# Consistent searches for SMEFT effects in non-resonant dijet events

## Abstract

Here, we investigate the bounds which can be placed on generic new-physics contributions to dijet production at the LHC using the framework of the Standard Model Effective Field Theory, deriving the first consistently-treated EFT bounds from non-resonant high-energy data. We recast an analysis searching for quark compositeness, equivalent to treating the SM with one higher-dimensional operator as a complete UV model. In order to reach consistent, model-independent EFT conclusions, it is necessary to truncate the EFT effects consistently at order $$1/\Lambda^2$$ and to include the possibility of multiple operators simultaneously contributing to the observables, neither of which has been done in previous searches of this nature. Furthermore, it is important to give consistent error estimates for the theoretical predictions of the signal model, particularly in the region of phase space where the probed energy is approaching the cutoff scale of the EFT. There are two linear combinations of operators which contribute to dijet production in the SMEFT with distinct angular behavior; we identify those linear combinations and determine the ability of LHC searches to constrain them simultaneously. Consistently treating the EFT generically leads to weakened bounds on new-physics parameters. These constraints will be a useful input to future global analyses in the SMEFT framework, and the techniques used here to consistently search for EFT effects are directly applicable to other off-resonance signals.

- Authors:

- Johannes Gutenberg-Univ. Mainz, Mainz (Germany)
- Johannes Gutenberg-Univ. Mainz, Mainz (Germany); Univ. Zurich, Zurich (Switzerland)

- Publication Date:

- Research Org.:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

- OSTI Identifier:
- 1418145

- Report Number(s):
- FERMILAB-PUB-17-507-T; MITP-17-082; ZU-TH-34-17; arXiv:1711.07484

Journal ID: ISSN 1029-8479; 1637363; TRN: US1801243

- Grant/Contract Number:
- AC02-07CH11359

- Resource Type:
- Journal Article: Accepted Manuscript

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

- Additional Journal Information:
- Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2018; Journal Issue: 1; Journal ID: ISSN 1029-8479

- Publisher:
- Springer Berlin

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Effective Field Theories; Beyond Standard Model; Perturbative QCD; Technicolor and Composite Models

### Citation Formats

```
Alte, Stefan, Konig, Matthias, and Shepherd, William.
```*Consistent searches for SMEFT effects in non-resonant dijet events*. United States: N. p., 2018.
Web. doi:10.1007/JHEP01(2018)094.

```
Alte, Stefan, Konig, Matthias, & Shepherd, William.
```*Consistent searches for SMEFT effects in non-resonant dijet events*. United States. doi:10.1007/JHEP01(2018)094.

```
Alte, Stefan, Konig, Matthias, and Shepherd, William. Fri .
"Consistent searches for SMEFT effects in non-resonant dijet events". United States.
doi:10.1007/JHEP01(2018)094. https://www.osti.gov/servlets/purl/1418145.
```

```
@article{osti_1418145,
```

title = {Consistent searches for SMEFT effects in non-resonant dijet events},

author = {Alte, Stefan and Konig, Matthias and Shepherd, William},

abstractNote = {Here, we investigate the bounds which can be placed on generic new-physics contributions to dijet production at the LHC using the framework of the Standard Model Effective Field Theory, deriving the first consistently-treated EFT bounds from non-resonant high-energy data. We recast an analysis searching for quark compositeness, equivalent to treating the SM with one higher-dimensional operator as a complete UV model. In order to reach consistent, model-independent EFT conclusions, it is necessary to truncate the EFT effects consistently at order $1/\Lambda^2$ and to include the possibility of multiple operators simultaneously contributing to the observables, neither of which has been done in previous searches of this nature. Furthermore, it is important to give consistent error estimates for the theoretical predictions of the signal model, particularly in the region of phase space where the probed energy is approaching the cutoff scale of the EFT. There are two linear combinations of operators which contribute to dijet production in the SMEFT with distinct angular behavior; we identify those linear combinations and determine the ability of LHC searches to constrain them simultaneously. Consistently treating the EFT generically leads to weakened bounds on new-physics parameters. These constraints will be a useful input to future global analyses in the SMEFT framework, and the techniques used here to consistently search for EFT effects are directly applicable to other off-resonance signals.},

doi = {10.1007/JHEP01(2018)094},

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

number = 1,

volume = 2018,

place = {United States},

year = {Fri Jan 19 00:00:00 EST 2018},

month = {Fri Jan 19 00:00:00 EST 2018}

}

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