TY  - SER
AU  - Aad,G.
AU  - Abdallah,J.
AU  - Chelkov,G.A.
AU  - Abbott,B.
ED  - Томский государственный университет
TI  - Observation and measurements of the production of prompt and non-prompt J/ψ mesons in association with a Z boson in pp collisions at √s = 8 TeV with the ATLAS detector
KW  - ATLAS, детектор
KW  - Большой адронный коллайдер
KW  - столкновение частиц
KW  - бозоны
KW  - статьи в журналах
N1  - Библиогр.: 86 назв
N2  - The production of a Z boson in association with a J/ψ meson in proton–proton collisions probes the productionmechanisms of quarkonium and heavy flavour in association with vector bosons, and allows studies of multiple parton scattering. Using 20.3 fb−1 of data collected with the ATLAS experiment at the LHC in pp collisions at √s = 8 TeV, the first measurement of associated Z + J/ψ production is presented for both prompt and non-prompt J/ψ production, with both signatures having a significance in excess of 5σ. The inclusive production cross-sections for Z boson production (analysed inμ+μ− or e+e− decay modes) in association with prompt and non-prompt J/ψ(→ μ+μ−) are measured relative to the inclusive production rate of Z bosons in the same fiducial volume to be (36.8 ± 6.7 ± 2.5) × 10−7 and (65.8 ± 9.2 ± 4.2) × 10−7 respectively. Normalised differential production cross-section ratios are also determined as a function of the J/ψ transverse momentum. The fraction of signal events arising from single and double parton scattering is estimated, and a lower limit of 5.3 (3.7) mb at 68 (95)% confidence level is placed on the effective cross-section regulating double parton interactions
UR  - http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000525477
ER  -