Publication
Measurement of prompt $J/\psi$ pair production in pp collisions at $ \sqrt{s} $ = 7 Tev
| dc.contributor.author | CMS collaboration (2129 authors) | |
| dc.contributor.author | Hollar, Jonathan | |
| dc.contributor.author | Nayak, Aruna | |
| dc.contributor.author | Bargassa, Pedrame | |
| dc.contributor.author | Beirão Da Cruz E Silva, Cristóvão | |
| dc.contributor.author | Faccioli, Pietro | |
| dc.contributor.author | Ferreira Parracho, Pedro Guilherme | |
| dc.contributor.author | Gallinaro, Michele | |
| dc.contributor.author | Nguyen, Federico | |
| dc.contributor.author | Rodrigues Antunes, Joao | |
| dc.contributor.author | Seixas, Joao | |
| dc.contributor.author | Varela, Joao | |
| dc.contributor.author | Vischia, Pietro | |
| dc.contributor.author | Lloret Iglesias, Lara | |
| dc.contributor.author | David Tinoco Mendes, Andre | |
| dc.contributor.author | Musella, Pasquale | |
| dc.contributor.author | Silva, Pedro | |
| dc.contributor.author | Pela, Joao | |
| dc.contributor.author | Leonardo, Nuno | |
| dc.date.accessioned | 2019-02-04T03:40:56Z | |
| dc.date.available | 2019-02-04T03:40:56Z | |
| dc.date.issued | 2014-09-17 | |
| dc.date.updated | 2019-02-04T03:40:56Z | |
| dc.description.abstract | Production of prompt J/ψ meson pairs in proton-proton collisions at $ \sqrt{s} $ = 7 TeV is measured with the CMS experiment at the LHC in a data sample corresponding to an integrated luminosity of about 4.7 fb$^{−1}$. The two J/ψ mesons are fully reconstructed via their decays into μ$^{+}$ μ$^{−}$ pairs. This observation provides for the first time access to the high-transverse-momentum region of J/ψ pair production where model predictions are not yet established. The total and differential cross sections are measured in a phase space defined by the individual J/ψ transverse momentum (p$_{T}^{J/}^{ψ}$) and rapidity (|y$^{J/}^{ψ}$ |): |y$^{J/}^{ψ}$ | < 1.2 for p$_{T}^{J/}^{ψ}$ > 6.5 GeV/c, 1.2 < |y$^{J/}^{ψ}$ | < 1.43 for a p$_{T}$ threshold that scales linearly with |y$^{J/}^{ψ}$ | from 6.5 to 4.5 GeV/c, and 1.43 < |y$^{J/}^{ψ}$ | < 2.2 for p$_{T}^{J/}^{ψ}$ > 4.5 GeV/c. The total cross section, assuming unpolarized prompt J/ψ pair production is 1.49 ± 0.07 (stat) ±0.13 (syst) nb. Different assumptions about the J/ψ polarization imply modifications to the cross section ranging from −31% to +27%. | |
| dc.description.version | Peer Reviewed | |
| dc.identifier | JHEP 1409 (2014) 094; DOI 10.1007/JHEP09(2014)094 | |
| dc.identifier.uri | http://dx.doi.org/10.1007/JHEP09(2014)094 | |
| dc.identifier.uri | http://hdl.handle.net/10400.26/26607 | |
| dc.language.iso | eng | |
| dc.title | Measurement of prompt $J/\psi$ pair production in pp collisions at $ \sqrt{s} $ = 7 Tev | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| rcaap.rights | openAccess | pt |
| rcaap.type | article |