تقرير
Observation of an excess of di-charmonium events in the four-muon final state with the ATLAS detector
| العنوان: | Observation of an excess of di-charmonium events in the four-muon final state with the ATLAS detector |
|---|---|
| المؤلفون: | ATLAS Collaboration |
| المصدر: | 14 pp. (2022). doi:10.3204/PUBDB-2022-07354 |
| سنة النشر: | 2022 |
| المجموعة: | DESY Publication Database (PUBDB) |
| مصطلحات موضوعية: | p p: colliding beams, mass: width, muon: final state, p p: scattering, resonance: production, numerical calculations: Monte Carlo, charmonium: pair production, J/psi(3100): pair production, J/psi(3100): leptonic decay, tetraquark, CERN LHC Coll, ATLAS, structure, psi(3685): leptonic decay, final state: (4lepton), muon: pair production, hybrid, narrow resonance, background, experimental results, 13000 GeV-cms, Charmonium, BPHYS |
| جغرافية الموضوع: | DE |
| الوصف: | A search for potential $cc\bar{c}\bar{c}$ tetraquarks decaying into a pair of charmonium states in the four muon final state is performed using proton-proton collision data at $\sqrt{s}=13$ TeV, corresponding to an integrated luminosity of 139 fb$^{-1}$ recorded by the ATLAS experiment at the Large Hadron Collider (LHC). Two different decay channels, $T_{cc\bar{c}\bar{c}}\to J/\psi~J/\psi\to 4\mu$ and $T_{cc\bar{c}\bar{c}}\to J/\psi~\psi(2S)\to 4\mu$, are studied. Various backgrounds to the resonance searches are estimated based on a hybrid approach involving both Monte Carlo simulations and data-driven methods. Statistically significant excesses are seen in the di-$J/\psi$ channel consistent with a narrow resonance at 6.9 GeV and a broader structure at lower mass. A statistically significant excess is also seen in the $J/\psi$+$\psi$(2S) channel. The fitted masses and decay widths of the structures are reported. |
| نوع الوثيقة: | report |
| اللغة: | English |
| العلاقة: | https://bib-pubdb1.desy.de/record/486568Test; https://bib-pubdb1.desy.de/search?p=id:%22PUBDB-2022-07354%22Test |
| الإتاحة: | https://doi.org/10.3204/PUBDB-2022-07354Test https://bib-pubdb1.desy.de/record/486568Test https://bib-pubdb1.desy.de/search?p=id:%22PUBDB-2022-07354%22Test |
| حقوق: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.E13888AB |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |