Probing CP Violation with and without Momentum Reconstruction at the LHC

G.Moortgat-Pick; J.Tattersall; K.Rolbiecki; P.Wienemann

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Probing CP Violation with and without Momentum Reconstruction at the LHC

G.Moortgat-Pick, K.Rolbiecki, J.Tattersall, P.Wienemann

High Energy Physics - Phenomenology · Submitted 18 Aug 2009

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

The authors' main claim We show that with 300 fb$^{-1}$ of collected data, CP violation may be discovered at the LHC for a wide range of the phase of the bino mass parameter $M_1$.

how it is stated · hedged possibility 0.94 read the record →

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arXiv ID0908.2631 (version 2)

Pith IDJAI4DV55, Pith's permanent record of this paper and its review

CitationG.Moortgat-Pick, J.Tattersall, K.Rolbiecki, P.Wienemann. "Probing CP Violation with and without Momentum Reconstruction at the LHC." arXiv:0908.2631 (2009). https://pith.science/paper/JAI4DV55

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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.

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Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 5,568 input tokens, $0.0002 reported.

What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.74 · human participants 0.01 · controlled comparison 0.07 · randomized assignment 0.01 · states quantitative result 0.88 · compares with prior results 0.19 · mentions code or data availability 0.02.

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arXiv listing abstract v2. Results and the main claim are underlined; show every role.

We study the potential to observe CP-violating effects in SUSY cascade decay chains at the LHC. We consider squark and gluino production followed by subsequent decays into neutralinos with a three-body leptonic decay in the final step. Asymmetries composed by triple products of momenta of the final state particles are sensitive to CP-violating effects. Due to large boosts these asymmetries can be difficult to observe at a hadron collider. We show that using all available kinematic information one can reconstruct the decay chains on an event-by-event basis even in the case of 3-body decays, neutrinos and LSPs in the final state. We also discuss the most important experimental effects like major backgrounds and momentum smearing due to finite detector resolution. We show that with 300 fb$^{-1}$ of collected data, CP violation may be discovered at the LHC for a wide range of the phase of the bino mass parameter $M_1$.

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 study the potential to observe CP-violating effects in SUSY cascade decay chains at the LHC.	contribution 0.98	0.87	0.05	hedged possibility 0.48
s1	We consider squark and gluino production followed by subsequent decays into neutralinos with a three-body leptonic decay in the final step.	contribution 0.43	0.45	0.02	asserted 0.85
s2	Asymmetries composed by triple products of momenta of the final state particles are sensitive to CP-violating effects.	background 0.74	0.17	0.05	asserted 0.99
s3	Due to large boosts these asymmetries can be difficult to observe at a hadron collider.	background 0.77	0.12	0.02	asserted 0.57
s4	We show that using all available kinematic information one can reconstruct the decay chains on an event-by-event basis even in the case of 3-body decays, neutrinos and LSPs in the final state.	method 0.73	0.92	0.16	asserted 1.00
s5	We also discuss the most important experimental effects like major backgrounds and momentum smearing due to finite detector resolution.	contribution 0.60	0.59	0.02	asserted 0.72
s6	We show that with 300 fb$^{-1}$ of collected data, CP violation may be discovered at the LHC for a wide range of the phase of the bino mass parameter $M_1$.	result 0.98	0.87	0.82	hedged possibility 0.94

What kind of paper the classifier reports this is: simulation study 0.59 · evidence from simulation or computation 0.95.

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arXiv listing abstract v2

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

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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 study the potential to observe CP-violating effects in SUSY cascade decay chains at the LHC. We consider squark and gluino production followed by subsequent decays into neutralinos with a three-body leptonic decay in the final step. Asymmetries composed by triple products of momenta of the final state particles are sensitive to CP-violating effects. Due to large boosts these asymmetries can be difficult to observe at a hadron collider. We show that using all available kinematic information one can reconstruct the decay chains on an event-by-event basis even in the case of 3-body decays, neutrinos and LSPs in the final state. We also discuss the most important experimental effects like major backgrounds and momentum smearing due to finite detector resolution. We show that with 300 fb$^{-1}$ of collected data, CP violation may be discovered at the LHC for a wide range of the phase of the bino mass parameter $M_1$.

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How the literature uses it

14 arXiv papers cite this in 37 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 · 26 sentences without a confident label

Builds on it 1 paper

For the present paper, we extend the ideas described in detail in Ref. [ref] of momentum reconstruction to $$ production and two-body decays.

Momentum reconstruction at the LHC for probing CP-violation in the stop sector · Introduction · 1.00

Uses its method or tool 3 papers

We have 8 unknowns (the components of the four-momenta of the invisible final state particles) and can therefore solve the system [ref] .

CP Violation in SUSY Cascade Decay Chains at the LHC · CP asymmetry with momentum reconstruction · 0.87
In order to overcome the dilution factor due to PDFs, we investigate the possibility of reconstructing the momenta of the invisible particles ($χ̃^0_1$) in the process on an event by event basis [ref] .

CP-violation in SUSY cascades at the LHC · CP-violation with momentum reconstruction · 0.83
We impose basic selection cuts and momentum smearing due to the finite detector resolution, see Ref. [ref] for details.

Probing CP Violation with Kinematic Reconstruction at the LHC · CP asymmetry with momentum reconstruction · 0.90

Cites it as background 6 papers

The determination of the latter has recently attracted increased attention [ref] .

Momentum asymmetries as CP violating observables · Introduction · 0.93
At the LHC, CP-odd triple product asymmetries have been studied in the decays of third generation squarks [ref] , and three-body decays of neutralinos which originate from squarks [ref] .

Normal tau polarisation as a sensitive probe of CP violation in chargino decay · Introduction · 0.99
Concerning collider phenomenology, it can affect neutralino production rates and CP-violating observables at the LHC, see e.g.Ref. [ref] , and at a future LC, see e.g. Refs. [ref] .

Consistent on shell renormalisation of electroweakinos in the complex MSSM: LHC and LC predictions · The MSSM with complex parameters and its renormalisation in the on-shell scheme · 0.85

What it cites · 17 sentences without a confident label

Uses the method or tool of 3 papers

For our procedure we follow the methods for solving the kinematic equations very closely to those presented in [ref] .

Mass Determination in SUSY-like Events with Missing Energy · Reconstruction procedure · 1.00
Finally, in order to assess the feasibility of completing this study in the demanding experimental environment of the LHC we perform a simulation of our process using the Monte Carlo event generator [ref] .

Herwig++ Physics and Manual · Introduction · 1.00
Finally, in order to assess the feasibility of completing this study in the demanding experimental environment of the LHC we perform a simulation of our process using the Monte Carlo event generator [ref] .

Herwig++ 2.2 Release Note · Introduction · 1.00

Cites as background 8 papers

The triple product that is constructed from momenta in the laboratory frame suffers from dilution factors at the LHC due to the frame being boosted with respect to the rest frame of the $χ̃^0_2$, for a more detailed discussion see [ref] .

Measurement of CP Violation in Stop Cascade Decays at the LHC · Dilution effects · 0.80
So far in the literature the momentum reconstruction was used to determine the unknown masses of SUSY particles in the case when the decay chain proceeded via two-body decays [ref] .

A hybrid method for determining particle masses at the Large Hadron Collider with fully identified cascade decays · Introduction · 0.84
So far in the literature the momentum reconstruction was used to determine the unknown masses of SUSY particles in the case when the decay chain proceeded via two-body decays [ref] .

Accurate Mass Determinations in Decay Chains with Missing Energy: II · Introduction · 0.84

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