Observation of an excess of dicharmonium events in the four-muon final state with the ATLAS detector

Küçük Resim Yok

Tarih

2023

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

Amer Physical Soc

Erişim Hakkı

info:eu-repo/semantics/openAccess

Özet

A search is made for potential ccc over bar c over bar tetraquarks decaying into a pair of charmonium states in the four ffiffi muon final state using proton-proton collision data at p s = 13 TeV, corresponding to an integrated luminosity of 140 fb-1 recorded by the ATLAS experiment at LHC. Two decay channels, J lig +J lig -4 mu and J lig + ig(2S) -4 mu, are studied. Backgrounds are estimated based on a hybrid approach involving Monte Carlo simulations and data-driven methods. Statistically significant excesses with respect to backgrounds dominated by the single parton scattering are seen in the di-J lig 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 lig + ig(2S) channel. The fitted masses and decay widths of the structures are reported.

Açıklama

Anahtar Kelimeler

Double-Parton Scatterings, J/PSI-Pair Production

Kaynak

Physical Review Lettres

WoS Q Değeri

Q1

Scopus Q Değeri

Q1

Cilt

131

Sayı

15

Künye

Aad, G., Abbott, B., Abeling, K., Abicht, N. J., Abidi, S. H., Aboulhorma, A., & Abramowicz, H. (2023). Observation of an excess of dicharmonium events in the four-muon final state with the ATLAS detector. Physical review letters.