Speaker
Jean-Philippe Lansberg
(IPN Orsay - Paris Sud U. - CNRS/IN2P3)
Description
In this talk, I will focus on the study of associated-quarkonium production in a number of channels at the LHC. First, I will address the case of quarkonium-pair production [1,2,3] which has recently been studied by LHCb [4], CMS [5] and D0 [6,7]. I will argue that the inclusion of Double-Parton Scattering (DPS) and Next-to-Leading Order (NLO) contributions are necessary to account for the existing data. I will then address the case of quarkonium + vector boson [8,9,10] which has recently been studied by ATLAS [11,12].
References:
[1] J/Psi -pair production at large momenta: Indications for double parton scatterings and large alpha_s^5 contributions. By J.P. Lansberg, H.S. Shao. arXiv:1410.8822 [hep-ph]. Phys.Lett. B751 (2015) 479-486.
[2] Production of J/psi+eta(c) vs. J/psi+J/psi at the LHC: Impact of Real alpha_s^5 corrections. By J.P. Lansberg, H.-S. Shao. [arXiv:1308.0474 [hep-ph]]. Phys.Rev.Lett. 111 (2013) 122001.
[3] Double-quarkonium production at a fixed-target experiment at the LHC (AFTER@LHC). By J.P. Lansberg, H.S. Shao. arXiv:1504.06531 [hep-ph]. Nucl.Phys. B900 (2015) 273-294.
[4] Observation of J/psi pair production in pp collisions at sqrt{s}=7 TeV. By LHCb Collaboration. arXiv:1109.0963 [hep-ex]. Phys.Lett. B707 (2012) 52-59.
[5] Measurement of prompt J/psi pair production in pp collisions at sqrt{s} = 7 TeV. By CMS Collaboration. arXiv:1406.0484 [hep-ex]. JHEP 1409 (2014) 094.
[6] Observation and studies of double J/psi production at the Tevatron. By D0 Collaboration. arXiv:1406.2380 [hep-ex]. Phys.Rev. D90 (2014) 11, 111101.
[7] Evidence for simultaneous production of J/psi and Upsilon mesons. By D0 Collaboration. [arXiv:1511.02428 [hep-ex]].
[8] Next-to-leading-order QCD corrections to the yields and polarisations of J/Psi and Upsilon directly produced in association with a Z boson at the LHC. By B. Gong, J.P. Lansberg, C. Lorce, J.X. Wang. [arXiv:1210.2430 [hep-ph]]. JHEP 1303 (2013) 115.
[9] Reassessing the importance of the colour-singlet contributions to direct J/psi + W production at the LHC and the Tevatron. By J.P. Lansberg, C. Lorce. [arXiv:1303.5327 [hep-ph]]. Phys.Lett. B726 (2013) 218-222.
[10] Next-to leading order QCD corrections to quarkonium + vector bosons hadroproduction. J.P. Lansberg, H.S. Shao, L.P. Sun (work in progress).
[11] Observation and measurements of the production of prompt and non-prompt J/psi mesons in association with a Z boson in pp collisions at sqrt{s} = 8 TeV with the ATLAS detector. By ATLAS Collaboration. arXiv:1412.6428 [hep-ex]. Eur.Phys.J. C75 (2015) 5, 229.
[12] Measurement of the production cross section of prompt J/psi mesons in association with a W^+/- boson in pp collisions at sqrt{s} = 7 TeV with the ATLAS detector. By ATLAS Collaboration. arXiv:1401.2831 [hep-ex]. JHEP 1404 (2014) 172.
Primary author
Jean-Philippe Lansberg
(IPN Orsay - Paris Sud U. - CNRS/IN2P3)
