Observation of structure in the J/ψ-pair mass spectrum
Name
1-s2.0-S2095927320305685-main.pdf
Description
Published version
Size
1.07 MB
Format
Adobe PDF
Checksum (MD5)
d8e3efc6c73d6b0714f6a3f14454f940
Author(s)
Williams, Michael
Date Issued
December 15, 2020
Journal
Science Bulletin
Publisher
Elsevier BV
Citation
Williams, Michael. 2020. "Observation of structure in the J/ψ-pair mass spectrum." Science Bulletin, 65 (23).
Version
Final published version
Abstract
Using proton-proton collision data at centre-of-mass energies of √s = 7; 8 and 13 TeV recorded by the ffiffi LHCb experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 9 fb , the invariant mass spectrum of J/w pairs is studied. A narrow structure around 6:9 GeV=c matching the lineshape of a resonance and a broad structure just above twice the J/ψ mass are observed. The deviation of the data from nonresonant J/ψ-pair production is above five standard deviations in the mass region between 6:2 and 7:4 GeV=c , covering predicted masses of states composed of four charm quarks. The mass and natural width of the narrow X(6900) structure are measured assuming a Breit-Wigner lineshape. -1 2 2
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1016/j.scib.2020.08.032
