TY  - JOUR
AU  - ATLAS Collaboration (Aad, G. et al
AU  - Cabrera Urban, S.
AU  - Castillo Gimenez, V.
AU  - Costa, M. J.
AU  - Fernandez Martinez, P.
AU  - Ferrer, A.
AU  - Fiorini, L.
AU  - Fuster, J.
AU  - Garcia, C.
AU  - Garcia Navarro, J. E.
AU  - Gonzalez de la Hoz, S.
AU  - Hernandez Jimenez, Y.
AU  - Higon-Rodriguez, E.
AU  - Irles Quiles, A.
AU  - Jimenez Pena, J.
AU  - Kaci, M.
AU  - King, M.
AU  - Lacasta, C.
AU  - Lacuesta, V. R.
AU  - Marti-Garcia, S.
AU  - Mitsou, V. A.
AU  - Moles-Valls, R.
AU  - Oliver Garcia, E.
AU  - Pedraza Lopez, S.
AU  - Perez Garcia-Estañ, M. T.
AU  - Romero Adam, E.
AU  - Ros, E.
AU  - Salt, J.
AU  - Sanchez Martinez, V.
AU  - Soldevila, U.
AU  - Sanchez, J.
AU  - Torro Pastor, E.
AU  - Valero, A.
AU  - Valladolid Gallego, E.
AU  - Valls Ferrer, J. A.
AU  - Vos, M.
PY  - 2015
DA  - 2015//
TI  - Observation and measurements of the production of prompt and non-prompt J/psi mesons in association with a Z boson in pp collisions at root s=8 TeV with the ATLAS detector
T2  - Eur. Phys. J. C
JO  - European Physical Journal C
SP  - 229
EP  - 29pp
VL  - 75
IS  - 5
PB  - Springer
AB  - The production of a Z boson in association with a J/psi meson in proton-proton collisions probes the production mechanisms 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 theATLAS experiment at the LHC in pp collisions at root s = 8 TeV, the first measurement of associated Z + J/psi production is presented for both prompt and non-prompt J/psi production, with both signatures having a significance in excess of 5 sigma. The inclusive production cross-sections for Z boson production (analysed in mu(+) mu(-) or e(+) e(-) decay modes) in association with prompt and non-prompt J/psi (-> mu(+) mu(-)) are measured relative to the inclusive production rate of Z bosons in the same fiducial volume to be (36.8 +/- 6.7 +/- 2.5) x 10(-7) and (65.8 +/- 9.2 +/- 4.2) x 10(-7) respectively. Normalised differential production cross-section ratios are also determined as a function of the J/psi 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.
SN  - 1434-6044
UR  - http://arxiv.org/abs/1412.6428
UR  - https://doi.org/10.1140/epjc/s10052-015-3406-9
DO  - 10.1140/epjc/s10052-015-3406-9
LA  - English
N1  - WOS:000355680900005
ID  - ATLASCollaborationAad_etal2015
ER  -