A search for an unexpected asymmetry in the production of $e^+ \mu^-$ and $e^- \mu^+$ pairs in proton-proton collisions recorded by the ATLAS detector at $\sqrt s = 13~\mathrm{TeV}$
| Autor: | ATLAS Collaboration |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
final state [electron muon]
p p: scattering angular distribution: asymmetry neutralino: mass flavor: violation [lepton] mass: lower limit leptoquark: mass neutralino: decay production [smuon] mass [smuon] 2 leptons search for [new physics] scalar [leptoquark] smuon: mass scattering [p p] ratio: upper limit [cross section] asymmetry [production] leptoquark: signature smuon: production production: asymmetry sparticle R parity: violation violation [R parity] BSM search 13 TeV new physics: search for leptoquark: scalar High Energy Physics::Phenomenology lepton: flavor: violation ATLAS decay [neutralino] CERN LHC Coll asymmetry [angular distribution] mass [leptoquark] lower limit [mass] Other new particle searches electron muon: final state RPV SUSY cross section: ratio: upper limit High Energy Physics::Experiment colliding beams [p p] supersymmetry mass [neutralino] p p: colliding beams signature [leptoquark] new particle experimental results |
| DOI: | 10.3204/PUBDB-2021-05312 |
| Popis: | 18 pp. (2021). This search, a type not previously performed at ATLAS, uses a comparison of the production cross sections for $e^+ \mu^-$ and $e^- \mu^+$ pairs to constrain Beyond Standard Model physics processes. It uses $139~\mathrm{fb}^{-1}$ of proton-proton collision data recorded at $\sqrt s = 13~\textrm{TeV}$ at the LHC. Targeting sources of new physics which prefer the opposite $e^\pm\mu^\mp$ combination to the Standard Model, the search contains two broad signal regions which are used to provide model-independent constraints on the ratio of cross sections at the $2\%$ level. It also has two special selections targeting supersymmetric models and leptoquark signatures. Observations using one of these are able to exclude singly-produced smuons with masses up to 640 GeV in a model in which the only other light sparticle is a neutralino, when the $R$-parity violating coupling $\lambda_{231}^{'}$ is close to unity. Observations using the other exclude scalar leptoquarks with masses above 1500 GeV when $g_\textrm{1R}^{eu}=g_\textrm{1R}^{\mu c}>0.6$. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|