Observation of the ?b1(3P) and ?b2(3P) and Measurement of their Masses
Yükleniyor...
Tarih
2018
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
American Physical Society
Erişim Hakkı
Özet
The ?b1(3P) and ?b2(3P) states are observed through their ?(3S)? decays, using an event sample of proton-proton collisions collected by the CMS experiment at the CERN LHC. The data were collected at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 80.0??fb?1. The ?(3S) mesons are identified through their dimuon decay channel, while the low-energy photons are detected after converting to e+e? pairs in the silicon tracker, leading to a ?b(3P) mass resolution of 2.2 MeV. This is the first time that the J=1 and 2 states are well resolved and their masses individually measured: 10513.42±0.41(stat)±0.18(syst)??MeV and 10524.02±0.57(stat)±0.18(syst)??MeV; they are determined with respect to the world-average value of the ?(3S) mass, which has an uncertainty of 0.5 MeV. The mass splitting is measured to be 10.60±0.64(stat)±0.17(syst)??MeV.
Açıklama
Anahtar Kelimeler
Particle production, Particle decays
Kaynak
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
Sayı
Künye
PHYSICAL REVIEW LETTERS 121, 092002 (2018)
