Observation and studies of double J/psi production at the Tevatron

0440237 - FZÚ 2015 RIV US eng J - Článek v odborném periodiku
Abazov, V. M. - Abbott, B. - Acharya, B.S. - Kupčo, Alexander - Lokajíček, Miloš … celkem 364 autorů
Observation and studies of double J/psi production at the Tevatron.
Physical Review D: Particles, Fields, Gravitation and Cosmology. Roč. 90, č. 11 (2014), "111101-1"-"111101-8". ISSN 1550-7998
Grant CEP: GA MŠMT(CZ) LG12006
Institucionální podpora: RVO:68378271
Klíčová slova: Batavia TEVATRON Coll * parton * density * nucleon * model * anti-p p * inclusive reaction
Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
Impakt faktor: 4.643, rok: 2014

We present the observation of doubly-produced J/ψ mesons with the D0 detector at Fermilab in pp¯ collisions at s√=1.96 TeV. The production cross section for both singly and doubly-produced J/ψ mesons is measured using a sample with an integrated luminosity of 8.1fb−1. For the first time, the double J/ψ production cross section is separated into contributions due to single and double parton scatterings. Using these measurements, we determine the effective cross section σeff, a parameter characterizing an effective spatial area of the parton-parton interactions and related to the parton spatial density inside the nucleon.
Trvalý link: http://hdl.handle.net/11104/0243347