Boosted Higgs channels Matthias Schlaffer DESY 1312.3317 C. - - PowerPoint PPT Presentation

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Boosted Higgs channels Matthias Schlaffer DESY 1312.3317 C. - - PowerPoint PPT Presentation

Aug 27, 2022 190 likes •439 views

Boosted Higgs channels Matthias Schlaffer DESY 1312.3317 C. Grojean, E. Salvioni, MS, A. Weiler 1405.4295 MS, M. Spannowsky, M. Takeuchi, A. Weiler, C. Wymant Blois, June 2015 New Physics in gluon fusion h h h F h F h F

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SLIDE 1

Boosted Higgs channels

Matthias Schlaffer

DESY

1312.3317 C. Grojean, E. Salvioni, MS,

  • A. Weiler

1405.4295 MS, M. Spannowsky,

  • M. Takeuchi, A. Weiler, C. Wymant

Blois, June 2015

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SLIDE 2

New Physics in gluon fusion

h h F ⇒ h h F ⇒ h h F

if m2

h

4m2

F

≪ 1

⇔ Leff = αS 12πvGa

µνGa µνh

Matthias Schlaffer 1

slide-3
SLIDE 3

New Physics in gluon fusion

h h F ⇒ h h F ⇒ h h F

if m2

h

4m2

F

≪ 1

⇔ Leff = αS 12πvGa

µνGa µνh

  • 1. New particles Lg = κgLeff
  • 2. Modified top Yukawa: Lt = −κt

mt v t¯ th → κtLeff σgg→h ∝

  • κt ×

+ κg ×

  • 2

∝ |κt + κg|2

Matthias Schlaffer 1

slide-4
SLIDE 4

Breaking the degeneracy

> t¯ th-channel 95% CL limits: ATLAS: µ < 4.7 [CONF-2015-006] CMS: µ < 4.2 [1502.02485] .

Matthias Schlaffer 2

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SLIDE 5

Breaking the degeneracy

> t¯ th-channel 95% CL limits: ATLAS: µ < 4.7 [CONF-2015-006] CMS: µ < 4.2 [1502.02485] .

[1306.4581]

Break degeneracy by high pT Higgs production

Matthias Schlaffer 2

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SLIDE 6

Outline

Situation in MCHM Situation in SUSY Analysis of pp → h + jet Collider study Conclusion ?

Matthias Schlaffer 3

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SLIDE 7

Gluon fusion in MCHM

Independent of mass spectrum (ξ = v2/f2):

[0711.0828, 1010.2753, 1110.5646, 1303.5701, 1308.0559]

κt + κg = v ∂ ∂h log det Mt(h)

  • h

∗

= 1 − 2ξ √1 − ξ Mt: mass matrix of top sector ∗: most realizations of MCHM

  • Κt Κg 1 2 Ξ

1 Ξ 400 600 800 1000 1200 0.2 0.0 0.2 0.4 0.6 0.8 1.0

mlightest GeV Κg Κt MCHM5, Ξ 0.1, 110 GeV mh 140 GeV

Matthias Schlaffer 4

slide-8
SLIDE 8

Gluon fusion in SUSY

σMSSM

incl

σSM

incl

= (1 + ∆t)2 with ∆t ≈ mt

4

  • 1

m2

˜ t1

+

1 m2

˜ t2

− (At−µ/ tan β)2

m2

˜ t1m2 ˜ t2

  • 200 400 600 80010001200

200 400 600 800 1000 1200 mt

  • 2 GeV

At GeV

0.0 0.1 0.1

200 400 600 800 10001200 200 400 600 800 1000 1200 mt

  • 2 GeV

At GeV

0.0 0.1 0.1

400 600 800 10001200 200 400 600 800 1000 1200 mt

  • 2 GeV

At GeV

0.0 0.1 0.1

m˜

t1 = 170 GeV

m˜

t1 = 220 GeV

m˜

t1 = 270 GeV

µ = 200 GeV tan β = 10 ∆t = const. mQ3, mu3 / ∈R unstable vacuum, A2

t > 3

  • m2

˜ t1 + m2 ˜ t2

  • − 3µ2 [hep-ph/9507294, hep-ph/9602414]

Matthias Schlaffer 5

slide-9
SLIDE 9

Analysis of pp → h + jet

σ(κt, κg) ∝

  • κt ×

t + κg ×

  • 2

σpmin

T (κt, κg)

σSM

pmin

T

= (κt + κg)2 + δκtκg + ǫκ2

g

pmin

T

[GeV] σSM

pmin

T

[fb] δ ǫ gg, qg [%] 100 2200 0.016 0.023 67, 31 . . . 800 0.37 3.7 8.4 42, 57

large pmin

T

⇔ large δ, ǫ ⇔ small cross section

Matthias Schlaffer 6

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SLIDE 10

Observable for boosted measurement

R = σ650 GeV(κt, κg)K650 GeV σ150 GeV(κt, κg)K150 GeV

Kpmin

T : NLO (mt → ∞) K-factor 0.6 0.8 1.0 1.2 1.4 0.3 0.2 0.1 0.0 0.1 0.2 0.3

Κt Κg

.0 2.19 103 .0 1.23 103 .0 0.692 103 Μincl

  • bs0.8 20
  • µincl = 0.8

0.6 0.8 1.0 1.2 1.4 0.3 0.2 0.1 0.0 0.1 0.2 0.3

Κt Κg

.0 2.71 103 .0 1.69 103 .0 0.985 103 Μincl

  • bs1.0 20
  • µincl = 1.0

h → ττ channel, L = 3 ab−1

κt = 0.8 κt = 1.0 κt = 1.2 κt = 0.8 κt = 1.0 κt = 1.2

SM SM

Matthias Schlaffer 7

slide-11
SLIDE 11

Monte Carlo events

> Decay channel: h → 2ℓ + / ET > Signal sample

– Generated in mt → ∞ limit – Reweighted along |κt + κg|2 = 1.0 ⇒ worst case scenario – Decay modes: h → WW ∗ → ℓ+ℓ−ν¯ ν (BR = 1.4%) h → τ +τ − → ℓ+ℓ−ν¯ ν (BR = 0.77%)

> Background samples

– W, Z, t¯ t + jets – W-modes: W → e, µ, τ including Ws from t decay – Z-mode: Z → τ +τ − → ℓ+ℓ−ν¯ ν

Matthias Schlaffer 8

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SLIDE 12

Analysis

> Boosted Higgs:

  • pT,h
  • =
  • /

ET + pT,ℓ1 + pT,ℓ2

  • > 200 GeV

> Parton to recoil: 1 fat jet, pT > 200 GeV > Split by decay channel: h → WℓW ∗

ℓ

h → τℓτℓ Rest frame: ℓ ℓ ν ν ν ν ℓ ν ℓ ν Lab frame: / pT ℓ ℓ / pT ℓ ℓ / pT outside leptons / pT inside leptons

Matthias Schlaffer 9

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SLIDE 13

h → WℓW ∗

ℓ channel

> / pT outside of leptons > m2

T,ℓℓ = m2 ℓℓ + 2(ET,ℓℓ /

ET − pT,ℓℓ · / pT ) ≤ m2

h

[GeV]

T,ll

m 100 200 300 400 Normalized distribution 0.1 0.2

WWj tt WW → h reject

> leptons close: ∆Rℓℓ < 0.4 L = 300 fb−1 : S/B ∼ 0.4 and S/ √ B > 6

Matthias Schlaffer 10

slide-14
SLIDE 14

h → τℓτℓ channel

> / pT inside of leptons > Reduce t¯ t and WW background: mℓℓ < 70 GeV > Collinear approximation: pνi ∝ pℓi and / pT = pT,ν1 + pT,ν2 Mcol = mh ± 10 GeV

[GeV]

col

M 100 200 300 [fb/5GeV]

col

/dM σ d

  • 2

10

  • 1

10 1 10

Zj tt WWj τ τ → h WW → h

SR >200GeV

rec T,H

p

L = 300 fb−1 : S/B ∼ 0.4 and S/ √ B > 9

Matthias Schlaffer 11

slide-15
SLIDE 15

Results for h → τ +τ − channel

Binned likelihood analysis with CLs method

99.9% CL 95% CL L [fb−1] Confidence Level 103 102 101 100 100 10−1 10−2 10−3 10−4 99.9% CL 95% CL L [fb−1] Confidence Level 103 102 101 100 100 10−1 10−2 10−3 10−4

g

κ

  • 0.5

0.5 )

  • 1

Confidence Level (L=3000fb

  • 4

10

  • 3

10

  • 2

10

  • 1

10 1 95% CL 99.9% CL τ τ → for H

10% 5% 0%

  • Syst. err.

κt = 1.0 against background κt = 0.5 against SM signal L = 3 ab−1 against SM signal

Matthias Schlaffer 12

slide-16
SLIDE 16

Conclusions

> Two effects of new physics in gluon fusion: modified top Yukawa (κt) and new loop particles (κg) > Can be disentangled with boosted Higgs > Alternative to t¯ th > Decay channels: h → WℓW ∗

ℓ and h → τ + ℓ τ − ℓ

> Worst case (SM-like incl. cross section): −0.4 ≤ κg ≤ 0.3 @ 95% CL with 3 ab−1

Matthias Schlaffer 13

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SLIDE 17

Backup slides

slide-18
SLIDE 18

Boosted Higgs in MCHM

EFT vs. full calculation σEFT (pp → h + jet) σfull(pp → h + jet) . By initial state

  • gg

qg qg qq 400 600 800 1000 1200 1 2 3 4 mlightest GeV ΣEFT Σfull MCHM5, pT 650 GeV

Ay All initial states combined

  • 400

600 800 1000 1200 0.6 0.8 1.0 1.2 1.4 1.6 mlightest GeV ΣEFT Σfull MCHM5, pT 650 GeV

Matthias Schlaffer 15

slide-19
SLIDE 19

Boosted Higgs in MCHM

EFT vs. full calculation σEFT (pp → h + jet) σfull(pp → h + jet) . By initial state

  • gg

qg qg qq 400 600 800 1000 1200 1 2 3 4 mlightest GeV ΣEFT Σfull MCHM5, pT 650 GeV

Ay All initial states combined

  • 400

600 800 1000 1200 0.6 0.8 1.0 1.2 1.4 1.6 mlightest GeV ΣEFT Σfull MCHM5, pT 650 GeV

EFT description safe for mlightest > 500 GeV

Matthias Schlaffer 15

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SLIDE 20

Boosted Higgs in SUSY

20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 20 40 60 80 100 120 140 160 180 200

100 200 300 400 500 600 700 800 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 pTminGeV ΣMSSMΣSM P1 P2 P3 P4 Point m˜

t1 [GeV]

m˜

t2 [GeV]

At [GeV] ∆t P1 171 440 490 0.0026 P2 192 1224 1220 0.013 P3 226 484 532 0.015 P4 226 484 0.18

At h ˜ t,˜ b L L L R

Matthias Schlaffer 16

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SLIDE 21

MCHM5 setup [1106.2719]

L = i¯ qL / DqL + i¯ tR / DtR + i¯ Ψ / DΨ − m4 ¯ ψ4ψ4 − m1 ¯ ψ1ψ1 −

  • λq ¯

QLU T ΨR + λu ¯ ΨLUQR + h.c.

  • Ψ = (ψ4, ψ1)T 5 ∼ 4 ⊕ 1

QL =   q′

L

qL

  • u′

L

  , QR =   qt

R

q′t

R

  • tR

 

Matthias Schlaffer 17

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SLIDE 22

Higgs mass in MCHM (mh ± 5 GeV)

500 1000 1500 2000 2500 500 1000 1500 2000 2500 mT GeV mT

GeV

Ξ0.1 Ξ0.2

Matthias Schlaffer 18

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SLIDE 23

Higgs Shapes: Cutflow h → ττ

→

Event rate [fb] H → ττ H → W W ∗ WW+j Z→ττ +j t¯ t+j S/B S/ √ B

  • 0. Nominal cross-section

3149.779 10719.207 580.000 1.01·104 1.02·105 – –

  • 1. n = 2, opposite-sign

118.043 323.531 195.033 347.516 3.72·104 – –

  • 2. m > 20 GeV

117.733 264.723 189.522 315.201 3.57·104 – –

  • 3. prec

T,H > 200 GeV

1.987 3.834 91.273 104.434 1.28·103 0.004 2.62

  • 4. nfat

j

= 1 (pT,j > 200 GeV) 0.957 1.858 50.443 58.810 395.602 0.006 2.17

  • 5. nb = 0

0.940 1.825 48.855 57.068 105.851 0.01 3.29

  • 6. /

pT inside the two leptons 0.923 0.533 20.215 55.551 44.050 0.01 2.30

  • 7. m < 70 GeV

0.796 0.490 3.860 53.985 8.511 0.02 2.73

  • 8. |Mcol − mH| < 10 GeV

0.749 0.046 0.298 1.019 0.758 0.38 9.56 prec

T,H > 300 GeV

0.234 0.012 0.115 0.343 0.166 0.39 5.40 prec

T,H > 400 GeV

0.068 0.006 0.042 0.106 0.049 0.38 2.88 prec

T,H > 500 GeV

0.021 0.001 0.014 0.038 0.010 0.36 1.55 prec

T,H > 600 GeV

0.008 0.001 0.006 0.014 0.005 0.32 0.89

Uncertainties in σpT,H L = 300 fb−1 L = 3000 fb−1 pT,H > 200 GeV 12% 4% pT,H > 300 GeV 22% 7% pT,H > 400 GeV 41% 13%

Matthias Schlaffer 19

slide-24
SLIDE 24

Higgs Shapes: Cutflow h → WW

→

Event rate [fb] H → W W ∗ H → ττ WW+jets Z→ττ +jets t¯ t+jets S/B S/ √ B

  • 5. nb = 0

1.825 0.940 48.855 57.068 105.851 0.01 3.29

  • 6. m

T 2 > 10 GeV

1.096 0.002 25.241 0.028 53.730 0.01 2.14

  • 7. mT, < 125 GeV

1.095 0.002 3.809 0.023 7.235 0.10 5.70

  • 8. ∆R < 0.4

0.330 0.000 0.426 0.002 0.450 0.38 6.11 prec

T,H > 300 GeV

0.128 0.000 0.254 0.002 0.175 0.30 3.38 prec

T,H > 400 GeV

0.034 0.000 0.124 0.000 0.040 0.21 1.44 prec

T,H > 500 GeV

0.010 0.000 0.058 0.000 0.011 0.14 0.65 prec

T,H > 600 GeV

0.004 0.000 0.033 0.000 0.005 0.10 0.33 Matthias Schlaffer 20