Observation of the Anomalous Shape of X (1840) in J/? ??3 (?+?-) Indicating a Second Resonance Near p p ¯ Threshold
Küçük Resim Yok
Tarih
2024
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
American Physical Society
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Using a sample of (10087±44)×106 J/? events, which is about 45 times larger than that was previously analyzed, a further investigation on the J/???3(?+?-) decay is performed. A significant distortion at 1.84 GeV/c2 in the line shape of the 3(?+?-) invariant mass spectrum is observed for the first time, which could be resolved by two overlapping resonant structures, X(1840) and X(1880). The new state X(1880) is observed with a statistical significance larger than 10?. The mass and width of X(1880) are determined to be 1882.1±1.7±0.7 MeV/c2 and 30.7±5.5±2.4 MeV, respectively, which indicates the existence of a pp¯ bound state. © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
Açıklama
Anahtar Kelimeler
Atomic Physics, Bound-States, Invariant-Mass Spectra, Lines Shapes, Resonant Structures, Statistical Significance, Mass Spectrometry, Article, Controlled Study, Diagnosis, Human
Kaynak
Physical Review Letters
WoS Q Değeri
Scopus Q Değeri
N/A
Cilt
132
Sayı
15
