Measurement of exclusive ϒ photoproduction from protons in pPb collisions at √sNN = 5.02 TeV
The exclusive photoproduction of ϒ(nS) meson states from protons, γ p → ϒ(nS) p (with n = 1, 2, 3), is studied in ultraperipheral pPb collisions at a centre-of-mass energy per nucleon pair of √ sNN = 5.02 TeV. The measurement is performed using the ϒ(nS) → μ + μ − decay mode, with data collected by...
| Authors: | , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2019 |
| Country: | Brasil |
| Institution: | Universidade Federal do Rio Grande do Sul (UFRGS) |
| Repository: | Repositório Institucional da UFRGS |
| Language: | English |
| OAI Identifier: | oai:www.lume.ufrgs.br:10183/196322 |
| Online Access: | http://hdl.handle.net/10183/196322 |
| Access Level: | Open access |
| Keyword: | Aceleradores de partículas Colisao de ions pesados Fotoproducao de mesons |
| Summary: | The exclusive photoproduction of ϒ(nS) meson states from protons, γ p → ϒ(nS) p (with n = 1, 2, 3), is studied in ultraperipheral pPb collisions at a centre-of-mass energy per nucleon pair of √ sNN = 5.02 TeV. The measurement is performed using the ϒ(nS) → μ + μ − decay mode, with data collected by the CMS experiment corresponding to an integrated luminosity of 32.6 nb−1. Differential cross sections as functions of the ϒ(nS) transverse momentum squared p2T , and rapidity y, are presented. The ϒ(1S) photoproduction cross section is extracted in the rapidity range |y| < 2.2, which corresponds to photon–proton centre-ofmass energies in the range 91 < Wγ p < 826 GeV. The data are compared to theoretical predictions based on perturbative quantum chromodynamics and to previous measurements. |
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