݁߹ఆ਺

dσfid / dp [fb/GeV]

5.3.3

લʹड़΂ͨΑ͏ʹ֤ૉཻࢠ i ͷ κi Λ‫ٻ‬ΊΔ΄Ͳ౷‫ܭ‬data

Φϯ (t, b, τ ͳͲ)” Ͱ෼ྨͯͦ͠ΕͧΕͰඪ४ཧ࿦͔
Βͷ݁߹ఆ਺ͷζϨ͕ಉ͡ͱԾఆ͢Δɻͭ·ΓɺϘιϯ

syst. unc.

gg →H (HRES) + X H

1(K ggF = 1.15)

T͕ͳ͍ͨΊ, ֤ૉཻࢠΛ “Ϙιϯ (W ,Z)” ͱ “ϑΣϧϛATLAS

X H = VBF + VH + t t H

H →γ γ , s = 8 TeV∫ L dt = 20.3 fb-1

10-1

ͱͷ݁߹Λ κV (= κW = κZ ), ϑΣϧϛΦϯͱͷ݁߹ΛκF (= κt = κb = κτ = ...) ͱ͢ΔɻH→ W W (∗) → ℓνℓννϟϯωϧͰͦΕͧΕ κV = 1.04±0.11, κF = 0.93+0.32
−0.23

10-2
6

data / predictionͱଌఆͨ͠ [8]ɻʮେαϚϦʔʯ࿦จͰ͸͢΂ͯͷղੳνϟϯωϧΛ౷߹ͨ݁͠ՌΛެ։͢ΔͷͰ, ৄ͘͠͸ͦͪΒΛࢀߟʹͯ͠΄͍͠ɻ

5.4

ඍ෼அ໘ੵ

4
2
0
0

20

40

60

80 100 120 140 160 180 200
p γ γ [GeV]T

dσfid / dp [fb/GeV]ώοάεཻࢠͷ 4 ‫ݩ‬ӡಈྔ·Ͱ࠶ߏ੒Ͱ͖ΔղੳνϟϯωϧͰ͸ώοάεཻࢠͷԣӡಈྔͷؔ਺ͱͯ͠ͷஅ໘

TੵͳͲ͞·͟·ͳඍ෼அ໘ੵΛଌఆ͢Δ͜ͱ͕Ͱ͖Δɻ
(∗)

H→ γγ ͱ H→ ZZ → 4ℓ νϟϯωϧΛ༻͍ͯ, ώοάεཻࢠͷԣӡಈྔ΍ϥϐσΟςΟ, ෇ਵ͢ΔδΣοτͷ

0.06
0.05

s = 8 TeVੵΛଌఆͨ͠ɻͨͱ͑͹, େ͖ͳੜ੒அ໘ੵΛ΋ͭ ggF

0.02

ͷͰ, ώοάεཻࢠͷ pT ʹΑΔඍ෼அ໘ੵͷଌఆ͸ൺώοάεཻࢠͷԣӡಈྔ෼෍͸, ౷‫ܭ‬ͷগͳ͍Ұ൪௿͍Ϗϯͱߴ͍ϏϯΛআ͍ͯ, ‫ͯ͠ͱܗ‬͸ඪ४ཧ࿦Λ࠶‫͠ݱ‬
͍ͯΔͱ‫ͱ͜͏ݴ‬΋Ͱ͖Δɻ͢΂ͯͷଌఆͰ·ͩ౷‫ܭ‬ෆ଍Ͱ͋Γ, ͜ͷΑ͏ͳଌఆΛҾ͖ଓ͖ߦ͏͜ͱ͸ώοάεཻࢠʹؔ͢Δੜ੒அ໘ੵͳͲͷΑΓߴ࣍ͷਫ਼ີͳ‫ࢉܭ‬΍ϞϯςΧϧϩγϛϡϨʔγϣϯͷൃలʹඇৗʹॏཁͰ
͋Δɻ͜ΕΒͷൃలͳͯ͘͠͸, ඪ४ཧ࿦ͱ߹͏, ߹Θͳ͍Λٞ࿦͢Δ͜ͱ͸Ͱ͖ͳ͍ɻ࣮ࡍ, LHC ࣮‫͕࢝ݧ‬·͔ͬͯΒͷ͜ͷ෼໺ͷਐల͸Ί͟·͍͠΋ͷͰ͋Δɻ

5.5

அ໘ੵ

gg →H (POWHEG+PS) + X H

X H = VBF + VH + t t H

020

ֱతӡಈྔͷখ͍͞άϧʔΦϯ΍ΫΥʔΫͷ์ग़ͷϞϯಈྔ, ਤ 21 ͸෇ਵ͢ΔδΣοτ਺ͷඍ෼அ໘ੵͰ͋Δɻ

syst. unc.

gg →H (MiNLO HJ+PS) + X H

0.01

খ͍͞άϧʔΦϯ΍ΫΥʔΫͷ pT ͱόϥϯε͍ͯ͠ΔॏཁͳΠϯϓοτͱͳΔɻਤ 20 ͸ώοάεཻࢠͷԣӡ∫ L dt = 20.3 fb-1

gg →H (HRES) + X H

0.03ςΧϧϩͷϞσϦϯά, ͭ·Γ, perturbative-QCD ΁ͷ

data

0.04

਺΍ͦͷԣӡಈྔ, 2 ͭͷδΣοτͷ֯౓ͳͲͷඍ෼அ໘աఔʹ͓͍ͯ͸, ώοάεཻࢠͷ pT ͸, ൺֱతӡಈྔͷ

ATLAS
H → ZZ* → 4l

4060

80 100 120 140 160 180 200
p [GeV]T,H

ਤ 20: H→ γγ(্), H→ ZZ (∗) → 4ℓ(Լ) νϟϯωϧʹ

͓͚Δώοάεཻࢠͷԣӡಈྔʹର͢Δඍ෼அ໘ੵ [18,19]ɻ࿦԰͞Μ͔Β͸සൟʹґཔ͞ΕΔଌఆ஋ͷͻͱͭͰ, ཧ࿦Ϟσϧʹ (͋·Γ) ґଘ͠ͳ͍ྔͷͨΊ༷ʑͳཧ࿦Ϟσϧͷ‫ʹূݕ‬ར༻͞ΕΔɻਤ 22 ͸ H→ γγ Ͱଌఆͨ͠
͍͔ͭ͘ͷ “fiducial” ͳஅ໘ੵ [18] Ͱ͋Δɻଌఆ஋ͷத৺஋͚ͩʹ஫໨͢Δͱ‫׬‬શͳ‫ํࢉܭ‬๏ɾख๏͸·ͩଘࡏ͠ͳ͍Α͏ʹ‫͑ݟ‬Δ͕ɺ݁࿦͢Δʹ͸ΑΓଟ͘ͷσʔλ͕ඞཁͰ͋Δɻ

6ʮώοάεཻࢠʯൃ‫Ͱ·ݟ‬ͷาΈ֤νϟϯωϧͷ࠷৽ͷʮαϚϦʔʯ࿦จͷ “inclusive”

ਤ 23 ͸ൃ‫ݟ‬࿦จ [1] ͷදࢴΛ০ͬͨώοάεཻࢠͷͳஅ໘ੵΛද 3 ʹ·ͱΊΔɻ่յ཰͕ҟͳΔͨΊ, ͓‫ޓ‬֤࣭ྔʹର͢Δ local p0 Ͱ, 2 ͭͷॏཁͳϝοηʔδ͕͍ʹ௚઀ൺֱ͢Δ͜ͱ͸Ͱ͖ͳ͍ɻ‫ج‬ຊతʹ µ ஋Λʮੜ

͋Δɻͻͱͭ͸ 125 GeV ෇ۙʹόοΫάϥ΢ϯυʹର੒அ໘ੵ × ่յ཰ʯʹম͖௚ͨ͠΋ͷͰ͋Δɻ

ͯ͠ඇৗʹେ͖ͳΠϕϯτ௒ա͕͋Δ͜ͱ, ΋͏ͻͱͭ

“Fiducial” அ໘ੵ͸‫ݕ‬ग़‫ޮث‬ՌΛআ͍ͨύʔτϯϨϕϧͷ kinematics ʹରͯ͠, ‫ج‬ຊతͳબ୒৚݅Λ՝ͨ͠‫ޙ‬͸ͦΕҎ֎ͷྖҬʹ͍ͭͯ͸ 2σ ҎԼͷ;Β͖ͭʹམͪͷஅ໘ੵͷͨΊ, H→ γγ Ҏ֎͸ͦͷ৚͕݅ෳࡶͰຊߘ

࠷΋େ͖͘ͳΓ, ͦͷେ͖͞͸ 6.0σ (‫ظ‬଴஋͸ 4.9σ) ͰͰ͸͢΂ͯΛ໢ཏ͢Δ͜ͱ͸Ͱ͖ͳ͍ [8, 19]ɻ͜Ε͸ཧண͍͍ͯΔ͜ͱͰ͋Δɻ126.5 GeV Ͱ‫؍‬ଌͨ͠༗ҙ౓͕

12

σfid [fb]

256
35

ATLAS

data

syst. unc.

Diphoton baseline

gg →H (MiNLO HJ+PY 8) + X H

30

N jets ≥ 1(K ggF = 1.54)

25

X H = VBF + VH + t t H

H →γ γ , s = 8 TeV

syst. unc.

N jets ≥ 3

X H = VBF + VH + t t H

p jet > 30 GeV
T

15

LHC-XS + X H
HRes 2.2 + X H
STWZ + X H
JetVHeto + X H
BLPTW + X H

VBF-enhanced
N leptons ≥ 1

10
miss

ET

5
data / predictiondata

N jets ≥ 2∫ L dt = 20.3 fb-1

20

ATLAS
H →γ γ , s = 8 TeV∫ L dt = 20.3 fb-1

MiNLO HJ+PY8 + X H
MiNLO HJJ+PY8 + X H> 80 GeV

10-1 2×10-1

0

2 3 451

102
σfid [fb]

20 30

10

4

ਤ 22: H→ γγ Ͱଌఆͨ͠ 125.4 GeV ώοάεཻࢠͷ

20“fiducial” அ໘ੵ [18]ɻ“Fiducial” ͷ৚݅͸, 2 ͭͷޫࢠ
0

1

2

≥3

N jetsͷΤωϧΪʔ͕࠶ߏ੒ͨ͠ γγ ࣭ྔͷ 35%, 25%ΑΓେ͖͘, |η| <2.37 Ͱ͋Δɻ
Local p0

ਤ 21: H→ γγ νϟϯωϧʹ͓͚Δ෇ਵ͢ΔδΣοτ਺ (pT > 30 GeV) ʹର͢Δඍ෼அ໘ੵ [18]ɻ

10-2

ද 3: ֤ղੳνϟϯωϧͰଌఆͨ͠ “inclusive” ͳஅ໘ੵ [8, 9]ɻ-4

10ଌఆ஋ σ×BR [pb]mH = 125.36 GeV
H→ W W ∗ ggF 7 TeV
H→ W W ∗ ggF 8 TeV
H→ W W ∗ VBF 8 TeV
mH = 125 GeV
H→ τ τ ggF 8 TeV
H→ τ τ VBF+V H 8 TeV

101ඪ४ཧ࿦Ͱͷ༧‫ݴ‬஋ [pb]ATLAS

1.7+1.9−1.6
0.26+0.11
−0.10

3σ
4σ

10

·Ͱͷ୳ࡧͷྺ࢙Ͱ͋Δɻ2011 ೥ 7 ݄ (ਤ 24 ͷ “07/11

EPS Prel.”) ʹʮ͋Δͷ͔ʁʯͱͦͷ‫ͤ͞ʹؾ‬ΒΕ͔ͯΒΘ͔ͣ 1 ೥Ͱൃ‫ݟ‬Λܴ͑ͨ͜ͱʹͳΔɻATLAS ೔ຊάϧʔϓ΋ຊχϡʔε‫ʹࣄه‬ώοάεཻࢠͷ‫ڀݚ‬੒ՌΛใࠂ͖ͯͨ͠ [23]ɻ

2011 ೥ 7 ݄౰࣌ͷ͜ͱΛ͍֮͑ͯΔํ͸গͳ͍͔΋͠Εͳ͍͕, ͜ͷͱ͖͸ 125 GeV Ͱ͸ͳ͘ 145 GeV ෇ۙʹ஫໨͕ू·ͬͨɻͱ͍͏ͷ΋, ͜ͷྖҬͰ༗ޮͳ W W
νϟϯωϧͰए‫ׯ‬ͷஹީ͕‫ͨͨ͑ݟ‬ΊͰ͋ͬͨɻҰํͰ, ൺֱత͍ܰώοάεΛૂ͍ͬͯͨࢲΛ‫ؚ‬Ή‫ऀڀݚ‬͸

115 GeV ෇ۙ΋·ͩ·͍͚ͩΔͱ͍͏‫ظ‬଴‫ײ‬Λ࣋ͬͯσʔλΛ଴ͬͨɻ֖Λ։͚ͯΈΔͱ 125 GeV ͱ͍͏ͳΜͱ΋‫ྖ͍ͳ͑ݴ‬Ҭʹώοάε͕ଘࡏͨ͠ࣄ࣮͸ΘΕΘΕૉཻࢠ෺ཧֶͷ‫ऀڀݚ‬Λେ͍ʹ೰·͍ͤͯΔ/ָ͠·
͍ͤͯΔɻ

2σ
3σ

5σ

4σ

-6

10

5σ
-8

10

-8

10

10-10
110

6σ

-10

10

6σ

1.22 ± 0.14
0.17 ± 0.01

ਤ 24 ͸ local p0 Ͱࣔͨ͠ ATLAS ͷώοάεཻࢠൃ‫ݟ‬

1
10-2
10-4

3.3 ± 0.4
4.2 ± 0.5
0.35 ± 0.02

͋ͬͨ 10 ɻ

s = 7 - 8 TeV

2σ-6

2.0+2.1−2.0
4.6+1.2−1.1
0.51+0.22−0.172011 - 12

110

115

120

125

Observed

150

200

300

130

135

140

145

150

Expected Signal ± 1 σ

400

500

mH [GeV]ਤ 23: 2012 ೥ 7 ݄ͷ ATLAS ࣮‫ݧ‬ͷώοάεཻࢠͷ֤࣭ྔʹର͢Δ local p0 [1]ɻࠩ͠ࠐΈਤ͸͍࣭ܰྔྖҬΛ֦େͨ͠΋ͷɻ7·ͱΊͱల๬

LHC ࣮‫ݧ‬ͷ Run 1 ͸ʮώοάεཻࢠͷൃ‫ݟ‬ʯͱ͍͏େ͖ͳ੒ՌΛ‫͛ڍ‬Δ͜ͱ͕Ͱ͖ͨɻ͝ଘ͡ͷΑ͏ʹ, ൃ‫ޙݟ‬Θ͔ͣҰ೥Ͱώοάε‫ߏػ‬Λఏএͨ͠ϑϥϯιϫɾΞϯάϨʔϧ 11 ͱϐʔλʔɾώοάε [22] ʹϊʔϕϧ৆͕ଃΒΕΔͱ͍͏‫Ͱܗ‬, ͜ͷൃ‫ݟ‬͸࠷ߴͷධՁΛड͚ͨɻ͜Ε·Ͱղઆͨ͠Α͏ʹ, ࣭ྔ͕໿ 125 GeV Λ΋ͭεΧϥʔཻࢠͰ, ͦͷੑ࣭͸ଌఆਫ਼౓ͷൣғͰඪ४ཧ࿦ͷώοάεཻࢠͰ͋ͬͨɻ͜ͷൃ‫ʹݟ‬ΑΓඪ४ཧ࿦ͷ࿮૊ΈͷதͰ༧ଌͨ͢͠΂ͯͷૉཻࢠ͸୳ࡧͰ͸ͳ͘ਫ਼ີଌ
ఆͷର৅ͱͳͬͨɻATLAS ࣮‫Ͱݧ‬΋ࠓ‫͜ޙ‬ͷώοάε
ཻࢠΛపఈతʹௐ΂Δ͜ͱ͸‫Ͱ·͏ݴ‬΋ͳ͍ɻॏ৺‫ܥ‬ΤωϧΪʔ͕ 8 TeV ͔Β 13 TeV ʹ্͕ΔͨΊ, ਤ 25 ʹࣔ͢Α͏ʹ ggF ͳͲ͸໿ 2-3 ഒ, τʔλϧͷ࣭ྔ͕େ͖
͍ tt̄H ͸ 5 ഒऑͷੜ੒அ໘ੵʹͳΔͨΊಉ͡σʔλྔ

10 ిࢠͱޫࢠͷΤωϧΪʔεέʔϧͷ‫ܥ‬౷‫ࠩޡ‬͸ asymptotic ap-

proximation Ͱѻ͑ͳ͔ͬͨͨΊ Toy MC Λ༻͍, ࠷ऴ݁Ռ͸ 5.9σͰ͋ͬͨɻ

11 ΞϯάϨʔϧͱͷ‫ڞ‬ஶऀͰ͋Δϩόʔτɾϒϥ΢τ͸࢒೦ͳ͕Β2011 ೥ʹ๢͘ͳͬͨɻ

13
257

Local p0[2] CMS, Phys. Lett. B 716 (2012) 30.
s = 7 TeV (2011), ∫ Ldt = 4.8 fb

-1

ATLAS

s = 8 TeV (2012), ∫ Ldt = 5.9 fb

-1

1
1σ
10-1
2σ
-2
10
-3
3σ
10 07/11 EPS Prel.
Observed-4
10
Expected4σPrel.
10-5 12/11 CERN
Observed
Expected
10-6
5σ-7 Spring 2012 PRD
10Observed-8
Expected
10
07/12 CERN Prel.
PLB 07/12
6σ
10-9
Observed
Observed
Expected
Expected-10
10
110 115 120 125 130 135 140 145 150[3] খಛूʮLHC ࣮‫·͕࢝ݧ‬Δʯ, ೔ຊ෺ཧֶձࢽ 62(2007) 907.
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mH [GeV]ਤ 24: 2011 ೥ 7 ݄͔Β 2012 ೥ 7 ݄·Ͱͷ ATLAS ͷ

local p0 ͷྺ࢙ɻ[8] ATLAS, arXiv:1412.2641 (Submitted to PRD).
[9] ATLAS,

arXiv:1501.04943(Submitted

toJHEP).
Ͱ΋ଟ͘ͷώοάεཻࢠΛ‫؍‬ଌ͢Δ͜ͱ͕‫ظ‬଴Ͱ͖Δɻ·ͨ, ଟ͘ͷ BSM (New Physics Beyond the Standard

Model) ͷϞσϧͰ͸ෳ਺ͷώοάεͷଘࡏ͕༧‫͞ݴ‬Ε͍ͯΔͨΊ, 125 GeV Ҏ֎ͷώοάεཻࢠͷ୳ࡧ΋͜Ε

[10] ATLAS, JHEP 01 (2015) 069.
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·ͰҎ্ʹਫ਼ྗతʹߦ͍, BSM ͷ࣮‫ݧ‬తώϯτΛ௫Έ,[12] ATLAS, Phys. Lett. B 732 (2014) 8.

࠷ऴతʹ͸ൃ‫͍ͨ͠ݟ‬ɻATLAS ࣮‫ݧ‬͸࠷େ 3000 fb−1

[13] ATLAS, Phys. Rev. Lett. 112 (2014) 201802.

ͷσʔλऔಘΛ༧ఆ͍ͯ͠Δ௕‫Ͱݧ࣮ظ‬, ΘΕΘΕ͸·ͩͦͷ 1%͔͠‫͍ͳ͍ͯݟ‬ɻ࢒Γͷ 99%Ͱ, ͞Βʹඪ४

[14] ATLAS, EPJC 74 (2014) 3071.

ཧ࿦Λ֬‫ͨݻ‬Δ΋ͷʹ͢Δͷ͔, ͦΕͱ΋, ඪ४ཧ࿦͔

[15] ATLAS, Phys. Lett. B 726 (2013) 88, ATLAS-ΒͷζϨΛ‫ݟ‬ग़͢ͷ͔ΘΕΘΕʹ͸·ͬͨ͘‫ݟ‬౰΋͔ͭ

CONF-2014-009.

ͳ͍ɻ͍ͣΕʹͤΑ, ώοάε෺ཧ΋ LHC ࣮‫ݧ‬΋·ͩ
·ͩελʔτͨ͠͹͔ΓͰ͋ΔɻRun 2 Ҏ߱΋େൃ‫ݟ‬ͷχϡʔεΛ‫ظ‬଴ͯ͠௖͖͍ͨɻ

[17] ATLAS, Phys. Lett. B 726 (2013) 120.

2

LHC HIGGS XS WG 2014

σ(pp → H+X) [pb]10)

D + NLO EW

LO+NNLL QC

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[18] ATLAS, JHEP 09 (2014) 112.
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10[20] CMS, arXiv:1412.8662 (Submitted to EPJC).
LO
pp → qqH (NN)

QCD + NLO EW[21] ATLAS, ATLAS-CONF-2014-042.

)
QCD + NLO EW
pp → WH (NNLO)
QCD + NLO EW
LO
(NN
ZH
→
pp
O QCD)
LO and NL
pp → bbH (NN

1

10-1

pp → ttH

78[22] F. Engler, R. Brout, Phys. Rev. Lett. 13 (1964)

CD)

MH = 125 GeV
MSTW2008(NLO Q

9

10

11

12

13

14
s [TeV]ਤ 25: ࣭ྔ 125 GeV ͷώοάεཻࢠͷੜ੒அ໘ੵͷ LHC√Ճ଎‫ث‬ͷॏ৺‫ܥ‬ΤωϧΪʔґଘੑ ( s = 7−14 TeV) [5]ɻࢀߟจ‫ݙ‬[1] ATLAS, Phys. Lett. B 716 (2012) 1.

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