dihiggs production and new physics - lal events directory ......higgs hunting 2015 - 31.7.2015...
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Florian GoertzFlorian Goertz CERNCERN
DiHiggs Production and DiHiggs Production and New Physics New Physics
Higgs Hunting 2015Higgs Hunting 2015OrsayOrsay
31.7.201531.7.2015
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 2
New Physics (in DiHiggs)
Many hints and evidences for NP!● Gravity● Hierarchy Problem● Neutrino Masses (See Saw)● Grand Unification of Forces● Flavor Structure● Baryogenesis● Dark Matter● Trigger for Symmetry-Breaking Potential?● Strong CP Problem● Hints in Flavor/Precision Measurements?● …
How to get access to NP?
Probe our current understanding of the fundamental laws of nature ...
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 3
New Physics (in DiHiggs)
Many hints and evidences for NP!● Gravity● Hierarchy Problem● Neutrino Masses (See Saw)● Grand Unification of Forces● Flavor Structure● Baryogenesis● Dark Matter● Trigger for Symmetry-Breaking Potential?● Strong CP Problem● Hints in Flavor/Precision Measurements?● …
Probe our current understanding of the fundamental laws of nature ...
● Many links to Higgs Sector
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 4
The Higgs Sector... … offers a unique window to NP
Properties of the Higgs Boson? Scale of New Physics?
One of the biggest discoveries of mankind
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 5
The Higgs PotentialVery important test of SM/NP: Higgs potentialHiggs potential self couplings
EWSB:
● Vacuum Stability● Origin of the Potential (↔ flavor)● Dark Matter● Portal● Baryogenesis● Hierarchy Problem → see later● ...
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 6
The Higgs PotentialVery important test of SM/NP: Higgs potentialHiggs potential self couplings
SM:
● Vacuum Stability● Origin of the Potential (↔ flavor)● Dark Matter● Portal● Baryogenesis● Hierarchy Problem → see later● ...
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 7
The Higgs Potential
established @LHC
Very important test of SM/NP: Higgs potentialHiggs potential self couplings
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 8
The Higgs Potential
accessible in Higgs pair production
Very important test of SM/NP: Higgs potentialHiggs potential self couplings
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 9
The Higgs Potential
Triple Higgs production: extremely challenging @(V)LHC0.06 fb @LHC14; 9.45 fb @VLHC (200 TeV)
Plehn, Rauch, hep-ph/0507321
accessible in Higgs pair production
Very important test of SM/NP: Higgs potentialHiggs potential self couplings
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 10
Higgs-Pair Production in the SM (LO)
See e.g. Plehn, Spira, Zerwas ph/9603205
spin-0 spin-2
Eboli, Marques, Novaes, Natale, PLB 197(1987)269 Glover, van der Bij, NPB 309(1988)282de Florian, Mazzitelli, 1305.5206, 1309.6594see also Maltoni, Vryonidou, Zaro, 1408.6542
' - '
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 11
Different Decay Channels
Baur, Plehn, Rainwater, hep-ph/0310056
Dolan, Englert, Spannowsky, 1206.5001
Papaefstathiou, Yang, Zurita, 1209.1489
Expected Significance @ 600 fb-1 (SM)
(S/B=6/12)
(S/B=57/119)
(S/B=12/8)
Butterworth, Davison, Rubin, Salam, 0802.2470
Theorists' analyses!
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 12
The Higgs Potential
Most stringent projected constraint on alone @ LHC14 FG, Papaefstathiou, Yang, Zurita 1301.3492; 1309.3805
Baur, Plehn, Rainwater, hep-ph/0211224, hep-ph/0310056Dolan, Englert, Spannowski 1206.5001Baglio, Djouadi, Gröber, Mühlleitner, Quevillon, Spira 1212.5581
...
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 13
New Physics in hh Production● SUSY ● Composite Higgs
● etc...
SMSMhh=0=0
elementarycomposite
CFTCFT
Gillioz, Grober, Grojean, Muhlleitner, Salvioni, 1206.7120,Contino, Grojean, Moretti, Piccinini, Rattazzi, 1002.1011,Grober, Muhlleitner, 1012.1562,Contino, Ghezzi, Moretti, Panico, Piccinini, Wulzer, 1205.5444, ...
...
Plehn, Spira, Zerwas, ph/9603205,Djouadi, Kilian, Muhlleitner, Zerwas, ph/9904287, Lafaye, Miller, Muhlleitner, Moretti, ph/0002238,Cao, Heng, Shang, Wan, Yang, 1301.6437, ...
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 14
'Model Independent' Approach to NP● If NP resides at high scale E>>MEW , can be described by operators with , independently of the concrete theory that completes the SM!
c.f. Fermi Theory
MEW
NP
SM
local operators built of SM field content, respecting gauge symmetries= New Physics
Weinberg, Wilson, Callen, Coleman, Wess, Zumino, ...
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 15
Physics Beyond the SM
MEW
● If NP resides at high scale E>>MEW , can be described by operators with , independently of the concrete theory that completes the SM!
A lot of room for new physics!
Effects scale like → suppressed by mass scale
of heavy new physics[leading effects: D=6, D=8 further suppressed]
SM as IR limit, expected to work perfectly well at low E - new fundamental theory takes over at large E
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 16
● Full set of non-redundant operators (i.e., basis): 59 D=6 operators (2499 including full flavor structure)
Buchmuller, Wyler, NPB 268(1986)621–653Grzadkowski, Iskrzynski, Misiak, Rosiek, 1008.4884Alonso, Jenkins, Manohar, Trott, 1312.2014
EFT Approach to New Physics
[assuming B&L conservation]
● Constrain coefficients of these operators[One way to go, given the lack of evidence in favor of concrete models]
For non-linear realization, see Grinstein, Trott 0704.1505 Contino, Grojean, Moretti, Piccinini, Rattazzi 1002.1011
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 17
Higgs Boson EFT● Neglecting operators strongly constrained from precision tests
See e.g.: Elias-Miro, Espinosa, Masso, Pomarol, 1308.1879; Pomarol, Riva, 1308.2803; Corbett, Eboli, Gonzalez-Fraile, Gonzalez-Garcia 1207.1344, 1211.4580, 1304.1151; Falkowski, Riva, Urbano, 1303.1812; Contino, Ghezzi, Grojean, Muhlleitner, Spira, 1303.3876; Dumont, Fichet, von Gersdorff 1304.3369; Trott 1409.7605; Falkowski, Riva, 1411.0669; Corbett, Eboli, Goncalves, Gonzalez-Fraile, Plehn, Rauch 1505.05516; HXSWG; ...
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 18
Higgs Boson EFT● Neglecting operators strongly constrained from precision tests
Pure HiggsYukawa type
See e.g.: Elias-Miro, Espinosa, Masso, Pomarol, 1308.1879; Pomarol, Riva, 1308.2803; Corbett, Eboli, Gonzalez-Fraile, Gonzalez-Garcia 1207.1344, 1211.4580, 1304.1151; Falkowski, Riva, Urbano, 1303.1812; Contino, Ghezzi, Grojean, Muhlleitner, Spira, 1303.3876; Dumont, Fichet, von Gersdorff 1304.3369; Trott 1409.7605; Falkowski, Riva, 1411.0669; Corbett, Eboli, Goncalves, Gonzalez-Fraile, Plehn, Rauch 1505.05516; HXSWG; ...
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 19
Higgs Boson EFT● Neglecting operators strongly constrained from precision tests
Basically unconstrainable from single-Higgs physics:→ enters Higgs potential self couplings
See e.g.: Elias-Miro, Espinosa, Masso, Pomarol, 1308.1879; Pomarol, Riva, 1308.2803; Corbett, Eboli, Gonzalez-Fraile, Gonzalez-Garcia 1207.1344, 1211.4580, 1304.1151; Falkowski, Riva, Urbano, 1303.1812; Contino, Ghezzi, Grojean, Muhlleitner, Spira, 1303.3876; Dumont, Fichet, von Gersdorff 1304.3369; Trott 1409.7605; Falkowski, Riva, 1411.0669; Corbett, Eboli, Goncalves, Gonzalez-Fraile, Plehn, Rauch 1505.05516; HXSWG; ...
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 20
The Higgs Potential enters Higgs potential self couplings
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 21
The Higgs Potential enters Higgs potential self couplings
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 22
The Higgs Potential
Challenge: Many more operators contribute to gg→hh
accessible in Higgs pair production:
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 23
gg → hh in D=6 EFT
Pure HiggsYukawa type
gg → hh new diagrams
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 24
gg → hh Cross Section in D=6 EFT
Implemented in MC generator Herwig++Normalize to NNLO: de Florian, Mazzitelli, 1309.6594
FG, Papaefstathiou, Yang, Zurita, 1410.3471
see also Azatov, Contino, Panico, Son, 1502.00539 NLO: Gröber, Mühlleitner, Spira, Streicher, 1504.06577
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 25
Higgs Decays in D=6 EFT
Loop + 1/ suppressed wrt SM
Bold coefficients included in FG, Papaefstathiou, Yang, Zurita, 1410.3471 Don't include suppressed (loop) operators in loop topologies
...
6 Parameters:Unique accessibility in hh production! @LHC14
Focus on
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 26
→hh Cross Section in EFTgg
MSTW2008nlo_nf4 PDF● Effect of varying individual Wilson coefficients● Dashed: parameter-range excluded from current h data at the LHC
→ used HiggsBounds, HiggsSignals on cross sections calculated via eHDECAY
Bechtle et.al., 1311.0055, 1305.1933
FG, Papaefstathiou, Yang, Zurita, 1410.3471
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 27
MC generator important for analysis → describe distributions, which determine efficiencies
→hh after cutsggEfficiency
ci=0.5
FG, Papaefstathiou, Yang, Zurita, 1410.3471
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 28
MC generator important for analysis → describe distributions, which determine efficiencies
→hh after cutsggEfficiency Cross Section
FG, Papaefstathiou, Yang, Zurita, 1410.3471
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 29
Expected Constraints after full analysis: ct-c6
● Clear correlation visible: Enhanced hh cross section due to negative ct can be compensated by reduction due to positive c
● Consider● Marginalize over other
directions within projected ranges
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 30
● Precise knowledge on ‘top Yukawa’ ct helpful to improve the range for c6 ● On the other hand, could also obtain meaningful information on ct in hh
Expected Constraints after full analysis: ct-c6
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 31
● Precise knowledge on ‘top Yukawa’ ct helpful to improve the range for c6 ● On the other hand, could also obtain meaningful information on ct in hh
Expected Constraints after full analysis: ct-c6
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 32
● Precise knowledge on ‘top Yukawa’ ct helpful to improve the range for c6 ● On the other hand, could also obtain meaningful information on ct in hh
Expected Constraints after full analysis: ct-c6
hh
tth
Azatov, Contino, Panico, Son, 1502.00539
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 33
Expected Constraints after full analysis
● In general significant correlationsSee also Azatov, Contino, Panico, Son, 1502.00539
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 34
Final ResultsExpected 1 constraints at the 14 TeV LHC, assuming fth = 30%
● Use real p-values from current single Higgs measurements in marginalization:
FG, Papaefstathiou, Yang, Zurita, 1410.3471
See also Azatov, Contino, Panico, Son, 1502.00539 (bb)
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 35
Presence of 2
● : only relevant operator in SM● Origin of hierarchy problem● Have so far not tested if actually there!
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 36
Presence of 2
● : only relevant operator in SM● Origin of hierarchy problem● Have so far not tested if actually there!
● Fully replace term by D=6 operator● <0, EWSB not triggered by negative 2 term● 2=0 really possible by adding D=6 op. in consistent EFT ??
FG, 1504.00355
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 37
Presence of 2
● Yes, due to the lightness of the Higgs Boson
SM one-loop CW → small correction: FG, 1504.00355
FG, 1504.00355
Limits from EWPT → see Grojean, Servant, Wells, hep-ph/0407019
appropriate 1st order PT possible
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 38
less SM testable at LHC
● Use real p-values from current single Higgs measurements in marginalization:
conventions of GPYZ, 1410.3471 incl. CW shift
14TeV LHC, 1
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 39
Enhance Sensitivity: Consider Distributions
● Optimize Analysis to Kinematical Properties Dall'Osso, Dorigo, FG, Gottardo, Oliveira, Tosi, , 1507.02245
● Cluster parameter space wrt expected distributions
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 40
Enhance Sensitivity: Consider Distributions
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 41
The Higgs discovery is not the end, it is just the beginning.
● Higgs sector still contains many mysteries ● Analysis of hh production → unique insight on structure of (D=6) extension of SM!
Conclusions
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 42
Backup
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 43
Backup: The Higgs Potential enters after canonical normalization of kinetics
removes also momentum-dependent interactions
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 44
Backup: → hhggEWSB → Relevant Terms:
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 45
Backup: HH Production: MCHM5
● Important contribution:
Gillioz, Grober, Grojean, Muhlleitner, Salvioni, 1206.7120See also Contino, Ghezzi, Moretti, Panico, Piccinini, Wulzer, 1205.5444
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 46
Backup: Explicit Analysis● Focus on
Dolan, Englert, Spannowsky, 1206.5001Baglio, Djouadi, Grober, Muhlleitner, Quevillon; 1212.5581Barr, Dolan, Englert, Spannowsky,, 1309.6318 Maierhoefer, Papaefstathiou, 1401.0007
@LHC14
Baur, Plehn, Rainwater, hep-ph/0310056
Dolan, Englert, Spannowsky, 1206.5001
Papaefstathiou, Yang, Zurita, 1209.1489
Significance @ 600 fb-1 (SM)(S/B=6/12)
(S/B=57/119)
(S/B=12/8)
Butterworth, Davison, Rubin, Salam, 0802.2470
Theorists' analyses!
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 47
Backup: Analysis
● Main backgrounds:
Cuts:
see: Dolan, Englert, Spannowsky, 1206.5001;Maierhoefer, Papaefstathiou, 1401.0007
btagging efficiencies: 70 %
Butterworth, Davison, Rubin, Salam, 0802.2470
Generated with aMC@NLO (+ HERWIG++)
Frixione et. al.,, 1010.0568Frederix et. al., 1104.5613Alwall et. al., 1405.0301
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 48
Backup: Analysis● Start with model where only (unconstrained from single h)
Vary only as in previous studies)
30% ~ 10% (scale) + 10% (pdf s) + 10% (mt )
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 49
● Expected constraint on c6, assuming the SM to be true (c6=0):
● Start with model where only (unconstrained from single h)
Vary only as in previous studies)
Backup: Analysis
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 50
region more challenging as cross section reduced → larger uncertainty
Backup: Analysis
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 51
Backup: Full D=6 Theory● Again assume SM (ci=0) and calculate distance of predicted from in units of
● Show results in 2D grids (c6, ci), i=H,g,,t,b
● Marginalize over other directions with a Gaussian weight, ● given by projected errors on the coefficients from single h
(~10% @ (600-3000) fb-1) in the future use real constraints (like p-values from HiggsBounds/Signals)
● Draw iso-contours corresponding to probability-drop of 1
●
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 52
Backup: cg-c6
● Again compensation of effects from different operators possible → range for c6 depends significantly on other coefficients
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 53
Backup: c-c6
● As expected: negligible dependence on c
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 54
Backup: (cb=c)-c6
● Reduced BR due (cb=c)<0 to can be compensated by enhanced production cross section due to negative c6 and vice versa
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 55
Backup: cH-c6
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 56
Backup: cH-c6
● Marginalize over other directions with currentcurrent p-values for coefficients from single-h measurements (using HiggsBounds/Signals)
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 57
Backup: cH-c6
● Precise knowledge of other Wilson coefficients necessary for reasonable bounds on c6
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 58
Backup: Full Marginalization c→ 6
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 59
Backup: hh @LHC● Other production channels
~10-30 times smaller (neglect in the following)
See [e.g.] Baglio, Djouadi, Grober, Muhlleitner, Quevillon, Spira, 1212.5581, and refs. therein
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 60
LHC@14TeV mh ~125 GeV
Theoretical error (NNLO): fth ~ 10% (scale) + 10% (pdf s) + 10% (mt )
Backup: hh @ LHC
-1
● Most important mechanism:
Eboli, Marques, Novaes, Natale, PLB 197(1987)269 Glover, van der Bij, NPB 309(1988)282Dawson, Dittmaier, Spira, PRD 58(1998)115012Grigo, Hoff, Melnikov, Steinhauser, 1305.7340de Florian, Mazzitelli, 1305.5206, 1309.6594see also Maltoni, Vryonidou, Zaro, 1408.6542
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 61
Backup: hh @ LHC● Most important mechanism:
SM: destructive Interf.
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 62
Backup: Hbounds/Signals Ranges
assuming gaussian distributions
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 63
Backup: Parameter-Space Scan● Show results in 2D grids (c6, ci), i=H,g,,t,b● Marginalize over other directions, varying the coefficients in the 95% CL allowed regions, obtained from HiggsBounds/Signals
● Draw iso-contours corresponding to probability-drop of 1
Projections: (~10% effects)
(with a Gaussian weight)
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Higgs Hunting 2015 - 31.7.2015 Florian Goertz 64
Backups: Couplings, Benchmarks, Test Statistics
1