Determining the spacetime structure of bottom-quark couplings to spin-zero particles

Ghosh, Tathagata; Godbole, Rohini; Tata, Xerxes

doi:10.1103/PhysRevD.100.015026

Title: Determining the spacetime structure of bottom-quark couplings to spin-zero particles

Abstract

We present a general argument that highlights the difficulty of determining the spacetime structure of the renormalizable bottom-quark Yukawa interactions of the Standard Model Higgs boson, or for that matter of any hypothetical spin-zero particle, at high energy colliders. The essence of the argument is that, it is always possible, by chiral rotations, to transform between scalar and pseudoscalar Yukawa interactions without affecting the interactions of bottom quarks with SM gauge bosons. Since these rotations affect only the $b$ -quark mass terms in the Standard Model Lagrangian, any differences in observables for scalar versus pseudoscalar couplings vanish when $m_{b} \to 0$ , and are strongly suppressed in high energy processes involving the heavy spin-zero particle where the $b$ quarks are typically relativistic. We show, however, that the energy dependence of, for instance, $e^{+} e^{-} \to b \bar{b} X$ (here $X$ denotes the spin-zero particle) close to the reaction threshold may serve to provide a distinction between the scalar versus pseudoscalar coupling at electron-positron colliders that are being proposed, provided that the $X b \bar{b}$ coupling is sizeable. We also note that while various kinematic distributions for $t \bar{t} h$ are indeed sensitive to the spacetime structure of the top-Yukawa coupling, for a spin-zero particle $X$ of an arbitrary mass, the said sensitivity is lost if $m_{X} ≫ m_{t}$ .

Authors:: Ghosh, Tathagata; Godbole, Rohini; Tata, Xerxes

Publication Date:: 2019-07-18

Research Org.:: Univ. of Hawaii, Honolulu, HI (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP)

OSTI Identifier:: 1543053

Alternate Identifier(s):: OSTI ID: 1598843

Grant/Contract Number:: SC0010504

Resource Type:: Published Article

Journal Name:: Physical Review D

Additional Journal Information:: Journal Name: Physical Review D Journal Volume: 100 Journal Issue: 1; Journal ID: ISSN 2470-0010

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats


                    Ghosh, Tathagata, Godbole, Rohini, and Tata, Xerxes. Determining the spacetime structure of bottom-quark couplings to spin-zero particles.  United States: N. p., 2019. 
Web.  https://doi.org/10.1103/PhysRevD.100.015026.

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                    Ghosh, Tathagata, Godbole, Rohini, & Tata, Xerxes. Determining the spacetime structure of bottom-quark couplings to spin-zero particles.  United States.  https://doi.org/10.1103/PhysRevD.100.015026

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                    Ghosh, Tathagata, Godbole, Rohini, and Tata, Xerxes. Thu .  
"Determining the spacetime structure of bottom-quark couplings to spin-zero particles".  United States.  https://doi.org/10.1103/PhysRevD.100.015026.

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@article{osti_1543053,

  title        = {Determining the spacetime structure of bottom-quark couplings to spin-zero particles},

  author       = {Ghosh, Tathagata and Godbole, Rohini and Tata, Xerxes},

  abstractNote = {We present a general argument that highlights the difficulty of determining the spacetime structure of the renormalizable bottom-quark Yukawa interactions of the Standard Model Higgs boson, or for that matter of any hypothetical spin-zero particle, at high energy colliders. The essence of the argument is that, it is always possible, by chiral rotations, to transform between scalar and pseudoscalar Yukawa interactions without affecting the interactions of bottom quarks with SM gauge bosons. Since these rotations affect only the b-quark mass terms in the Standard Model Lagrangian, any differences in observables for scalar versus pseudoscalar couplings vanish when mb→0, and are strongly suppressed in high energy processes involving the heavy spin-zero particle where the b quarks are typically relativistic. We show, however, that the energy dependence of, for instance, e+e-→bb¯X (here X denotes the spin-zero particle) close to the reaction threshold may serve to provide a distinction between the scalar versus pseudoscalar coupling at electron-positron colliders that are being proposed, provided that the Xbb¯ coupling is sizeable. We also note that while various kinematic distributions for tt¯h are indeed sensitive to the spacetime structure of the top-Yukawa coupling, for a spin-zero particle X of an arbitrary mass, the said sensitivity is lost if mX≫mt.},

  doi          = {10.1103/PhysRevD.100.015026},

  journal      = {Physical Review D},

  number       = 1,

  volume       = 100,

  place        = {United States},

  year         = {2019},

  month        = {7}

}

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Title: Determining the spacetime structure of bottom-quark couplings to spin-zero particles

Abstract

Citation Formats

Boosting the Direct C P Measurement of the Higgs-Top Coupling journal, March 2016

Laboratory-frame observables for probing the top-Higgs boson interaction journal, July 2015

Determining the C P Properties of the Higgs Boson journal, February 2008

The anatomy of electroweak symmetry breaking journal, February 2008

Scalar simplified models for dark matter journal, January 2015

Scalar and pseudoscalar Higgs production in association with a top–antitop pair journal, July 2011

Observation of Higgs Boson Decay to Bottom Quarks journal, September 2018

Observation of the Higgs boson decay to a pair of τ leptons with the CMS detector journal, April 2018

Prospects of constraining the Higgs boson’s C P nature in the tau decay channel at the LHC journal, November 2015

Determining the t t ¯ and ZZ Couplings of a Neutral Higgs Boson of Arbitrary CP Nature at the Next Linear Collider journal, December 1996

Determining the CP Nature of a Neutral Higgs Boson at the CERN Large Hadron Collider journal, June 1996

Test of CP invariance in vector-boson fusion production of the Higgs boson using the Optimal Observable method in the ditau decay channel with the ATLAS detector journal, November 2016

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

Two Photon Background and the Reach of a Linear Collider for Supersymmetry in WMAP Favoured Coannihilation Regions journal, June 2004

Measuring the CP property of Higgs coupling to tau leptons in the VBF channel at the LHC journal, May 2017

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

Model-independent analysis of Higgs spin and CP properties in the process $\boldsymbol{e}^{+} \boldsymbol{e}^{-} \to\boldsymbol{t}\bar{\boldsymbol{t}} \boldsymbol{\Phi}$ journal, June 2011

CP determination for new spin zero mesons by the decay mode journal, June 1989

Search for the Higgs Boson Decaying to Two Muons in Proton-Proton Collisions at s = 13 TeV journal, January 2019

Prospect for measuring the C P phase in the h τ τ coupling at the LHC journal, April 2015

Enhancing the t t ¯ H $$ t\overline{t} H $$ signal through top-quark spin polarization effects at the LHC journal, July 2014

Probing the top-Higgs Yukawa CP structure in dileptonic t t ¯ h $$ t\overline{t}h $$ with M2-assisted reconstruction journal, June 2018

Probing the C P nature of the Higgs coupling in t t ¯ h events at the LHC journal, July 2017

Probing CP violation in e + e − production of the Higgs boson and toponia journal, June 2016

Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector journal, April 2015

Heavy baryons as polarimeters at colliders journal, November 2015

Constraints on the spin-parity and anomalous H V V couplings of the Higgs boson in proton collisions at 7 and 8 TeV journal, July 2015

Probing the CP nature of the Higgs boson at linear colliders with τ spin correlations; the case of mixed scalar–pseudoscalar couplings journal, January 2004

Measurement of the Higgs boson coupling properties in the H → ZZ∗ → 4ℓ decay channel at s = 13 $$ \sqrt{s}=13 $$ TeV with the ATLAS detector journal, March 2018

Disentangling Higgs-top couplings in associated production journal, April 2014

Higgs radiation off top quarks in high-energye + e − colliders journal, June 1992

Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction journal, September 2014

Observation of H → b b ¯ decays and VH production with the ATLAS detector journal, November 2018

Search for neutral MSSM Higgs bosons decaying into a pair of bottom quarks journal, November 2015

Production, decay, and polarization of excited heavy hadrons journal, April 1994

Erratum to: Study of the spin and parity of the Higgs boson in diboson decays with the ATLAS detector journal, March 2016

Angular distributions in t t ¯ H ( H → b b ¯ ) reconstructed events at the LHC journal, August 2015

Probing the indefinite C P nature of the Higgs boson through decay distributions in the process e + e − → t t ¯ Φ journal, June 2013

Constraining the strength and C P structure of dark production at the LHC: The associated top-pair channel journal, February 2016

Combined search for anomalous pseudoscalar HVV couplings in VH ( H → b b ‾ ) production and H → VV decay journal, August 2016

Measurements of the Higgs boson width and anomalous H V V couplings from on-shell and off-shell production in the four-lepton final state journal, June 2019

Determining the C P Parity of Higgs Bosons via Their τ Decay Channels at the Large Hadron Collider journal, April 2008

Observation of t t ¯ H Production journal, June 2018

Constraining anomalous Higgs boson couplings to the heavy-flavor fermions using matrix element techniques journal, September 2016

Constraints on anomalous Higgs boson couplings using production and decay information in the four-lepton final state journal, December 2017

Close-to-threshold meson production in hadronic interactions journal, January 2002

Study of the spin and parity of the Higgs boson in diboson decays with the ATLAS detector journal, October 2015

Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector journal, September 2018

Search for beyond the standard model Higgs bosons decaying into a b b ¯ $$ \mathrm{b}\overline{\mathrm{b}} $$ pair in pp collisions at s = 13 $$ \sqrt{s}=13 $$ TeV journal, August 2018

Boosting the Direct $C P$ Measurement of the Higgs-Top Coupling
journal, March 2016

Laboratory-frame observables for probing the top-Higgs boson interaction
journal, July 2015

Determining the $C P$ Properties of the Higgs Boson
journal, February 2008

The anatomy of electroweak symmetry breaking
journal, February 2008

Scalar simplified models for dark matter
journal, January 2015

Scalar and pseudoscalar Higgs production in association with a top–antitop pair
journal, July 2011

Observation of Higgs Boson Decay to Bottom Quarks
journal, September 2018

Observation of the Higgs boson decay to a pair of τ leptons with the CMS detector
journal, April 2018

Prospects of constraining the Higgs boson’s $C P$ nature in the tau decay channel at the LHC
journal, November 2015

Determining the $t \bar{t}$ and $ZZ$ Couplings of a Neutral Higgs Boson of Arbitrary $CP$ Nature at the Next Linear Collider
journal, December 1996

Determining the CP Nature of a Neutral Higgs Boson at the CERN Large Hadron Collider
journal, June 1996

Test of CP invariance in vector-boson fusion production of the Higgs boson using the Optimal Observable method in the ditau decay channel with the ATLAS detector
journal, November 2016

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

Two Photon Background and the Reach of a Linear Collider for Supersymmetry in WMAP Favoured Coannihilation Regions
journal, June 2004

Measuring the CP property of Higgs coupling to tau leptons in the VBF channel at the LHC
journal, May 2017

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

Model-independent analysis of Higgs spin and CP properties in the process $\boldsymbol{e}^{+} \boldsymbol{e}^{-} \to\boldsymbol{t}\bar{\boldsymbol{t}} \boldsymbol{\Phi}$
journal, June 2011

CP determination for new spin zero mesons by the decay mode
journal, June 1989

Search for the Higgs Boson Decaying to Two Muons in Proton-Proton Collisions at $\sqrt{s} = 13 TeV$
journal, January 2019

Prospect for measuring the $C P$ phase in the $h τ τ$ coupling at the LHC
journal, April 2015

Enhancing the t t ¯ H $$ t\overline{t} H $$ signal through top-quark spin polarization effects at the LHC
journal, July 2014

Probing the top-Higgs Yukawa CP structure in dileptonic t t ¯ h $$ t\overline{t}h $$ with M2-assisted reconstruction
journal, June 2018

Probing the $C P$ nature of the Higgs coupling in $t \bar{t} h$ events at the LHC
journal, July 2017

Probing CP violation in e + e − production of the Higgs boson and toponia
journal, June 2016

Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector
journal, April 2015

Heavy baryons as polarimeters at colliders
journal, November 2015

Constraints on the spin-parity and anomalous $H V V$ couplings of the Higgs boson in proton collisions at 7 and 8 TeV
journal, July 2015

Probing the CP nature of the Higgs boson at linear colliders with τ spin correlations; the case of mixed scalar–pseudoscalar couplings
journal, January 2004

Measurement of the Higgs boson coupling properties in the H → ZZ∗ → 4ℓ decay channel at s = 13 $$ \sqrt{s}=13 $$ TeV with the ATLAS detector
journal, March 2018

Disentangling Higgs-top couplings in associated production
journal, April 2014

Higgs radiation off top quarks in high-energye + e − colliders
journal, June 1992

Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction
journal, September 2014

Observation of $H \to b \bar{b}$ decays and VH production with the ATLAS detector
journal, November 2018

Search for neutral MSSM Higgs bosons decaying into a pair of bottom quarks
journal, November 2015

Production, decay, and polarization of excited heavy hadrons
journal, April 1994

Erratum to: Study of the spin and parity of the Higgs boson in diboson decays with the ATLAS detector
journal, March 2016

Angular distributions in $t \bar{t} H (H \to b \bar{b})$ reconstructed events at the LHC
journal, August 2015

Probing the indefinite $C P$ nature of the Higgs boson through decay distributions in the process $e^{+} e^{-} \to t \bar{t} Φ$
journal, June 2013

Constraining the strength and $C P$ structure of dark production at the LHC: The associated top-pair channel
journal, February 2016

Combined search for anomalous pseudoscalar HVV couplings in $VH (H \to b \overline{b})$ production and H → VV decay
journal, August 2016

Measurements of the Higgs boson width and anomalous $H V V$ couplings from on-shell and off-shell production in the four-lepton final state
journal, June 2019

Determining the $C P$ Parity of Higgs Bosons via Their $τ$ Decay Channels at the Large Hadron Collider
journal, April 2008

Observation of $t \bar{t} H$ Production
journal, June 2018

Constraining anomalous Higgs boson couplings to the heavy-flavor fermions using matrix element techniques
journal, September 2016

Constraints on anomalous Higgs boson couplings using production and decay information in the four-lepton final state
journal, December 2017

Close-to-threshold meson production in hadronic interactions
journal, January 2002

Study of the spin and parity of the Higgs boson in diboson decays with the ATLAS detector
journal, October 2015

Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector
journal, September 2018

Search for beyond the standard model Higgs bosons decaying into a b b ¯ $$ \mathrm{b}\overline{\mathrm{b}} $$ pair in pp collisions at s = 13 $$ \sqrt{s}=13 $$ TeV
journal, August 2018