SciPost Submission Page
Status of leptoquark models after LHC Run-2 and discovery prospects at future colliders
by Dr. Nishita Desai, Amartya Sengupta
Submission summary
| Authors (as registered SciPost users): | Amartya Sengupta |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202406_00034v1 (pdf) |
| Date submitted: | 2024-06-15 14:54 |
| Submitted by: | Sengupta, Amartya |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
|
| Approaches: | Theoretical, Computational, Phenomenological |
Abstract
We study limits from dilepton searches on leptoquark completions to the Stan- dard Model in the parameter space motivated by anomalies in the b → s sector. After a full Run-2 analysis by LHCb, the disparity in lepton flavour universality violation has disappeared. However, the mismatch in angular distributions as well as in Bs → μ+μ− partial width is still unresolved and still implies a possible new physics contribution. We probe three models of leptoquarks — scalar models S3 and R2 as well as vector leptoquark model U1 using non-resonant dilepton searches to place limit on both the mass and couplings to SM fermions. Current limits on lepto- quarks with both non-uniform or uniform coupling to lepton flavours are calculated. Interestingly, if leptoquark couplings to electrons and muons are indeed universal, then the U1 model parameter space that corresponds to the anomalous contribution should already be accessible with Run-2 data in the non-resonant eμ channel. In the non-universal case, there is a significant exclusion in couplings, but not enough to reach regions that explain observed anomalies. We, therefore, examine the prospec- tive sensitivity at the HL-LHC as well as of a 3 TeV future muon collider. For the vector leptoquark model, we find that a muon collider can probe all of the relevant parameter space at 95% confidence with just 1 fb^{-1} data whereas R2 and S3 models can be excluded at 95% with 5 fb^{−1} and 6.5 fb^{−1} luminosity respectively.
Author indications on fulfilling journal expectations
- Provide a novel and synergetic link between different research areas.
- Open a new pathway in an existing or a new research direction, with clear potential for multi-pronged follow-up work
- Detail a groundbreaking theoretical/experimental/computational discovery
- Present a breakthrough on a previously-identified and long-standing research stumbling block