Observation of structure in the J/ψ-pair mass spectrum

Observation of structure in the J/ψ-pair mass spectrum

Bibliographic Details
Parent link:	Science Bulletin Vol. 65, iss. 23.— 2020.— [P. 1983-1993]
Corporate Authors:	Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов, Национальный исследовательский Томский политехнический университет Инженерная школа информационных технологий и робототехники Отделение автоматизации и робототехники (ОАР)
Other Authors:	Aaij R. Roel, Beteta C. A. Carlos Abellan, Ackernley T., Eydelman S. I. Semen Isaakovich, Kharisova A. E. Anastasiya Evgenjevna, Panshin G. L. Gennady Leonidovich
Summary:	Title screen Using proton-proton collision data at centre-of-mass energies of s=7,8 and 13TeV recorded by the LHCb experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 9fb-1, the invariant mass spectrum of J/ψ pairs is studied. A narrow structure around 6.9GeV/c2 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 7.4GeV/c2, 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.
Language:	English
Published:	2020
Subjects:	электронный ресурс труды учёных ТПУ QCD exotics tetraquark spectroscopy quarkonium particle and resonance production
Online Access:	http://earchive.tpu.ru/handle/11683/73240 https://doi.org/10.1016/j.scib.2020.08.032
Format:	Electronic Book Chapter
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=666466

Internet

http://earchive.tpu.ru/handle/11683/73240
https://doi.org/10.1016/j.scib.2020.08.032