Measurement of the J/ψ pair production cross-section in pp collisions at s√=13TeV

• Published in: The journal of high energy physics no. 2017
• Main Authors: Aaij, R., Beaucourt, L., Chefdeville, M., Decamp, D., Déléage, N., Ghez, P., Marchand, J.-F., Minard, M.-N., Pietrzyk, B., t'Jampens, S., Tisserand, V., Tournefier, E., Arnau Romeu, J., Aslanides, E., Cogan, J., Bruyn, K. De, Legac, R., Leroy, O., Mancinelli, G., Martin, M., Mordà, A., Serrano, J., Tayduganov, A., Tsaregorodtsev, A., Ajaltouni, Z.J., Baalouch, M., Cogneras, E., Deschamps, O., Gazzoni, G., Hadjivasiliou, C., Henrard, P., Kozeiha, M., Lefèvre, R., Maratas, J., Monteil, S., Perret, P., Vernet, M.
• Format: Journal Article
• Language: English
• Published: Springer Verlag (Germany) 10-10-2017
• Subjects: High Energy Physics - Experiment; Physics
• ISSN: 1029-8479
• DOI: 10.1007/JHEP06(2017)04710.1007/JHEP10(2017)068

The production cross-section of J/ψ pairs is measured using a data sample of pp collisions collected by the LHCb experiment at a centre-of-mass energy of s√=13TeV, corresponding to an integrated luminosity of 279±11pb−1. The measurement is performed for J/ψ mesons with a transverse momentum of less than 10GeV/c in the rapidity range 2.0<y<4.5. The production cross-section is measured to be 13.5±0.9±0.8nb. The first uncertainty is statistical, and the second is systematic. The differential cross-sections as functions of several kinematic variables of the J/ψ pair are measured and compared to theoretical predictions.