On the interpretation of a possible ~ 750 GeV particle decaying into γγ

Ellis, John; Ellis, Sebastian A. R.; Quevillon, Jeremie; Sanz, Veronica; You, Tevong

doi:10.1007/JHEP03(2016)176

Title: On the interpretation of a possible ~ 750 GeV particle decaying into γγ

Abstract

We consider interpretations of the recent ~3σ reports by the CMS and ATLAS collaborations of a possible X(~ 750 GeV) state decaying into yy final states. We focus on the possibilities that this is a scalar or pseudoscalar electroweak isoscalar state produced by gluon-gluon fusion mediated by loops of heavy fermions. We consider several models for these fermions, including a single vector-like charge 2/3 T quark, a doublet of vector-like quarks (T;B), and a vector-like generation of quarks, with or without leptons that also contribute to the X → yy decay amplitude. We also consider the possibility that X(750) is a dark matter mediator, with a neutral vector-like dark matter particle. These scenarios are compatible with the present and prospective direct limits on vector-like fermions from LHC Runs 1 and 2, as well as indirect constraints from electroweak precision measurements, and we show that the required Yukawa-like couplings between the X particle and the heavy vector-like fermions are small enough to be perturbative so long as the X particle has dominant decay modes into gg and yy. In conclusion, the decays X → ZZ,Zy and W⁺W^- are interesting prospective signatures that may help distinguish between different vector-like fermion scenarios.

Authors:

Ellis, John ^[1]; Ellis, Sebastian A. R. ^[2]; Quevillon, Jeremie ^[3]; Sanz, Veronica ^[4]; You, Tevong ^[5]

King's College London, London (United Kingdom); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
Univ. of Michigan, Ann Arbor, MI (United States)
King's College London, London (United Kingdom)
Univ. of Sussex, Brighton (United Kingdom)
Univ. of Cambridge, Cambridge (United Kingdom)

Publication Date:: Fri Mar 25 00:00:00 EDT 2016

Research Org.:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1326972

Grant/Contract Number:: SC0007859

Resource Type:: Accepted Manuscript

Journal Name:: Journal of High Energy Physics (Online)

Additional Journal Information:: Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2016; Journal Issue: 3; Journal ID: ISSN 1029-8479

Publisher:: Springer Berlin

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; Higgs Physics; Technicolor and Composite Models

Citation Formats


                    Ellis, John, Ellis, Sebastian A. R., Quevillon, Jeremie, Sanz, Veronica, and You, Tevong. On the interpretation of a possible ~ 750 GeV particle decaying into γγ.  United States: N. p., 2016. 
Web.  doi:10.1007/JHEP03(2016)176.

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                    Ellis, John, Ellis, Sebastian A. R., Quevillon, Jeremie, Sanz, Veronica, & You, Tevong. On the interpretation of a possible ~ 750 GeV particle decaying into γγ.  United States.  https://doi.org/10.1007/JHEP03(2016)176

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                    Ellis, John, Ellis, Sebastian A. R., Quevillon, Jeremie, Sanz, Veronica, and You, Tevong. Fri .  
"On the interpretation of a possible ~ 750 GeV particle decaying into γγ".  United States.  https://doi.org/10.1007/JHEP03(2016)176.  https://www.osti.gov/servlets/purl/1326972.

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@article{osti_1326972,

  title        = {On the interpretation of a possible ~ 750 GeV particle decaying into γγ},

  author       = {Ellis, John and Ellis, Sebastian A. R. and Quevillon, Jeremie and Sanz, Veronica and You, Tevong},

  abstractNote = {We consider interpretations of the recent ~3σ reports by the CMS and ATLAS collaborations of a possible X(~ 750 GeV) state decaying into yy final states. We focus on the possibilities that this is a scalar or pseudoscalar electroweak isoscalar state produced by gluon-gluon fusion mediated by loops of heavy fermions. We consider several models for these fermions, including a single vector-like charge 2/3 T quark, a doublet of vector-like quarks (T;B), and a vector-like generation of quarks, with or without leptons that also contribute to the X → yy decay amplitude. We also consider the possibility that X(750) is a dark matter mediator, with a neutral vector-like dark matter particle. These scenarios are compatible with the present and prospective direct limits on vector-like fermions from LHC Runs 1 and 2, as well as indirect constraints from electroweak precision measurements, and we show that the required Yukawa-like couplings between the X particle and the heavy vector-like fermions are small enough to be perturbative so long as the X particle has dominant decay modes into gg and yy. In conclusion, the decays X → ZZ,Zy and W+W- are interesting prospective signatures that may help distinguish between different vector-like fermion scenarios.},

  doi          = {10.1007/JHEP03(2016)176},

  journal      = {Journal of High Energy Physics (Online)},

  number       = 3,

  volume       = 2016,

  place        = {United States},

  year         = {Fri Mar 25 00:00:00 EDT 2016},

  month        = {Fri Mar 25 00:00:00 EDT 2016}

}

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Title: On the interpretation of a possible ~ 750 GeV particle decaying into γγ

Abstract

Citation Formats

Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC journal, September 2012

Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC journal, September 2012

Does the ‘Higgs’ have Spin Zero? journal, September 2012

Distinguishing ‘Higgs’ spin hypotheses using γγ and WW ∗ decays journal, July 2013

On the Use of Subtraction Fields and the Lifetimes of Some Types of Meson Decay journal, October 1949

On Gauge Invariance and Vacuum Polarization journal, June 1951

Axial-Vector Vertex in Spinor Electrodynamics journal, January 1969

A PCAC puzzle: π0→γγ in the σ-model journal, March 1969

Canonical anomalies and broken scale invariance journal, July 1972

Nonperturbative Evaluation of the Anomalies in Low-Energy Theorems journal, May 1972

A phenomenological profile of the Higgs boson journal, January 1976

Search for Scalar Diphoton Resonances in the Mass Range 65–600 GeV with the ATLAS Detector in p p Collision Data at s = 8 TeV journal, October 2014

Search for diphoton resonances in the mass range from 150 to 850 GeV in pp collisions at s = 8 TeV journal, November 2015

Review of Particle Physics journal, August 2014

Supersymmetric standard model spectra from RCFT orientifolds journal, March 2005

A mini-landscape of exact MSSM spectra in heterotic orbifolds journal, February 2007

Light custodians in natural composite Higgs models journal, March 2007

Discovering the composite Higgs through the decay of a heavy fermion journal, July 2012

A first top partner hunter’s guide journal, April 2013

Modified Higgs physics from composite light flavors journal, September 2013

Vector-like bottom quarks in composite Higgs models journal, March 2014

Phenomenology of the little Higgs model journal, May 2003

Collider signatures for new T -parity-odd quarks in little Higgs models journal, May 2007

A fermionic top partner: naturalness and the LHC journal, July 2012

LHC signatures of warped-space vectorlike quarks journal, August 2014

Extra matters decree the relatively heavy Higgs of mass about 125 GeV in the supersymmetric model journal, March 2012

Vector-like fields, messenger mixing and the Higgs mass in gauge mediation journal, May 2014

Gauge mediation models with vectorlike matters at the LHC journal, January 2013

Model-independent bounds on a light Higgs journal, April 2012

Computing decay rates for new physics theories with FeynRules and MadGraph 5_aMC@NLO journal, December 2015

The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations journal, July 2014

MCFM for the Tevatron and the LHC journal, August 2010

NLO Higgs boson production plus one and two jets using the POWHEG BOX, MadGraph4 and MCFM journal, July 2012

The matrix element method at next-to-leading order journal, November 2012

Distinguishing the Higgs Boson from the Dilaton at the Large Hadron Collider journal, March 2008

CP Conservation in the Presence of Pseudoparticles journal, June 1977

Light pseudoscalars, particle physics and cosmology journal, June 1987

Beyond the minimal composite Higgs model journal, April 2009

Composite Higgses with seesaw EWSB journal, December 2015

Search for new phenomena in the dijet mass distribution using p p collision data at s = 8 TeV with the ATLAS detector journal, March 2015

The anatomy of electroweak symmetry breaking journal, February 2008

Survey of vector-like fermion extensions of the Standard Model and their phenomenological implications journal, September 2014

Bounds and decays of new heavy vector-like top partners journal, November 2010

Heavy vector-like top partners at the LHC and flavour constraints journal, March 2012

The global electroweak fit at NNLO and prospects for the LHC and ILC journal, September 2014

Limits on vectorlike leptons from searches for anomalous production of multi-lepton events journal, December 2014

Search for vectorlike charge 2 / 3 T quarks in proton-proton collisions at ( s ) = 8 TeV journal, January 2016

Search for an additional, heavy Higgs boson in the $$H\rightarrow ZZ$$ H → Z Z decay channel at $$\sqrt{s} = 8\;\text{ TeV }$$ s = 8 TeV in $$pp$$ p p collision data with the ATLAS detector journal, January 2016

Search for Higgs Boson Pair Production in the γ γ b b ¯ Final State Using p p Collision Data at s = 8 TeV from the ATLAS Detector journal, February 2015

Search for a CP-odd Higgs boson decaying to Zh in pp collisions at s = 8 TeV with the ATLAS detector journal, May 2015

Search for new resonances in Wγ and Zγ final states in pp collisions at s = 8 TeV with the ATLAS detector journal, November 2014

Higgs production and decay into heavy flavours with the gluon fusion mechanism journal, October 1984

Higgs decay to top quarks at hadron colliders journal, July 1994

On the top–antitop invariant mass spectrum at the LHC from a Higgs boson signal perspective journal, June 2012

Signatures of Higgs bosons in the top quark decay channel at hadron colliders journal, November 1998

Top-Quark Pairs at High Invariant Mass: A Model-Independent Discriminator of New Physics at the Large Hadron Collider journal, January 2008

The other Higgses, at resonance, in the Lee-Wick extension of the Standard Model journal, October 2011

Top pair invariant mass distribution: a window on new physics journal, January 2009

Fully covering the MSSM Higgs sector at the LHC journal, June 2015

Composite models for the 750 GeV diphoton excess journal, March 2016

The LHC diphoton resonance and dark matter journal, April 2016

Knocking on new physics’ door with a scalar resonance journal, March 2016

Identifying top partners at LHC journal, November 2009

Phenomenology of an S U ( 2 ) 1 × S U ( 2 ) 2 × U ( 1 ) Y model at the LHC journal, January 2017

Interpreting 750 GeV diphoton excess with R -parity violating supersymmetry journal, January 2017

Simplified Models for Higgs Physics: Singlet Scalar and Vector-like Quark Phenomenology text, January 2016

Scattering Light by Light at 750 GeV at the LHC text, January 2015

Loop Induced Single Top Partner Production and Decay at the LHC text, January 2018

Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
journal, September 2012

Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
journal, September 2012

Does the ‘Higgs’ have Spin Zero?
journal, September 2012

Distinguishing ‘Higgs’ spin hypotheses using γγ and WW ∗ decays
journal, July 2013

On the Use of Subtraction Fields and the Lifetimes of Some Types of Meson Decay
journal, October 1949

On Gauge Invariance and Vacuum Polarization
journal, June 1951

Axial-Vector Vertex in Spinor Electrodynamics
journal, January 1969

A PCAC puzzle: π0→γγ in the σ-model
journal, March 1969

Canonical anomalies and broken scale invariance
journal, July 1972

Nonperturbative Evaluation of the Anomalies in Low-Energy Theorems
journal, May 1972

A phenomenological profile of the Higgs boson
journal, January 1976

Search for Scalar Diphoton Resonances in the Mass Range 65–600 GeV with the ATLAS Detector in $p p$ Collision Data at $\sqrt{s} = 8 TeV$
journal, October 2014

Search for diphoton resonances in the mass range from 150 to 850 GeV in pp collisions at $\sqrt{s} = 8 TeV$
journal, November 2015

Review of Particle Physics
journal, August 2014

Supersymmetric standard model spectra from RCFT orientifolds
journal, March 2005

A mini-landscape of exact MSSM spectra in heterotic orbifolds
journal, February 2007

Light custodians in natural composite Higgs models
journal, March 2007

Discovering the composite Higgs through the decay of a heavy fermion
journal, July 2012

A first top partner hunter’s guide
journal, April 2013

Modified Higgs physics from composite light flavors
journal, September 2013

Vector-like bottom quarks in composite Higgs models
journal, March 2014

Phenomenology of the little Higgs model
journal, May 2003

Collider signatures for new $T$ -parity-odd quarks in little Higgs models
journal, May 2007

A fermionic top partner: naturalness and the LHC
journal, July 2012

LHC signatures of warped-space vectorlike quarks
journal, August 2014

Extra matters decree the relatively heavy Higgs of mass about 125 GeV in the supersymmetric model
journal, March 2012

Vector-like fields, messenger mixing and the Higgs mass in gauge mediation
journal, May 2014

Gauge mediation models with vectorlike matters at the LHC
journal, January 2013

Model-independent bounds on a light Higgs
journal, April 2012

Computing decay rates for new physics theories with FeynRules and MadGraph 5_aMC@NLO
journal, December 2015

The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
journal, July 2014

MCFM for the Tevatron and the LHC
journal, August 2010

NLO Higgs boson production plus one and two jets using the POWHEG BOX, MadGraph4 and MCFM
journal, July 2012

The matrix element method at next-to-leading order
journal, November 2012

Distinguishing the Higgs Boson from the Dilaton at the Large Hadron Collider
journal, March 2008

$CP$ Conservation in the Presence of Pseudoparticles
journal, June 1977

Light pseudoscalars, particle physics and cosmology
journal, June 1987

Beyond the minimal composite Higgs model
journal, April 2009

Composite Higgses with seesaw EWSB
journal, December 2015

Search for new phenomena in the dijet mass distribution using $p p$ collision data at $\sqrt{s} = 8 TeV$ with the ATLAS detector
journal, March 2015

The anatomy of electroweak symmetry breaking
journal, February 2008

Survey of vector-like fermion extensions of the Standard Model and their phenomenological implications
journal, September 2014

Bounds and decays of new heavy vector-like top partners
journal, November 2010

Heavy vector-like top partners at the LHC and flavour constraints
journal, March 2012

The global electroweak fit at NNLO and prospects for the LHC and ILC
journal, September 2014

Limits on vectorlike leptons from searches for anomalous production of multi-lepton events
journal, December 2014

Search for vectorlike charge $2 / 3 T$ quarks in proton-proton collisions at $\sqrt{(} s) = 8 TeV$
journal, January 2016

Search for an additional, heavy Higgs boson in the $$H\rightarrow ZZ$$ H → Z Z decay channel at $$\sqrt{s} = 8\;\text{ TeV }$$ s = 8 TeV in $$pp$$ p p collision data with the ATLAS detector
journal, January 2016

Search for Higgs Boson Pair Production in the $γ γ b \bar{b}$ Final State Using $p p$ Collision Data at $\sqrt{s} = 8 TeV$ from the ATLAS Detector
journal, February 2015

Search for a CP-odd Higgs boson decaying to Zh in pp collisions at $\sqrt{s} = 8 TeV$ with the ATLAS detector
journal, May 2015

Search for new resonances in Wγ and Zγ final states in pp collisions at $\sqrt{s} = 8 TeV$ with the ATLAS detector
journal, November 2014

Higgs production and decay into heavy flavours with the gluon fusion mechanism
journal, October 1984

Higgs decay to top quarks at hadron colliders
journal, July 1994

On the top–antitop invariant mass spectrum at the LHC from a Higgs boson signal perspective
journal, June 2012

Signatures of Higgs bosons in the top quark decay channel at hadron colliders
journal, November 1998

Top-Quark Pairs at High Invariant Mass: A Model-Independent Discriminator of New Physics at the Large Hadron Collider
journal, January 2008

The other Higgses, at resonance, in the Lee-Wick extension of the Standard Model
journal, October 2011

Top pair invariant mass distribution: a window on new physics
journal, January 2009

Fully covering the MSSM Higgs sector at the LHC
journal, June 2015

Composite models for the 750 GeV diphoton excess
journal, March 2016

The LHC diphoton resonance and dark matter
journal, April 2016

Knocking on new physics’ door with a scalar resonance
journal, March 2016

Identifying top partners at LHC
journal, November 2009

Phenomenology of an $S U (2)_{1} \times S U (2)_{2} \times U (1)_{Y}$ model at the LHC
journal, January 2017

Interpreting 750 GeV diphoton excess with R -parity violating supersymmetry
journal, January 2017

Simplified Models for Higgs Physics: Singlet Scalar and Vector-like Quark Phenomenology
text, January 2016

Scattering Light by Light at 750 GeV at the LHC
text, January 2015

Loop Induced Single Top Partner Production and Decay at the LHC
text, January 2018