Higgs couplings: effects beyond total rates. Heidelberg Dorival Gonçalves

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1 Higgs couplings: effects beyond total rates Heidelberg !!

2 Outline Off-She Higgs Theoretical ingredients New probe to the Higgs portal coupling at LHC WBF 1 TeV: what can we learn from it? Spin correlations: direct Higgs-top CP-structure measurement via H Possible BSM applications Heidelberg

3 Off-She Higgs Production Just recently, we start to recognize the importance of the Off-She Higgs since H/m H one naively expects very sma off-she rates d (g ig f ) 2 dm 4l H d dm 4l (g i g f ) 2 (m 2 4l m 2 H )2 However, at least 15% of the H>4l cross-section comes from m4l>3 GeV Spectacular fail of Narrow Width Approximation Interference with background: gg H * ZZ with gg ZZ ; ZZ Threshold; and top mass effects change our naive expectation Kauer, Passarino 212 Caola, Melnikov 213 Campbe, Eis, Wiiams 213! Heidelberg

4 Theoretical ingredients Signal and background components: (a) (b) (c) a 2 - Background component: generated already at tree level (large) known at NNLO b 2 - continuum background c 2 - Higgs signal Re{b*c} - Signal/background interference large and destructive at large invariant mass c 2 and b*c present similar perturbative QCD enhancement: K NLO K NLO b c c 2 Bonvini, Caola, Forte, Melnikov, Ridolfi (213) (Cascioli et. al. 214) b+c 2 - (loop induced) known at NLO (w/o mt effects). Internal masses make it a non-trivial multi-scale problem; Very important calculation for Run II Caola, Melnikov, Röntsch, Tancredi (215) Technology is there: gg>hh See Gudrun s talk Heidelberg

5 Theoretical ingredients Carries information on the Higgs couplings at different energy scales Campbe, Eis, Wiiams 213! Heidelberg

6 Theoretical ingredients Carries information on the Higgs couplings at different energy scales Destructive interference The Higgs does what he is expected to do! (Quigg, Lee, Thacker 1977) Heidelberg

7 Off-she probe to Higgs Portal with h S S mh>2ms: strong VBF bounds See Ben & di Maria s talk DG, Han, Mukhopadhyay (217) Heidelberg

8 Off-she probe to Higgs Portal with 1 BR hæinv <2% <5% h S 8 14 TeV L=3 ab -1 S lshmh 2 L 6 mh>2ms: strong VBF bounds See Ben & di Maria s talk mh<2ms: sensitivity BW suppressed 4 2 2s VBF DG, Han, Mukhopadhyay (217) m Heidelberg

9 Off-she probe to Higgs Portal with dσ dm 4l fb GeV gg 4l SM singlet singlet 2 λ S (m )=3 h 2 λ S (m )=4 h -3 1 Separably renormalizable, UV finite, gauge-invariant subset Corrections are also at NLO gg!4l / 2 S order m S =8 GeV BSM/SM [GeV] m 4l DG, Han, Mukhopadhyay (217) Heidelberg

10 Off-she probe to Higgs Portal with 1 BR hæinv <2% <5% lshmh 2 L TeV L=3 ab TeV L=15 ab -1 Separably renormalizable, UV finite, gauge-invariant subset Corrections are also at NLO gg!4l / DG, Han, Mukhopadhyay (217) 2 S order m Heidelberg s off-she 2s off-she 2s VBF

11 Off-she probe to Higgs Portal with 1 BR hæinv <2% <5% lshmh 2 L TeV L=3 ab TeV L=15 ab -1 Naturalness DG, Han, Mukhopadhyay (217) m Heidelberg s off-she 2s off-she 2s VBF

12 Future: off-she WBF WBF presents exclusively tree-level Higgs-EW boson couplings More model independent However, it presents very weak bounds at LHC Run-I ᴦ H /ᴦ H,SM <6, whereas GF channel ᴦ H /ᴦ H,SM <6.5 (CMS) What can we do with it at the 1 TeV coider? DG, Thompson, Plehn (217) Heidelberg

13 Future: off-she WBF Tagging jet kinematics at 1 TeV dσ σ 1 pp Hjj EW max.4 d η 1 TeV j 13 TeV.3.2 σ 1 dσ d η jj pp Hjj 1 TeV EW 13 TeV 1 TeV η 13 TeV η <5 j <5 j η max j η jj Tagging jets are even more forward at 1TeV DG, Thompson, Plehn (217) Heidelberg

14 Future: off-she WBF Dawson (1985).4 dσ σ 1 d η max j pp ZZjj EW,only-H 1 TeV 12<m 4l /GeV<13 4<m 4l /GeV<6 m 4l >6 GeV.3 σ 1 dσ d η jj pp ZZjj EW,only-H 1 TeV 12<m 4l /GeV<13 4<m 4l /GeV<6 m 4l >6 GeV η max j η jj DG, Thompson, Plehn (217) Heidelberg

15 Future: off-she WBF Dawson (1985).4 dσ σ 1 d η max j pp ZZjj EW,only-H 1 TeV 95% CL SM Γ H /Γ H <m 4l /GeV<13 4<m 4l /GeV<6 m 4l >6 GeV.3.2 limits based dσ σ 1 on (m, η ) 4l jj ±2 σ d η ±1 σ jj Expected pp ZZjj EW,only-H 1 TeV 12<m 4l /GeV<13 4<m 4l /GeV<6 m 4l >6 GeV L=2 ab max η j η j η jj DG, Thompson, Plehn (217) Heidelberg

16 Exciting opportunities ahead! H channel is around the corner at LHC: Expected precisions Scenario1: systematic uncertainties same as now Scenario1I: theoretical uncertainty divided by 1/2 and systematic by 1/sqrt(L) Heidelberg

17 Exciting opportunities ahead! H channel is around the corner at LHC: Can we directly measure Higgs-top CP structure at the LHC? Not excluded from Higgs measurements J. Eis, Hwang, Sakurai, Takeuchi (214) Boudjemaa, Godbole, Guadagnoli,Mohan (215) Buckley, DG (215) While CP-odd H-V appears only at dim-6 or higher, CP-odd H-f can manifest at tree-level Mixture possible in some models, e.g., 2HDM Heidelberg

18 Exciting opportunities ahead! H channel is around the corner at LHC: Can we directly measure Higgs-top CP structure at the LHC? Indirect constraints from eedm very strong, yet assume: Coupling strength/structure to light fermions No other states in the spectrum Heidelberg

19 Directly Measuring H - Spin correlations of top and anti-top affected by nature of interaction distribution directly reflects on : Parke, Mahlon (21) dσ σ 1 d φ σ H t i t j σ fu + LL+RR + - LR+RL - LL+RR LR+RL Lab-frame dσ d φ [fb] + LL+RR + - LR+RL - LL+RR LR+RL Lab-frame σ - /σ + p >1 GeV TH φ M + t t LR+RL.4.2 / sin p [GeV] 2 T,H M t t LR+RL / cos 5 p >2 GeV TH φ Top mass effects in presence of a further massive H boson pushes chiral limit to higher scales 2 Buckley, DG (215) Heidelberg

20 Directly Measuring H - Spin correlations of top and anti-top affected by nature of interaction distribution directly reflects on : Parke, Mahlon (21) dσ σ 1 d φ σ - /σ p >1 GeV TH φ σ H t i t j σ fu + LL+RR + - LR+RL - LL+RR LR+RL p [GeV] T,H dσ σ 1 d φ σ + - p >2 GeV, m >75 GeV TH φ /σ + Boosted Higgs (pth>2gev) nicely match with H>bb BDRS algorithm Buckley, DG (215) Plehn, Salam, Spannowsky (29) Heidelberg

21 Directly Measuring H - Higgs candidate is genuinely part of a multi-jet system: Proper modeing of the QCD emissions indispensable requirement for robust analysis Signal & backgrounds (MC@NLO), accounting for spin correlation on top decays b l `+ b b 95% CL BDRS based on (p, φ ) TH jj ±2 σ ±1 σ expected 95% CL b SM σ/σ 2 b 1.5 l ` L [fb ] We can see the H with L~175 fb CL Buckley, DG (215) Heidelberg

22 Directly Measuring H - Higgs candidate is genuinely part of a multi-jet system: Proper modeing of the QCD emissions indispensable requirement for robust analysis Signal & backgrounds (MC@NLO), accounting for spin correlation on top decays b l `+ b b b dσ d φ [fb] + - bb b l `.1 σ /σ BDRS R=1.2 P TJ > 2 GeV φ The fu analysis and higher-order effects did not degrade our observable! Buckley, DG (215) Heidelberg

23 Directly Measuring H - Higgs candidate is genuinely part of a multi-jet system: Proper modeing of the QCD emissions indispensable requirement for robust analysis Signal & backgrounds (MC@NLO), accounting for spin correlation on top decays BDRS based on (p, φ ) TH jj ±2 σ ±1 σ expected 95% CL L -1 ab 6 95% CL 2.5 SM σ/σ L [fb ] 2 LHC High Lumi CP-α vs. CP-even 95% CL exclusion ( φ, φ ( φ, φ ) jj ) jj cos(α) H We can see the H with L~175 fb CL Buckley, DG (215) Heidelberg

24 Directly Measuring H - Higgs candidate is genuinely part of a multi-jet system: Proper modeing of the QCD emissions indispensable requirement for robust analysis Signal & backgrounds (MC@NLO), accounting for spin correlation on top decays Seeking for light pseudoscalars: A(bb) can direct access the Yukawa and explore low ma Tailoring the BDRS analysis for different ma ranges: R~2mA/pTA dσ BDRS dm A fb GeV A bb Z m A =5 GeV BDRS R=.6 P TJ > 2 GeV [GeV] BDRS m A.4 dσ fb A BDRS dm GeV A bb.35 Z BDRS R=1.2 P TJ > 2 GeV m A =15 GeV [GeV] BDRS m A.14 dσ fb A BDRS dm GeV A bb.12 Z BDRS R=2.4 P TJ > 2 GeV m A =2 GeV [GeV] BDRS m A Lopez-val, DG (216) Kozaczuk, Martin (215); Casolino,Spannowsky(215) Heidelberg

25 Directly Measuring H - Higgs candidate is genuinely part of a multi-jet system: Proper modeing of the QCD emissions indispensable requirement for robust analysis Signal & backgrounds (MC@NLO), accounting for spin correlation on top decays Seeking for light pseudoscalars: A(bb) can direct access the Yukawa and explore low ma Tailoring the BDRS analysis for different ma ranges: R~2mA/pTA based on ( η, φ ) ±2 σ ±1 σ expected 95% CL Exclusion plot based on φ Expected 95% CL 95% CL tanβ CL s.1 95% CL CP-even vs. CP-odd.8.6 Type-I 2HDM sin(β-α)= m A =5 GeV L [fb ].1 m A(H) =15 GeV L [fb ] Lopez-val, DG (216) Heidelberg

26 Summary LHC Run II gives very energetic Higgses with significant statistics Off-she important to further explore the TeV scale Off-she probe to Higgs portal couplings provide new very promising bounds for mh<2ms Width measurement is more model independent with WBF 1TeV coider can push the width measurement to below 1% It is possible to access the Higgs-top CP-structure via angular correlations in H Boosted Higgs analysis nicely match with CP-structure measurement Heidelberg

27 Thank you for your aention! Heidelberg