Finding the Strong CP problem at the LHC

Anson Hook; Raffaele Tito D'Agnolo

RECORD

Finding the Strong CP problem at the LHC

Raffaele Tito D'Agnolo, Anson Hook

High Energy Physics - Phenomenology · Submitted 1 Jul 2015

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim We show that a class of parity based solutions to the strong CP problem predicts new colored particles with mass at the TeV scale, due to constraints from Planck suppressed operators.

how it is stated · asserted 1.00 read the record →

Comment (0) Read on arXiv ↗

Cite ▾

Claim paper

The compiled record

The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

Open the compiled record

Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 4,818 input tokens, $0.0002 reported.

What the abstract itself states, as probabilities: claims first 0.04 · states limitation 0.16 · human participants 0.01 · controlled comparison 0.02 · randomized assignment 0.01 · states quantitative result 0.30 · compares with prior results 0.23 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v1. Results and the main claim are underlined; show every role.

We show that a class of parity based solutions to the strong CP problem predicts new colored particles with mass at the TeV scale, due to constraints from Planck suppressed operators. The new particles are copies of the Standard Model quarks and leptons. The new quarks can be produced at the LHC and are either collider stable or decay into Standard Model quarks through a Higgs, a W or a Z boson. We discuss some simple but generic predictions of the models for the LHC and find signatures not related to the traditional solutions of the hierarchy problem. We thus provide alternative motivation for new physics searches at the weak scale. We also briefly discuss the cosmological history of these models and how to obtain successful baryogenesis.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	We show that a class of parity based solutions to the strong CP problem predicts new colored particles with mass at the TeV scale, due to constraints from Planck suppressed operators.	result 0.74	0.90	0.75	asserted 1.00
s1	The new particles are copies of the Standard Model quarks and leptons.	result 0.74	0.47	0.07	asserted 1.00
s2	The new quarks can be produced at the LHC and are either collider stable or decay into Standard Model quarks through a Higgs, a W or a Z boson.	result 0.81	0.57	0.16	asserted 0.83
s3	We discuss some simple but generic predictions of the models for the LHC and find signatures not related to the traditional solutions of the hierarchy problem.	contribution 0.71	0.95	0.20	asserted 1.00
s4	We thus provide alternative motivation for new physics searches at the weak scale.	interpretation 0.99	0.77	0.34	asserted 0.99
s5	We also briefly discuss the cosmological history of these models and how to obtain successful baryogenesis.	contribution 0.98	0.75	0.04	asserted 0.62

What kind of paper the classifier reports this is: theoretical result 1.00 · evidence from argument 0.69.

What was examined, and what was not

sources read

arXiv listing abstract v1

not examined

full text
figures and tables
references and citing sentences
relations to other papers

levels run

P abstract

not run

S sections
T body sentences
C citations
R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper

Original abstract

We show that a class of parity based solutions to the strong CP problem predicts new colored particles with mass at the TeV scale, due to constraints from Planck suppressed operators. The new particles are copies of the Standard Model quarks and leptons. The new quarks can be produced at the LHC and are either collider stable or decay into Standard Model quarks through a Higgs, a W or a Z boson. We discuss some simple but generic predictions of the models for the LHC and find signatures not related to the traditional solutions of the hierarchy problem. We thus provide alternative motivation for new physics searches at the weak scale. We also briefly discuss the cosmological history of these models and how to obtain successful baryogenesis.

Human review

How Pith checks papers → · Full audit of this paper →

References

Forward citations

Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

Universal Seesaw Leptogenesis
hep-ph 2025-12 conditional novelty 7.0 of 10

Leptogenesis can proceed from single-generation gauge-singlet mediator decays in a Universal Seesaw model if parity is broken in the neutrino sector; the lightest right-handed neutrino is a sub-eV dark-radiation relic.
Factoring the Strong CP Problem
hep-ph 2017-10 conditional novelty 7.0 of 10

Splitting SU(3) color into N product factors at a high scale lets N axions jointly relax the QCD theta angle to zero, producing axions much heavier than the standard QCD axion.
Naturalness: A Snowmass White Paper
hep-ph 2022-05 accept novelty 3.0 of 10

A survey arguing that naturalness remains a productive discovery strategy despite the LHC's null results, cataloguing old and new proposed solutions to the strong CP, cosmological constant, and electroweak hierarchy problems.
Search for vector-like quarks in events with two oppositely charged leptons and jets in proton-proton collisions at $\sqrt{s} =$ 13 TeV
hep-ex 2018-12 accept novelty 3.0 of 10

No excess of vector-like T or B quarks appears in 35.9 fb^-1 of 13 TeV CMS data with a dilepton Z plus jets signature, excluding T masses below 1280 GeV and B masses below 1130 GeV at 95% confidence for pure tZ and bZ decays.
TASI Lectures on the Strong CP Problem and Axions
hep-ph 2018-12 accept novelty 2.0 of 10

The lectures give a pedagogical, end-to-end account of the Strong CP problem, the axion solution, axion dark matter, and the experiments that search for it, without presenting new results.

How the literature uses it

17 arXiv papers cite this in 22 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 14 sentences without a confident label

Cites it as background 8 papers

The phenomenology of parity solutions to strong CP in this regime was discussed recently in [ref] .

P not PQ · Fermion masses and a low parity-breaking scale · 0.91
The simplest implementation expands the SM gauge group to $SU(3)×SU(2)_L×SU(2)_R×U(1)_Y$, and parity exchanges $SU(2)_L↔SU(2)_R$ [ref] (see also the recent study [ref] ).

Diphotons, New Vacuum Angles, and Strong CP · Solutions to Strong CP: UV vs. IR · 0.85
Thus our starting point is a $ℤ_2$ or parity symmetric theory, where the symmetry operation exchanges SM fields for their “mirror” partners.[Similar $_2$-symmetric constructions have been used, for example, to explain dark matter and the baryon asymmetry of the universe, naturalness of the weak scale and to solve the strong CP problem – see Refs. [ref] and references therein.] The discrete symmetry guarantees that the renormalization group running of couplings in the mirror sector is identical to the SM at high scales.

Solving the Wrong Hierarchy Problem · Introduction · 0.85

Discussion

Know something about this paper? Leave a comment, or highlight any passage above to comment on it.