Journal
| Title | Measurement of η_c (1S) production cross-sections in pp collisions at âs = 13 TeV Posted by Jan Mickelle Maratas |
| Authors | LHCb collaboration (R. Aaij, et al.) |
| Publication date | 2020/3/2 |
| Journal | European Physical Journal C |
| Volume | 80 |
| Issue | 3 |
| Pages | 191 |
| Publisher | Springer |
| Abstract | Using a data sample corresponding to an integrated luminosity of 2.0 fbâ1, collected by the LHCb experiment, the production of the ηc(1S) state in protonâproton collisions at a centre-of-mass energy of sâ=13 TeV is studied in the rapidity range 2.0<y<4.5 and in the transverse momentum range 6.5<pT<14.0GeV. The cross-section for prompt production of ηc(1S) mesons relative to that of the J/Ï meson is measured using the p p¯¯¯ decay mode and is found to be Ïηc(1S)/ÏJ/Ï=1.69±0.15±0.10±0.18. The quoted uncertainties are, in order, statistical, systematic and due to uncertainties on the branching fractions of the J/Ïâpp¯¯¯ and ηcâpp¯¯¯ decays. The prompt ηc(1S) production cross-section is determined to be Ïηc(1S)=1.26±0.11±0.08±0.14μb, where the last uncertainty includes that on the J/Ï meson cross-section. The ratio of the branching fractions of b-hadron decays to the ηc(1S) and J/Ï states is measured to be BbâηcX/BbâJ/ÏX=0.48±0.03±0.03±0.05, where the last uncertainty is due to those on the branching fractions of the J/Ïâpp¯¯¯ and ηcâpp¯¯¯ decays. The difference between the J/Ï and ηc(1S) masses is also determined to be 113.0±0.7±0.1MeV, which is the most precise single measurement of this quantity to date. |
| DOI | https://doi.org/10.1140/epjc/s10052-020-7733-0 |
| URL | https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-020-7733-0 |