On the behaviour of composite resonances breaking LFU Mikael Chala - - PowerPoint PPT Presentation

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On the behaviour of composite resonances breaking LFU Mikael Chala - - PowerPoint PPT Presentation

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On the behaviour of composite resonances breaking LFU Mikael Chala (IPPP) With M. Spannowsky. arXiv:1803.02364 MC4BSM, IPPP Durham, April 21, 2018 Several hints of violation of lepton fmavor universality, in particular: MC4BSM, IPPP Durham,

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On the behaviour of composite resonances breaking LFU

Mikael Chala (IPPP)

With M. Spannowsky. arXiv:1803.02364

MC4BSM, IPPP Durham, April 21, 2018

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MC4BSM, IPPP Durham, April 21, 2018

Several hints of violation

  • f lepton fmavor universality,

in particular:

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MC4BSM, IPPP Durham, April 21, 2018

Several hints of violation

  • f lepton fmavor universality,

in particular:

  • Very clean observable
  • Below SM prediction

in several measurements

  • Very clean observable
  • Below SM prediction

in several measurements

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MC4BSM, IPPP Durham, April 21, 2018

Several hints of violation

  • f lepton fmavor universality,

in particular:

  • Very clean observable
  • Below SM prediction

in several measurements

  • Very clean observable
  • Below SM prediction

in several measurements

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MC4BSM, IPPP Durham, April 21, 2018

Several hints of violation

  • f lepton fmavor universality,

in particular:

  • Very clean observable
  • Below SM prediction

in several measurements

  • Very clean observable
  • Below SM prediction

in several measurements few TeV size, so natural in other models of new physics (e.g. Composite Higgs models)

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MC4BSM, IPPP Durham, April 21, 2018

The simplifjed Lagrangian

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MC4BSM, IPPP Durham, April 21, 2018

The simplifjed Lagrangian

Larger values in confmict with neutrino trident production. Smaller values disfavoured by [L. Di Luzio,

  • M. Kirk, and A. Lenz; '17]
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MC4BSM, IPPP Durham, April 21, 2018

The simplifjed Lagrangian

Larger values in confmict with neutrino trident production. Smaller values disfavoured by [L. Di Luzio,

  • M. Kirk, and A. Lenz; '17]
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MC4BSM, IPPP Durham, April 21, 2018

The origin of these couplings in composite Higgs models

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MC4BSM, IPPP Durham, April 21, 2018

The origin of these couplings in composite Higgs models

1503.03865 1508.00569 1510.07658 1608.02362 1611.03507 1703.06019 1712.07646 1712.02536

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IR UV GeV scale

The composite Higgs paradigm

(a high-energy copy of QCD)

MC4BSM, IPPP Durham, April 21, 2018

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IR UV GeV scale

The composite Higgs paradigm

(a high-energy copy of QCD) quark condensate

MC4BSM, IPPP Durham, April 21, 2018

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IR UV GeV scale

The composite Higgs paradigm

(a high-energy copy of QCD) quark condensate

MC4BSM, IPPP Durham, April 21, 2018

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IR UV GeV scale

The composite Higgs paradigm

(a high-energy copy of QCD) quark condensate

MC4BSM, IPPP Durham, April 21, 2018

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IR UV TeV scale

The composite Higgs paradigm

(a high-energy copy of QCD)

MC4BSM, IPPP Durham, April 21, 2018

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IR UV TeV scale

The composite Higgs paradigm

(a high-energy copy of QCD)

MC4BSM, IPPP Durham, April 21, 2018

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IR UV TeV scale

The composite Higgs paradigm

(a high-energy copy of QCD) parton condensate

MC4BSM, IPPP Durham, April 21, 2018

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IR UV TeV scale

The composite Higgs paradigm

(a high-energy copy of QCD) parton condensate

MC4BSM, IPPP Durham, April 21, 2018

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IR UV TeV scale

The composite Higgs paradigm

(a high-energy copy of QCD) parton condensate

MC4BSM, IPPP Durham, April 21, 2018

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IR UV TeV scale

The composite Higgs paradigm

(a high-energy copy of QCD) parton condensate

MC4BSM, IPPP Durham, April 21, 2018

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IR UV TeV scale

The composite Higgs paradigm

(a high-energy copy of QCD) parton condensate

True for all composite resonances!

MC4BSM, IPPP Durham, April 21, 2018

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MC4BSM, IPPP Durham, April 21, 2018

The origin of these couplings in composite Higgs models

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MC4BSM, IPPP Durham, April 21, 2018

The origin of these couplings in composite Higgs models

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MC4BSM, IPPP Durham, April 21, 2018

The origin of these couplings in composite Higgs models

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MC4BSM, IPPP Durham, April 21, 2018

The origin of these couplings in composite Higgs models

Breaks the shift symmetry Must be small, so M must be small too

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MC4BSM, IPPP Durham, April 21, 2018

The origin of these couplings in composite Higgs models

Breaks the shift symmetry Must be small, so M must be small too

So, this channel is open! It dominates the decay width!

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MC4BSM, IPPP Durham, April 21, 2018

Current bounds on vector-like fermions

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Heavy quarks are produced in pairs via QCD (no model dependence)

MC4BSM, IPPP Durham, April 21, 2018

Current bounds on vector-like fermions

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This is strongly infmuenced by the minimal composite Higgs

  • model. In non-minimal composite Higgs models:

4d UV completions, DM, BAU, … and most models are non-minimal!

MC4BSM, IPPP Durham, April 21, 2018

Current bounds on vector-like fermions

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This is strongly infmuenced by the minimal composite Higgs

  • model. In non-minimal composite Higgs models:

[MC, 1705.03013]

4d UV completions, DM, BAU, … and most models are non-minimal!

MC4BSM, IPPP Durham, April 21, 2018

Current bounds on vector-like fermions

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Heavy leptons are produced in pairs via EW interactions, so much weaker constraints [1306.1525], [1007.4206]

MC4BSM, IPPP Durham, April 21, 2018

Current bounds on vector-like fermions

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MC4BSM, IPPP Durham, April 21, 2018

The origin of these couplings in composite Higgs models

Breaks the shift symmetry Must be small, so M must be small too

So, this channel is open! It dominates the decay width!

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MC4BSM, IPPP Durham, April 21, 2018

The actual reach of di-muon searches

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The actual reach of di-muon searches

MC4BSM, IPPP Durham, April 21, 2018

Naive di-muon bound (neglecting heavy fermions)

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The actual reach of di-muon searches

MC4BSM, IPPP Durham, April 21, 2018

Naive di-muon bound (neglecting heavy fermions) Actual di-muon bound

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The actual reach of di-muon searches

MC4BSM, IPPP Durham, April 21, 2018

almost one order

  • f magnitude

Naive di-muon bound (neglecting heavy fermions) Actual di-muon bound

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MC4BSM, IPPP Durham, April 21, 2018

Leptonic Z decay gives very few events, so we consider hadronic decays of:

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MC4BSM, IPPP Durham, April 21, 2018

Event selection

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MC4BSM, IPPP Durham, April 21, 2018

Event selection

Muons with pT > 50 GeV removed from hadrons in clustering process

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MC4BSM, IPPP Durham, April 21, 2018

Event selection

Muons with pT > 50 GeV removed from hadrons in clustering process Jets are clustered with R = 1.2

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MC4BSM, IPPP Durham, April 21, 2018

Event selection

Muons with pT > 50 GeV removed from hadrons in clustering process Jets are clustered with R = 1.2 We require, fjrst, the presence of exactly two opposite charged muons and at least one jet

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MC4BSM, IPPP Durham, April 21, 2018

Event selection

Muons with pT > 50 GeV removed from hadrons in clustering process Jets are clustered with R = 1.2 We require, fjrst, the presence of exactly two opposite charged muons and at least one jet

The leading pT jet is required to have a signifjcant mass

  • drop. It is then fjltered
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MC4BSM, IPPP Durham, April 21, 2018

Event selection

Muons with pT > 50 GeV removed from hadrons in clustering process Jets are clustered with R = 1.2 We require, fjrst, the presence of exactly two opposite charged muons and at least one jet

The leading pT jet is required to have a signifjcant mass

  • drop. It is then fjltered

0802.2470

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MC4BSM, IPPP Durham, April 21, 2018

Event selection

Muons with pT > 50 GeV removed from hadrons in clustering process Jets are clustered with R = 1.2 We require, fjrst, the presence of exactly two opposite charged muons and at least one jet

The leading pT jet is required to have a signifjcant mass

  • drop. It is then fjltered
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MC4BSM, IPPP Durham, April 21, 2018

Event selection

Muons with pT > 50 GeV removed from hadrons in clustering process Jets are clustered with R = 1.2 We require, fjrst, the presence of exactly two opposite charged muons and at least one jet

The leading pT jet is required to have a signifjcant mass

  • drop. It is then fjltered
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MC4BSM, IPPP Durham, April 21, 2018

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MC4BSM, IPPP Durham, April 21, 2018

Event selection

pT muons above 200 GeV, leading jet mass in the range [80, 130] GeV

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MC4BSM, IPPP Durham, April 21, 2018

Event selection

pT muons above 200 GeV, leading jet mass in the range [80, 130] GeV

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MC4BSM, IPPP Durham, April 21, 2018

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MC4BSM, IPPP Durham, April 21, 2018

Event selection

We can then cut on mV and mL:

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MC4BSM, IPPP Durham, April 21, 2018

Event selection

We can then cut on mV and mL:

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MC4BSM, IPPP Durham, April 21, 2018

Event selection

We can then cut on mV and mL:

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MC4BSM, IPPP Durham, April 21, 2018

Final results

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MC4BSM, IPPP Durham, April 21, 2018

Final results

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MC4BSM, IPPP Durham, April 21, 2018

Final results

Assumes half of the cross section into the target fjnal state

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Parameter space regions that were thought excluded by searches for di-muon resonances, are still allowed. They are not even ruled out by other beyond the Standard Model analyses, including multi-lepton searches for electroweakinos

  • r heavy leptons.

MC4BSM, IPPP Durham, April 21, 2018

Conclusions

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Parameter space regions that were thought excluded by searches for di-muon resonances, are still allowed. They are not even ruled out by other beyond the Standard Model analyses, including multi-lepton searches for electroweakinos

  • r heavy leptons.

Some of the allowed regions can already be probed at the 95 % CL with our dedicated analysis.

MC4BSM, IPPP Durham, April 21, 2018

Conclusions

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Parameter space regions that were thought excluded by searches for di-muon resonances, are still allowed. They are not even ruled out by other beyond the Standard Model analyses, including multi-lepton searches for electroweakinos

  • r heavy leptons.

Some of the allowed regions can already be probed at the 95 % CL with our dedicated analysis. With more luminosity, e.g. 300/fb (3000/fb), heavier resonances can be tested, e.g. mV = 2 (3) TeV.

MC4BSM, IPPP Durham, April 21, 2018

Conclusions