Observation of a B_{c}^{*+} Meson with the ATLAS Detector
Physical review letters, cilt.137, sa.14, ss.141901, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 137 Sayı: 14
- Basım Tarihi: 2026
- Doi Numarası: 10.1103/vrxp-zkbs
- Dergi Adı: Physical review letters
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex, EMBASE, INSPEC, MathSciNet, MEDLINE, zbMATH, DIALNET
- Sayfa Sayıları: ss.141901
- İstanbul Üniversitesi Adresli: Evet
Özet
The first observation of a new meson state decaying into B_{c}^{+} and a photon is presented using a dataset of pp collisions at a center-of-mass energy sqrt[s]=13 TeV collected by the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 140 fb^{-1}. The B_{c}^{+} mesons are reconstructed from a three-muon final state from B_{c}^{+}→J/ψ(μ^{+}μ^{-})μ^{+}ν_{μ}X decays, along with photons reconstructed via conversions to electron-positron pairs in the detector material. The new state is observed with a significance that exceeds 8 standard deviations. The mass difference between the new meson state and the ground-state B_{c}^{+} meson is measured to be 64.5±1.4(stat) _{-1.4}^{+1.0}(syst) MeV. This corresponds to a mass for the observed state of 6339.0±1.4(stat) _{-1.4}^{+1.0}(syst)±0.3(m_{B_{c}^{+}}) MeV, where the last uncertainty is due to the precision of the best knowledge of the B_{c}^{+} meson mass. The low mass difference value matches the theory expectations for the lowest vector state of the b[over ¯]c system, the B_{c}^{*+} meson.