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Directly Measuring the Tensor Structure of the Scalar Coupling to Gauge Bosons
High Energy Physics - Phenomenology · Submitted 23 Aug 2012
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We show that using full kinematic information from each event allows discrimination between renormalizable and higher dimensional coupling to ZZ at the 95% confidence level with O(50) signal events, and coupling to Z\gamma can be distinguished with as few as 20 signal events.
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The abstract, sentence by sentence
Kinematic distributions in the decays of the newly discovered resonance to four leptons can provide a direct measurement of the tensor structure of the particle's couplings to gauge bosons. Even if the particle is shown to be a parity even scalar, measuring this tensor structure is a necessary step in determining if this particle is responsible for giving mass to the Z. We consider a Standard Model like coupling as well as coupling via a dimension five operator to either ZZ or Z\gamma. We show that using full kinematic information from each event allows discrimination between renormalizable and higher dimensional coupling to ZZ at the 95% confidence level with O(50) signal events, and coupling to Z\gamma can be distinguished with as few as 20 signal events. This shows that these measurements can be useful even with this year's LHC data.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Kinematic distributions in the decays of the newly discovered resonance to four leptons can provide a direct measurement of the tensor structure of the particle's couplings to gauge bosons. | background 0.72 | 0.13 | 0.18 | hedged possibility 0.63 |
| s1 | Even if the particle is shown to be a parity even scalar, measuring this tensor structure is a necessary step in determining if this particle is responsible for giving mass to the Z. | background 0.63 | 0.06 | 0.07 | asserted 0.98 |
| s2 | We consider a Standard Model like coupling as well as coupling via a dimension five operator to either ZZ or Z\gamma. | method 0.66 | 0.45 | 0.03 | asserted 0.59 |
| s3 | We show that using full kinematic information from each event allows discrimination between renormalizable and higher dimensional coupling to ZZ at the 95% confidence level with O(50) signal events, and coupling to Z\gamma can be distinguished with as few as 20 signal events. | result 1.00 | 0.92 | 0.79 | asserted 1.00 |
| s4 | This shows that these measurements can be useful even with this year's LHC data. | interpretation 1.00 | 0.39 | 0.18 | asserted 0.59 |
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The paper
Original abstract
Kinematic distributions in the decays of the newly discovered resonance to four leptons can provide a direct measurement of the tensor structure of the particle's couplings to gauge bosons. Even if the particle is shown to be a parity even scalar, measuring this tensor structure is a necessary step in determining if this particle is responsible for giving mass to the Z. We consider a Standard Model like coupling as well as coupling via a dimension five operator to either ZZ or Z\gamma. We show that using full kinematic information from each event allows discrimination between renormalizable and higher dimensional coupling to ZZ at the 95% confidence level with O(50) signal events, and coupling to Z\gamma can be distinguished with as few as 20 signal events. This shows that these measurements can be useful even with this year's LHC data.
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References
How the literature uses it
42 arXiv papers cite this in 52 sentences
Papers citing it · 25 sentences without a confident label
Uses its method or tool 4 papers
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To distinguish the SM $h →ZZ^* →4 ℓ$ decays from those involving a new hidden photon or heavy fermion, we employ a simplified likelihood analysis following closely the procedure used in Ref. [ref] and described in more detail in [ref] .
Exotic Higgs decays in the golden channel · Methods · 1.00
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The authors of the literatures [ref] have provided a useful method to discriminate between pure scalar and pure pseudoscalar state for the new particle.
CP mixed property of the Higgs-like particle in the decay channel $h\to Z Z^*\to 4l$ · Introduction · 0.93
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In order to compute this, we follow the hypothesis testing procedure described in, for example, [ref] .
Breakdown of Effective Field Theory for a Gluon Initiated Resonance · Effective Field Theory Description · 1.00
Cites it as support 1 paper
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This is confirmed with the exact angular and invariant mass distributions among leptons induced by pure vectorial and pure tensorial couplings [ref] .
A Bayesian view of the Higgs sector with higher dimensional operators · $h→VV^*$ · 0.97
Cites it as background 18 papers
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Some authors [ref] have studied the decay channel $h→ZZ^*→l_1^+l_1^- l_2^+l^-_2$ with $l_1$, $l_2=e$ or $μ$
CP mixed property of the Higgs-like particle in the decay channel $h\to Z Z^*\to 4l$ · Introduction · 0.84
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the $gg→H→ZZ →4ℓ$ process, which is called the golden channel, is the most precise and has been studied extensively in both theoretical studies [ref] and experiments at LHC [ref] .
Anomalous $H\to ZZ \to 4\ell$ decay and its interference effects at the LHC · Introduction · 0.83
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In Refs. [ref] NP effects in $H →4ℓ$ decays are parametrized in terms of specific anomalous Higgs vertices, while in Refs. [ref] the language of pseudo-observables (PO) is adopted.
Higgs decay into four charged leptons in the presence of dimension-six operators · Introduction · 0.93
What it cites · 16 sentences without a confident label
Builds on 1 paper
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Furthermore, the analysis of [ref] only considers a mass of a scalar greater than twice the $Z$ mass, while we here will be working in the kinematic regime where one of the $Z$'s is far off-shell.
The Higgs Mechanism and Loop-induced Decays of a Scalar into Two Z Bosons · Introduction · 0.99
Uses the method or tool of 3 papers
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We use a standard unbinned likelihood analysis which is described in detail in [ref] .
Spin determination of single-produced resonances at hadron colliders · Distinguishing Operators · 1.00
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We use the Johns Hopkins MC described in [ref] to simulate $a_h$ and $a_s$, and Madgraph 5 [ref] for $a_Zγ$.
MadGraph 5 : Going Beyond · Four Lepton Events · 1.00
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Furthermore, reweighting techniques such as the one laid out in [ref] can be used to further purify the event selection.
sPlot: a statistical tool to unfold data distributions · Distinguishing Operators · 0.99
Uses data or values from 1 paper
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While there is as yet no direct limit in this channel, [ref] uses the measurement of the $Zγ$ cross section to place a limit on the ratio of the $Zγ$ mode to the four lepton mode to be about 40.
Have We Observed the Higgs (Imposter)? · Four Lepton Events · 0.95
Cites as background 32 papers
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These expressions, at least of the Higgs, can be found in many places in the literature including [ref] and references therein.
Improving the sensitivity of Higgs boson searches in the golden channel · Four Lepton Events · 0.90
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The discovery of a new particle by the CMS [ref] and ATLAS [ref] experiments is a great triumph for particle physics, but it also leads to a host of new questions about the nature of the new state.
Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC · Introduction · 0.97
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The discovery of a new particle by the CMS [ref] and ATLAS [ref] experiments is a great triumph for particle physics, but it also leads to a host of new questions about the nature of the new state.
Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC · Introduction · 0.97
Discussion
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