The Little Channels. Tilman Plehn. Aspen, 3/2013. Little Channels. Tilman Plehn. Results. Channels. Higgs couplings. Bottom Yukawa.

Size: px

Start display at page:

Download "The Little Channels. Tilman Plehn. Aspen, 3/2013. Little Channels. Tilman Plehn. Results. Channels. Higgs couplings. Bottom Yukawa."

Julius Moody
5 years ago
Views:

1 The Little Universität Heidelberg Aspen, 3/213

2 Higgs results Fundamental questions 1 What is the Higgs Lagrangian?

3 Higgs results Fundamental questions 1 What is the Higgs Lagrangian? psychologically: looked for Higgs, so found a Higgs CP-even spin- scalar expected spin-1 vector unlikely spin-2 graviton unexpected

4 Higgs results Fundamental questions 1 What is the Higgs Lagrangian? psychologically: looked for Higgs, so found a Higgs CP-even spin- scalar expected spin-1 vector unlikely spin-2 graviton unexpected 2 What are the coupling values?

5 Higgs results Fundamental questions 1 What is the Higgs Lagrangian? psychologically: looked for Higgs, so found a Higgs CP-even spin- scalar expected spin-1 vector unlikely spin-2 graviton unexpected 2 What are the coupling values? coupling after fixing operator basis anomalous couplings [eventually defined in UV completion?]

6 Higgs results Fundamental questions 1 What is the Higgs Lagrangian? psychologically: looked for Higgs, so found a Higgs CP-even spin- scalar expected spin-1 vector unlikely spin-2 graviton unexpected 2 What are the coupling values? coupling after fixing operator basis anomalous couplings [eventually defined in UV completion?] The elephant channel in the room inclusive searches = gluon fusion couplings discovered g Hgg, g Hγγ, g HZZ, g HWW eventually H Z γ [ATLAS-CONF-213-9, CMS-HIG-13-6] to amuse yourself: Who would build this LHC+ATLAS+CMS to (1) discover a particle which couples to mass?? (2) probe unitarity/renormalizability of the weak Lagrangian??

7 Higgs results Limitations of inclusive searches non-perfect purity for H WW deadly background to H b b too little boost for H ττ deadly Drell-Yan background to H µµ [ATLAS-CONF-213-1] no trigger for H invisible

8 Higgs results Limitations of inclusive searches non-perfect purity for H WW deadly background to H b b too little boost for H ττ deadly Drell-Yan background to H µµ [ATLAS-CONF-213-1] no trigger for H invisible Promising first results [many of them presented here] ATLAS H ττ [ATLAS-CONF : σ/σ SM < 1.9 getting there] ATLAS ZH, H invisible [ATLAS-CONF : BR > 65%] ATLAS VH, H b b [ATLAS-CONF ; get to this later] CMS H ττ [CMS-HIG-12-43: σ/σ SM < 1.63 getting there] CMS VH, H ττ [CMS-HIG-12-51; σ/σ SM < 4.68] CMS WH, H WW [CMS-HIG-13-9: σ/σ SM < 3.3] CMS VH, H b b [CMS-HIG-12-44; also later] still energy and/or rate limited

9 Alternative production channels WBF production t W,Z + second-largest rate [small QCD corrections] + tagging jets to trigger and get S/B 1 [m jj very useful] sensitive to pile-up tricky jet veto accessible H WW, ττ, µµ, invisible b,t W,Z

10 Alternative production channels WBF production t W,Z + second-largest rate [small QCD corrections] + tagging jets to trigger and get S/B 1 [m jj very useful] sensitive to pile-up tricky jet veto accessible H WW, ττ, µµ, invisible b,t W,Z WH/ZH production + purely leptonic associate production [trigger, small QCD corrections] low rate, tricky QCD backgrounds [Vbb] missing energy in WH, few leptonic Z decays accessible H b b

11 Alternative production channels WBF production t W,Z + second-largest rate [small QCD corrections] + tagging jets to trigger and get S/B 1 [m jj very useful] sensitive to pile-up tricky jet veto accessible H WW, ττ, µµ, invisible b,t W,Z WH/ZH production + purely leptonic associate production [trigger, small QCD corrections] low rate, tricky QCD backgrounds [Vbb] missing energy in WH, few leptonic Z decays accessible H b b t th production [b bh only in 2HDM] low rate, complex final state large t t+jets background accessible gg t th

12 t W,Z Big moment of little channels [Zeppenfeld et al; Dührssen et al; SFitter 29] assume narrow resonance with SM-like Lagrangian couplings from production & decay rates measuring g t in g g assumes Standard Model [Georg s talk] little channels crucial b,t W,Z gg H qq qqh gg t th qq VH g x = g SM x (1 + x ) H ZZ H WW H b b H τ + τ H γγ

13 Big moment of little channels [Zeppenfeld et al; Dührssen et al; SFitter 29] assume narrow resonance with SM-like Lagrangian couplings from production & decay rates measuring g t in g g assumes Standard Model [Georg s talk] little channels crucial gg H qq qqh gg t th qq VH g x = g SM x (1 + x ) H ZZ H WW H b b H τ + τ H γγ Not yet including Moriond/Aspen data [SFitter: Klute, Lafaye, TP, Rauch, Zerwas] six couplings from data g W,Z okay g t,b indirectly g τ poor g γ possible poor man s analyses great: H, V, f moving towards Standard Model? 1.5 ICHEP L= (7 TeV) (8 TeV) fb -1, 68% CL: ATLAS + CMS SM exp. SM g x = g x (1+ x ) data data (+ γ ) -1 H V F W Z t b τ γ Z/W τ/b b/w

14 Big moment of little channels [Zeppenfeld et al; Dührssen et al; SFitter 29] assume narrow resonance with SM-like Lagrangian couplings from production & decay rates measuring g t in g g assumes Standard Model [Georg s talk] little channels crucial gg H qq qqh gg t th qq VH g x = g SM x (1 + x ) H ZZ H WW H b b H τ + τ H γγ Not yet including Moriond/Aspen data [SFitter: Klute, Lafaye, TP, Rauch, Zerwas] six couplings from data g W,Z okay g t,b indirectly g τ poor g γ possible hvv h tt h bb mixed-in singlet 6% 6% 6% composite Higgs 8% tens of % tens of % MSSM < 1% 3% depends... poor man s analyses great: H, V, f moving towards Standard Model? expected in BSM models [Gupta, Rzehak, Wells]

15 Big moment of little channels [Zeppenfeld et al; Dührssen et al; SFitter 29] assume narrow resonance with SM-like Lagrangian couplings from production & decay rates measuring g t in g g assumes Standard Model [Georg s talk] little channels crucial gg H qq qqh gg t th qq VH g x = g SM x (1 + x ) H ZZ H WW H b b H τ + τ H γγ Dinosaur extrapolation LHC extrapolations unclear [here: SFitter version] theory extrapolations tricky [here: SFitter version]

16 Big moment of little channels [Zeppenfeld et al; Dührssen et al; SFitter 29] assume narrow resonance with SM-like Lagrangian couplings from production & decay rates measuring g t in g g assumes Standard Model [Georg s talk] little channels crucial gg H qq qqh gg t th qq VH g x = g SM x (1 + x ) H ZZ H WW H b b H τ + τ H γγ Dinosaur extrapolation LHC extrapolations unclear [here: SFitter version] theory extrapolations tricky [here: SFitter version] ILC case obvious [to Sven, Georg, and me] interplay in loop-induced couplings % CL: 3 fb -1, 14 TeV LHC and 5 fb -1, 5 GeV LC 3 fb -1, 14 TeV LHC SM g x = g x (1+ x ) 5 fb -1, 5 GeV LC HL-LHC + LC5 HL-LHC + LC5 ( t c ) H W Z t c b τ γ g

17 Big moment of little channels [Zeppenfeld et al; Dührssen et al; SFitter 29] assume narrow resonance with SM-like Lagrangian couplings from production & decay rates measuring g t in g g assumes Standard Model [Georg s talk] little channels crucial gg H qq qqh gg t th qq VH g x = g SM x (1 + x ) H ZZ H WW H b b H τ + τ H γγ Dinosaur extrapolation LHC extrapolations unclear [here: SFitter version] theory extrapolations tricky [here: SFitter version] ILC case obvious [to Sven, Georg, and me] interplay in loop-induced couplings t th an important little channel at ILC % CL: 3 fb -1, 14 TeV LHC and 5 fb -1, 5 GeV LC 3 fb -1, 14 TeV LHC SM g x = g x (1+ x ) 5 fb -1, 5 GeV LC HL-LHC + LC5 HL-LHC + LC5 ( t c ) H W Z t c b τ γ g

18 Challenges in little channels WBF production and jet veto tough [talks by Andrea and Thomas] VH limited by S/B [talks by Christian and Andrea] t th problems all over [Jochen Cammin s ATLAS thesis] lots of space for new ideas by young people

19 Challenges in little channels WBF production and jet veto tough [talks by Andrea and Thomas] VH limited by S/B [talks by Christian and Andrea] t th problems all over [Jochen Cammin s ATLAS thesis] lots of space for new ideas by young people Example: q q VH, H b b and S/B backgrounds continuum Vb b: p T,bb > m H top pairs: jet veto qg Zg Z (b b) effectively 2 2 gg Zb b really 2 3 qg Zqb b really 2 4

Challenges in little channels WBF production and jet veto tough [talks by Andrea and Thomas] VH limited by S/B [talks by Christian and Andrea] t th problems all over [Jochen Cammin s ATLAS thesis]

20 Challenges in little channels WBF production and jet veto tough [talks by Andrea and Thomas] VH limited by S/B [talks by Christian and Andrea] t th problems all over [Jochen Cammin s ATLAS thesis] lots of space for new ideas by young people Example: q q VH, H b b and S/B backgrounds continuum Vb b: p T,bb > m H top pairs: jet veto qg Zg Z (b b) effectively 2 2 gg Zb b really 2 3 qg Zqb b really 2 4 ATLAS: σ/σ SM > 1.9 [ATLAS-CONF ]

21 Challenges in little channels WBF production and jet veto tough [talks by Andrea and Thomas] VH limited by S/B [talks by Christian and Andrea] t th problems all over [Jochen Cammin s ATLAS thesis] lots of space for new ideas by young people Example: q q VH, H b b and S/B backgrounds continuum Vb b: p T,bb > m H top pairs: jet veto qg Zg Z (b b) effectively 2 2 gg Zb b really 2 3 qg Zqb b really 2 4 ATLAS: σ/σ SM > 1.9 [ATLAS-CONF ]

22 Challenges in little channels WBF production and jet veto tough [talks by Andrea and Thomas] VH limited by S/B [talks by Christian and Andrea] t th problems all over [Jochen Cammin s ATLAS thesis] lots of space for new ideas by young people Example: q q VH, H b b and S/B backgrounds continuum Vb b: p T,bb > m H top pairs: jet veto qg Zg Z (b b) effectively 2 2 gg Zb b really 2 3 qg Zqb b really 2 4 ATLAS: σ/σ SM > 1.9 [ATLAS-CONF ]

23 Challenges in little channels WBF production and jet veto tough [talks by Andrea and Thomas] VH limited by S/B [talks by Christian and Andrea] t th problems all over [Jochen Cammin s ATLAS thesis] lots of space for new ideas by young people Example: q q VH, H b b and S/B backgrounds continuum Vb b: p T,bb > m H top pairs: jet veto qg Zg Z (b b) effectively 2 2 gg Zb b really 2 3 qg Zqb b really 2 4 ATLAS: σ/σ SM > 1.9 [ATLAS-CONF ] CMS: σ/σ SM > 2.5 [CMS-HIG-12-44]

24 Challenges in little channels WBF production and jet veto tough [talks by Andrea and Thomas] VH limited by S/B [talks by Christian and Andrea] t th problems all over [Jochen Cammin s ATLAS thesis] lots of space for new ideas by young people Example: q q VH, H b b and S/B backgrounds continuum Vb b: p T,bb > m H top pairs: jet veto qg Zg Z (b b) effectively 2 2 gg Zb b really 2 3 qg Zqb b really 2 4 ATLAS: σ/σ SM > 1.9 [ATLAS-CONF ] CMS: σ/σ SM > 2.5 [CMS-HIG-12-44]

25 Challenges in little channels WBF production and jet veto tough [talks by Andrea and Thomas] VH limited by S/B [talks by Christian and Andrea] t th problems all over [Jochen Cammin s ATLAS thesis] lots of space for new ideas by young people Example: q q VH, H b b and S/B backgrounds continuum Vb b: p T,bb > m H top pairs: jet veto qg Zg Z (b b) effectively 2 2 gg Zb b really 2 3 qg Zqb b really 2 4 ATLAS: σ/σ SM > 1.9 [ATLAS-CONF ] CMS: σ/σ SM > 2.5 [CMS-HIG-12-44] need to target boosted MC studies and tools

26 Angular correlations in little channels Cabibbo Maksymowicz Dell Aquila Nelson angles for H ZZ [Melnikov etal; Lykken etal; v d Bij etal; Englert, Spannowsky, Takeuchi] Ze Zµ cos θ e = ˆp e ˆp Zµ cos θ µ = ˆp µ ˆp Ze cos θ X = ˆp Ze ˆp beam cos φ e = (ˆp beam ˆp Zµ ) (ˆp Zµ ˆp e ) Ze cos φ = (ˆp e ˆp e + ) (ˆp µ ˆp µ + ) X 1e je + ê z j e e h p Z p X ê z? ` Z p p µ µ µ µ + +

27 Angular correlations in little channels Cabibbo Maksymowicz Dell Aquila Nelson angles for H ZZ [Melnikov etal; Lykken etal; v d Bij etal; Englert, Spannowsky, Takeuchi] Breit frame or hadron collider (η, φ) in WBF [Breit: boost into space-like] [Rainwater, TP, Zeppenfeld; Hagiwara, Li, Mawatari; Englert, Mawatari, Netto, TP]

28 Angular correlations in little channels Cabibbo Maksymowicz Dell Aquila Nelson angles for H ZZ [Melnikov etal; Lykken etal; v d Bij etal; Englert, Spannowsky, Takeuchi] Breit frame or hadron collider (η, φ) in WBF [Breit: boost into space-like] [Rainwater, TP, Zeppenfeld; Hagiwara, Li, Mawatari; Englert, Mawatari, Netto, TP] cos θ 1 = ˆp j1 ˆp V2 cos θ 2 = ˆp j2 ˆp V1 V1 Breit V2 Breit cos φ 1 = (ˆp V2 ˆp d ) (ˆp V2 ˆp j1 ) V1 Breit cos φ = (ˆp q1 ˆp j1 ) (ˆp q2 ˆp j2 ). X cos θ = ˆp V1 ˆp d X 1 ( Q V 1 d j 1 V 2 Q (? j 2 2

29 Angular correlations in little channels Cabibbo Maksymowicz Dell Aquila Nelson angles for H ZZ [Melnikov etal; Lykken etal; v d Bij etal; Englert, Spannowsky, Takeuchi] Breit frame or hadron collider (η, φ) in WBF [Breit: boost into space-like] [Rainwater, TP, Zeppenfeld; Hagiwara, Li, Mawatari; Englert, Mawatari, Netto, TP] cos θ 1 = ˆp j1 ˆp V2 cos θ 2 = ˆp j2 ˆp V1 V1 Breit V2 Breit cos φ 1 = (ˆp V2 ˆp d ) (ˆp V2 ˆp j1 ) V1 Breit cos φ = (ˆp q1 ˆp j1 ) (ˆp q2 ˆp j2 ). X cos θ = ˆp V1 ˆp d X dγ Γ d φ.4 1 dσ σ d φ.4 1 dσ σ d φ jj + D D5.3 - D5 + SM.2 - D D5.2 + SM.1 + D SM

30 Angular correlations in little channels Cabibbo Maksymowicz Dell Aquila Nelson angles for H ZZ [Melnikov etal; Lykken etal; v d Bij etal; Englert, Spannowsky, Takeuchi] Breit frame or hadron collider (η, φ) in WBF [Breit: boost into space-like] [Rainwater, TP, Zeppenfeld; Hagiwara, Li, Mawatari; Englert, Mawatari, Netto, TP] cos θ 1 = ˆp j1 ˆp V2 cos θ 2 = ˆp j2 ˆp V1 V1 Breit V2 Breit cos φ 1 = (ˆp V2 ˆp d ) (ˆp V2 ˆp j1 ) V1 Breit cos φ = (ˆp q1 ˆp j1 ) (ˆp q2 ˆp j2 ). X cos θ = ˆp V1 ˆp d X dγ Γ d φ.4 1 dσ σ d φ.4 1 dσ σ d φ jj + D D5.3 - D5 + SM.2 - D D5.2 + SM.1 + D SM different channels, same physics

31 Spin-2 test? [Englert, Mawatari, Netto, TP] unitarization affecting all energy variables try Gottfried-Jackson angle [ˆp X,lab vs ˆp d,x ; Frank, Rauch, Zeppenfeld; Schumacher] 1.8 dσ σ 1 dcosθ* X τ τ X γ γ X γ γ + 2EW+q + 2 EW+q + 2 EW 1.8 dσ σ 1 dcosθ GJ X τ τ X γ γ X γ γ + 2EW+q + 2 EW+q + 2 EW cosθ* cosθ GJ

32 Spin-2 test? [Englert, Mawatari, Netto, TP] unitarization affecting all energy variables try Gottfried-Jackson angle [ˆp X,lab vs ˆp d,x ; Frank, Rauch, Zeppenfeld; Schumacher] alternatively φ 1 + φ 2 after unitarization [Hagiwara, Li, Mawatari] EW + 2EW+q + 2QCD Φ Φ +

33 Spin-2 test? [Englert, Mawatari, Netto, TP] unitarization affecting all energy variables try Gottfried-Jackson angle [ˆp X,lab vs ˆp d,x ; Frank, Rauch, Zeppenfeld; Schumacher] diagrammatic analysis for WBF [ η jj useful] many observables, avoid cutting on them

34 Fox-Wolfram moments Weighted series in spherical harmonics [Field, Kanev, Tayebnejad; Bernaciak, Buschmann, Butter, TP] originally alternative to event shapes H T l = 4π l N Y m l 2l + 1 (Ω i ) p 2 T,i N p T,i p T,j = p m= l i=1 T,tot p 2 P l (cos Ω ij ), i,j=1 T,tot defined on separated jets for a start H 1 H Ω[π] r Ω[π] r H 5 H Ω[π] r Ω[π] r H l <.3.3 < H l <.7.7 < H l < 1 even l forbidden democratic ordered, collinear, back-to-back odd l back-to-back democratic collinear, ordered

35 Fox-Wolfram moments Weighted series in spherical harmonics [Field, Kanev, Tayebnejad; Bernaciak, Buschmann, Butter, TP] originally alternative to event shapes H T l = 4π l N Y m l 2l + 1 (Ω i ) p 2 T,i N p T,i p T,j = p m= l i=1 T,tot p 2 P l (cos Ω ij ), i,j=1 T,tot defined on separated jets for a start applied to tagging jets in WBF [m jj > 6 GeV] N 1 dn T dh N 1 dn T dh N 1 dn T dh T 1 H T H T 1 H 8

36 Fox-Wolfram moments Weighted series in spherical harmonics [Field, Kanev, Tayebnejad; Bernaciak, Buschmann, Butter, TP] originally alternative to event shapes H T l = 4π l N Y m l 2l + 1 (Ω i ) p 2 T,i N p T,i p T,j = p m= l i=1 T,tot p 2 P l (cos Ω ij ), i,j=1 T,tot defined on separated jets for a start applied to tagging jets in WBF [m jj > 6 GeV] applied to all jets in WBF N 1 dn T dh N 1 dn T dh N 1 dn T dh T H T H T H 1 8

37 Fox-Wolfram moments Weighted series in spherical harmonics [Field, Kanev, Tayebnejad; Bernaciak, Buschmann, Butter, TP] originally alternative to event shapes H T l = 4π l N Y m l 2l + 1 (Ω i ) p 2 T,i N p T,i p T,j = p m= l i=1 T,tot p 2 P l (cos Ω ij ), i,j=1 T,tot defined on separated jets for a start applied to tagging jets in WBF [m jj > 6 GeV] applied to all jets in WBF applied to all jets after WBF cuts.2.1 N 1 dn T dh N 1 dn T dh N 1 dn T dh T 1 H T 1 H T H 1 8

38 Fox-Wolfram moments Weighted series in spherical harmonics [Field, Kanev, Tayebnejad; Bernaciak, Buschmann, Butter, TP] originally alternative to event shapes H T l = 4π l N Y m l 2l + 1 (Ω i ) p 2 T,i N p T,i p T,j = p m= l i=1 T,tot p 2 P l (cos Ω ij ), i,j=1 T,tot defined on separated jets for a start applied to tagging jets in WBF [m jj > 6 GeV] applied to all jets in WBF applied to all jets after WBF cuts useful information left tuned resolution via variable l adjust weight factor? adjust objects entering FWMs? [not too correlated]

39 Fox-Wolfram moments Weighted series in spherical harmonics [Field, Kanev, Tayebnejad; Bernaciak, Buschmann, Butter, TP] originally alternative to event shapes H T l = 4π l N Y m l 2l + 1 (Ω i ) p 2 T,i N p T,i p T,j = p m= l i=1 T,tot p 2 P l (cos Ω ij ), i,j=1 T,tot defined on separated jets for a start applied to tagging jets in WBF [m jj > 6 GeV] applied to all jets in WBF applied to all jets after WBF cuts useful information left tuned resolution via variable l adjust weight factor? adjust objects entering FWMs? might be useful eventually [not too correlated]

40 Outlook discovery an amazing experimental success confirmation of field theory as a universal framework little channels will make the difference [where are the great papers by youngsters??] 13+ TeV needed for WBF, VH, t th good ideas welcome/needed for little searches Higgs measurement era incredible! Much of this work was funded by the BMBF Theorie-Verbund which is ideal for hard and relevant LHC work

Higgs Couplings. Tilman Plehn. Standard 4/2013. Higgs Couplings. Tilman Plehn. Results. Channels. Higgs couplings.

Higgs Couplings. Tilman Plehn. Standard 4/2013. Higgs Couplings. Tilman Plehn. Results. Channels. Higgs couplings. Higgs Couplings Universität Heidelberg Standard Model@LHC, 4/213 Higgs physics 213-2XX Fundamental questions 1 What is the Higgs Lagrangian? [Maggie s talk] Higgs physics 213-2XX Fundamental questions